Opening of the Neo-Tethys Ocean in the Late Triassic? Sedimentary responses on the northern Indian continental margin

被引：0
|
作者：
Meng Z. [1 ,2 ]
Wang J. [1 ]
Li W. [1 ,3 ]
机构：
[1] Slate Key Laboratory of Lithosphere Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing
[2] Tianjin Center, China Geological Survey North China Center for Geoscience Innovation, Tianjin
[3] College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2023年 / 97卷 / 09期
关键词：
Late Triassic; northern Indian continental margin; opening of Neo-Tethys; paleogcography; sedimentary response; Tethyan Himalaya;
D O I：
10.19762/j.cnki.dizhixuebao.2023155
中图分类号：
学科分类号：
摘要：
The Neo-Tethys recorded by the Indus-Yarlung-Zangbo suture zone in southern Tibet was a vast ocean between Eurasian and Gondwanan continents during the Mesozoic that closed in southern Tibet as a result of Indo-Eurasian collision in the Early Cenozoic. It is a common view that the Neo-Tethys Ocean was formed as a result of rifting of the Lhasa block from the Eastern Gondwana. However, the timing of the rift remains controversial. Proposed timings for the opening of the Neo-Tethys vary from Early Permian to Late Triassic. In this study, we carried out an integrated stratigraphic and sedimentological study on the Permian-Triassic strata deposited on the north Indian continental margin. Our data indicated that the depositional environment remained stable since cessation of the glacial period in the Early Permian. A notable change in sedimentary environment occurred only in the Late Triassic, from a carbonate platform to a terrigenous clastic shelf. Facies change was accompanied by increasing depositional rate, accelerating tectonic subsidence, provenance change, bimodal volcanism, and paleogcographic reconstruction. These changes clearly revealed a regional extensional event, which is considered as a response to the opening of Neo-Tethys. © 2023 Geological Society of China. All rights reserved.
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页码：3024 / 3042
页数：18
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