Abstract

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Title:: Review on Paleo-Mesoproterozoic Strata and Magmation in the Kangdian Area of the Western Margin of the Yangtze Block

Author(s):: FAN Hong-peng; ZHU Wei-guang; CHEN Cai-jie; 1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, Guizhou, China; 2. No. 601 Geological Team, Sichuan Bureau of Metallurgical Geology and Mineral Exploration, Panzhihua 617027, Sichuan, China

Keywords:: stratigraphic sequence; magmation; Paleo-Mesoproterozoic; mineralization; tectonic evolution; Columbia supercontinent; Yangtze Block

Abstract:: Kangdian area, which is located in the western margin of the Yangtze Block, is important for studying the Precambrian tectonic evolution of the Yangtze Block due to its unique history of tectonic evolution and mineralization. The Paleo-Mesoproterozoic strata in this area are meta-volcanic and meta-sedimentary rocks. With the development of various dating techniques, a large number of accurate geochronological results have been reported from this area in recent years. Paleo-Mesoproterozoic stratigraphic sequence, magmation, mineralization and tectonic evolution in the Kangdian area of the western margin of the Yangtze Block were reviewed. Archean-Early Paleoproterozoic rocks are not outcropped in the Kangdian area, but a lot of detrital zircon geochronology data show that the distribution of Archean-Early Paleoproterozoic basement strata is probably widespread in this area; Paleo-Mesoproterozoic magmation in the Kangdian area and even the whole Yangtze Block shows that the tectonic evolution history from collisional orogenesis to extension happens during 1.5-2.0 Ga in the Yangtze Block, which is consistent with the cycle of Columbia supercontinent. Therefore, Yangtze Block may be a component of the Paleo-Mesoproterozoic Columbia supercontinent.