黑龙江宝兴沟金矿床地球化学特征及控矿因素

Geochemical characteristics and ore-controlling factors of Baoxinggou Gold Deposit in Heilongjiang Province

宝兴沟金矿床是位于上黑龙江成矿带上的大型岩金矿床。在充分收集矿区已有资料的基础上,结合矿区钻孔样品及地球化学剖面数据,对矿床地球化学特征进行了研究。研究表明,二十二站组地层成矿元素含量普遍高于克拉克值,且元素变异系数较大,有利于发生迁移,矿体两侧围岩中存在成矿元素向矿体迁移而产生的低值区。地层、构造、岩浆岩是主要的控矿因素,二十二站组地层为矿源层,北东向断裂及其次级断裂控制了矿体的形态和产状,(石英)闪长岩脉、闪长玢岩脉与成矿关系密切,二十二站组地层、北东向构造及岩脉同时存在是寻找金矿体的理想部位。

Baoxinggou Gold Deposit is a large-scale rock gold deposit located on the upper Heilongjiang ore belt.Based detailed collection of existing data in the mining district,the drill samples and geochemical profiling data,the paper studied the geochemical characteristics of the deposit. The results show that ore-forming elements content in the strata of Ershierzhan Formation is generally higher than Clarke value and the element variation coefficient is relatively high,which is favorable for immigration; there are low-value zones forming in the wall rocks on both sides of ore bodies,because ore-forming elements immigrated into ore bodies. The main ore-controlling factors are strata,structures and magmatic rocks. The strata of Ershierzhan Formation are the ore source strata; the morphology and occurrence of ore bodies are controlled by NE fault and its secondary fault; diorite（ quartz） veins and diorite porphyrite are closely related with mineralization. The ideal ore-prospecting target should be the one where Ershierzhan Formation strata,NE structures and rock veins meet.