Low-Temperature Thermochronometric Data along the Fairweather Fault, Southeast Alaska, 2015-2020

Identification_Information:

Citation:

Citation_Information:

Originator: Richard O. Lease (ORCID: 0000-0003-2582-8966)
Publication_Date: 20210125
Title:

Geospatial_Data_Presentation_Form: tabular digital data
Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey, Alaska Science Center

Other_Citation_Details:

Suggested citation: Lease, R.O., 2021, Low-temperature thermochronometric data along the Fairweather fault, southeast Alaska, 2015-2020: U.S. Geological Survey data release, https://doi.org/10.5066/P9FUIJG8.

Online_Linkage: https://doi.org/10.5066/P9FUIJG8
Larger_Work_Citation:

Citation_Information:

Originator: Richard O. Lease (ORCID: 0000-0003-2582-8966)
Originator: Haeussler, P.J. (ORCID: 0000-0002-1503-6247)
Originator: Witter, R. (ORCID: 0000-0002-1721-254X)
Originator: Stockli, D. (ORCID: 0000-0001-7652-2129)
Originator: Bender, A. (ORCID: 0000-0001-7469-1957)
Originator: Kelsey, H.
Originator: O'Sullivan, P. (ORCID: 0000-0002-7247-5107)
Publication_Date: 2020
Title:

Extreme Quaternary Plate Boundary Exhumation and Strike-Slip Localized Along the Southern Fairweather Fault, Alaska

Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Geology
Issue_Identification: Volume 49

Other_Citation_Details:

Suggested citation: Lease, R.O., Haeussler, P.J., Witter, R., Stockli, D., Bender, A., Kelsey, H., and O'Sullivan, P., 2020, Extreme Quaternary plate boundary exhumation and strike-slip localized along the southern Fairweather fault, Alaska: Geology, volume 49, https://doi.org/10.1130/G48464.1.

Online_Linkage: https://doi.org/10.1130/G48464.1

Description:

Abstract:

This data set provides low-temperature thermochronometric data from 15 rock samples collected along the Fairweather fault in southeast Alaska. These data are from four different analyses used to estimate cooling ages: 1) apatite (U-Th)/He, 2) zircon (U-Th)/He, 3) apatite fission-track, and 4) zircon fission-track.

Purpose:

This dataset was collected to ascertain the exhumation history of the Fairweather fault study area over the past 3 million years to better understand its role in localizing plate boundary strain.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2021

Currentness_Reference: publication date

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -138.5
East_Bounding_Coordinate: -137.0
North_Bounding_Coordinate: 59.5
South_Bounding_Coordinate: 58.0

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation

Theme:

Theme_Keyword_Thesaurus: NASA GCMD Earth Science Keywords Thesaurus
Theme_Keyword: earth science
Theme_Keyword: erosion
Theme_Keyword: tectonic uplift
Theme_Keyword: faults
Theme_Keyword: tectonics
Theme_Keyword: crustal motion
Theme_Keyword: fault movement
Theme_Keyword: strain
Theme_Keyword: plate boundaries
Theme_Keyword: neotectonics
Theme_Keyword: age determinations

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: geochronology
Theme_Keyword: radiometric dating
Theme_Keyword: fission-track dating
Theme_Keyword: neotectonic processes
Theme_Keyword: erosion
Theme_Keyword: uplift
Theme_Keyword: faulting (geologic)

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: low-temperature thermochronology
Theme_Keyword: apatite
Theme_Keyword: zircon
Theme_Keyword: (U-Th)/He
Theme_Keyword: fission track

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ASC345

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Alaska
Place_Keyword: Glacier Bay National Park
Place_Keyword: Icy Point
Place_Keyword: Lituya Bay
Place_Keyword: Brabazon Range

Access_Constraints: None
Use_Constraints:

None. Users are advised to read the metadata thoroughly to understand appropriate use and data limitations.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey, Alaska Science Center

Contact_Address:

Address_Type: mailing and physical address
Address: 4210 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508-4626
Country: U.S.A.

Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov

Data_Set_Credit:

This data set includes 15 different samples collected along the Fairweather fault in southeast Alaska. (U-Th)/He thermochronology was performed on 14 apatite and 7 zircon samples at the University of Texas by Daniel Stockli. Fission-track analysis was performed on 2 apatite and 2 zircon samples at GeoSep Services by Paul B. O'Sullivan.

