Entity_Type:
Entity_Type_Label: geology_LASS_sampleSummary_westernAKRange_AK_todd.csv
Entity_Type_Definition:
Table with sample information, including location, rock descriptions, hafnium isotope data, median trace element concentrations, and geochronology analysis summary data. This table contains 109 records and is presented in comma separated value (.csv) format.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: Index
Attribute_Definition:
Numeric identifier used for sorting purposes within this table only.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 109
Attribute:
Attribute_Label: Sample
Attribute_Definition: Sample number as collected in the field; USGS identifier.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Sample identifier; most labels consisting of the last two digits of the year collected, an abbreviation identifying the collector, and a number and possible suffix. Sample identifiers link to field Sample in table "geology_LASS_geochronologyData_westernAKRange_AK_todd.csv".
Attribute:
Attribute_Label: LONGITUDE
Attribute_Definition: Sample location longitude in decimal degrees.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -154.4630
Range_Domain_Maximum: -150.6214
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.0001
Attribute:
Attribute_Label: LATITUDE
Attribute_Definition: Sample location latitude in decimal degrees.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 61.0029
Range_Domain_Maximum: 62.7936
Attribute_Units_of_Measure: decimal degrees
Attribute_Measurement_Resolution: 0.0001
Attribute:
Attribute_Label: DATUM
Attribute_Definition: Geodetic model used for sample location; NAD83 or WGS1984.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: NAD83
Enumerated_Domain_Value_Definition:
North American Datum of 1983; semi-major axis = 6378137.0 and flattening ratio denominator = 298.257222101
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: WGS84
Enumerated_Domain_Value_Definition:
World Geodetic System 1984; semi-major axis = 6378137.0 m and flattening ratio = 298.257223563
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: SERIES
Attribute_Definition:
Magmatic series assumed for sample; geochronological groupings based on discussion in Jones et al. (2021) and expanded on by Todd et al. (in prep.).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: TR
Enumerated_Domain_Value_Definition: Rock associated with Triassic magmatism
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: ELC
Enumerated_Domain_Value_Definition: Rock associated with early Late-Cretaceous magmatism
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MLC
Enumerated_Domain_Value_Definition: Rock associated with middle Late-Cretaceous magmatism
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: LC
Enumerated_Domain_Value_Definition: Rock associated with Late-Cretaceous magmatism
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: E
Enumerated_Domain_Value_Definition: Rock associated with Eocene magmatism
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: EO
Enumerated_Domain_Value_Definition: Rock associated with Oligocene magmatism
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: P
Enumerated_Domain_Value_Definition: Rock associated with Paleocene magmatism
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: ROCK_CLASS
Attribute_Definition: Rock type (Igneous, metamorphic, or sedimentary).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Igneous
Enumerated_Domain_Value_Definition: Primary rock classification = Igneous
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: ROCK_NAME
Attribute_Definition: Rock name, as described in original collector field notes.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain: Sample rock nomenclature.
Attribute:
Attribute_Label: ROCK_COMMENT
Attribute_Definition: A more detailed rock description.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
This free text field contains a more descriptive rock description than 'ROCK_NAME'.
Attribute:
Attribute_Label: UPb_Age_Interpretation
Attribute_Definition:
Interpretation whether an analyzed grain represents the main crystallization stage of the host rock, or "inheritance" (xenocrystic) from a different source.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Crystallization age
Enumerated_Domain_Value_Definition:
Analyzed grain represents the main crystallization stage of the host rock.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Mount
Attribute_Definition:
Internal laboratory alphanumeric identifier for a specific sample mount.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this field consist of three letter initials followed by a two-digit number, denoting a specific and repeatable laboratory equipment configuration.
Attribute:
Attribute_Label: Session_Run
Attribute_Definition:
Year and month of analytical session, and Run sequence within that session, when analysis was conducted.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this data set are a concatenation of the calendar year followed by a "/", the number associated with the calendar month, a two-digit number indicating the procedural sequence during the month indicated, the word "_RUN_", and a two-digit number. Multiple runs are indicated in certain cells.
Attribute:
Attribute_Label: Spot_Size_um
Attribute_Definition: Laser spot size during analyses, in micrometers (um).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this field are concatenated numeric spot analysis sizes from the instrument in micrometers and the suffix 'um". Some samples were run with more than once with more than one spot size, as indicated.
Attribute:
Attribute_Label: Laser_Run_Conditions
Attribute_Definition:
Laser run conditions during analysis; repetition rate (Hz), fluence (%) and Output (mJ).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The attributes in this field are a concatenation of the frequency of the laser in Hz (cycles per second), power setting of the laser in % (percent), and output power setting of the laser in mJ (milliJoules). Additional comments are included if multiple settings or analytical sessions were used.
