10Be surface-exposure age dating of the Last Glacial Maximum in the northern Pamir (Tajikistan) |
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| Institution: | 1. Department of Geology, University of Cincinnati, Cincinnati, OH 45221, USA;2. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;3. Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77004, USA;4. China Earthquake Disaster Prevention Center, Beijing 100029, China;5. Division of Natural Sciences, University of Houston – Clear Lake, Houston, TX 77058, USA;6. Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA;7. Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN 47907, USA;8. Department of Earth Sciences, University of Toronto, Toronto, ON, 55S 3B1, Canada |
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| Abstract: | Knowledge of the spatial and temporal variations in Alpine glaciations is essential for reconstructing the regional and global timing of ice ages. This study investigates glacial deposits at the mouth of the Muksu catchment in the northern Pamir using 10Be surface-exposure age dating. We sampled boulders from the furthest downstream recessional moraine (20 samples) and five lateral moraines (41 samples) near the former terminus of the Fedchenko Glacier, the longest (∼72 km) present-day Alpine glacier of the Pamir. After the identification of outliers, the boulder population of the recessional moraine yielded a mean exposure age of 17.5 ± 1.9 ka. The maximum exposure age of the lateral moraines, collected ∼5 km up-valley of the recessional moraine, is 18.2 ± 1.7 ka. The boulder ages reflect glacial deposition during the Last Glacial Maximum (Marine Isotope Stage 2) in the region; they are in accordance with published glacial deposition ages in the western Tian Shan. |
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| Keywords: | Moraine Cosmogenic radionuclides Exposure-age dating Last glacial maximum Pamir Fedchenko Glacier |
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