USAP-DC

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Collaborative Research: Erosion History and Sediment Provenance of East Antarctica from Multi-method Detrital Geo- and Thermochronology Description/Abstract This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Much of the inventory of East Antarctic bedrock geochronology, as well as a record of its erosional history, is preserved in Cenozoic sediments around its margin. This project is to use these sediments to understand their sub-ice provenance and the erosional history of the shield by measuring ages of multiple geo- and thermochronometers on single detrital crystals and on multiple crystals in detrital clasts (U/Pb, fission-track, and (U-Th)/He dating of zircon and apatite, and 40Ar/39Ar dating of hornblende, mica, and feldspar). The combination of multi-chronometer ages in single grains and clasts provides a powerful fingerprint of bedrock sources, allowing us to trace provenance in Eocene fluvial sandstones through Quaternary diamicts around the margin. Multiple thermochronometric (cooling) ages in the same grains and clasts also allows us to interpret the timing and rates of erosion from these bedrock sources. Delineating a distribution of bedrock age units, their sediment transport connections, and their erosional histories over the Cenozoic, will in turn allow us to test tectonic models bearing on: (1) the origin of the Gamburtsev Subglacial Mountains, (2) fluvial and topographic evolution, and (3) the history of glacial growth and erosion. Personnel Person Role Reiners, Peter Investigator Gehrels, George Co-Investigator Thompson, Stuart Co-Investigator Hemming, Sidney R. Investigator Funding Antarctic Earth Sciences Award # 0838729 Antarctic Earth Sciences Award # 0838722 AMD - DIF Record(s) NSF-ANT08-38722_1 NSF-ANT08-38729_1 Data Management Plan None in the Database Product Level: 1 (processed data) Datasets Repository Title (link) Format(s) Status USAP-DC Erosion History and Sediment Provenance of East Antarctica from Multi-method Detrital Geo- and Thermochronology Excel exist USAP-DC Erosion History and Sediment Provenance of East Antarctica from Multi-method Detrital Geo- and Thermochronology Excel exist Publications Licht, K. J., & Hemming, S. R. (2017). Analysis of Antarctic glacigenic sediment provenance through geochemical and petrologic applications. Quaternary Science Reviews, 164, 1–24. (doi:10.1016/j.quascirev.2017.03.009) Welke, B., Licht, K., Hennessy, A., Hemming, S., Pierce Davis, E., & Kassab, C. (2016). Applications of detrital geochronology and thermochronology from glacial deposits to the Paleozoic and Mesozoic thermal history of the Ross Embayment, Antarctica. Geochemistry, Geophysics, Geosystems, 17(7), 2762–2780. (doi:10.1002/2015gc005941) Platforms and Instruments LABORATORY