Attribute:
Attribute_Label: Comment_age
Attribute_Definition: Comments on sample age or analytical observations.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The values in this data set include specific additional or amplifying remarks regarding the type of analysis or procedures. This is a free text field.
Attribute:
Attribute_Label: Comment_chem
Attribute_Definition:
Comments on sample trace elements or hafnium isotope observations. Blank cells may be present, indicating that no additional chemistry observations were made as a result of the procedures completed.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The values in this data set include general observations regarding procedural results. This is a free text field.
Attribute:
Attribute_Label: Spots_total
Attribute_Definition:
Total number of zircon measurements made for a sample population.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 56
Attribute:
Attribute_Label: Method
Attribute_Definition:
Analytical configuration used; "LASS," short for laser-ablation split-stream, indicates simultaneous quadrupole inductively coupled plasma spectrometer (Q-ICPMS) and multi-collector inductively coupled plasma spectrometer (LA-MC-ICP-MS) analyses, measuring U-Th-Pb and trace elements on Q-ICPMS and Hf isotopes on MC-ICP-MS. "LA-ICP-MS" indicates Hf isotopes on MC-ICP-MS only. For samples with LA-MC-ICP-MS Hf isotope analyses only, ages and TE concentrations shown are measured by SHRIMP ["LA-MC-ICPMS (+SHRIMP)"], from published sources detailed in Supplement.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: LASS
Enumerated_Domain_Value_Definition: Laser-ablation split-stream analytical configuration was used.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: LASS & LA-MC-ICPMS
Enumerated_Domain_Value_Definition:
Both laser-ablation split-stream and laser-ablation multi collector inductively coupled plasma mass spectrometry analytical configurations were used.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: LA-MC-ICPMS (+SHRIMP)
Enumerated_Domain_Value_Definition:
Both laser-ablation multi collector inductively coupled plasma mass spectrometry and sensitive high-resolution ion microprobe analytical configurations were used.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: LASS & LA-MC-ICPMS (+SHRIMP)
Enumerated_Domain_Value_Definition:
A combination of laser-ablation split-stream, laser-ablation multi collector inductively coupled plasma mass spectrometry, and sensitive high-resolution ion microprobe analytical configurations were used.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: UPb_MEAS_USED
Attribute_Definition:
Number of zircon measurements per sample, out of the permissible measurements (i.e., total analyzed minus excluded), contributing to calculation of weighted means of U-Pb ages. "SHRIMP" indicates age shown is the published weighted mean age, from sources detailed in Supplement.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Attributes for this data set are 'SHRIMP', 'single grain', and a series of results in the format 'X of Y', where 'X' indicates number of measurements used and 'Y' indicates the number of measurements permitted.
Attribute:
Attribute_Label: Hf_MEAS_USED
Attribute_Definition:
Number of zircon measurements per sample, out of the permissible measurements (i.e., total analyzed minus excluded), contributing to calculation of weighted means of Hafnium isotopes
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Attributes for this data set are 'single grain' and a series of results in the format 'X of Y', where 'X' indicates number of measurements used and 'Y' indicates the number of measurements permitted.
Attribute:
Attribute_Label: TE_MEAS_USED
Attribute_Definition:
Number of zircon measurements per sample, out of the permissible measurements (i.e., total analyzed minus excluded), contributing to calculation of medians of trace element compositions. "SHRIMP" indicates compositions shown are the median of published values, from sources detailed in Supplement.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Attributes for this data set are 'SHRIMP', 'single grain', and a series of results in the format 'X of Y', where 'X' indicates number of measurements used and 'Y' indicates the number of measurements permitted.
Attribute:
Attribute_Label: Age_Type
Attribute_Definition:
Method used to calculate the values for each individual analysis that yielded a valid result. "age7corr" indicates a 207Pb-corrected 206Pb/238U age (Ma), for U-Pb ages < 1.4Ga; "SHRIMP" indicates 207Pb/206Pb age (Ma) for U-Pb ages >1.4Ga.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain: The only values for this data set are 'SHRIMP' and 'age7corr'.
