内蒙古浩尧尔忽洞金矿床多期构造控矿作用浅析

The multi-stage ore-controlling structures of Haoyaoerhudong gold deposit in Inner Mongolia

文章对浩尧尔忽洞金矿床控矿构造进行了分析,指出区域内主要存在三期构造岩浆作用控制着金矿体的空间展布。第一期构造变形发生在加里东期,地层受强烈的挤压作用,形成一系列紧闭线性褶皱和深大断裂;第二期构造作用发生在海西早期,大规模岩浆侵入使地层强烈变形呈"残留体"分布在花岗岩基中,形成了大量中酸性脉岩和含金属硫化物石英细脉;第三期强烈脆韧性剪切作用形成了一系列挤压破碎带和透镜体,为稍晚期含金硫化物细脉侵位提供了良好空间。

This paper made a further analysis of ore-controlling tectonic structures of Haoyaoerhudong gold deposit, and pointed out that the distribution of the gold orebodies was strictly controlled by three stages of tectono-magmatism. The first period of tectonic deformation happened in the Caledonian. The sediments were intensively squeezed and modified, leading to the formation of tight linear fold and deep faults. The second period of tectonization happened at the Early Hercynian, the sediment was intensively modified by large scale magmatic intrusion, becoming relict located in granitoid batholith, and a series of tensile faults, intermediate acidic dykes and polymetallic sulfide-bearing quartz veins were developed. A series of shear zones and lens happened during the third period of tectonization by brittle-ductile shearing, which provided space for later emplacement of sulfide veinlet.