Late Cenozoic drainage reorganization of the paleo-Yangtze river constrained by multi-proxy provenance analysis of the Paleo-lake Xigeda - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Geological Society of America Bulletin Année : 2020

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

Bin Deng
David Chew
  • Fonction : Auteur
Chris Mark
  • Fonction : Auteur
Shugen Liu
  • Fonction : Auteur
Lei Jiang
  • Fonction : Auteur
Gary O’sullivan
  • Fonction : Auteur
Zhiwu Li
  • Fonction : Auteur
Jinxi Li
  • Fonction : Auteur

Résumé

Abstract 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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Dates et versions

hal-04287595 , version 1 (15-11-2023)

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Citer

Bin Deng, David Chew, Chris Mark, Shugen Liu, Nathan Cogné, et al.. Late Cenozoic drainage reorganization of the paleo-Yangtze river constrained by multi-proxy provenance analysis of the Paleo-lake Xigeda. Geological Society of America Bulletin, 2020, 133 (1-2), pp.199-211. ⟨10.1130/B35579.1⟩. ⟨hal-04287595⟩
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