西南三江地区大地构造演化与成矿作用

发布时间：2018-10-20 16:33

【摘要】：西南三江地区在大地构造位置上处于欧亚板块和印度板块结合部位的特提斯构造域东段。自早古生代以来,区内曾经历过多期次的构造岩浆活动,为金属的成矿作用提供了十分有利的成矿条件,区内已发现有色金属、贵金属为主的矿床约200处;其中,超大型矿床12处,大型矿床60余处,各种金属矿床(点)2 000余处。是我国最重要的金属矿床集中分布区之一。该区从东到西可划分出九个大地构造单元:巴颜喀拉-扬子陆块、甘孜-理塘板块结合带、德格-中甸陆块、金沙江-哀牢山板块结合带、昌都-思茅陆块、澜沦江板块结合带、左贡-保山陆块、班公湖-怒江板块结合带、波密-腾冲陆块;可划分为与此对应的9个成矿带。论述了西南三江地区大地构造演化与金属矿床的成矿作用的关系。提出了西南三江地区造山带自寒武纪以来主要经历了8个大地构造演化与成矿作用发展演化阶段。多期次的构造岩浆成矿作用,在区内形成了丰富的矿产资源和多种矿床成因类型的金属矿床。研究表明,本区金属矿床的主要类型有:火山成因块状硫化物型多金属矿床、层控型多金属矿床、浊积岩型金多金属矿床、岩浆期后热液型铜多金属矿床、矽卡岩型多金属矿床、斑岩型铜多金属矿床、剪切带型金矿床等,为该区金属矿床研究与找矿突破提供了新思路和新资料。
[Abstract]:The southwest Sanjiang area is located in the eastern part of the Tethys tectonic domain where the Eurasian plate and the Indian plate combine in the geotectonic position. Since the early Paleozoic, there have been many periods of tectonic magmatism in the region, which provides a very favorable metallogenic condition for the metallogeny of metals. There are about 200 deposits of non-ferrous metals and precious metals in the region, among which, There are 12 super large deposits, 60 large deposits and 2 000 metal deposits. It is one of the most important concentration areas of metal deposits in China. From east to west, there are nine tectonic units in this area: Bayankara-Yangtze block, Ganzi-Litang plate belt, Degue-Zhongdian block, Jinshajiang-Ailaoshan plate combination zone, Changdu-Simao block. It can be divided into 9 ore-forming belts corresponding to the Lanluanjiang plate conjunctive belt, Zuogong-Baoshan block, Bangonghu-Nujiang plate combination zone and Bormi-Tengchong block. The relationship between geotectonic evolution and mineralization of metal deposits in Sanjiang area, southwest China is discussed. It is suggested that the orogenic belt in Sanjiang area of southwest China has undergone eight stages of tectonic evolution and metallogenesis since the Cambrian. The multi-stage tectono-magmatic mineralization resulted in the formation of rich mineral resources and various metallogenic types of metal deposits in the region. The results show that the main types of metal deposits in this area are volcanic massive sulphide polymetallic deposits, stratabound polymetallic deposits, turbidite gold polymetallic deposits and post-magmatic hydrothermal copper polymetallic deposits. Skarn polymetallic deposits porphyry copper polymetallic deposits and shear zone gold deposits provide new ideas and data for the research and exploration of metal deposits in this area.
【作者单位】：成都地质矿产研究所;四川省地质矿产勘查开发局成都综合岩矿测试中心;华北油田研究院;
【基金】：中国地质调查局西藏尼木整装勘查项目(科[2014]04025078、[2015]020901078) 西南三江有色金属资源基地调查(121201010000150007)
【分类号】：P548;P612

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