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

最小化 最大化

Vol17 No.5: 1172-1187

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

Author】WANG Lan-sheng1,2; WANG Xiao-qun1,2 ; SHEN Jun-hui1,2*; YIN Guan3; CUI Jie4; XU Xiang-ning5; ZHANG Zhi-long6; WAN Tao1,7; WEN Li-wang1,2

Addresses】1 State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China; 2 College of Environment geology and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China; 3 College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China; 4 School of Environment and Resource ,Southwest University of Science and Technology, Mianyang 621010, China; 5 Sichuan Bureau of Geology and Mineral Exploration, Chengdu 610000, China; 6 College of Water Resource and Hydropower, Sichuan University Chengdu 610000, China; 7 College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China

Corresponding author】SHEN Jun-hui

Citation】Wang LS, Wang XQ, Shen JH, et al. (2020) Late Pleistocene environmental information on the Diexi paleo-dammed lake of the upper Minjiang River in the eastern margin of the Tibetan Plateau, China. Journal of Mountain Science 17(5). https://doi.org/10.1007/s11629-019-5573-x

DOI】https://doi.org/10.1007/s11629-019-5573-x

Abstract】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 paleo-environment information. In this paper, a mass of oxygen isotopes and 14C dating from drilled cores are analyzed and discussed. The δ18O 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, paleo-environmental evolution and the global climate change.

Keywords】Late Pleistocene; Paleo-dammed lake; Paleo climate; Earthquake; Minjiang River; Diexi