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Mapping crustal structure beneath southern Tibet: new seismic evidence for continental crustal underthrusting

Urheber*innen

Xu,  Q.
External Organizations;

Zhao,  J.
External Organizations;

/persons/resource/yuan

Yuan,  Xiaohui
2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Liu,  H.
External Organizations;

Pei,  S.
External Organizations;

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Zitation

Xu, Q., Zhao, J., Yuan, X., Liu, H., Pei, S. (2013): Mapping crustal structure beneath southern Tibet: new seismic evidence for continental crustal underthrusting, (Geophysical Research Abstracts Vol. 15, EGU2013-5028, 2013), General Assembly European Geosciences Union (Vienna, Austria 2013).


https://gfzpublic.gfz-potsdam.de/pubman/item/item_246989
Zusammenfassung
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.