Earth Science Frontiers ›› 2020, Vol. 27 ›› Issue (4): 33-48.DOI: 10.13745/j.esf.sf.2020.4.20

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Late Palaeozoic-Early Mesozoic tectonic-magmatic evolution and mineralization in the eastern section of the East Kunlun Orogenic Belt

CHEN Guochao1,2,3(), PEI Xianzhi2,*(), LI Ruibao2, LI Zuochen2, PEI Lei2, LIU Chengjun2, CHEN Youxin2, WANG Meng2, GAO Feng2, WEI Junqi3   

  1. 1. School of Civil Engineering, Nanyang Institute of Technology, Nanyang 473000, China
    2. School of Earth Science and Resources, Chang'an University; Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education; Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Natural Resources, Xi'an 710054, China
    3. Key Laboratory of Rare Mineral, Ministry of Natural Resources, Wuhan 430034, China
  • Received:2019-11-05 Revised:2020-03-15 Online:2020-07-25 Published:2020-07-25
  • Contact: PEI Xianzhi


The East Kunlun Orogenic Belt (EKOB) in the western segment of the Central Orogenic System of China experienced complex and multiple tectono-magmatic events in the past hundreds of millions of years. These tectono-magmatic events from the Late Paleozoic-Early Mesozoic magmatism are most closely related to mineralization. In researching the distribution, evolution and petrogenesis of Late Paleozoic-Early Mesozoic intrusive magmatic rocks as well as geological characteristics of deposits, we investigated the close relationship between tectono-magmatic evolution and mineralization in the eastern part of East Kunlun during this period. Overall, the tectonic evolution of the EKOB can be divided into three stages: the oceanic crust subduction stage (277-240 Ma), syn-collision stage (240-230 Ma) and post-collision stage (230-200 Ma). Crust-mantle magma mixing and mingling occurred during the entire evolutionary process of the Paleo-Tethys Ocean. The mafic plutons are most likely derived from partial co-melting of metasomatic mantle wedge and subduction fluid. Most of the granite magmatites are partial-melting products of the lower crust. The crust-mantle magmatic mixing in the subduction stage of the eastern part of the East Kunlun Orogen brings not only mineralization materials resulting in enrichment of some elements, but also heat source. Physical and chemical deformations of the ore-forming fluid cause mineral precipitation to form a large number of mineral deposits. The main metallogenic combinations are Cu, Mo and Au in small size deposits. In the syn-collision stage, magmatic rock developed rarely due to compressive stress, with ore deposits mainly distributing along the EKOB faults, containing main ore metals Cu, Mo and Au. In the post-collision stage, delamination of lithospheric mantle in an extensional environment provided a channel for mantle materials to participate in mineralization. And the conversion stage from the collision to post-collision stage, specially, is the peak period of Cu, Pb, Zn and Fe metallogenesis from the Late Paleozoic to Early Mesozoic in this area.

Key words: East Kunlun Orogenic Belt, Late Paleozoic to Early Mesozoic, magma evolution, magma mixing and mingling, mineralization

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