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Latest marine horizon north of Qomolangma (Mt Everest): implications for closure of Tethys seaway and collision tectonics 总被引:9,自引:0,他引:9
The newly discovered marine horizon at Zhepure Syncline, north of Qomolangma, revises timing of the closure of the eastern Neo-Tethys seaway in the central Himalayas. The marine Pengqu Formation conformably overlies a Lutetian shallow-water carbonate platform and comprises shales interbedded with sandstones deposited in a neritic shelf environment. The strata are dated by nannofossils and foraminifera as late early Lutetian to late Priabonian age (NP15–NP20, deposited ≈ 47–34 Ma), indicating that the final closure of the Tethys seaway in this region occurred at ∼ 34 Ma. The newly discovered strata provide evidence about emplacement of a major thrust sheet south of southern Tibet prior to ∼ 37 Ma, which affected the regional climate. 相似文献
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