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《Earth Science Frontiers》 2015-06
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Origin of the Ashi volcano,Western Kunlun Mountains:Evidence from seismic tomography

WEI Wei;XU Jiandong;YU Hongmei;WEI Feixiang;Key Laboratory of Active Tectonics and Volcano,Institute of Geology,China Earthquake Administration;  
We carried out a high-resolution P-wave velocity tomography of the Tibetan Plateau,Ashikule volcano clusters and surrounding areas by using arrival-time data obtained from the nationwide seismic network,International Seismological Centre(ISC)as well as temporary seismic arrays deployed on the Tibetan Plateau.Our high-resolution tomography shows that the Indian plate is revealed as a high-velocity anomaly and it is subducted beneath the Tibetan Plateau.The northern limit of the high-velocity anomaly has reached to the northern boundary of western Tibet,to the Bangong-Nujiang suture under central Tibet and around the Jinsha River suture under eastern Tibet,suggesting the different north-south distance that the Indian plate subducted northward.Our tomographic results suggest that the Indian plate has subducted to western Kunlun,around the Ashi volcano.To the north,the Tarim block shows a prominent high velocity anomaly.We found obvious low velocity anomalies and magma upwelling path beneath the Ashi volcano.In the mantle transition zone,there is a low velocity zone beneath the Ashi volcano.The Ashikule volcano clusters could be formed by the decompression melting of asthenospheric materials and magma upwelling.
【Fund】: 国家自然科学基金项目(41372344);; 中央级公益性科研院所基本科研业务专项(IGCEA1307)
【CateGory Index】: P317;P315
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