Gangdese batholith

[1] The collision caused a peripheral foreland basin to form in the north part of the Lhasa terrane, which persisted into the Early Cretaceous.

In some parts of the foreland basin, the north-dipping subduction of the Neotethyan oceanic crust below the Lhasa terrane caused volcanism.

[3] The second stage of activity may be due to the approach of India, preceded by the rollback of the subducted slab and peaking at the time of the collision.

[5] The Nyingchi complex forms the eastern segment of the Gangdese magmatic arc, and is mainly composed of plutons and their metamorphosed equivalents.

I-type granitoids in this complex date to c. 65–56 Ma, and appear to have been emplaced in the Lhasa terrane at the middle to lower crustal depths.

Lhasa terrane approach to Qiangtang terrane. Subduction of the Neotethyan ocean floor may explain the first period of activity.