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TitleLatest marine horizon north of Qomolangma (Mt Everest): implications for closure of Tethys seaway and collision tectonics
AuthorWang, C; Li, X; Hu, X; Jansa, L F
SourceTerra Nova vol. 14, 2002 p. 114-120,
LinksAbstract - Résumé
Alt SeriesGeological Survey of Canada, Contribution Series 2000276
Mediapaper; on-line; digital
File formatpdf
Lat/Long WENS 87.0000 91.0000 29.0000 27.0000
Subjectsgeophysics; structural geology; tectonics; plate tectonics; tectonic setting; tectonic evolution; crustal movements; shales; sandstones; microfossils; deformation; paleomagnetism; oceanic crust; closure of the Tethys seaway; Tethys seaway; Tethys ocean; Cretaceous
Illustrationslocation maps; geological sketch maps; aerial photographs; cross-sections, stratigraphic; stratigraphic columns; tables
Released2002 04 05
AbstractThe 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.