Attribute:
Attribute_Label: w_mean_age_Ma
Attribute_Definition: Weighted mean of 207Pb-corrected 206Pb/238U ages (Ma)
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 26.7
Range_Domain_Maximum: 441.4
Attribute_Units_of_Measure: Mega-annum, or millions of years before present
Attribute:
Attribute_Label: w_mean_age_Ma_2sigma
Attribute_Definition:
2-sigma (uncertainty) in the weighted mean of 207Pb-corrected 206Pb/238U ages (Ma). Long-term instrument reproducibility is typically higher than analytical uncertainty, approximately 2% of the age.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.2
Range_Domain_Maximum: 55.2
Attribute_Units_of_Measure: Mega-annum, or millions of years before present
Attribute:
Attribute_Label: MSWD
Attribute_Definition:
Mean square weighted deviation of ages; blank cells are present to indicate either single grains or published SHRIMP ages.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.14
Range_Domain_Maximum: 7.94
Attribute:
Attribute_Label: 176Hf_177Hf_ratio
Attribute_Definition: The ratio of 176Hf to 177Hf.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.282623
Range_Domain_Maximum: 0.283110
Attribute:
Attribute_Label: 176Hf_177Hf_ratio_2sigma
Attribute_Definition: 2-sigma (uncertainty) values for the ratio of 176Hf to 177Hf.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.000010
Range_Domain_Maximum: 0.000130
Attribute:
Attribute_Label: 176Lu_177Hf_ratio
Attribute_Definition: The weighted mean ratio of 176Lu to 177Hf.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.000252
Range_Domain_Maximum: 0.006616
Attribute:
Attribute_Label: 176Lu_177Hf_ratio_2sigma
Attribute_Definition:
2-sigma (uncertainty) values for the weighted mean ratio of 176Lu to 177Hf
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.000001
Range_Domain_Maximum: 0.001279
Attribute:
Attribute_Label: eHf
Attribute_Definition:
Epsilon Hf value, assuming a chondritic 176Hf/177Hf value of 0.282772 (Blichert-Toft and Albarede, 1997).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -5.27
Range_Domain_Maximum: 11.95
Attribute:
Attribute_Label: eHf_2sigma
Attribute_Definition:
2-sigma (uncertainty) values for epsilon Hf value, assuming a chondritic 176Hf/177Hf value of 0.282772 (Blichert-Toft and Albarede, 1997).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.35
Range_Domain_Maximum: 4.60
Attribute:
Attribute_Label: 176Hf_177Hf_T
Attribute_Definition:
Age-corrected 176Hf/177Hf ratio, assuming Lutetium-176 decay constant of 1.86x10e-11 (Scherer et al., 2001).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.282614
Range_Domain_Maximum: 0.283108
Attribute:
Attribute_Label: eHf_T
Attribute_Definition:
Age-corrected epsilon Hf value assuming chondritic 176Hf/177Hf ratio of 0.282772 and 176Lu/177Hf ratio of 0.0332 (Blichert-Toft and Albarede, 1997).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -3.86
Range_Domain_Maximum: 13.64
Attribute:
Attribute_Label: T_DM_Hf
Attribute_Definition:
Model age in billions of years before present (Ga) assuming a present-day depleted mantle 176Lu/177Hf and 176Hf/177Hf of 0.0384 and 0.28325 (Griffin et al., 2000).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.20
Range_Domain_Maximum: 0.93
Attribute_Units_of_Measure: (Ga) Giga-annum, or billions of years before present
Attribute:
Attribute_Label: m_Zr_ppm
Attribute_Definition:
Median zirconium (Zr) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.80E+05
Range_Domain_Maximum: 4.87E+05
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Si_ppm
Attribute_Definition:
Median silica (Si) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.37E+05
Range_Domain_Maximum: 1.99E+05
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_P_ppm
Attribute_Definition:
Median phosphorous (P) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 77.6
Range_Domain_Maximum: 737.5
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Ti_ppm
Attribute_Definition: Median titanium (Ti) concentration, in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.39
Range_Domain_Maximum: 36.18
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_V_ppm
Attribute_Definition:
Median vanadium (V) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.96
Range_Domain_Maximum: 0.96
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Sr_ppm
Attribute_Definition:
Median strontium (Sr) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.26
Range_Domain_Maximum: 0.26
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Y_ppm
Attribute_Definition: Median yttrium (Y) concentration, in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 329
Range_Domain_Maximum: 8100
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Nb_ppm
Attribute_Definition:
Median niobium (Nb) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.38
Range_Domain_Maximum: 121.50
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_La_ppm
Attribute_Definition:
Median lanthanum (La) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.001
Range_Domain_Maximum: 7.700
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Ce_ppm
Attribute_Definition: Median cerium (Ce) concentration, in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.4
Range_Domain_Maximum: 81.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Pr_ppm
Attribute_Definition:
Median praseodymium (Pr) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.04
Range_Domain_Maximum: 2.24
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Nd_ppm
Attribute_Definition:
Median neodymium (Nd) concentration, in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.1
Range_Domain_Maximum: 13.6
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Sm_ppm
Attribute_Definition:
Median samarium (Sm) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.4
Range_Domain_Maximum: 19.6
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Eu_ppm