Cross_Reference:

Citation_Information:

Originator: Haeussler, Peter (ORCID: 0000-0002-1503-6247)
Originator: Witter, Robert (ORCID: 0000-0002-1721-254X)
Publication_Date: 2017
Title:

Characterizing the Active Queen Charlotte-Fairweather Fault System

Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey, Alaska Science Center

Online_Linkage:

https://www.usgs.gov/centers/asc/science/characterizing-active-queen-charlotte-fairweather-fault-system

Cross_Reference:

Citation_Information:

Originator: Witter, Robert (ORCID: 0000-0002-1721-254X)
Publication_Date: 2007
Title: Alaska Earthquake Hazards
Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey, Alaska Science Center

Online_Linkage: https://alaska.usgs.gov/portal/project.php?project_id=33

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

All analyses included standards run throughout the process to monitor procedures and maintain consistency.

Logical_Consistency_Report:

Blank cells in the data set represent either a sample not analyzed or an age not reported. Further explanation available in Attribute_Definition.

Completeness_Report:

This data set is complete. Not every sample was analyzed by all four dating methods due to availability of material suitable for dating and funding constraints.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

A handheld GPS was used to locate samples #1A, 1B, 1C, 1D, 1E, 1G, and 3 in the field, and have a horizontal accuracy of less than 5 meters. The locations of the other samples were digitized from the original NAD27 topographic sheets used during geologic field mapping, then converted to WGS84. These samples have an estimated horizontal accuracy of less than 100 meters.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Donelick, R.A.
Originator: O'Sullivan, P.B.
Originator: Ketcham, R.A.
Publication_Date: 2005
Title: Apatite Fission-track Analysis
Series_Information:

Series_Name: Reviews in Mineralogy and Geochemistry
Issue_Identification: volume 58, p. 49-94

Publication_Information:

Publication_Place: Chantilly, VA
Publisher: Mineralogical Society of America

Online_Linkage: https://doi.org/10.2138/rmg.2005.58.3

Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2005

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Donelick and others, 2005
Source_Contribution:

Full description of analytical procedures of apatite fission-track analyses.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Tagami, T.
Publication_Date: 2005
Title:

Zircon Fission-track Thermochronology and Applications to Fault Studies

Series_Information:

Series_Name: Reviews in Mineralogy and Geochemistry
Issue_Identification: volume 58, p. 95-122

Publication_Information:

Publication_Place: Chantilly, VA
Publisher: Mineralogical Society of America

Online_Linkage: https://doi.org/10.2138/rmg.2005.58.4

Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2005

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Tagami, 2005
Source_Contribution:

Full description of analytical procedures of zircon fission-track analyses.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Reiners, P.W.
Publication_Date: 2005
Title: Zircon (U-Th)/He Thermochronometry
Series_Information:

Series_Name: Reviews in Mineralogy and Geochemistry
Issue_Identification: volume 58, p. 151-179

Publication_Information:

Publication_Place: Chantilly, VA
Publisher: Mineralogical Society of America

Online_Linkage: https://doi.org/10.2138/rmg.2005.58.6

Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2005

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Reiners, 2005
Source_Contribution:

Full description of analytical procedures of zircon (U-Th)/He thermochronometry.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Farley, K.A.
Originator: Stockli, D.F.
Publication_Date: 2002
Title:

(U-Th)/He Dating of Phosphates: Apatite, Monazite, and Xenotime

Series_Information:

Series_Name: Reviews in Mineralogy and Geochemistry
Issue_Identification: volume 48, p. 559-577

Publication_Information:

Publication_Place: Chantilly, VA
Publisher: Mineralogical Society of America

Online_Linkage: https://doi.org/10.2138/rmg.2002.48.15

Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2002

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Farley and Stockli, 2002
Source_Contribution:

Full description of analytical procedures of apatite (U-Th)/He dating.

Source_Information:

Source_Citation:

Citation_Information:

Extreme Quaternary Plate Boundary Exhumation and Strike-Slip Localized Along the Southern Fairweather Fault, Alaska

Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Geology
Issue_Identification: Volume 49

Other_Citation_Details:

Online_Linkage: https://doi.org/10.1130/G48464.1

Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2020

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Lease and others, 2020
Source_Contribution:

This is the larger work citation which interprets this data. Also includes supplementary material with full description of laboratory procedures and modeling methods of apatite and zircon fission track, and apatite and zircon (U-Th)/He analyses of this study.

