USAP-DC

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Development of Quantitative Weathering Indicators in Proximal Alluvial Sediments to Assess Glacial Activity in the Rock Record Description/Abstract The proposed research seeks to test the hypothesis that chemical and physical weathering in proximal alluvial systems will show systematic and measurable variations between glacial and nonglacial systems. To accomplish this, the investigation will attempt to quantify the natural variation of chemical and physical weathering in granitoid-sourced proximal alluvial sediments in end-member glacial and nonglacial systems, when other, "non-climatic" factors (e.g. provenance, drainage basin area and relief, sample grain size, sediment facies) are controlled. If chemical weathering in the proposed hot-humid, hot-arid, hot semi-arid nonglacial systems and the cool-wet, cold semi-arid, and cold-arid glacial systems show systematic variations, then chemical indices may be used to help differentiate paleoclimatic conditions. Continued reliance on students provides a broader impact of this proposed research and firmly grounds this effort in its educational mission. Personnel Person Role Soreghan, Gerilyn Investigator Elwood Madden, Megan Co-Investigator Funding Antarctic Earth Sciences Award # 0842639 AMD - DIF Record(s) NSF-ANT08-42639_1 Data Management Plan None in the Database Product Level: 1 (processed data) Datasets Repository Title (link) Format(s) Status USAP-DC Development of Quantitative Weathering Indicators in Proximal Alluvial Sediments to Assess Glacial Activity in the Rock Record None exist Publications Marra, K. R., Elwood Madden, M. E., Soreghan, G. S., & Hall, B. L. (2017). Chemical weathering trends in fine-grained ephemeral stream sediments of the McMurdo Dry Valleys, Antarctica. Geomorphology, 281, 13–30. (doi:10.1016/j.geomorph.2016.12.016) Marra, K. R., Elwood Madden, M. E., Soreghan, G. S., & Hall, B. L. (2015). BET surface area distributions in polar stream sediments: Implications for silicate weathering in a cold-arid environment. Applied Geochemistry, 52, 31–42. (doi:10.1016/j.apgeochem.2014.11.005) Platforms and Instruments