黔西北威宁—水城铅锌矿带动力成矿作用研究

地质地球化学证据显示 ,黔西北铅锌矿带铅锌主要来自基底碎屑岩系 ,硫来自于赋矿地层 ,成矿流体主要来自于构造动力压泌的地层水 ;初始成矿流体特征可能为中低温、较高盐度、较还原、弱酸至弱碱性 ,具Ca2 + (Mg2 + ) -Na+ -F-(Cl-)型 ,Pb、Zn、Ba在其中呈氟氯配合物形式搬运 ,水岩相互作用是Pb、Zn沉淀的重要因素 ;铅锌成矿可分为两个阶段 :第一阶段主要是使原始沉积的黄铁矿层改造富化和改变矿源岩中Pb、Zn的赋存状态 ,第二阶段的构造动力热流泵作用使Pb、Zn叠加富集成矿

TECTONO-DYNAMIC MINERALIZATION IN WEINING-SHUICHENG Pb-Zn ORE BELT, NORTHWESTERN GUIZHOU

Geological and geochemical studies show that Pb and Zn come mainly from microclastic rocks of the basement, S mainly from host rocks and ore-forming fluid mainly from the strata water pressure-filtered by tectonic dynamics. The primary ore-forming fluid is from mesothermal to epithermal, relatively high in salinity, comparatively reducing, weakly acidic to weakly alkaline and of the Ca\+\{2+\}(Mg\+\{2+\})-Na\++-F\+-(Cl\+-) type. Pb,Zn and Ba are possibly transported together with F and Cl complexes. Water-rock interaction is an important factor of ore deposition. The dynamic mineralization involves two stages. In the first stage, the compressional dynamic process led to the formation of the ore-controlling fracture system, the transformation of poor pyrite bed to rich body and changes in occurrence of Pb and Zn in the source bed. In the second stage, the hot fluid pumping process of the tectonic dynamics causes Pb, Zn mineralization to superimpose the pyrite body.