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey
Publication_Date: 2016
Title: USGS 13 arc-second n60w139 1x1 degree
Geospatial_Data_Presentation_Form: DEM (digital elevation model)
Publication_Information:

Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey

Online_Linkage:

https://www.sciencebase.gov/catalog/item/5f77857382ce1d74e7d6ce98

Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2017

Source_Currentness_Reference: download date

Source_Citation_Abbreviation: 3DEP (3D Elevation Program)
Source_Contribution: Used to calculate elevations of samples collected.

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey
Publication_Date: 2016
Title: USGS 13 arc-second n60w138 1x1 degree
Geospatial_Data_Presentation_Form: DEM (digital elevation model)
Publication_Information:

Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey

Online_Linkage:

https://www.sciencebase.gov/catalog/item/5f77857382ce1d74e7d6ce96

Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2017

Source_Currentness_Reference: download date

Source_Citation_Abbreviation: 3DEP (3D Elevation Program)
Source_Contribution: Used to calculate elevations of samples collected.

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey
Publication_Date: 2016
Title: USGS 13 arc-second n59w138 1x1 degree
Geospatial_Data_Presentation_Form: DEM (digital elevation model)
Publication_Information:

Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey

Online_Linkage:

https://www.sciencebase.gov/catalog/item/5f77857082ce1d74e7d6ce78

Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2017

Source_Currentness_Reference: download date

Source_Citation_Abbreviation: 3DEP (3D Elevation Program)
Source_Contribution: Used to calculate elevations of samples collected.

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey
Publication_Date: 2016
Title: USGS 13 arc-second n59w137 1x1 degree
Geospatial_Data_Presentation_Form: DEM (digital elevation model)
Publication_Information:

Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey

Online_Linkage:

https://www.sciencebase.gov/catalog/item/5f77857082ce1d74e7d6ce76

Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2017

Source_Currentness_Reference: download date

Source_Citation_Abbreviation: 3DEP (3D Elevation Program)
Source_Contribution: Used to calculate elevations of samples collected.

Process_Step:

Process_Description:

Apatite and zircon fission-track, AFT and ZFT. Grain mounts were polished to expose internal grain surfaces and etched in 5.5 N HNO3 for apatite or a eutectic melt of NaOH+KOH for zircon. Spontaneous fission tracks were counted in unpolarized light at 2000x magnification. The 238U concentrations from grain surfaces were measured on a Thermo Element2 HR-ICP-MS equipped with a New Wave ND-YAG 218nm laser ablation system. The fission track ages were calculated using: (a) the ratio of the density of natural fission tracks present in the grain to the amount of 238U present, and (b) a modified version of the radioactive decay equation that includes a LA-ICPMS zeta calibration factor (Donelick and others, 2005). After age analysis, apatite fission track lengths were measured and characterized.

Process_Date: 2017

Process_Step:

Process_Description:

Apatite and zircon (U-Th)/He, AHe and ZHe. Individual mineral grains were screened for quality, size, shape, and inclusions using a binocular microscope at 180X magnification. Handpicked grains were measured for alpha-ejection correction and then placed in Pt packets. Packets were heated to 1070 degree C for 5 minutes (apatite) or 1300 degrees C for 10 minutes (zircon) to extract radiogenic 4He, which was analyzed on a Balzers PrismaPlus QMS-200 quadrupole mass spectrometer. Degassed grains were then dissolved using standard procedures. Sample solutions were analyzed for U, Th, and Sm content using a Thermo Element2 HR-ICP-MS. (U-Th)/He dates and all associated data were calculated using custom software (Farley and Stocki, 2002).

Process_Date: 2019

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.001
Longitude_Resolution: 0.001
Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: WGS84
Ellipsoid_Name: WGS84
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257223563

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988 (NAVD 88)
Altitude_Resolution: 1.000000
Altitude_Distance_Units: meters
Altitude_Encoding_Method: Implicit coordinate

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: thermochronology_sampleAttributes_Fairweather_Lease_2020.csv
Entity_Type_Definition:

Table containing sample description, including location, elevation, and brief rock descriptions. Table contains 23 samples.

Entity_Type_Definition_Source: Author defined

Attribute:

Attribute_Label: map_id
Attribute_Definition:

Sample identifier used on maps, diagrams, and tables in publication Lease and others, 2020.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Map labels range discontinuously from 1 to 22 and may have letter suffix.

Attribute:

Attribute_Label: field_id
Attribute_Definition:

Unique sample identifier assigned when the sample was collected in the field. It is a concatenation of year collected, an abbreviation identifying the collector, and numbers and letters.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

A concatenation of year collected, an abbreviation identifying the collector, and numbers and letters.

