Late Cenozoic drainage reorganization of the paleo-Yangtze river constrained by multi-proxy provenance analysis of the Paleo-lake Xigeda

Bin Deng; David Chew; Chris Mark; Shugen Liu; Nathan Cogné; Lei Jiang; Gary O’Sullivan; Zhiwu Li; Jinxi Li

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Late Cenozoic drainage reorganization of the paleo-Yangtze river constrained by multi-proxy provenance analysis of the Paleo-lake Xigeda

机译：古山古湖北群古代山区的古代长江的晚期排水重组

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The Late Cenozoic evolution of the major river networks draining eastern Tibet has major tectonic implications for the development of the plateau but remains highly contentious. In this study from the southeastern margin of the Tibetan Plateau, we constrain the evolution of the Paleo-lake Xigeda (recorded by the lacustrine Plio-Pleistocene Xigeda Formation) using combined fission-track (FT) dating, U-Pb and trace-element analysis of detrital apatite, along with U-Pb dating of detrital rutile and zircon. Critically, the detrital apatite U-Pb age data from the Xigeda Formation exhibit a major Late Triassic to Jurassic peak that is also seen in the U-Pb rutile and zircon data. When integrated with apatite fission-track (AFT) age peaks at ca. 60–40 Ma and ca. 20–10 Ma and apatite trace-element analyses, these U-Pb ages support provenance from the Songpan-Ganzi and southern Longmenshan terranes to the north. Thus, the Paleo-Xigeda lake was fed by south-flowing paleo-Dadu and paleo-Yalong rivers during Plio-Pleistocene time. Pliocene tectonic activity on the Xianshuihe-Daliangshan-Xiaojiang fault zone likely formed Paleo-lake Xigeda by damming of the Middle Yangtze River; subsequent capture of the Upper Yangtze by the Middle Yangtze after ca. 1.3 Ma likely breached the Paleo-lake Xigeda.

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《Geological Society of America Bulletin》 |2021年第2期|共13页
作者
Bin Deng; David Chew; Chris Mark; Shugen Liu; Nathan Cogné; Lei Jiang; Gary O’Sullivan; Zhiwu Li; Jinxi Li;
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State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation/Chengdu University of Technology;

Department of Geology Trinity College Dublin Dublin;

School of Earth Sciences University College Dublin Science Centre West;

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation/Chengdu University of Technology;

Université de Rennes 1 Centre national de la recherche scientifique (CNRS) Géosciences Rennes;

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation/Chengdu University of Technology;

Department of Geology Trinity College Dublin Dublin;

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation/Chengdu University of Technology;

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation/Chengdu University of Technology;

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正文语种 eng
中图分类地质学;
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12. Supplemental Material: Late Cenozoic drainage reorganization of the paleo-Yangtze river constrained by multi-proxy provenance analysis of the Paleo-lake Xigeda [O] . Bin Deng 2020

机译：补充材料：古湖古湖古湖的古代长江晚新生代排水重组受到古湖Xigeda的多功能源分析
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机译：西南大盆地和科罗拉多河下游地区晚新生代排水历史的地质和生物学观点：会议文摘

Late Cenozoic drainage reorganization of the paleo-Yangtze river constrained by multi-proxy provenance analysis of the Paleo-lake Xigeda

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