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《Mineral Deposits》 2005-03
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Geology, distribution, types and tectonic settings of Mesozoic molybdenum deposits in East Qinling area

LI Yong-feng~(1,2), Mao Jing-wen~1,Hu Hua-bin~1, GUO Bao-jian~(1,2) and BAI Feng-jun~(1,2) (1 Faculty of Geosciences and Resources, China University of Geosciences, Beijing 100083, China; 2 Henan Bureau of Geology and Mineral Resources for Nonferrous Metals, Zhengzhou 450052, Henan, China)  
Located on the southern margin of the North China craton, the East Qinling molybdenum metallogenic belt is one of several regions in China characterized by the distribution of some important large-size molybdenum deposits. Molybdenum deposits generally occur in nearly E-W direction along the tectonic lineament and are mostly concentrated in a zone stretching from Jinduicheng area of Shaanxi Province in the west to Nannihu-Sandaozhuang-Shangganggou area of Luanchuan and Leimenggou of Songxian in western Henan Province. They are genetically related to Yanshanian intermediate-acid granites distributed extensively in East Qinling area and occur along the endo- and exo-contact zones of the porphyry. The molybdenum deposits are mainly of porphyry and porphyry-skarn type and subordinately of carbonatite vein type. The ore-forming ages of the molybdenum deposits in East Qinling area are within (221.5±0.3) Ma~(132.4±2.0) Ma, and cluster mainly into two pulses of (221.5±0.3) Ma and (144.8±2.1)~(132.4±2.0) Ma. The former pulse geodynamically correspond to the extensional period of post-collision orogenic process between North China and Yangtze cratons. The latter pulse results from the transformation of the tectonic regime from NS- to nearly EW-directions in East China.
【Fund】: 国家重点自然科学基金项目(编号:40434011);; 国家重点基础研究发展规划项目(编号:G1999043211)的成果
【CateGory Index】: P618.65
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