Distal Pb-Zn-Ag veins associated with the world-class Donggou porphyry Mo deposit,southern North China craton |
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| Institution: | 1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;2. China Minmetals Corporation, Beijing 100010, China;3. Department of Earth Sciences, University of Adelaide, SA 5005, Australia;4. Yunnan Geological Survey, Kunming, Yunnan 650051, China;5. School of the Environment, Washington State University, Pullman, WA 99164, USA;1. Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;2. Institut für Mineralogie, Leibniz Universität Hannover, Hannover 30167, Germany;3. Key Laboratory of Orogen and Crust Evolution, Peking University, Beijing 100871, China;4. Centre for Tectonics, Resources and Exploration, Department of Earth Sciences, University of Adelaide, Adelaide SA 5005, Australia;5. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;6. Centre for Exploration Targeting, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;1. Development Research Center of Chinese Geological Survey, Beijing 100037, China;2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;3. Beijing Institute of Geology for Mineral Resources, Beijing 100012, China;1. Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. Beijing Institute of Geology for Mineral Resources, Beijing 100012, China;3. State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China |
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| Abstract: | The southern North China craton hosts numerous world-class porphyry Mo and Pb-Zn-Ag vein deposits. Whether or not the Pb-Zn-Ag veins are genetically associated with the porphyry Mo system remains contentious. Here we focus on the genetic relationships between the Sanyuangou Pb-Zn-Ag vein deposit and the world-class Donggou porphyry Mo deposit, and discuss the potential implications from the spatial and temporal relationships between porphyry and vein systems in the southern North China craton.At Sanyuangou, vein-hosted sulfide mineralization mainly comprises pyrite, sphalerite, and galena, with minor chalcopyrite, pyrrhotite, bornite, tetrahedrite, covellite, polybasite and argentite. The mineralization is hosted by a quartz diorite stock, which has a zircon U-Pb age of 1756 ± 9 Ma. However, sericite from alteration selvages of Pb-Zn-Ag sulfide mineralization yields a well-defined 40Ar/39Ar plateau age of 115.9 ± 0.9 Ma. Although nominally younger, the sericite 40Ar/39Ar age is similar to the age of the nearby Donggou porphyry Mo deposit (zircon U-Pb age of 117.8 ± 0.9; molybdenite Re-Os ages of 117.5 ± 0.8 Ma and 116.4 ± 0.6 Ma). Pyrite from Donggou has elevated contents of Mo and Bi, whereas pyrite from Sanyuangou is enriched in Cu, Zn, Pb, Ag, Au, and As. This trace element pattern is consistent with metal zonation typically observed in porphyry related metallogenic systems. Pyrite grains from Sanyuangou have lead isotopes overlapping those from Donggou (17.273–17.495 vs. 17.328–17.517 for 206Pb/204Pb, 15.431–15.566 vs. 15.408–15.551 for 207Pb/204Pb, and 37.991–38.337 vs. 38.080–38.436 for 208Pb/204Pb). Collectively, the geological, geochronological, and geochemical data support a magmatic-hydrothermal origin for the Sanyuangou Pb-Zn-Ag deposit and confirm that the Pb-Zn-Ag veins and the Donggou Mo deposit form a porphyry-related magmatic-hydrothermal system.Given the widespread Pb-Zn-Ag veins and Mo mineralized porphyries in many districts of the southern North China craton, the model derived from this study has broad implications for further exploration of Mo and Pb-Zn-Ag resources in the area. |
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| Keywords: | Porphyry Mo deposit Pb-Zn-Ag veins Geochronology Trace elements Donggou deposit |
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