Geology and Geochemistry of the Shizitou Molybdenum Deposit,Jiangxi Province: Implications for Geodynamic Setting and Metallogenesis |
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| Authors: | WANG Cheng SHAO Yongjun LIU Zhongf LIU Qingquan and ZHANG Yu |
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| Institution: | 1. Key Laboratory of Metallogenic Prediction of Non–ferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, China;2. School of Geo–sciences and Info–physics, Central South University, China;3. School of Resources and safety engineering, Central South University, China;4. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, China |
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| Abstract: | The Shizitou molybdenum (Mo) deposit in Yongping, Jiangxi, is an important, recently discovered deposit in the eastern section of the Qin–Hang metallogenic belt. The Mo deposit is located in the outer contact zone between the porphyritic biotite granite and the Neoproterozoic migmatite, and present in the deep central part of the intrusion. Re–Os dating and S and Pb isotopic analysis have been conducted to assess the metallogenesis of the Shizitou Mo deposit. S, Pb and Re isotopes show that the ore–forming materials were derived from the porphyritic biotite granitic magma, which originated from the mixing of mantle and crust. Re–Os dating of molybdenite from the ores gives a model age from 156.9±2.2 to 158.5±2.4 Ma, with a weighted mean age of 158±1 Ma and an isochron age of 158.0±2.5 Ma. Geological and geochemical characteristics of the ore deposit and the related granitoids indicate that the Shizitou deposit is a Climax–type Mo deposit. Based on previous studies of the Qin–Hang metallogenic belt, two metallogenic events are believed to have occurred during 172–145 Ma and 137–132 Ma. These two metallogenic periods are consistent with the timing of two metallogenic peaks during the middle to late Jurassic and the Cretaceous in South China. These events represent responses to the partial back–arc extension associated with the subduction of the Izanagi plate beneath the Eurasian continent and the rapid northeastward movement of the subducting Izanagi plate. |
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| Keywords: | metallogenic age ore source ore genesis geodynamic setting Shizitou molybdenum deposit Yongping Jiangxi |
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