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Geophysical deep structure and genetic model of Jinchuan copper-nickel deposit

JIANG Mei1,TAN HanDong2,QIAN Hui1,ZHANG LiShu1,LI QingQing1,PENG Miao2 and WANG Wei1(1 Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;2 China University of Geosciences,Beijing 100083,China)  
Deep exploration was carried out in Jinchuan mine of Gansu Province by using magnetic method,controlled-source audio-magneto-telluric method,and P wave seismic tomography.The comprehensive researches based on the above methods revealed the high resistivity and high velocity characteristics of the magma source to the depth of over 2 500 m,suggesting that the lava came to the shallow part and spread on both sides to form shallow nearly-horizontal lenticular branches.The fact that the possible consistency between the deep ore-bearing ultrabasic rock and the mineral deposit revealed by the drilling hole provides geophysical evidence for the metallogenic model of the Jinchuan copper-nickel mine.Future exploration should focus on investigating relatively gentle,nearly-horizontal,high-velocity,and low resistivity bodies.
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