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《Chinese Journal of Geophysics》 1999-01
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GEOPHYSICAL INVESTIGATIONS IN NORTHERN SULU UHPM BELT,PART I:DEEP SEISMIC REFLECTION

YANG WEN-CAI;CHEN ZHIN-YAN;CHEN GUO-JIU; HU ZHEN-YUAN;BAl JIN 1) (Institute of Geology, CAGS,Beijing 100037,China ) 2)(The Fourth Geophysical Exploration Team of New-Star Petroleum Company,Xingxiang 453700,China ) 3) (Institute of Geophysi  
The Sulu high-pressure metamorphic (UHPM)belt is one of the best geological sites worldwide to study the intra-continental collision/ subduction and interactionbetween the crust and the mantle. In order to understand its formation and exhumation,as well as the related geodynamic processes,the structures of the crust and the shallow mantle should be revealed,therefore deep seismic reflection profiling has been carried out and the results from the northern Sulu are presented in this paper. Theresults include:(a)the UHPM rock slices south to the Wuliang-Qingdao fault are dipping north and stacked each other,showing exhumation in Triassic Period;(b)Seismic reflection pattern reveals the doming and extension of the Jiaonan Masiffat about l46ma,(c) the UHPM rock slices of about l2km thick contain a lot ofcoesite-bearing eclogite and have high velocity reaching 6.8 km/s;(d)many wedgereflectors exist around the Moho, showing the intra-continental collision,(f)in Shemensite the high-velocity reflector is buried from 5 7km, it could be considered as oneof candidate sites for continental deep scientific drilling. Other geophysical surveys,such as MT, have been completed in the area, the results will be presented in thepart two following this paper.
【Fund】: 地质矿产部深部地质调查重点研究项目
【CateGory Index】: P631.425,P631.425
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