U-Pb Isotopic Data and Ages of Detrital Zircon and Volcanic Zircon Grains from the Torok and Nanushuk Formations, Arctic Alaska, 2021

Identification_Information:

Citation:

Citation_Information:

Originator: Lease, Richard O. (ORCID: 0000-0003-2582-8966)
Originator: Kylander-Clark, Andrew R.C. (ORCID: 0000-0003-1393-3531)
Originator: Houseknecht, David W. (ORCID: 0000-0002-9633-6910)
Publication_Date: 20220121
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., Kylander-Clark, A.R.C., and Houseknecht, D.W., 2022, U-Pb isotopic data and ages of detrital zircon and volcanic zircon grains from the Torok and Nanushuk Formations, Arctic Alaska, 2021: U.S. Geological Survey data release, https://doi.org/10.5066/P9F8BHTN

Online_Linkage: https://doi.org/10.5066/P9F8BHTN
Larger_Work_Citation:

Citation_Information:

Originator: U.S. Geological Survey, Alaska Science Center
Publication_Date: 2017
Title: Alaska Petroleum Systems
Geospatial_Data_Presentation_Form: website
Series_Information:

Series_Name: Alaska Science Portal
Issue_Identification: 47

Publication_Information:

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

Other_Citation_Details:

This is a link to the broader USGS Alaska Science Center research project supported by these data. Users will find a description of the research project and links to associated reports, publications, and data products.

Online_Linkage: https://alaska.usgs.gov/portal/project.php?project_id=47

Description:

Abstract:

This dataset contains U-Pb isotopic data and associated ages of zircon grains from 27 sedimentary samples and one volcanic ash sample from the Cretaceous Torok and Nanushuk Formations. Seven samples were collected from outcrop and 21 samples were collected from archived core material from oil exploration wells on the North Slope of Arctic Alaska. Zircon grains were analyzed at the University of California, Santa Barbara (UCSB) between 2013 and 2018 using laser-ablation inductively coupled plasma mass spectrometry (LA-ICPMS) techniques. The study was funded by the Energy Resources Program of the U.S. Geological Survey (USGS).

Purpose:

The dataset was collected to ascertain the provenance and age of the Cretaceous Torok-Nanushuk depositional sequence. Detailed interpretations of these data and a discussion of the results and implications of the study can be found in Lease and others, 2022.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2022

Currentness_Reference: publication date

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -166.0000
East_Bounding_Coordinate: -144.0000
North_Bounding_Coordinate: 72.0000
South_Bounding_Coordinate: 69.0000

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ASC429

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: geology
Theme_Keyword: geochronology
Theme_Keyword: radiometric dating
Theme_Keyword: uranium-lead analysis

Theme:

Theme_Keyword_Thesaurus: NASA GCMD Earth Science Keywords Thesaurus
Theme_Keyword: earth science
Theme_Keyword: paleoclimate
Theme_Keyword: ocean/lake records
Theme_Keyword: stratigraphic sequence

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: U-Pb
Theme_Keyword: detrital zircon

Place:

Place_Keyword_Thesaurus: USGS Geographic Names Information System (GNIS)
Place_Keyword: Alaska
Place_Keyword: North Slope
Place_Keyword: Brooks Range

Access_Constraints: None
Use_Constraints:

It is requested that the authors and the USGS Alaska Science Center be cited for any subsequent publications that reference this dataset.

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: 4210 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Country: USA

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

Cross_Reference:

Citation_Information:

Originator: Lease, R.O. (ORCID: 0000-0003-2582-8966)
Originator: Houseknecht, D.W. (ORCID: 0000-0002-9633-6910)
Originator: Kylander-Clark, A.R.C. (ORCID: 0000-0003-1393-3531)
Publication_Date: 2022
Title:

Quantifying large-scale continental shelf margin growth and dynamics across mid-Cretaceous Arctic Alaska with detrital zircon U-Pb dating

Geospatial_Data_Presentation_Form: journal article
Series_Information:

Series_Name: Geology
Issue_Identification: 50(5):620–625

Publication_Information:

Publication_Place: online
Publisher: Geological Society of America

Other_Citation_Details:

Lease, R.O., Houseknecht, D.W., and Kylander-Clark, A.R.C., 2022, Quantifying large-scale continental shelf margin growth and dynamics across mid-Cretaceous Arctic Alaska with detrital zircon U-Pb dating: Geology 50(5):620–625 doi:10.1130/G49118.1

Online_Linkage: https://doi.org/10.1130/G49118.1

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The sample zircons were run with both primary and secondary zircon standards.