Attribute_Definition: Median europium (Eu) concentration, in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.04
Range_Domain_Maximum: 4.88
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Gd_ppm
Attribute_Definition:
Median gadolinium (Gd) concentration, in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 5.0
Range_Domain_Maximum: 164.4
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Tb_ppm
Attribute_Definition:
Median terbium (Tb) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.6
Range_Domain_Maximum: 65.5
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Dy_ppm
Attribute_Definition:
Median dysprosium (Dy) concentration, in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 29.2
Range_Domain_Maximum: 844.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Ho_ppm
Attribute_Definition:
Median holmium (Ho) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 12.9
Range_Domain_Maximum: 298.7
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Er_ppm
Attribute_Definition: Median erbium (Er) concentration, in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 63
Range_Domain_Maximum: 1500
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Tm_ppm
Attribute_Definition:
Median thulium (Tm) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 16.9
Range_Domain_Maximum: 265.3
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Yb_ppm
Attribute_Definition:
Median ytterbium (Yb) concentration, in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 137
Range_Domain_Maximum: 2620
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Lu_ppm
Attribute_Definition:
Median lutetium (Lu) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 33.2
Range_Domain_Maximum: 9253.3
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Hf_ppm
Attribute_Definition: Median hafnium (Hf) concentration, in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 5663
Range_Domain_Maximum: 15068
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Ta_ppm
Attribute_Definition:
Median tantalum (Ta) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.407
Range_Domain_Maximum: 60.600
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Pb_ppm
Attribute_Definition:
Median lead (Pb) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 5.6
Range_Domain_Maximum: 81.4
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_Th_ppm
Attribute_Definition: Median thorium (Th) concentration, in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 26.7
Range_Domain_Maximum: 3680
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: m_U_ppm
Attribute_Definition: Median uranium (U) concentration, in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 59
Range_Domain_Maximum: 12100
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: T_C
Attribute_Definition:
Ti-in-zircon thermometer (degrees C), after Ferry and Watson (2007), calculated using median Ti concentrations and assuming SiO2 and TiO2 of 0.7
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 614
Range_Domain_Maximum: 929
Attribute_Units_of_Measure: degrees Celsius
Entity_Type:
Entity_Type_Label: geology_LASS_Data_WesternAKRange_AK_Todd.csv
Entity_Type_Definition:
Table with zircon LASS data, reporting the isotropic concentration of uranium (U) and thorium (Th) measured in individual grains, isotopic ratios of lead and uranium, and the age of each grain interpreted from the isotopic ratios. This table also reports hafnium isotope and concentrations of selected trace elements measured in the same grains. This table contains 2,391 records and is presented in comma separated value (.csv) format.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: Index
Attribute_Definition:
Numeric identifier used for sorting purposes within this table only.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 3041
Attribute:
Attribute_Label: Sample
Attribute_Definition: Sample number as collected in the field; USGS identifier.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Sample identifier; most labels consisting of the last two digits of the year collected, an abbreviation identifying the collector, and a number and possible suffix. Corresponds to 'Sample' field in table "geology_LASS_sampleSummary_westernAKRange_AK_todd.csv" included with this data package.
Attribute:
Attribute_Label: Mount
Attribute_Definition:
Internal laboratory alphanumeric identifier for a specific sample mount.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this field consist of three letter initials followed by a two-digit number, denoting a specific and repeatable laboratory equipment configuration.
Attribute:
Attribute_Label: Session_Run
Attribute_Definition:
Year and month of analytical session, and Run sequence within that session, when analysis was conducted.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Values in this data set are a concatenation of the calendar year followed by a "/", the number associated with the calendar month, a two-digit number indicating the procedural sequence during the month indicated, the word "_RUN_", and a two-digit number. Multiple runs are indicated in certain cells.
Attribute:
Attribute_Label: Timestamp
Attribute_Definition:
Concatenation of date and time of analysis for individual analysis spot.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2014-08-11/ 13:20:41
Range_Domain_Maximum: 2022-09-23/ 15:22:56
Attribute_Units_of_Measure: Date Time (YYYY-MM-DD/ hh:mm:ss) local time
Attribute:
Attribute_Label: Spot_ID
Attribute_Definition:
Internal ID number of individual analysis location, generally the sample name or other laboratory identifier followed by a number for each individual grain.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The values in this data set are a concatenation of parts of the field 'Sample' or other laboratory identifier, a dash or underscore, and a number indicating a unique location during the procedure.
