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Late Pleistocene environmental information on the Diexi paleo-dammed lake of the upper Minjiang River in the eastern margin of the Tibetan Plateau, China

引用

Journal of Mountain Science 2020年第5期17卷 1172-1187页

作者： WANG Lan-sheng WANG Xiao-qun SHEN Jun-hui YIN Guan CUI Jie XU Xiang-ning ZHANG Zhi-long WAN Tao WEN Li-wang State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China College of Environment geology and Civil Engineering Chengdu University of TechnologyChengdu 610059China College of Earth Sciences Chengdu University of TechnologyChengdu 610059China School of Environment and Resource Southwest University of Science and TechnologyMianyang 621010China Sichuan Bureau of Geology and Mineral Exploration Chengdu 610000China College of Water Resource and Hydropower Sichuan University Chengdu 610000China College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059China

In 1999, Diexi paleo-dammed lake(2349 m a.s.l.) was discovered around Diexi town along the Minjiang River in Sichuan province. Diexi is located where the eastern edge of the Tibetan Plateau and the Sichuan Basin meet. The dammed lake was formed during the Last Glacial Maximum of the Late Pleistocene(~30,000 years ago) and began to empty about 15,000 years ago. The lacustrine sediments(up to 240 m thick) preserve abundant paleoenvironment information. In this paper, a mass of oxygen isotopes and 14 C dating from drilled cores are analyzed and discussed. The δ18 O curve on the paleo climate from this section is comparable with the coeval paleo climatic curves of ice cores and karsts in China and others. Furthermore, the physical model testing has confirmed that the disturbed zones in the core are caused by strong earthquakes occurred at least 10 times, which implies strong crustal deformation, as an important driving force, affecting climate change. This study provides a new window to observe East Asian monsoon formation, paleoenvironmental evolution and the global climate change.

关键词： Late Pleistocene paleo-dammed lake paleo climate Earthquake Minjiang River Diexi

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