Earth Science Frontiers ›› 2020, Vol. 27 ›› Issue (2): 106-136.DOI: 10.13745/j.esf.sf.2020.3.9

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Further discussion on the Sanjiang Tethyan composite metallogenic system

DENG Jun1,2(), WANG Qingfei1,2, CHEN Fuchuan1,2, LI Gongjian1,2, YANG Liqiang1,2, WANG Changming1,2, ZHANG Jing1,2, SUN Xiang1,2, SHU Qihai1,2, HE Wenyan1,2, GAO Xue1,2, GAO Liang1,3, LIU Xuefei1,2, ZHENG Yuanchuan1,2, QIU Kunfeng1,2, XUE Shengchao1,2, XU Jiahao1,2   

  1. 1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences(Beijing), Beijing 100083, China
    2. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China
    3. School of Ocean Sciences, China University of Geosciences(Beijing), Beijing 100083, China
  • Received:2020-03-02 Revised:2020-03-12 Online:2020-03-25 Published:2020-03-25

Abstract:

Composite orogeny and composite metallogenesis are salient features of the regional tectonic evolution and metallogeny in China, respectively. The complex sources of ore-forming materials, variable mechanisms of tectonic driving, divers genetic types of mineralization and the multi-stage of remobilization and overprint, have been the research interest in the scope of regional metallogenic theory. The Sanjiang Tethyan orogenic belt in Southwest China is a typical miniature of composite orogeny in China. It has a complex spatial-temporal composite orogenic framework, undergoing the evolution of the Proto-, Paleo-, Meso- and Neo-Tethyan accretionary orogeny in Paleozoic and Mesozoic and the collisional orogeny between Indian and Eurasian plates in Cenozoic. In order to systematically explain the composite metallogenesis under the background of composite orogeny and guide the regional exploration scientifically, in this paper, based on the theory of metallogenic system, we divide Proto-, Paleo-, Meso- and Neo-Tethyan metallogenic system related to accretionary orogeny, and squeezing folds, removal extension, squeezing slip, stretching rotation metallogenic system related to collisional orogeny, recognize that composite metallogeny is significant, and identify four types of typical composite metallogenic systems in five metallogenic belts, including accretionary-collisional orogenic VMS Pb-Zn-Cu+magmatic-hydrothermal Mo-Cu along the Changning-Menglian suture zone, accretionary+collisional magmatic-hydrothermal Cu-Mo-Sn-W in the Yidun arc and Tengchong-Baoshan block, collisional orogenic MVT Pb-Zn+magmatic-hydrothermal Cu-Pb-Zn-Ag in the Lanping basin and collisional orogenic alkali-rich-porphyry (Au-Cu-Mo)+orogenic Au type along the western margin of the Yangtze block. We also analyze the components each composite metallogenic system in detail, and propose the theory of composite metallogenic system, which means that geological systems formed by superimposition or interaction of multiple metallogenic events with different times or genetic types driven by the spatial-temporal transitions of varying tectonic regimes during superimposed orogeny.It was revealed the tectonic regime transition occurring upon the previous arc or rift belt is the main mechanism for the formation of composite metallogenic system.

Key words: ore genesis, metallogenic system, composite metallogenesis, Tethyan orogenic belt, Sanjiang region, Southwest China

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