Logical_Consistency_Report:

No unexpected values are used in the analytical data. There are blank cells present in the tables. This dataset includes samples from both outcrop and well core. The outcrop samples do not have API_WellNo, nor sample depth information.

Completeness_Report: This data set is complete; no data were omitted.
Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Horizontal positions of exploration wells are reported by the Alaska Oil and Gas Conservation Commission https://www.commerce.alaska.gov/web/aogcc The NAD27 coordinates have been transformed to WGS84. The outcrop samples were located in the field with a handheld GPS with a horizontal accuracy of less than 5 meters.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Kylander-Clark, A.R.C.
Originator: Hacker, B.R.
Originator: Cottle, J.M.
Publication_Date: 2013
Title: Laser-ablation split-stream ICP petrochronology
Geospatial_Data_Presentation_Form: publication
Series_Information:

Series_Name: Chemical Geology
Issue_Identification: 345:99-112

Publication_Information:

Publication_Place: online
Publisher: Elsevier

Other_Citation_Details:

Kylander-Clark, A.R.C., Hacker, B.R., and Cottle, J.M., 2013, Laser-ablation split-stream ICP petrochronology, Chemical Geology 345:99-112, https://doi.org/10.1016/j.chemgeo.2013.02.019

Online_Linkage: https://doi.org/10.1016/j.chemgeo.2013.02.019

Type_of_Source_Media: publication
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2013

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Kylander-Clark and others, 2013
Source_Contribution: Description of analytical procedures for zircon U/Pb analyses

Source_Information:

Source_Citation:

Citation_Information:

Originator: Paton, C.
Originator: Woodhead, J.D.
Originator: Hellstrom, J.C.
Originator: Hergt, J.M.
Originator: Greig, A.
Originator: Maas, R.
Publication_Date: 20100326
Title:

Improved Laser Ablation U-Pb Zircon Geochronology through Robust Downhole Fractionation Correction

Geospatial_Data_Presentation_Form: publication
Series_Information:

Series_Name: Geochemistry, Geophysics, Geosystems
Issue_Identification: 11(3):Q0AA06

Publication_Information:

Publication_Place: online
Publisher: American Geophysical Union (AGU)

Other_Citation_Details:

Paton, C., Woodhead, J.D., Hellstrom, J.C., Hergt, J.M., Greig, A., and Mass, R., 2010, Improved Laser Ablation U-Pb Zircon Geochronology through Robust Downhole Fractionation Correction, Geochemistry, Geophysics, Geosystems 11(3):Q0AA06, https://doi.org/10.1029/2009GC002618

Online_Linkage: https://doi.org/10.1029/2009GC002618

Type_of_Source_Media: publication
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2010

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Paton and others, 2010
Source_Contribution:

Description of data reduction procedures for zircon U/Pb analyses

Source_Information:

Source_Citation:

Citation_Information:

Originator: Ludwig, K.R.
Publication_Date: 2012
Title: Isoplot 3.75: A geochronological Toolkit for Microsoft Excel
Geospatial_Data_Presentation_Form: publication
Series_Information:

Series_Name: Berkeley Geochronology Center Special Publication
Issue_Identification: no. 5

Online_Linkage:

https://www.geocalculate.com/wp-content/uploads/2019/10/Isoplot3_75-4_15manual.pdf

Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2012

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Ludwig, 2012
Source_Contribution:

Description of age calculation procedures for zircon U/Pb analyses

Process_Step:

Process_Description:

Zircon mineral separation was performed using standard crushing, magnetic, and heavy liquid procedures. Random representative splits of detrital zircon grains were mounted for sandstone samples, whereas pristine zircon grains were hand-picked for the volcanic ash sample. Grains were mounted in epoxy and sanded and polished for analysis by laser-ablation inductively coupled plasma mass spectrometry (LA-ICPMS).

