南秦岭武当隆起构造特征、控矿作用及找矿方向

Geological Structural Characteristics,Ore-controlling and Ore-prospecting Direction of Wudang Uplift in Southern Qinling Mountains

南秦岭武当隆起区内存在着印支造山期前的顺层韧性剪切构造和近南北向构造,以及印支造山期造山运动形成近东西向挤压逆冲推覆构造。这些不同的构造类型分别控制着武当隆起构造中的银金矿、多金属矿的分布及成矿的富集。顺层韧性剪切构造控制银金矿、多金属矿,沿构造层呈层状或似层状分布;南北向滑覆构造使顺层状的蚀变带在背斜顶部加厚,成矿物质富集;挤压推覆构造使得成矿物质重新富集。建议今后加强武当隆起西缘、武当岩群下部变火山岩组与上部变沉积岩组之间,耀岭河组与陡山沱组之间的顺层滑脱剪切带的找矿。同时应注意对近南北向构造的研究。

There are many layer-paralleled ductile shear structures and nearly north-south structures in pre-Indosinian orogenic period and nearly west-east compressive thrusting structures in Indosinian orogenic period existing in Wudang uplift,southern Qinling mountains. Those different types of structures respectively control the distribution and the mineralization enrichment of silver-gold deposits and polymetallic ores which occur in Wudang uplift. Silver-gold deposits and polymetallic ores are controlled by layer-paralleled ductile shear structures distributing as stratified or stratoid; the NS gliding nappe structures thickening the layered alteration zone at the top of anticline,and enrich the metallogenic materials;the compressive thrusting structures re-enrich the metallogenic materials. It is suggested that the ore-prospecting in the west edge of Wudang uplift,between meta-volcanic litho formation of lower Wudang litho group and meta-sedimentary litho formation of upper Wudang litho group,and in the layer-paralleled ductile shear zone between Yaolinghe formation and Doushantuo formation should be enforced. And the research on nearly NS structures should be attented.