Attribute:
Attribute_Label: Spot_Size_um
Attribute_Definition: Laser spot size during analyses, in micrometers (um).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 40
Range_Domain_Maximum: 65
Attribute_Units_of_Measure: (um) micrometers
Attribute:
Attribute_Label: Laser_Run_Conditions
Attribute_Definition:
Laser run conditions during analysis; repetition rate (Hz), fluence (%) and output (mJ).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The attributes in this field are a concatenation of the frequency of the laser in Hz (cycles per second), power setting of the laser in % (percent), and output power setting of the laser in mJ (milliJoules).
Attribute:
Attribute_Label: Method
Attribute_Definition:
Analytical configuration used; "LASS" short for laser-ablation split-stream, indicates simultaneous quadrupole inductively coupled plasma spectrometer (Q-ICPMS) and multi-collector inductively coupled plasma spectrometer (MC-ICP-MS) analyses, measuring U-Th-Pb and trace elements on Q-ICPMS and Hf isotopes on MC-ICP-MS. "LA-ICP-MS" indicates Hf isotopes on MC-ICP-MS only.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: LASS
Enumerated_Domain_Value_Definition: Laser-ablation split-stream analytical configuration
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: LA-ICP-MS
Enumerated_Domain_Value_Definition:
Laser-ablation inductively coupled plasma spectrometer analytical configuration
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: LA-MC-ICPMS (+SHRIMP)
Enumerated_Domain_Value_Definition:
Both laser-ablation multi collector inductively coupled plasma mass spectrometry and sensitive high-resolution ion microprobe analytical configurations were used.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: U_Pb_x_from_wtmn
Attribute_Definition:
Grains with discordant ages (generally <0.80 or >1.05 concordance; tolerances adjusted to <0.70 and >1.10 for smallest sample populations), calculated analytical age uncertainty in excess of 5%, or U/Th ratios indicating metamorphic origin, or grains interpreted as inherited, that are omitted from calculated weighted mean ages. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Blank cells
Enumerated_Domain_Value_Definition: Grain was not omitted from calculation.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: X
Enumerated_Domain_Value_Definition: Value indicates a grain was omitted from calculations.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Hf_x_from_wtmn
Attribute_Definition:
Grains omitted from calculation of Hf isotope characterization for zircon populations. These include all grains excluded from calculated weighted mean ages, plus those with uncertainty in excess of 5%, or obvious outliers, the latter of which are typically associated with particularly small grain to spot size ratios. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Blank cells
Enumerated_Domain_Value_Definition: Grain was not omitted from calculation.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: X
Enumerated_Domain_Value_Definition: Value indicates a grain was omitted from calculations.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: TE_x_from_median
Attribute_Definition:
Grains omitted from calculation of median trace element composition for zircon populations. These include all grains excluded from weighted mean and Hf isotopes, and zircon grains suspected of containing inclusions imparting non-zircon signal on integration of measured trace elements. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Blank cells
Enumerated_Domain_Value_Definition: Grain was not omitted from calculation.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: X
Enumerated_Domain_Value_Definition: Value indicates a grain was omitted from calculations.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Comment_exclude
Attribute_Definition:
Shorthand description for why a grain was considered not permissible for deriving representative values for any one of the three datasets (U/Pb age, Hf isotope, trace elements); for more details see the document: "Supplemental_Info_Analytical_Methods_UCSB_LASS.pdf", included in this data package. "eHf" refers to calculated epsilon Hf value. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
The values in this data set are general remarks denoting rationale for exclusion.
