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《MINERAL DEPOSITS》 1999-04
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TYPES,GEOLOGICALBACKGROUND,METALLOGENIC PROVINCESANDORE_FORMINGSYSTEMATICSOF MAJORCOPPERDEPOSITSINEASTERNCHINA

Qin Kezhang1 ,2 , Wang Dongbo1 , Wang Zhitian1 and Sun Shu2 (1 Beijing Instituteof Geology for Mineral Resources,Beijing 100012 ;2 Open Laboratoryof Lithosphere,InstituteofGeology and Geophysics,Chinese Academy of Sciences,Beijing 100029)  
Based on a comprehensiveinvestigationinto 22 large_sized and over 40 medium_sized copper depositsin eastern Chinain comparison with some copper depositsabroad ,this paper hasreached thefollowing conclusions:(1) The continental crustin eastern China was formed by accretion around several older massifs throughout the geological ages, which led to the migration of the metallization oflarge copper depositstowardsthe marginsofthe old plates with thelapse oftime. Therefore,large copperdepositsin eastern China mostly occuralong marginsofplatforms,accre tionary fold belts and intracontinentalfaulted downwarping belts,showing close relation to the geochemical sharp_ chanege zones along massif margins .( 2 ) There are six major metallogenicepochsforlarge copper deposits in eastern China. Of these the Mesozoicis the most important one,and nextcome Late Paleozoicand Mesoproterozoic.(3) Amongthe ninetypesofcopper de positsfoundin eastern China,the porphyry typeis mostimportant,followed by submarine sedi ments_hosted massive sulfide type,skarn type , VMS, and Cu_Ni type. The submarine sedi ments_hosted massivesuilfidetype,subaerial hudrothermalsedimentary type and subvolcanic hy drothermalvein type copper deposits are three new types proposed by the authors. The EasternChinesecontinentis characterized by varied plate tectonic styles as well as frequent and rather strong crustalactivation .Therefore,sofarastheformation oflargecopper depositsisconcerned, the environmentseemsto be morefavorableforthe depositsof mainly endogenic originthan those dominated by exogenic origin .Thecomplicated multi_cycle crustalactivityin eastern Chinaledto the presence of metallogenicinheritance and 》isolocalization" metallization within a single mining regime.(4) The papersuggests and demonstratesfour metallogenic systematicsin which coppermaterialcan beaccumulated massively.(5) Nine metallogenicprovincesand prospects were delin eated, of which the Lower Yangtze depressive zone,Jiangnan axis and Xikang_Yunnan axis provinces are most important.In addition,this paper also deals with the tectonic property of Mesozoic volcanic_intrusive domainsin eastern China and thefactorsresponsibleforthe factthat porphyry copper depositsin eastern China are much smaller in size and quantity than those inwestern America
【Fund】: 中国有色金属总公司“大型铜矿成矿环境对比”科研项目;跨世纪人才基金、博士后基金
【CateGory Index】: P618.41
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