Abstract

The Xigaze Cretaceous forearc basin located between the Lhasa Block and Indus-Yarlung Suture was filled with flysch deposits during the mid-Cretaceous, as the Tethys oceanic crust was being subducted underneath Eurasia. The flysch comprises the Xigaze Group, dominated by the Angren Formation. Well preserved, newly discovered foraminifera within the Angren Formation constrain its age to late Albian to late Coniacian. Radiometric dating of the ophiolite belt impinging on the southern edge of the forearc basin yielded an age of 120+10 Ma, which implies that the deposition in the forearc basin occurred shortly after initiation of the subduction of the Neotethys.

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