Attribute:
Attribute_Label: U_ppm
Attribute_Definition:
The concentration of uranium (U), in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 22
Range_Domain_Maximum: 71000
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Th_ppm
Attribute_Definition:
The concentration of thorium (Th), in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 9
Range_Domain_Maximum: 45900
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: 207Pb_235U_ratio
Attribute_Definition: The ratio of 207Pb to 235U. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.02620
Range_Domain_Maximum: 6.60000
Attribute:
Attribute_Label: 207Pb_235U_ratio_2sigma
Attribute_Definition:
2-sigma (absolute uncertainty) on the ratio of 207Pb to 235U. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0006
Range_Domain_Maximum: 0.5920
Attribute:
Attribute_Label: 206Pb_238U_ratio
Attribute_Definition: The ratio of 206Pb to 238U. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0039
Range_Domain_Maximum: 0.3735
Attribute:
Attribute_Label: 206Pb_238U_ratio_2sigma
Attribute_Definition:
2-sigma (absolute uncertainty) on the ratio of 206Pb to 238U. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0001
Range_Domain_Maximum: 0.0256
Attribute:
Attribute_Label: rho_6_38vs7_35
Attribute_Definition:
Error correlation coefficient between 206Pb/238U and 207Pb/235U, for generating concordia plot. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -0.75
Range_Domain_Maximum: 1.00
Attribute:
Attribute_Label: 238U_206Pb_ratio
Attribute_Definition: The ratio of 238U to 206Pb.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.677
Range_Domain_Maximum: 253.970
Attribute:
Attribute_Label: 238U_206Pb_ratio_2sigma
Attribute_Definition: 2-sigma (uncertainty) on the ratio of 238U to 206Pb.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.076
Range_Domain_Maximum: 26.120
Attribute:
Attribute_Label: 207Pb_206Pb_ratio
Attribute_Definition: The ratio of 207Pb to 206Pb.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.03810
Range_Domain_Maximum: 0.53300
Attribute:
Attribute_Label: 207Pb_206Pb_ratio_2sigma
Attribute_Definition: 2-sigma (uncertainty) on the ratio of 207Pb to 206Pb.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00098
Range_Domain_Maximum: 0.08810
Attribute:
Attribute_Label: rho_38_6vs7_6
Attribute_Definition:
Error correlation coefficient between 238U/206Pb and 207Pb/206Pb, for generating concordia plot.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -1.00
Range_Domain_Maximum: 0.91
Attribute:
Attribute_Label: 208Pb_232Th_ratio
Attribute_Definition: The ratio of 208Pb to 232Th.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0012
Range_Domain_Maximum: 0.1100
Attribute:
Attribute_Label: 208Pb_232Th_ratio_2sigma
Attribute_Definition: 2-sigma (uncertainty) on the ratio of 208Pb to 232Th.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0001
Range_Domain_Maximum: 0.0270
Attribute:
Attribute_Label: 206Pb_208Pb_ratio
Attribute_Definition: The ratio of 206Pb to 208Pb.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.74
Range_Domain_Maximum: 343.00
Attribute:
Attribute_Label: 206Pb_208Pb_ratio_2sigma
Attribute_Definition: 2-sigma (uncertainty) values for the ratio of 206Pb to 208Pb.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.06
Range_Domain_Maximum: 51.74
Attribute:
Attribute_Label: 207Pb_235U_Age_Ma
Attribute_Definition: Age (Ma) calculated from 207Pb/235U ratio.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 26.1
Range_Domain_Maximum: 2059.3
Attribute_Units_of_Measure: Mega-annum, or millions of years before present
Attribute:
Attribute_Label: 207Pb_235U_Age_Ma_2sigma
Attribute_Definition: The 2-sigma (uncertainty) in the 207Pb/235U age (Ma).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.6
Range_Domain_Maximum: 344.9
Attribute_Units_of_Measure: Mega-annum, or millions of years before present
Attribute:
Attribute_Label: 206Pb_238U_Age_Ma
Attribute_Definition: Age (Ma) calculated from 206Pb/238U.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 25.3
Range_Domain_Maximum: 2045.8
Attribute_Units_of_Measure: Mega-annum, or millions of years before present
Attribute:
Attribute_Label: 206Pb_238U_Age_Ma_2sigma
Attribute_Definition: The 2-sigma (uncertainty) in the 206Pb/238U age (Ma).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.4
Range_Domain_Maximum: 148.8
Attribute_Units_of_Measure: Mega-annum, or millions of years before present
Attribute:
Attribute_Label: 207Pb_206Pb_Age_Ma
Attribute_Definition: Age (Ma) calculated from 207Pb/206Pb.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -478.3
Range_Domain_Maximum: 4335.2
Attribute_Units_of_Measure: Mega-annum, or millions of years before present
Attribute:
Attribute_Label: 207Pb_206Pb_Age_Ma_2sigma
Attribute_Definition: The 2-sigma (uncertainty) in the 207Pb/206Pb age (Ma).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -66.5
Range_Domain_Maximum: 1317.4
Attribute_Units_of_Measure: Mega-annum, or millions of years before present
Attribute:
Attribute_Label: Concordance
Attribute_Definition:
Ratio of age determined using 206Pb/238U versus age determined using 207Pb/235U.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.13
Range_Domain_Maximum: 1.24
Attribute:
Attribute_Label: Age_Type
Attribute_Definition:
