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The basement tectonics in south of the Okinawa trough

LIU Zhan~1,ZHAO Wen-ju~1,WU Shi-guo~2,FAN Feng-xin~2,SUN Lu-ping~1(1.China university of Petroleum,Dongying 257061,China;2.Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266003,China)  
Based on the latest gravity and magnetic data the basement tectonics in south of the Okinawa Trough was deduced.The results show that Moho likes a saddle structure in south of the Okinawa Trough which is higher in the south and the north but lower in the middle,and the thickness of lithoshere changes from 15.5 km to 21 km.Popularly the basement depth changes among 4 km~6 km,and the depth is larger in south than in the north.Because the effect of NW faults,most the Tertiary local structures trend NW,which indicates that the early NE tectonic belts have been changed by the action of the faults trending NW.There are two igneous rock zones trending NNE in south of Okinawa Trough.One spreads in the east of spreading axis of Okinawa Trough and the west of downgrade of Ryukyu Arc.And the other one spreads in the integrated part of Okinawa Trough and the folded belt of Ryukyu Arc.The igneous rock might be mainly brought about by the action of NE faults,and had little effection by NW faults.
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