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《GEOTECTONICA ET METALLOGENIA》 1998-S1
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STRIKE-SLIP STRUCTURE AND URANIUM MINERALIZATION IN EAST HUNAN AND ITS ADJACENT AREA, CHINA

FANG Shiyi(Research Institute No. 230, Central South Bureau of Geology, CNNC, Changsha 410011)  
East Hunan and its adjacent area are defined as an intraplate orogenic zone with the helpof new theory of geology and multi-discipline reserach. The evolutionary stages, deep structure, geological feature, rotation strain and metallogeny of NW-striking transfer fault zoneare discussed. NE-trending strike-slip fault zone, as a whole, entered action during the Pacific movement and underwent 3 stages: strike-slip shearing, pull-apart extension and compressive thrusting. The macro- and microscopic features of strike-slip fault and its controlling factors for uranium mineralization in Jinguanchang deposit are studied by means of modern structure analysis, micro-submicroscopic investigation and geophysical measurement.The narrow stretching belt of magnetotelluric sounding low value belongs to upper mantle partial structural softening belt, which extends to the base of lithosphere and in whichlateral flow of crust-mantle material is advantageous for the reason of violent change ofcrustal thickness. The thickening of widespread Hercynian-Indo-Sino carbonate strata indicates that there has been a sedimentary center concerned with long-term active NW-directiontransform fault since Caledonian epoch. The uranium deposits are often located at the partialdoming edge of the depression. NW-direction transform fault and NE-direction strike-slipfault not only provide transporting passages for the exchange of crust-mantle, but also arethe precondition to bring out the development and location of polyphase uranium-bearinggranite. Cover host strata concerned with exocontact belt and host structure produced bystretching and strike-slip arc advantage place for collecting ore.
【CateGory Index】: P618.1401
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