USAP-DC

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Antarctica's Geological History Reflected in Sedimentary Radiogenic Isotopes Description/Abstract This project studies sediment from the ocean floor to understand Antarctica's geologic history. Glacially eroded from the Antarctic continent, these sediments may offer insight into the 99% Antarctica covered by ice. The work's central focus is determining crust formation ages and thermal histories for three key areas of East Antarctica--Prydz Bay, eastern Weddell Sea, and Wilkes Land--through a combination of petrography, bulk sediment geochemistry and radiogenic isotopes, as well as isotope chronology of individual mineral grains. One specific objective is characterizing the composition of the Gamburtsev Mountains through studies of Eocene fluvial sediments from Prydz Bay. In addition to furthering our understanding of the hidden terrains of Antarctica, these terrigenous sediments will also serve as a natural laboratory to evaluate the effects of continental weathering on the Hf/Nd isotope systematics of seawater. An important broader impact of the project is providing exciting research projects for graduate and postdoctoral students using state of the art techniques in geochemistry. Personnel Person Role Van De Flierdt, Christina-Maria Co-Investigator Goldstein, Steven L. Co-Investigator Hemming, Sidney R. Investigator Funding Antarctic Earth Sciences Award # 0538580 AMD - DIF Record(s) NSF-ANT05-38580 Data Management Plan None in the Database Product Level: Not provided Datasets Repository Title (link) Format(s) Status USAP-DC Antarctica's Geological History Reflected in Sedimentary Radiogenic Isotopes None 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) Pierce, E. L., Hemming, S. R., Williams, T., van de Flierdt, T., Thomson, S. N., Reiners, P. W., … Goldstein, S. L. (2014). A comparison of detrital U–Pb zircon, 40Ar/39Ar hornblende, 40Ar/39Ar biotite ages in marine sediments off East Antarctica: Implications for the geology of subglacial terrains and provenance studies. Earth-Science Reviews, 138, 156–178. (doi:10.1016/j.earscirev.2014.08.010) Platforms and Instruments