Method used to calculate the values for each individual analysis that yielded a valid result. "age7corr" indicates a 207Pb-corrected 206Pb/238U age (Ma), for U-Pb ages < 1.4Ga; "agepb76" indicates 207Pb/206Pb age (Ma) for U-Pb ages >1.4Ga. Blank cells indicate no age type determination was made.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: age7corr
Enumerated_Domain_Value_Definition: 207Pb-corrected 206Pb/238U age (Ma), for U-Pb ages < 1.4Ga
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: Preferred_Age
Attribute_Definition:
Preferred grain age for calculation of sample age (in millions of years, or Ma), selected from one of two following fields containing corrected ages for each grain: 207Pb-corrected 206Pb/238U age (Ma) for U-Pb ages < 1.4Ga; For U-Pb ages > 1.4Ga, or 207Pb/206Pb for U-Pb ages >1.4Ga.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 25.1
Range_Domain_Maximum: 2100.7
Attribute_Units_of_Measure: Mega-annum, or millions of years before present
Attribute:
Attribute_Label: Preferred_Age_2sigma
Attribute_Definition:
Uncertainty (2-sigma) on preferred grain age (in millions of years, or Ma).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.6
Range_Domain_Maximum: 141.6
Attribute_Units_of_Measure: Mega-annum, or millions of years before present
Attribute:
Attribute_Label: 176Hf_177Hf_ratio
Attribute_Definition:
The ratio of 176Hf to 177Hf. Blank cells are present, indicating no data was measured, and some cells contain the value "-9999.000000", indicating failure of measurement equipment to resolve the data.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.281330
Range_Domain_Maximum: 0.283340
Attribute:
Attribute_Label: 176Hf_177Hf_ratio_2sigma
Attribute_Definition:
Uncertainty (2-sigma) values for the ratio of 176Hf to 177Hf. Blank cells are present, indicating no data was measured, and some cells contain the value "-9999.000000", indicating failure of measurement equipment to resolve the data.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.000031
Range_Domain_Maximum: 0.000320
Attribute:
Attribute_Label: 176Lu_177Hf_ratio
Attribute_Definition:
The ratio of 176Lu to 177Hf. Blank cells are present, indicating no data was measured, and some cells contain the value "-9999.000000", indicating failure of measurement equipment to resolve the data.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.000027
Range_Domain_Maximum: 0.013760
Attribute:
Attribute_Label: 176Lu_177Hf_ratio_2sigma
Attribute_Definition:
Uncertainty (2-sigma) values for the ratio of 176Lu to 177Hf. Blank cells are present, indicating no data was measured, and some cells contain the value "-9999.000000", indicating failure of measurement equipment to resolve the data.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.000001
Range_Domain_Maximum: 0.001200
Attribute:
Attribute_Label: 178Hf_177Hf_ratio
Attribute_Definition:
The ratio of 178Hf to 177Hf. Blank cells are present, indicating no data was measured, and some cells contain the value "-9999.000000", indicating failure of measurement equipment to resolve the data.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.46685
Range_Domain_Maximum: 1.46805
Attribute:
Attribute_Label: 178Hf_177Hf_ratio_2sigma
Attribute_Definition:
2-sigma (uncertainty) values for the ratio of 178Hf to 177Hf. Blank cells are present, indicating no data was measured, and some cells contain the value "-9999.000000", indicating failure of measurement equipment to resolve the data.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00006
Range_Domain_Maximum: 0.00049
Attribute:
Attribute_Label: eHf
Attribute_Definition:
Epsilon Hf value, assuming a chondritic 176Hf/177Hf value of 0.282772 (Blichert-Toft and Albarede, 1997). Blank cells are present, indicating no result was calculated.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -51.00
Range_Domain_Maximum: 20.09
Attribute:
Attribute_Label: eHf_2sigma
Attribute_Definition:
2-sigma (uncertainty) values for epsilon Hf value, assuming a chondritic 176Hf/177Hf value of 0.282772 (Blichert-Toft and Albarede, 1997). Blank cells are present, indicating no result was calculated.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.10
Range_Domain_Maximum: 11.32
Attribute:
Attribute_Label: 176Hf_177Hf_T
Attribute_Definition:
Age-corrected 176Hf/177Hf ratio, assuming Lutetium-176 decay constant of 1.86x10e-11 (Scherer et al., 2001); not calculated if discordant or no same-grain age measurement.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.281441
Range_Domain_Maximum: 0.283339
Attribute:
Attribute_Label: eHf_T
Attribute_Definition:
Age-corrected epsilon Hf value assuming chondritic 176Hf/177Hf ratio of 0.282772 and 176Lu/177Hf ratio of 0.0332 (Blichert-Toft and Albarede, 1997); not calculated if discordant or no same-grain age measurement.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -36.68
Range_Domain_Maximum: 20.83
Attribute:
Attribute_Label: T_DM_Hf
Attribute_Definition:
Model age in billions of years before present (Ga) assuming a present-day depleted mantle 176Lu/177Hf and 176Hf/177Hf of 0.0384 and 0.28325 (Griffin et al., 2000). Blank cells are present, indicating no result was calculated.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -0.13
Range_Domain_Maximum: 3.03
Attribute_Units_of_Measure: Giga-annum, or billions of years before present
Attribute:
Attribute_Label: Zr_ppm
Attribute_Definition:
Zirconium (Zr) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.62E+05
Range_Domain_Maximum: 5.39E+05
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Zr_cps