Attribute:

Attribute_Label: latitude
Attribute_Definition: Latitude given in decimal degrees; datum WGS84
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 58.3815
Range_Domain_Maximum: 59.3325
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: longitude
Attribute_Definition: Longitude given in decimal degrees; datum WGS84
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -138.3500
Range_Domain_Maximum: -136.9328
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: elevation_m
Attribute_Definition:

Elevation of collected sample based on DEM with 10-meter horizontal resolution. Elevation errors are <30 meters. DEM data from U.S. Geological Survey, The National Map 2017, 3DEP products and services; https://www.usgs.gov/core-science-systems/ngp/3dep.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 1320
Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: description
Attribute_Definition: Rock type determined in the field using visual observations.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Attributes used in this dataset include: diorite, gabbro, gneiss, granite, granodiorite, greywacke, sandstone, schist, quartz diorite, and quartzite.

Detailed_Description:

Entity_Type:

Entity_Type_Label: thermochronology_UThHe_Fairweather_Lease_2020.csv
Entity_Type_Definition:

Analytical data and uncertainties for apatite and zircon (U-Th)/He analyses. Each sample is represented by several single-grain splits. Data are grain dimensions, and U, Th, Sm, and He measurements. Geologic age and other values determined according to Farley and Stockli, 2002. Ages are presented in millions of years. The table contains 103 records.

Entity_Type_Definition_Source: Author defined

Attribute:

Attribute_Label: map_id
Attribute_Definition:

Sample identifier used on maps, diagrams, and tables in publication Lease and others, 2020.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Map labels range discontinuously from 1 to 22 and may have letter suffix.

Attribute:

Attribute_Label: field_id
Attribute_Definition:

Unique sample identifier assigned when the sample was collected in the field. It is a concatenation of year collected, an abbreviation identifying the collector, and numbers and letters.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

A concatenation of year collected, an abbreviation identifying the collector, and numbers and letters.

Attribute:

Attribute_Label: sample_id
Attribute_Definition:

A unique identifier in this table. A concatenation of field_id and a laboratory split identifier.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Concatenation of field_id and a laboratory split identifier

Attribute:

Attribute_Label: mineral
Attribute_Definition: Type of mineral grain (apatite or zircon) analyzed.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Values in this dataset include apatite and zircon.

Attribute:

Attribute_Label: rs_um
Attribute_Definition:

Effective spherical radius of grain calculated based on grain dimensions and measured in micrometers (microns).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 24
Range_Domain_Maximum: 70
Attribute_Units_of_Measure: micrometer (micron)

Attribute:

Attribute_Label: mass_mg
Attribute_Definition: Mass of grain measured in micrograms.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.34
Range_Domain_Maximum: 15.22
Attribute_Units_of_Measure: microgram

Attribute:

Attribute_Label: 4He_nmol_g
Attribute_Definition: Measure of radiogenic 4He (helium) in nanomole/gram
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.006
Range_Domain_Maximum: 98.884
Attribute_Units_of_Measure: nanomole per gram (nmol/g)

Attribute:

Attribute_Label: U_ppm
Attribute_Definition: Measure of U (uranium) in parts per million
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.2
Range_Domain_Maximum: 3892.2
Attribute_Units_of_Measure: parts per million (ppm)

Attribute:

Attribute_Label: Th_ppm
Attribute_Definition: Measure of Th (thorium) in parts per million
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.9
Range_Domain_Maximum: 1035.7
Attribute_Units_of_Measure: parts per million (ppm)

Attribute:

Attribute_Label: Sm_ppm
Attribute_Definition:

Measure of Sm (samarium) in parts per million. Blank cells are present.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.8
Range_Domain_Maximum: 356.5
Attribute_Units_of_Measure: parts per million (ppm)

Attribute:

Attribute_Label: eU_ppm
Attribute_Definition:

Effective uranium concentration, a parameter that weights the decay of the two parents for their alpha productivity, computed U + 0.235xTh.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.5
Range_Domain_Maximum: 4130.6
Attribute_Units_of_Measure: parts per million (ppm)

Attribute:

Attribute_Label: Ft_corr
Attribute_Definition:

Alpha ejection correction, which is the fraction of 4He alpha particles retained, and is calculated from grain dimensions and chemistry (Farley and Stockli, 2002).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.44
Range_Domain_Maximum: 0.83

