Entity_Type:
Entity_Type_Label: tephraData_alaska_wallace_2018.csv
Entity_Type_Definition:
Raw and normalized major-element glass compositions of tephra from Driftwood Bay, Umnak Island, and Stardust Bay, Sedanka Island, Alaska. This data set presents raw electron probe microanalysis point results for major oxides in volcanic glasses and also includes all datapoints normalized to100 percent.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: Probe_point_no
Attribute_Definition:
Number assigned by individual probe session in sequential order.Gaps in numbering represent deleted samples due to either the samples not being associated with this study, or discovery of the sample not being a tephra deposit. Duplication of numbers indicates when a new file was created during the same sample session.
Attribute_Definition_Source: USGS Electron Microprobe Lab, Menlo Park, California
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 289
Attribute:
Attribute_Label: Sample_point_no
Attribute_Definition:
Concatenation of the Alaska Tephra Laboratory and Data Center identification number or glass standard abbreviation (RLS, VG, and GSC samples) and a number indicating the order in which the measurement was acquired on the electron probe microanalyzer.
Attribute_Definition_Source:
USGS Alaska Tephra Laboratory and Data Center, Anchorage, Alaska
Attribute_Domain_Values:
Unrepresentable_Domain:
Concatenation of the Alaska Tephra Laboratory and Data Center identification number or glass standard abbreviation (RLS, VG, and GSC samples) and a number indicating the order in which the measurement was acquired on the electron probe microanalyzer.
Attribute:
Attribute_Label: SiO2_pct
Attribute_Definition:
Silicon dioxide, in weight percent. This is the raw measure and has not been normalized.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 46.41
Range_Domain_Maximum: 77.08
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: TiO2_pct
Attribute_Definition:
Titanium dioxide, in weight percent. This is the raw measure and has not been normalized.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 2.85
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Al2O3_pct
Attribute_Definition:
Aluminum trioxide, in weight percent. This is the raw measure and has not been normalized.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 11.1
Range_Domain_Maximum: 21.32
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: FeOT_pct
Attribute_Definition:
Total iron oxide, in weight percent. This is the raw measure and has not been normalized.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.37
Range_Domain_Maximum: 15.90
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: MnO_pct
Attribute_Definition:
Manganese oxide, in weight percent. This is the raw measure and has not been normalized.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 0.36
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: MgO_pct
Attribute_Definition:
Magnesium oxide, in weight percent. This is the raw measure and has not been normalized.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 6.81
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: CaO_pct
Attribute_Definition:
Calcium oxide, in weight percent. This is the raw measure and has not been normalized.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.06
Range_Domain_Maximum: 11.33
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Na2O_pct
Attribute_Definition:
Sodium oxide, in weight percent. This is the raw measure and has not been normalized.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.95
Range_Domain_Maximum: 5.28
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: K2O_pct
Attribute_Definition:
Potassium oxide, in weight percent. This is the raw measure and has not been normalized.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.15
Range_Domain_Maximum: 4.99
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Cl_pct
Attribute_Definition:
Chlorine, in weight percent. This is the raw measure and has not been normalized.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 0.24
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: P2O5_pct
Attribute_Definition:
Phosphorus oxide, in weight percent. This is the raw measure and has not been normalized.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 0.74
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Total
Attribute_Definition:
Total of the major elements, in weight percent. This is the total of raw measures and has not been normalized.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 82.37
Range_Domain_Maximum: 101.47
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: SiO2_pct_n
Attribute_Definition:
Silicon dioxide normalized, in weight percent. This value has been normalized to 100 percent. Blank or null values are present when the value Total is considered too low (<95 percent) to determine normalized values.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 50.31
Range_Domain_Maximum: 77.02
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: TiO2_pct_n
Attribute_Definition:
Titanium dioxide normalized, in weight percent. This value has been normalized to 100 percent. Blank or null values are present when the value Total is considered too low (<95 percent) to determine normalized values.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 2.83
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Al2O3_pct_n
Attribute_Definition:
Aluminum trioxide normalized, in weight percent. This value has been normalized to 100 percent. Blank or null values are present when the value Total is considered too low (<95 percent) to determine normalized values.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 11.04
Range_Domain_Maximum: 21.34
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: FeOT_pct_n
Attribute_Definition:
Total iron oxide normalized, in weight percent. This value has been normalized to 100 percent. Blank or null values are present when the value Total is considered too low (<95 percent) to determine normalized values.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.38
Range_Domain_Maximum: 15.82
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: MnO_pct_n
Attribute_Definition:
Manganese oxide normalized, in weight percent. This value has been normalized to 100 percent. Blank or null values are present when the value Total is considered too low (<95 percent) to determine normalized values.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 0.36
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: MgO_pct_n
Attribute_Definition:
Magnesium oxide normalized, in weight percent. This value has been normalized to 100 percent. Blank or null values are present when the value Total is considered too low (<95 percent) to determine normalized values.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 6.89
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: CaO_pct_n
Attribute_Definition:
Calcium oxide normalized, in weight percent. This value has been normalized to 100 percent. Blank or null values are present when the value Total is considered too low (<95 percent) to determine normalized values.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.06
Range_Domain_Maximum: 11.51
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Na2O_pct_n
Attribute_Definition:
Sodium oxide normalized, in weight percent. This value has been normalized to 100 percent. Blank or null values are present when the value Total is considered too low (<95 percent) to determine normalized values.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.24
Range_Domain_Maximum: 5.27
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: K2O_pct_n
Attribute_Definition:
Potassium oxide normalized, in weight percent. This value has been normalized to 100 percent. Blank or null values are present when the value Total is considered too low (<95 percent) to determine normalized values.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.15
Range_Domain_Maximum: 5.06
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Cl_pct_n
Attribute_Definition:
Chlorine normalized, in weight percent. This value has been normalized to 100 percent. Blank or null values are present when the value Total is considered too low to determine normalized values.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 0.25
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: P2O5_pct_n
Attribute_Definition:
Phosphorus oxide normalized, in weight percent. This value has been normalized to 100 percent. Blank or null values are present when the value Total is considered too low (<95 percent) to determine normalized values.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 0.73
Attribute_Units_of_Measure: weight percent
Attribute:
Attribute_Label: Comment
Attribute_Definition:
Attribute to identify standards or samples with inadequate raw totals to calculate meaningful normalized values. Blank/empty cells indicate expected values of unknown samples were measured.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: standard
Enumerated_Domain_Value_Definition:
The comment 'standard' identifies that the analysis has been run on a laboratory standard to either monitor instrument drift or use as a calibration.
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: low total
Enumerated_Domain_Value_Definition:
The comment 'low total' identifies an analysis which has a low Total (sum of the raw major oxide values) less than 95 percent.
Enumerated_Domain_Value_Definition_Source: Author defined
Entity_Type:
Entity_Type_Label: tephraData_locationInformation_alaska_wallace_2018.csv
Entity_Type_Definition:
Sample information, including lab identifier, site name, core name, core depth, and the location in latitude and longitude.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: AT_number
Attribute_Definition:
USGS Alaska Tephra Laboratory and Data Center identification number.
Attribute_Definition_Source:
USGS Alaska Tephra Laboratory and Data Center, Anchorage, Alaska
Attribute_Domain_Values:
Unrepresentable_Domain: Concatenation of letter AT, a hyphen, and a number
Attribute:
Attribute_Label: Sample_id
Attribute_Definition:
Field sample identifier describing the site, core, and sample depth.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Concatenation of alpha and numeric abbreviations that designate the field site, core name, and sample depth. Field site is either NIK (Nikolski) or SD (Sedanka). Core names are CF (Cabin Flat) or E (site E), followed by an alphanumeric value. Sample depths are given as a range in centimeters.
Attribute:
Attribute_Label: Latitude
Attribute_Definition:
Latitude, given in decimal degrees, datum WGS84. Measured with a handheld GPS unit.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 52.9507
Range_Domain_Maximum: 53.7751
Attribute_Units_of_Measure: decimal degrees
Attribute:
Attribute_Label: Longitude
Attribute_Definition:
Longitude, given in decimal degrees, datum WGS84. Measured with a handheld GPS unit.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -166.2020
Range_Domain_Maximum: -168.7861
Attribute_Units_of_Measure: decimal degrees