川滇黔地区MVT铅锌矿床分布、特征及成因

位于扬子地台西南缘的川滇黔铅锌多金属成矿区是中国重要的铅、锌、银、锗生产基地，目前在该成矿区已经发现大、中、小型铅锌矿床和矿点400多处。经过对比研究，这些矿床的赋矿围岩为震旦系一二叠系碳酸盐岩，矿体明显受控于断裂构造，并伴随有强烈的白云岩化和方解石化，以低温、低盐度为特征，成矿时代可能为中生代，成矿物质主要来自地层本身。它们为受热对流循环流体经过成矿物质萃取、搬运和卸载而成矿，是大陆边缘造山带东侧伸展带中的产物，属于比较典型的密西西比河谷型铅锌矿床。

Distribution, characteristics and genesis of Mississippi Valley-Type lead_zinc deposits in Sichuan_Yunnan_Guizhou area

The Mississippi Valley-type lead-zinc deposits are widely distributed in Sichuan-Yunnnan-Guizhou Provinces. These deposits constitute an important component part of the low temperature metallogenic system consisting of Carlin type gold, Mississippi Valley-type lead-zinc and, possibly, basalt-hosted copper deposits in southwestern China, with characteristics of low temperature and low salinity. The Pb-Zn deposits are hosted in Late Proterozoic to Permian carbonate rocks. Their orebodies are obviously controlled by faults and accompanied by intense calcitization and dolomitization. Ore-forming materials were derived from host strata. The ore-forming process seems to be the leaching of ore-forming materials from the host rocks by the convective heated hydrothermal solution, followed by transport and precipitation of these materials along some fracture systems. The metallogenic epoch is likely to be Mesozoic. These deposits were formed in the extensional basin on the east side of the continental orogenic belt along the Yangtze Craton.