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Titel Mapping crustal structure beneath southern Tibet: new seismic evidence for continental crustal underthrusting
VerfasserIn Qiang Xu, Junmeng Zhao, Xiaohui Yuan, Hongbin Liu, Shunping Pei
Konferenz EGU General Assembly 2013
Medientyp Artikel
Sprache Englisch
Digitales Dokument PDF
Erschienen In: GRA - Volume 15 (2013)
Datensatznummer 250076313
 
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.