Process_Date: 2018

Process_Step:

Process_Description:

LA-ICPMS analyses were performed at the University of California, Santa Barbara using a Photon Machines Analyte 193-nm Excimer laser and Nu Instruments Plasma HR MC-ICPMS using standard methodology (Kylander-Clark and others, 2013). Analyses targeted the cores of randomly-selected detrital zircon grains that were free of cracks and inclusions using a spot size of 15 um and repetition rate of 4 Hz. The 91500 reference zircon was used as the primary standard and GJ1, Plesovice, and Peixe were used as secondary standards to monitor data accuracy. Data reduction was performed using the Iolite software (Paton and others, 2010) and age calculations were performed using Isoplot (Ludwig, 2012).

Process_Date: 2018

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0001
Longitude_Resolution: 0.0001
Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

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

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: geology_UPbGeochronology_NorthSlope_lease_2021.csv
Entity_Type_Definition:

Table of U-Pb zircon LA_ICPMS data, reporting the concentration of the radioactive elements uranium (U) and thorium (Th) measured in each grain, ratios of two isotopes of lead (207Pb and 206Pb) to two isotopes of uranium (235U and 238U), and the geologic ages of each grain calculated from the isotope ratios. The table is presented in comma separated value (CSV) format.

Entity_Type_Definition_Source: Author defined

Attribute:

Attribute_Label: Sample_Site
Attribute_Definition:

Either the name of exploration well from which sample was collected, or the sample number assigned when the sample was collected in the field. Value is repeated because many individual zircon grains from each sample were analyzed.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

If Sample_Site is a well, the attribute is the name of the exploration well from which the sample was collected. If Sample_Site is a field identifier, most labels consist of the last two digits of the year when collected, an abbreviation identifying the collector, and a number.

Attribute:

Attribute_Label: Sample_Depth_Top
Attribute_Definition:

The measured top depth of sampling horizon in exploration well core. Blank cells are present and represent outcrop samples.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1637
Range_Domain_Maximum: 5552
Attribute_Units_of_Measure: feet

Attribute:

Attribute_Label: Sample_Depth_Base
Attribute_Definition:

The measured base depth of sampling horizon in exploration well core. Blank cells are present and represent outcrop samples.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1664
Range_Domain_Maximum: 5562
Attribute_Units_of_Measure: feet

Attribute:

Attribute_Label: Mineral
Attribute_Definition: Material analyzed
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: DZ
Enumerated_Domain_Value_Definition: detrital zircon
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: VZ
Enumerated_Domain_Value_Definition: volcanic ash zircon
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute:

Attribute_Label: Analysis_Name
Attribute_Definition:

Unique lab identifier for an individual analysis from a field sample or a specific sample well and depth.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Combination of text and numbers. Often, but not always, the Analysis_Name consists of an abbreviation of the well name or sample identifier, a number related to the sample depth, and a number or number and letter code.

Attribute:

Attribute_Label: U_conc
Attribute_Definition: Concentration of uranium (U), in parts per million (ppm)
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 10
Range_Domain_Maximum: 5170
Attribute_Units_of_Measure: ppm

Attribute:

Attribute_Label: Th_conc
Attribute_Definition: Concentration of thorium (Th), in parts per million (ppm)
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 4820
Attribute_Units_of_Measure: ppm

Attribute:

Attribute_Label: 206Pb_238U_Ratio
Attribute_Definition:

Ratio of 206Pb/238U, or lead isotope 206 divided by uranium isotope 238

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.0111
Range_Domain_Maximum: 0.7540
Attribute_Units_of_Measure: this is a unit-less value

Attribute:

Attribute_Label: 206Pb_238U_Unc
Attribute_Definition: Value is 2-sigma uncertainty for the ratio of 206Pb/238U
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.0002
Range_Domain_Maximum: 0.0402
Attribute_Units_of_Measure: this is a unit-less value

Attribute:

Attribute_Label: 207Pb_206Pb_Ratio
Attribute_Definition:

Ratio 207Pb/206Pb, or lead isotope 207 divided by lead isotope 206

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.0439
Range_Domain_Maximum: 0.4200
Attribute_Units_of_Measure: this is a unit-less value

Attribute:

Attribute_Label: 207Pb_206Pb_Unc
Attribute_Definition:

Value is error correlation of 2-sigma uncertainty on 206Pb/238U and 207Pb/206Pb ratios.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.0006
Range_Domain_Maximum: 0.0661
Attribute_Units_of_Measure: this is a unit-less value

Attribute:

Attribute_Label: Error_Correlation
Attribute_Definition:

Value is error correlation of 2-sigma uncertainty on 206Pb/238U and 207Pb/206Pb ratios.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.00
Range_Domain_Maximum: 1.00
Attribute_Units_of_Measure: this is a unit-less value

Attribute:

Attribute_Label: 207Pb_235U_Ratio
Attribute_Definition:

Ratio of 207Pb/235U, or lead isotope 207 divided by uranium isotope 235

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.079
Range_Domain_Maximum: 35.070
Attribute_Units_of_Measure: this is a unit-less value

Attribute:

Attribute_Label: 207Pb_235U_Unc
Attribute_Definition: Value is 2-sigma uncertainty for the ration 207Pb/235U.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.001
Range_Domain_Maximum: 2.714
Attribute_Units_of_Measure: this is a unit-less value

Attribute:

Attribute_Label: 206Pb_238U_Age
Attribute_Definition:

Age in millions of years (Ma) calculated from the ratio of 206Pb/238U

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 70.6
Range_Domain_Maximum: 3358.8
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: 206Pb_238U_Age_Unc
Attribute_Definition:

Value is 2-sigma uncertainty in millions of years (Ma) for the age calculated from the ratio of 206Pb/238U.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1.1
Range_Domain_Maximum: 3584.3
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: 207Pb_206Pb_Age
Attribute_Definition:

Age in millions of years (Ma) calculated from the ratio of 207Pb/206Pb

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -116
Range_Domain_Maximum: 3982
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: 207Pb_206Pb_Age_Unc
Attribute_Definition:

Value is 2-sigma uncertainty in millions of years (Ma) for the age calculated from the ratio of 207Pb/206Pb.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 17
Range_Domain_Maximum: 680
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: 207Pb_235U_Age
Attribute_Definition:

Age in millions of years (Ma) calculated from the ratio of 207Pb/235U

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 77
Range_Domain_Maximum: 3641
Attribute_Units_of_Measure: Ma, millions of years

Attribute:

Attribute_Label: 207Pb_235U_Age_Unc
Attribute_Definition:

Value is 2-sigma uncertainty in millions of years (Ma) for the age calculated

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 2
Range_Domain_Maximum: 716
Attribute_Units_of_Measure: Ma, millions of years

Detailed_Description:

Entity_Type:

Entity_Type_Label: geology_SampleLocations_NorthSlope_lease_2021.csv
Entity_Type_Definition:

Table of sample identifiers, well names, API well numbers, and locations of wells and outcrop samples.

Entity_Type_Definition_Source: Author defined

Attribute:

Attribute_Label: Sample_Site
Attribute_Definition:

Either the name of the exploration well from which the sample was collected, or the sample number assigned when the outcrop sample was collected in the field. Same as Sample_Site in table geology_UPbGeochronology_NorthSlope_Lease_2021.csv.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Attribute:

Attribute_Label: Sample_Type
Attribute_Definition: Identifies if Sample_Site is a well or an outcrop sample.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: outcrop
Enumerated_Domain_Value_Definition: sample was collected from natural outcrop
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: well
Enumerated_Domain_Value_Definition:

sample was collected from archived well core material from oil exploration wells

Enumerated_Domain_Value_Definition_Source: Author defined

Attribute:

Attribute_Label: API_WellNo
Attribute_Definition:

Unique 14 character well identifier. Blank cells are present and represent outcrop samples.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: 14 character code assigned by Alaska Division of Oil and Gas

Attribute:

Attribute_Label: Lat_WGS84
Attribute_Definition:

Latitude of the location of the outcrop sample collection or the wellhead, in decimal degrees, datum WGS84. The wellhead location was provided in datum NAD27 but has been transformed to WGS84.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 69.1288
Range_Domain_Maximum: 71.4182
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: Long_WGS84
Attribute_Definition:

Longitude of the location of the outcrop sample collection or the wellhead, in decimal degrees, datum WGS84. The wellhead location was provided in datum NAD27 but has been transformed to WGS84.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -165.5449
Range_Domain_Maximum: -144.6123
Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: Comment
Attribute_Definition:

Additional sample description which may include more detailed rock description and geologic unit. Blank cells are present.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Additional sample description which may include more detailed rock description, location, and/or geologic unit.

U-Pb Isotopic Data and Ages of Detrital Zircon and Volcanic Zircon Grains from the Torok and Nanushuk Formations, Arctic Alaska, 2021

Metadata: