The Post-collisional Crustal Extension Setting: an Important Mineralizing Environment of Volcanic Massive Sulfide Deposits in Jinsha Orogenic Belt
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P542.2

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    Abstract:

    In recent years, on the basis of research on new materials of regional geology, geology of ore deposits, lithogeochemistry and anatomy of typical volcanic massive sulfide (VHMS) deposits in the Jinsha orogenic belt, the important mineralization of VHMS deposits occurred mainly in the marine arc-volcanic rocks during the late Early Permian-Late Permian and the marine volcanic rocks of rifting basin in the Late Triassic. The VHMS deposits along the Jinsha orogenic belt constitute an important mineralizing zone of polymetallic massive sulfide de-posits of the Sanjiang area (means three rivers area, i. e. , Jinsha River, Nujiang River and Lancang River) , in southwestern China. The superimposed rifting basins formed in the post-collisional crustal extension setting in the Late Triassic were the important pilling area of VHMS mineralization. The volcanism in the rifting basins e-volved from the early-stage bimodal-volcanic rocks to the late-stage intermediate-acidic volcanic rocks and was distinctive from the arc-volcanic rocks in lithogeochemical features, indicating the tectonic extension setting. In the early stage of the extension basin, the "Luchun type" VHMS deposits showing the association feature of el-ements (Zn-Cu-Pb-Ag) formed in the high-K rhyolite of the bimodal rocks and developed in the deep-water fa-cies. In the late stage of the extension basin, the "Zhaokalong-type" VHMS deposits showing the association feature of elements (Ag-Fe-Pb-Zn) formed in the contract strip between the intermediate-acidic volcanic rocks and the overlying carbonate rocks and developed in the shallow-water facies. In the terminal stage of the exten-sion basin, the "Lirenka-type" gypsum deposits were formed in the mollasse clastic rocks of the littoral-shallow facies. The research on the mineralization of the volcanic massive sulfide (VHMS) deposits in the post-collision-al crustal extension setting has an important guiding meaning for the ore prospecting work in the orogenic belt.

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WANG Liquan, HOU Zengqian, MO Xuanxue, WANG Mingjie, XU Qiang)Chengdu Institute of Geology, Mineral Resources, China Geological Survey, Chengdu,)Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing,)China University of.2002. The Post-collisional Crustal Extension Setting: an Important Mineralizing Environment of Volcanic Massive Sulfide Deposits in Jinsha Orogenic Belt[J]. Acta Geologica Sinica,76(4):541-556

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  • Received:
  • Revised:July 27,2001
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