USAP-DC

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Erosion History and Sediment Provenance of East Antarctica from Multi-method Detrital Geo- and Thermochronology Data DOI: https://doi.org/10.15784/600093 Cite as Gehrels, G., Reiners, P., & Thomson, S. (2012) "Erosion History and Sediment Provenance of East Antarctica from Multi-method Detrital Geo- and Thermochronology" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/600093. AMD - DIF Record(s) NSF-ANT08-38722_1 Abstract 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. Creator(s): Gehrels, George; Reiners, Peter; Thompson, Stuart Date Created: 2012-01-01 Repository: USAP-DC (current) - LDEO-LEGACY (original) License: Creative Commons Attribution-NonCommercial v4.0 Generic [CC BY-NC 4.0] Spatial Extent(s) West: 61.9, East: 75.08, South: -73.7, North: -67.28 Temporal Extent(s) Start: 2009-06-15 - End: 2012-05-31 Award(s) NSF 0838722 Version: 1 Related Project(s) Collaborative Research: Erosion History and Sediment Provenance of East Antarctica from Multi-method Detrital Geo- and Thermochronology Keywords Antarctica Fission Track Thermochronology Gamburtsev Mountains Geochronology Marine Sediments NBP0101 ODP1166 ODP739 Prydz Bay Solid Earth Southern Ocean