Attribute_Definition:
Raw, uncalibrated signal intensity of zirconium (Zr), measured in counts per second (cps). Provided for informational purposes only. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 5.80E+03
Range_Domain_Maximum: 9.65E+08
Attribute_Units_of_Measure: cps (counts per second)
Attribute:
Attribute_Label: Si_ppm
Attribute_Definition:
Silica (Si) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.29E+05
Range_Domain_Maximum: 2.35E+05
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Si_cps
Attribute_Definition:
Raw, uncalibrated signal intensity of silicon (Si), measured in counts per second (cps). Provided for informational purposes only. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.34E+06
Range_Domain_Maximum: 6.62E+07
Attribute_Units_of_Measure: cps (counts per second)
Attribute:
Attribute_Label: P_ppm
Attribute_Definition:
Phosphorous (P) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 39.8
Range_Domain_Maximum: 14700.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Ti_ppm
Attribute_Definition:
Titanium (Ti) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.69
Range_Domain_Maximum: 106000.00
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: V_ppm
Attribute_Definition:
Vanadium (V) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.53
Range_Domain_Maximum: 1.59
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Sr_ppm
Attribute_Definition:
Strontium (Sr) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.15
Range_Domain_Maximum: 0.42
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Y_ppm
Attribute_Definition:
Yttrium (Y) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 199
Range_Domain_Maximum: 23300
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Nb_ppm
Attribute_Definition:
Niobium (Nb) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.25
Range_Domain_Maximum: 1963.00
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: La_ppm
Attribute_Definition:
Lanthanum (La) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.001
Range_Domain_Maximum: 68000.000
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Ce_ppm
Attribute_Definition:
Cerium (Ce) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.6
Range_Domain_Maximum: 46000.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Pr_ppm
Attribute_Definition:
Praseodymium (Pr) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 9800.00
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Nd_ppm
Attribute_Definition:
Neodymium (Nd) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.2
Range_Domain_Maximum: 19100.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Sm_ppm
Attribute_Definition:
Samarium (Sm) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.3
Range_Domain_Maximum: 1970.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Eu_ppm
Attribute_Definition:
Europium (Eu) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.02
Range_Domain_Maximum: 117.00
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Gd_ppm
Attribute_Definition:
Gadolinium (Gd) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.3
Range_Domain_Maximum: 1840.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Tb_ppm
Attribute_Definition:
Terbium (Tb) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.9
Range_Domain_Maximum: 331.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Dy_ppm
Attribute_Definition:
Dysprosium (Dy) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 13.4
Range_Domain_Maximum: 2700.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Ho_ppm
Attribute_Definition:
Holmium (Ho) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 5.7
Range_Domain_Maximum: 781.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Er_ppm
Attribute_Definition:
Erbium (Er) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 30
Range_Domain_Maximum: 3560
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Tm_ppm
Attribute_Definition:
Thulium (Tm) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 8.6
Range_Domain_Maximum: 923.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Yb_ppm
Attribute_Definition:
Ytterbium (Yb) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 83
Range_Domain_Maximum: 7660
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Lu_ppm
Attribute_Definition:
Lutetium (Lu) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 14.9
Range_Domain_Maximum: 7660.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Hf_ppm
Attribute_Definition: Hafnium (Hf) concentration, in parts per million (ppm).
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2
Range_Domain_Maximum: 28469
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Ta_ppm
Attribute_Definition:
Tantalum (Ta) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.166
Range_Domain_Maximum: 457.000
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: Pb_ppm
Attribute_Definition:
Lead (Pb) concentration, in parts per million (ppm). Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.7
Range_Domain_Maximum: 1570.0
Attribute_Units_of_Measure: ppm (parts per million)
Attribute:
Attribute_Label: T_C
Attribute_Definition:
Ti-in-zircon thermometer (degrees C), after Ferry and Watson (2007), assuming SiO2 and TiO2 of 0.7. Blank cells are present, indicating no calculation for grains excluded from main populations.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 567
Range_Domain_Maximum: 931
Attribute_Units_of_Measure: degrees Celsius