河北白塔地区含金石英脉地质特征及找矿方向

Geological Characteristics and Prospecting Direction of the Gold-bearing Quartz Veins in Baita Area,Hebei Province

河北省张家口市白塔一带石英脉数量众多,部分含金,脉体形态在走向及倾向上产状变化较大,属中温热液矿床。结合区内地质工作成果,对区域成矿地质背景、变质作用、围岩蚀变以及含金石英脉地质特征进行了详细分析,结果表明:1海西期晚期二长花岗岩大规模侵入到新太古界红旗营子群变质岩内,侵入过程与构造活动同期,受构造应力作用形成同构造岩浆岩;2成矿金属物质主要来自新太古界红旗营子群变质岩,海西期岩浆和构造活动为成矿提供了热源和容矿空间,特别是沿不同地质体接触带发育的断裂破碎带为最有利的赋矿、控矿部位。在上述分析的基础上,对矿床成因及找矿方向进行了讨论,对于区内进一步开展金矿找矿工作有一定的参考价值。

There are a lot of quartz veins in the Baita area in Zhangjiakou city,Hebei province,part of the quartz veins contain gold element,variation of the occurrence of the gold-bearing quartz veins is great along the shrike and dip direction. The gold-bearing quartz veins are belongs to the mesothermal deposit. Based on the geological prospecting results of the area,the regional metallogenic geological background,metamorphism,wall rock alteration characteristics and the geological characteristics of the goldbearing quartz veins are analyzed in detail,the results show that: 1in the stage of late Hercynian,the metamorphic rock of Hongqiyingzi group of new Archaeozoic erathem is invaded by the monzonitic granite in a large scale,the intrusion process and tectonic activity occurring at the same time,the syn-tectonic granite is formed under the tectonic stress action; 2the metallogenic metals of the gold-bearing quartz veins is mainly derived from the metamorphic rock of Hongqiyingzi group of new Archaeozoic erathem,the heat source and holding ore space are provided by the magmatic activities and tectonic activities,especially the fractured developed along the contact zones of different geological bodies are the favorable ore-bearing and ore- controlling positions. Based on the above analysis results,the deposit genesis and prospecting direction are discussed to provide some reference for the prospecting work of gold deposit in the area.