Pyrite Re-Os isotope systematics at the Zijinshan deposit of SW Fujian,China: Constraints on the timing and source of Cu-Au mineralization |
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| Institution: | 1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;2. Centre for Exploration Targeting, The University of Western Australia, Crawley, WA 6009, Australia;3. Exploration Team 606 of the Sichuan Metallurgical and Geological Exploration Bureau, Chengdu 611730, China;1. Science and Mineral Resource, China University of Geosciences, Beijing 100083, China;2. Gold Geological Institute of CAPF, Langfang 065000, Hebei, China;3. MRL Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;4. Economic Geology Research Center, College of Science, Technology and Engineering, James Cook University, Townsville 4811, Australia;5. Surveying Geotechnical Research Co., Ltd of MCC, Wuhan 430080, Hubei, China;1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing 100029, PR China;2. Centre for Exploration Targeting, University of Western Australia, 35, Stirling Highway, Crawley 6009, Australia;1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;2. State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China;3. Department of Earth Sciences, The University of Hong Kong, Hong Kong, China;1. Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PRChina;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, PR China;3. Zijin Mining Group Co. Ltd, Shanghang 364200, Fujian, PR China;4. Centre of Excellence in Ore Deposits (CODES), University of Tasmania, Private Bag 79, Hobart, Australia;1. State Key Laboratory of Geological Processes and Mineral Resources, Faculty of the Earth Sciences and Resources, China University of Geosciences, 100083 Beijing, China;2. Department of Geology, University of Regina, S4S 0A2 Regina, Canada;1. CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 511 Kehua Street, Wushan, Guangzhou 510640, PR China;2. Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China;3. School of Earth Science and Geological Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China;4. SOA Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Ocean Administration, PR China;5. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 511 Kehua Street, Wushan, Guangzhou 510640, PR China;6. Department of Geology, Northwest University, Xi''an, 710069, PR China;7. CAS Center for Excellence in Tibetan Plateau Earth Sciences, The Chinese Academy of Sciences, Guangzhou 510640, PR China;8. Guangdong Key Laboratory of Geological Processes and Mineral Resource Exploration, Guangzhou 510275, PR China |
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| Abstract: | Zijinshan is the largest high-sulfidation epithermal Cu–Au deposit on mainland China. The primary mineralization at the deposit is characterized by pyrite, digenite and covellite. Although some Rb Sr isochron ages of the fluid inclusions in quartz and the apparent K-Ar age of the Cu-bearing alunite alteration zone have been previously interpreted as the ore-forming age, the Rb-Sr and K-Ar dating systems are usually readily reset due to their closure temperature, and thus document the latest thermal event. In order to precisely determine the age of the Cu mineralization, eight-pyrite separates were Re-Os dated, and seven yielded an isochron age of 103 ± 4 Ma with an initial 187Os/188Os ratio of 0.45 ± 0.14. This date is interpreted as the age of Cu mineralization, which is in agreement with geochronological data from molybdenite and the porphyritic granodiorite that hosts Cu-Mo mineralization at Luoboling (located 2 km NE of Zijinshan), suggesting that these two deposits were formed during the same metallogenic event. The relatively low initial 187Os/188Os ratio indicates that the source of the Cu at Zijinshan is predominantly the crust with input from the mantle. |
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