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《Mineral Deposits》 2010-06
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Discussion on metallogenic setting and time difference between magmatism and mineralization of molybdenum deposits in East China

DU BaoFeng1,WEI JunHao1,WANG Qi2,LI YanJun1,LIU GuoChun2,YU HaiTao2 and LIU YongLi2(1 Faculty of Earth Resources,China University of Geosciences,Wuhan 430074,Hubei,China;2 Chifeng Institute of Geological and Mineral Exploration of Inner Mongolia,Chifeng 024000,Inner Mongolia,China)  
East China was intensely affected by the Marginal Pacific Metallogenic Domain in Mesozoic.Most molybdenum deposits along border areas of different tectonic units or regional deep faults are dominantly distributed in such metallogenic belts as East Qinling,Yanshan-Liaoning,Middle-Lower reaches of the Yangtze River,Nanling and Da Hinggan Mountains.Combined with previous studies,this paper discusses metallogenic settings of these regions exemplified by typical ore deposits,and draws the conclusion that Mo mineralization in these me-tallogenic belts probably resulted from the extensional setting of post-collision and/or subduction of the Pacific Plate.According to isotopic data of mineralization and ore-related rocks collected from some typical Mo deposits in East China,the authors investigated in detail and quantitatively determined the characteristics of time diffe-rence between magmatism and mineralization for Mo deposits.Mo mineralization in East China occurred contemporaneously with or immediately after ore-related granitoids.Time differences of the two peaking stages of Mo mineralization are within 0~10.0 Ma and 0~15.0 Ma respectively.For a single Mo deposit,the time differences are concentrated in 0~14.0 Ma with a mean of 4.1 Ma.In order of porphyry-type Mo deposits→ porphyry-skarn complex Mo deposits → skarn-type Mo deposits→ quartz vein-type Mo deposits,the time differences seem gradually increase,which is consistent with the observed geological facts of the magmatic hydrothermal ore-formational process.
【Fund】: 教育部创新团队发展计划(IRT0755);; 中国地质大学地质过程与矿产资源国家重点实验室基金资助项目的成果
【CateGory Index】: P618.65
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