Attribute:

Attribute_Label: date_ma
Attribute_Definition:

Date in millions of years. Date has been corrected for alpha ejection (Farley and Stockli, 2002).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.17
Range_Domain_Maximum: 91.99
Attribute_Units_of_Measure: millions of years (Ma)

Attribute:

Attribute_Label: date_1sigma
Attribute_Definition:

One sigma analytical uncertainty on date based on reproducibility of standards.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 5.52
Attribute_Units_of_Measure: millions of years (Ma)

Attribute:

Attribute_Label: comments
Attribute_Definition:

Comments about anomalous records which were excluded from age calculations in Lease and others, 2020.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Comments about anomalous records.

Detailed_Description:

Entity_Type:

Entity_Type_Label: thermochronology_fissionTrackAge_Fairweather_Lease_2020.csv
Entity_Type_Definition:

Data for fission-track single-grain analyses. All analyses performed by Paul B. O'Sullivan, GeoSep Services, Moscow, Idaho. Primary AFT Zeta = 12.357 +/- 0.2251 (1 sigma). Primary ZFT Zeta = 0.0401 +/- 0.0005 (1 sigma). Geologic age determined by apatite fission-track (AFT) dating, which has an effective closure temperature of about 110 degrees Celsius, or zircon fission-track (ZFT) dating, which has an effective closure temperature of about 250 degrees Celsius. Age is presented in millions of years. Blank cell represents that the sample was not analyzed. Table contains 128 analyses.

Entity_Type_Definition_Source: Author defined

Attribute:

Attribute_Label: map_id
Attribute_Definition:

Sample identifier used on maps, diagrams, and tables in publication Lease and others, 2020.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Map labels range discontinuously from 1 to 5 and may have letter suffix.

Attribute:

Attribute_Label: field_id
Attribute_Definition:

Unique sample identifier assigned when the sample was collected in the field. It is a concatenation of year collected, an abbreviation identifying the collector, and numbers and letters. Each field_id is presented multiple times as this table contains analyses of different single grain splits from each sample.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

A concatenation of year collected, an abbreviation identifying the collector, and numbers and letters.

Attribute:

Attribute_Label: mineral
Attribute_Definition: Type of mineral grain (apatite or zircon) analyzed.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Values in this dataset include apatite and zircon.

Attribute:

Attribute_Label: grain
Attribute_Definition:

Numeric code assigned to a single grain. The numeric code is unique for each sample (field_id).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1
Range_Domain_Maximum: 40

Attribute:

Attribute_Label: Ns
Attribute_Definition: Number of spontaneous tracks counted
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 31

Attribute:

Attribute_Label: area_cm2
Attribute_Definition: Surface area of mineral grain in which tracks were counted.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.0000044
Range_Domain_Maximum: 0.0000485
Attribute_Units_of_Measure: centimeter squared

Attribute:

Attribute_Label: U_Ca
Attribute_Definition: Ratio of 238Uranium to 43Calcium. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.000141
Range_Domain_Maximum: 0.446290

Attribute:

Attribute_Label: U_Ca_1sigma
Attribute_Definition:

One sigma analytical error of 238Uranium/43Calcium ratio. Blank cells are present.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.000018
Range_Domain_Maximum: 0.032843

Attribute:

Attribute_Label: U_Si
Attribute_Definition: Ratio of 238Uranium to 29Silicon. Blank cells are present.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.00330
Range_Domain_Maximum: 0.02853

Attribute:

Attribute_Label: U_Si_1sigma
Attribute_Definition:

One sigma analytical error of 238Uranium/29Silcon ratio. Blank cells are present.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.00067
Range_Domain_Maximum: 0.00580

Attribute:

Attribute_Label: Dpar_um
Attribute_Definition:

Dpar represents the diameter, in micrometers, of fission-track etch pits parallel to the crystallographic c-axis. For each apatite grain measured, between one and four etched pit diameters were measured and an arithmetic mean Dpar value was calculated. Blank cells are present.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1.31
Range_Domain_Maximum: 2.26
Attribute_Units_of_Measure: micrometer or micron

Attribute:

Attribute_Label: Dper_um
Attribute_Definition:

Dper represents the diameter, in micrometers, of fission-track etch pits perpendicular to the crystallographic c-axis. For each apatite grain measured, between one and for etch pit diameters were measured and an arithmetic mean Dper value calculated. Blank cells are present.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.22
Range_Domain_Maximum: 0.60
Attribute_Units_of_Measure: micrometer or micron

