三江地区大规模成矿动力学模式浅析

A Brief Analysis of Geodynamic Model of Large-scale Mineralization in the Sanjiang(Nujiang, Lancangjiang and Jinshajiang) region

喜山期印度板块与欧亚板块的强烈碰撞,引起"三江"造山带与扬子陆块西缘抬升和地壳加厚并深插上地幔,在东亚旋涡旋转作用下("全球旋涡大地构造假说"之东亚旋涡单元),上地幔软流圈的高能旋转受阻而被动沿构造裂隙上涌,导致强烈的岩浆活动和大规模成矿物质上涌,并在有利条件下完成各种成矿物质的分异-富集和大规模成矿作用;产生了大型-超大型矿床集中区,成为我国最重要成矿区带之一,是三江地区特有的"加厚旋涌"成矿动力学模式。

Strong collision between Indian plate and Eurasian plate in the Himalayan epoch resulted in the uplift of the Sanjiang orogenic belt and the western margin of the Yangtze block and crust thickened and deeply inserting into the mantle. Under the influence of east Asian vortex rotation(East Asian vortex unit of the global vortex geotectonic hypothesis), high energy rotation of the upper mantle asthenosphere was hindered and passively upwelling along tectonic fissures which led to intense magmatic activity and massive upwelling of ore material and differentiation, enrichment and large-scale mineralization of various ore materials were completed under favorable conditions. As a consequence, a large and superlarge deposit concentration area was formed. It is one of the most important metallogenetic belts in China.