湘黔汞矿带旋扭构造动力作用与成矿规律

Rotational Shear Tectonics and Metallogeny of the Mercury Ore Belt in Hunan and Guizhou Provinces,China

湘西黔东地区,在古生代沉积盖层中,北北东向保靖-铜仁断裂带的东侧,发育一系列北东向平移逆冲压扭性断裂构造带,它们均具有相似的变形特征和动力学机制,构成一个大型压扭性旋扭构造系统。旋扭构造控制了湘黔汞矿带的分布,其中北东向断裂带控制了汞矿带内各矿田的展布,而由北东向断裂带所派生的次级张扭性断裂裂隙带,则控制了单个矿体或矿床的产出和定位,特大型和大型汞矿床均产于旋扭构造的应力强区内。

There exist a series of NE-trending strike-slip thrust knob fault belts in the Paleozoic sedimentary rocks west of the NNE-trending Baojing-Tongren fault belt in western Hunan and eastern Guizhou provinces.The fault belts have similar faulting characteristics and kinetic mechanism,are form a large-scale thrust knob structure.The knob structure controlled the distribution of the mercury ore belt in Hunan and Guizhou provinces.The NE-trending fault belt controlled the ore fields in the mercury ore belt,while the secondary extentional-shear fault and fractures derived from the NE-trending fault belt controlled the outcrop and location of individual ore body or deposit.The super-large and large-scale mercury ore deposits occur in the strong stress areas of the knob structure.