Attribute:

Attribute_Label: U_ppm
Attribute_Definition:

Uranium, in parts per million, measured using the laser ablation inductively couple plasma-mass spectrometry (LA_ICPMS) method (Donelick and others, 2005).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 875.00
Attribute_Units_of_Measure: parts per million (ppm)

Attribute:

Attribute_Label: Th_ppm
Attribute_Definition:

Thorium, in parts per million, measured using the laser ablation inductively couple plasma-mass spectrometry (LA_ICPMS) method (Donelick and others, 2005).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 697.52
Attribute_Units_of_Measure: parts per million (ppm)

Attribute:

Attribute_Label: Sm_ppm
Attribute_Definition:

Samarium, in parts per million, measured using the laser ablation inductively couple plasma-mass spectrometry (LA_ICPMS) method (Donelick and others, 2005).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 414.36
Attribute_Units_of_Measure: parts per million (ppm)

Attribute:

Attribute_Label: FT_age_ma
Attribute_Definition:

Fission-track age calculated for the single (Donelick and others, 2005).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.0
Range_Domain_Maximum: 104.4
Attribute_Units_of_Measure: millions of years (Ma)

Attribute:

Attribute_Label: lower95CI_ma
Attribute_Definition:

Lower 95th confidence interval fission-track age in millions of years (Donelick and others, 2005).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.0
Range_Domain_Maximum: 81.5
Attribute_Units_of_Measure: millions of years (Ma)

Attribute:

Attribute_Label: upper95CI_ma
Attribute_Definition:

Upper 95th confidence interval fission-track age in millions of years (Donelick and others, 2005).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1.9
Range_Domain_Maximum: 3922.8
Attribute_Units_of_Measure: millions of years (Ma)

Detailed_Description:

Entity_Type:

Entity_Type_Label: thermochronology_fissionTrackLength_Fairweather_Lease_2020.csv
Entity_Type_Definition:

Data for apatite fission-track length measurements and characterization. All analyses performed by Paul B. O'Sullivan, GeoSep Services, Moscow, Idaho. The table contains 79 measurements from a single sample.

Entity_Type_Definition_Source: Author defined

Attribute:

Attribute_Label: map_id
Attribute_Definition:

Sample identifier used on maps, diagrams, and tables in publication Lease and others, 2020.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Only one map_id is present, 1E.

Attribute:

Attribute_Label: field_id
Attribute_Definition:

Sample identifier assigned when the sample was collected in the field. It is a concatenation of year collected, an abbreviation identifying the collector, and numbers and letters.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

A concatenation of year collected, an abbreviation identifying the collector, and number and letters.

Attribute:

Attribute_Label: mineral
Attribute_Definition: Type of mineral grain (apatite or zircon) analyzed.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Values in this dataset include apatite and zircon.

Attribute:

Attribute_Label: track_id
Attribute_Definition:

Numeric code assigned to a single grain. The numeric code is unique for each sample (field_id). The first number identifies a grain, and the second number identifies a track within that grain.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Numeric codes identifying a grain and track in that grain. The two numbers are separated with a decimal point.

Attribute:

Attribute_Label: length_um
Attribute_Definition: Length of a fission track measured in microns.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 7.97
Range_Domain_Maximum: 15.56
Attribute_Units_of_Measure: micrometer or micron

Attribute:

Attribute_Label: angle_c
Attribute_Definition:

Angle between fission track and grain crystallographic c-axis.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 14.01
Range_Domain_Maximum: 87.85
Attribute_Units_of_Measure: angular degrees

Attribute:

Attribute_Label: Dpar_um
Attribute_Definition:

Dpar represents the diameter of fission-track etch pits parallel to the crystallographic c-axis. For each apatite grain measured, between one and four etch pit diameters were measured and an arithmetic mean Dpar value calculated.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1.70
Range_Domain_Maximum: 3.33
Attribute_Units_of_Measure: micrometer or micron

Attribute:

Attribute_Label: Dper_um
Attribute_Definition:

Dper represents the diameter of fission-track etch pits perpendicular to the crystallographic c-axis. For each apatite grain measured, between one and four etch pit diameters were measured and an arithmetic mean Dper value calculated.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.25
Range_Domain_Maximum: 0.92
Attribute_Units_of_Measure: micrometer or micron

Low-Temperature Thermochronometric Data along the Fairweather Fault, Southeast Alaska, 2015-2020

Metadata: