{"dp_type": "Dataset", "free_text": "Argon-Argon Dates"}
[{"awards": "2019719 Brook, Edward", "bounds_geometry": null, "date_created": "Thu, 02 Apr 2026 00:00:00 GMT", "description": "Dataset that includes 40 Ar atm and \u03b418O data from Allan Hills ice cores ALHIC2301, ALHIC2302, and ALHIC2201. 40Ar atm dating method is based on the deficit of radiogenic 40 Ar in ancient ice sample compared to the modern atmosphere as a standard (Bender et al., 2008). The argon isotope ratios (\u03b440Ar/36Ar, \u03b440Ar/38Ar and \u03b438Ar/36Ar ) were analysed using the MAT253plus with Dual Inlet systems. The \u03b440Ar/38Ar was corrected from gravitational settling or fractionation occuring in the firn using \u03b438Ar/36Ar to get the 40Ar atm. The amount of 40Ar atm divided by the degassing rate of radiogenic 40Ar into atmosphere gives the Argon age of the sample. The \u03b440Ar/38Ar was corrected from gravitational settling /fractionation occuring in the firn using \u03b438Ar/36Ar to get the 40Ar atm. The amount of 40Ar atm divided by the degassing rate of radiogenic 40Ar into atmosphere gives the Argon age of the sample. All \u03b418\u039f data were analyzed using either a Picarro L2130-i or a L2140-i cavity-ring-down laser spectrometer, calibrated to the VSMOW-SLAP scale using references waters previously calibration to the VSMOW and SLAP international standards. Precision and accuracy (one standard deviation), based on independent analysis of a quality-control reference water, is \u003c0.1\u2030.", "east": null, "geometry": null, "keywords": "Allan Hills; Allan Hills Blue Ice; Antarctica; Argon-Argon Dates; Cryosphere; Water Isotopes", "locations": "Allan Hills; Antarctica", "north": null, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Higgins, John; Hishamunda, Valens; Kirkpatrick, Liam; Steig, Eric J.", "project_titles": "Center for Oldest Ice Exploration", "projects": [{"proj_uid": "p0010321", "repository": "USAP-DC", "title": "Center for Oldest Ice Exploration"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "COLDEX", "south": null, "title": "40Ar-atm and \u03b418O data for Allan Hills ice cores ALHIC 2301, ALHIC 2302, ALHIC 2201", "uid": "602044", "west": null}, {"awards": "1745015 Zimmerer, Matthew", "bounds_geometry": ["POLYGON((-127.10701 -77.161919,-127.0824042 -77.161919,-127.0577984 -77.161919,-127.0331926 -77.161919,-127.0085868 -77.161919,-126.983981 -77.161919,-126.9593752 -77.161919,-126.9347694 -77.161919,-126.9101636 -77.161919,-126.8855578 -77.161919,-126.860952 -77.161919,-126.860952 -77.1703043,-126.860952 -77.1786896,-126.860952 -77.1870749,-126.860952 -77.1954602,-126.860952 -77.2038455,-126.860952 -77.2122308,-126.860952 -77.2206161,-126.860952 -77.2290014,-126.860952 -77.2373867,-126.860952 -77.245772,-126.8855578 -77.245772,-126.9101636 -77.245772,-126.9347694 -77.245772,-126.9593752 -77.245772,-126.983981 -77.245772,-127.0085868 -77.245772,-127.0331926 -77.245772,-127.0577984 -77.245772,-127.0824042 -77.245772,-127.10701 -77.245772,-127.10701 -77.2373867,-127.10701 -77.2290014,-127.10701 -77.2206161,-127.10701 -77.2122308,-127.10701 -77.2038455,-127.10701 -77.1954602,-127.10701 -77.1870749,-127.10701 -77.1786896,-127.10701 -77.1703043,-127.10701 -77.161919))"], "date_created": "Mon, 25 Aug 2025 00:00:00 GMT", "description": "This dataset includes data for the Ar/Ar analyses of samples collected during the 2018-2019 field season at Mt. Waesche. All analyses were conducted in the New Mexico Geochronology Research Laboratory at the New Mexico Bureau of Geology and Mineral Resources. Samples dated are from lava flows and eruptive centers on the southern flank of the volcano. Material dated includes groundmass concentrate, anorthoclase, and plagioclase. A total of 133 ages, ranging from 94.6 \u00b1 12.1 to 425.9 \u00b1 4.8 ka, were generated as part of the project. This data set includes raw isotope values, corrected isotope values (for blank and baseline measurements, decay, and detector intercalibration), calculated ratios, standards and reference gases values, and monitor information. Additional information related to age calculations, sample preparation, irradiation, instrumentation, and analytical parameters is also provided.", "east": -126.860952, "geometry": ["POINT(-126.983981 -77.2038455)"], "keywords": "Antarctica; Argon-Argon Dates; Argon Isotopes; Cryosphere; Executive Committee Range; Geochronology; Glaciers/ice Sheet; Glaciers/Ice Sheet; Marie Byrd Land; Mount Waesche; Volcano; West Antarctic", "locations": "Antarctica; West Antarctic; Mount Waesche; Marie Byrd Land; Executive Committee Range", "north": -77.161919, "nsf_funding_programs": "Antarctic Earth Sciences", "persons": "Zimmerer, Matthew; Dunbar, Nelia; McIntosh, William C; Iverson, Nels; Burril, C.", "project_titles": "Collaborative Research: Constraining West Antarctic Ice Sheet elevation during the last interglacial", "projects": [{"proj_uid": "p0010272", "repository": "USAP-DC", "title": "Collaborative Research: Constraining West Antarctic Ice Sheet elevation during the last interglacial"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.245772, "title": "Ar/Ar data for samples collected during the 2018-2019 Mt. Waesche field season.", "uid": "601974", "west": -127.10701}]
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| Dataset Title/Abstract/Map | NSF Award(s) | Date Created | PIs / Scientists | Project Links | Abstract | Bounds Geometry | Geometry | Selected | Visible |
|---|---|---|---|---|---|---|---|---|---|
|
40Ar-atm and δ18O data for Allan Hills ice cores ALHIC 2301, ALHIC 2302, ALHIC 2201
|
2019719 |
2026-04-02 | Higgins, John; Hishamunda, Valens; Kirkpatrick, Liam; Steig, Eric J. |
Center for Oldest Ice Exploration |
Dataset that includes 40 Ar atm and δ18O data from Allan Hills ice cores ALHIC2301, ALHIC2302, and ALHIC2201. 40Ar atm dating method is based on the deficit of radiogenic 40 Ar in ancient ice sample compared to the modern atmosphere as a standard (Bender et al., 2008). The argon isotope ratios (δ40Ar/36Ar, δ40Ar/38Ar and δ38Ar/36Ar ) were analysed using the MAT253plus with Dual Inlet systems. The δ40Ar/38Ar was corrected from gravitational settling or fractionation occuring in the firn using δ38Ar/36Ar to get the 40Ar atm. The amount of 40Ar atm divided by the degassing rate of radiogenic 40Ar into atmosphere gives the Argon age of the sample. The δ40Ar/38Ar was corrected from gravitational settling /fractionation occuring in the firn using δ38Ar/36Ar to get the 40Ar atm. The amount of 40Ar atm divided by the degassing rate of radiogenic 40Ar into atmosphere gives the Argon age of the sample. All δ18Ο data were analyzed using either a Picarro L2130-i or a L2140-i cavity-ring-down laser spectrometer, calibrated to the VSMOW-SLAP scale using references waters previously calibration to the VSMOW and SLAP international standards. Precision and accuracy (one standard deviation), based on independent analysis of a quality-control reference water, is <0.1‰. | [] | [] | false | false |
|
Ar/Ar data for samples collected during the 2018-2019 Mt. Waesche field season.
|
1745015 |
2025-08-25 | Zimmerer, Matthew; Dunbar, Nelia; McIntosh, William C; Iverson, Nels; Burril, C. |
Collaborative Research: Constraining West Antarctic Ice Sheet elevation during the last interglacial |
This dataset includes data for the Ar/Ar analyses of samples collected during the 2018-2019 field season at Mt. Waesche. All analyses were conducted in the New Mexico Geochronology Research Laboratory at the New Mexico Bureau of Geology and Mineral Resources. Samples dated are from lava flows and eruptive centers on the southern flank of the volcano. Material dated includes groundmass concentrate, anorthoclase, and plagioclase. A total of 133 ages, ranging from 94.6 ± 12.1 to 425.9 ± 4.8 ka, were generated as part of the project. This data set includes raw isotope values, corrected isotope values (for blank and baseline measurements, decay, and detector intercalibration), calculated ratios, standards and reference gases values, and monitor information. Additional information related to age calculations, sample preparation, irradiation, instrumentation, and analytical parameters is also provided. | ["POLYGON((-127.10701 -77.161919,-127.0824042 -77.161919,-127.0577984 -77.161919,-127.0331926 -77.161919,-127.0085868 -77.161919,-126.983981 -77.161919,-126.9593752 -77.161919,-126.9347694 -77.161919,-126.9101636 -77.161919,-126.8855578 -77.161919,-126.860952 -77.161919,-126.860952 -77.1703043,-126.860952 -77.1786896,-126.860952 -77.1870749,-126.860952 -77.1954602,-126.860952 -77.2038455,-126.860952 -77.2122308,-126.860952 -77.2206161,-126.860952 -77.2290014,-126.860952 -77.2373867,-126.860952 -77.245772,-126.8855578 -77.245772,-126.9101636 -77.245772,-126.9347694 -77.245772,-126.9593752 -77.245772,-126.983981 -77.245772,-127.0085868 -77.245772,-127.0331926 -77.245772,-127.0577984 -77.245772,-127.0824042 -77.245772,-127.10701 -77.245772,-127.10701 -77.2373867,-127.10701 -77.2290014,-127.10701 -77.2206161,-127.10701 -77.2122308,-127.10701 -77.2038455,-127.10701 -77.1954602,-127.10701 -77.1870749,-127.10701 -77.1786896,-127.10701 -77.1703043,-127.10701 -77.161919))"] | ["POINT(-126.983981 -77.2038455)"] | false | false |
