扬子地块西缘康滇地区古—中元古代地层和岩浆活动研究进展-《地球科学与环境学报》

文章信息/Info

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

作者:: 范宏鹏; 朱维光; 陈才杰; 1. 中国科学院地球化学研究所矿床地球化学国家重点实验室，贵州贵阳 550081；2. 四川省冶金地质勘查局601大队，四川攀枝花 617027

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

摘要:: 康滇地区位于扬子地块西缘，其古—中元古代地层主要由一系列变质沉积岩和变质火山岩组成。康滇地区独特的构造演化历史和成矿作用，使其成为研究扬子地块前寒武纪构造演化的热点地区。随着各种定年技术的发展，该地区近年来有大量精确的年代学研究成果被报道。总结和评述了有关扬子地块西缘康滇地区古—中元古代地层层序、岩浆活动和成矿作用以及构造演化的最新研究成果。虽然目前在该区没有找到有太古宇—古元古界底部地层出露，但大量碎屑锆石年代学数据指示康滇地区很可能广泛分布着太古宙—古元古代基底地层；康滇地区乃至整个扬子地块分布的古—中元古代岩浆活动，指示扬子地块在1.5～2.0 Ga可能经历了碰撞造山到伸展的构造演化过程，而这一过程恰好与Columbia 超大陆旋回一致。因此，扬子地块很可能就是古—中元古代Columbia超大陆的组成部分。

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.