Latest marine horizon north of Qomolangma (Mt Everest): implications for closure of Tethys seaway and collision tectonics

• Published in: Terra nova (Oxford, England) Vol. 14; no. 2; pp. 114 - 120
• Main Authors: Wang, Chengshan, Li, Xianghui, Hu, Xiumian, Jansa, L. F.
• Format: Journal Article
• Language: English
• Published: Oxford UK Blackwell Science Ltd 01-04-2002
• ISSN: 0954-4879; 1365-3121
• DOI: 10.1046/j.1365-3121.2002.00399.x

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.