Late Quaternary fluvial terraces near the Daocheng Ice Cap,eastern Tibetan Plateau |
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| Institution: | 1. Department of Vegetation Ecology, Institute of Botany, Academy of Sciences of the Czech Republic, Lidická 25/27, CZ-602 00 Brno, Czech Republic;2. Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlá?ská 2, CZ-61137 Brno, Czech Republic;1. Laboratoire Chrono-Environnement, UMR 6249 CNRS, Université de Franche-Comté, 16 route de Gray, 25030 Besançon Cedex, France;2. Institut National de la Recherche Scientifique, Centre Eau Terre et Environnement, 490 rue de la Couronne, Quebec, QC G1K 9A9, Canada;1. Paleoecological Environmental Assessment and Research Laboratory (PEARL), Department of Biology, Queen''s University, Kingston, Ontario K7L3N6, Canada;2. Department of Biology, University of Regina, Laboratory Building, Saskatchewan S4S0A2, Canada;1. Florida Museum of Natural History, University of Florida, Gainesville, FL 32611, USA;2. School of Earth Sciences & Environmental Sustainability, Northern Arizona University, Flagstaff, AZ 86011, USA;3. Geosciences Institute, Johannes Gutenberg University, Johann-Joachim-Becher-Weg 21, Mainz 55128, Germany;4. Rubicon Geological Consultants, 1690 Sharkey Rd., Morehead, KY 40351, USA;5. Instituto de Biociências, Universidade Estadual Paulista, Distrito de Rubião Junior, CP. 510, 18618-970 Botucatu, Brazil;6. Department of Geological Sciences, University of Missouri, Columbia, MO 65211, USA;7. Department of Geology, University of Cincinnati, Cincinnati, OH 45221, USA;8. Department of Earth and Environmental Sciences, University of Kentucky, Lexington, KY 40506, USA;1. The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Edmond J. Safra Campus Givat Ram, Jerusalem 91904, Israel;2. CEREGE, UMR 6635 CNRS-Aix-Marseille University, BP 80, 13 545 Aix en Provence Cedex 4, France;3. Geological Survey of Israel, 30 Malkhe Israel St., Jerusalem 95501, Israel;4. Department of Geography, The Hebrew University of Jerusalem, Mt. Scopus, Jerusalem 91905, Israel;5. Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94511, USA |
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| Abstract: | The timing of terrace formation relative to the glacial–interglacial cycle and what factors control that timing, such as changes in climate and/or uplift, are controversial. Here we present a study of the terraces along the Yazheku River using electron spin resonance (ESR) dating and analysis of the sedimentary characteristics in order to establish the timing of terrace formation and to assess the forcing mechanisms that have been proposed. The Yazheku River flows in glacial trough leading from the Haizi Shan, on the eastern Tibetan Plateau. The range was uplifted during the Quaternary and repeatedly glaciated by ice caps. The four highest major terraces (T5, T4, T3, and T2) are the result of both climatic and tectonic influences. Strath terraces T5–T2 were created during Haizi Shan glacial expansions during MIS 16, 12, 6 and 3–4, respectively. The major aggradation phases of the four terraces occurred during the deglaciations at the ends of MIS 16, 12, 6, and 2. Down-cutting, which led to the generation of the four terraces, immediately followed the deposition of the T5–T2 gravel units. These incisions occurred during the transitions between MIS 16–15, MIS 12–11, MIS 6–5, and MIS 2–1. |
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