Post-collisional crustal extension setting and VHMS mineralization in the Jinshajiang orogenic belt, southwestern China |
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| Authors: | Hou Zengqian Wang Liquan Khin Zaw Mo Xuanxue Wang Mingjie Li Dingmou Pan Guitang |
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| Institution: | a Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, PR China;b Chengdu Institute of Geology and Mineral Resources, Chengdu 56000, PR China;c Centre for Ore Deposit Research, University of Tasmania, GPO Box 252-79, Hobart 7001, Australia;d China University of Geosciences, Beijing 100082, PR China |
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| Abstract: | The Jinshajiang orogenic belt (JOB) of southwestern China, located along the eastern margin of the Himalayan–Tibetan orogen, includes a collage of continental blocks joined by Paleozoic ophiolitic sutures and Permian volcanic arcs. Three major tectonic stages are recognized based on the volcanic–sedimentary sequence and geochemistry of volcanic rocks in the belt. Westward subduction of the Paleozoic Jinshajiang oceanic plate at the end of Permian resulted in the formation of the Chubarong–Dongzhulin intra-oceanic arc and Jamda–Weixi volcanic arc on the eastern margin of the Changdu continental block. Collision between the volcanic arcs and the Yangtze continent block during Early–Middle Triassic caused the closing of the Jinshajiang oceanic basin and the eruption of high-Si and -Al potassic rhyolitic rocks along the Permian volcanic arc. Slab breakoff or mountain-root delamination under this orogenic belt led to post-collisional crustal extension at the end of the Triassic, forming a series of rift basins on this continental margin arc. Significant potential for VHMS deposits occurs in the submarine volcanic districts of the JOB. Mesozoic VHMS deposits occur in the post-collisional extension environment and cluster in the Late Triassic rift basins. |
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| Keywords: | VHMS deposits and mineralization Post-collisional crustal extension The Jinshajiang orogenic belt Southwestern China |
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