Publication Date:
2020-02-12
Description:
Receiver function image along a temporary seismic array (ANTILOPE-2) reveals detailed information of the underthrusting of the Indian crust beneath southern Tibet. The Moho dips northward from _50 km to 80 km depth beneath Himalaya terrane and reaches locally a depth of 90 km beneath the Indus-Yalung suture (IYS). It remains at _80 km in Lhasa terrane and shallows to _70 km in Qiangtang terrane. A lower crustal interface at _60 km depth beneath Lhasa terrane can be clearly followed southward through the Main-Himalaya-Thrust (MHT) and connects the Main-Boundary-Thrust (MBT) at the surface, which represents the border of the Indian crust that is underthrusting the Tibetan crust until south of Bangong-Nujiang Suture (BNS) at _32_N. We also observed a wide-spread mid-crustal low velocity zone with increasing depth from _15 km in Lhasa terrane southward to _35 km beneath high Himalaya that is terminated at the MHT. The low-velocity zone is thought to be formed by partial melt and/or aqueous fluids.
Keywords:
550 - Earth sciences
Type:
info:eu-repo/semantics/conferenceObject
