河北省苇子沟金矿矿床地质特征及成矿规律研究

Study on Geological Characteristics and Metallogenic Regularity of Weizigou Gold Deposit in Hebei Province

研究区位于燕辽沉降带、马兰峪-山海关隆起北部,都山岩体东南侧NE-NNE向弧形构造带中。区内主要含矿构造为北东东向、南北向断裂,含金石英脉直接赋存其中,呈似板状、透镜状,具尖灭再现、脉壁平直光滑等特征。矿区金矿化富集经历了片理化构造阶段、石英脉阶段、含金黄铁矿石英脉阶段和碳酸盐化阶段,其中含金黄铁矿石英脉阶段决定了金矿床的品位,聚晶团囊状黄铁矿化金品位较高,细晶细脉状或粉脉状品位较低。根据金矿化阶段及富集规律分析,本区矿床成因属中低温热液成矿含金硫化物石英脉型金矿,成矿以充填方式为主。

The research area is located in the Yanliao subsidence zone,the north of Malanyu-Shanhaigou uplift,and the NE-NNE arc tectonic belt on the southeast side of Dushan pluton.The main ore-bearing structures in the area are NEE and south to north faults,and the gold-bearing quartz veins occur directly in them,which are platelike and lenticular,with the recurrence of spikes and the wall of veins being straight and smooth.The gold mineralization and enrichment of the gold deposit have experienced the lamellar structure stage,quartz vein stage,gold-bearing iron ore vein stage and carbonation stage,in which the gold-bearing iron ore vein stage determines the grade of the gold deposit.The gold grade of polycrystalline sac pyrite is higher,and the grade of fine crystalline vein or powder vein is lower.According to the analysis of gold mineralization stage and enrichment rule,the genesis of the deposit in this area belongs to the quartz vein type gold deposit with gold bearing sulfide in medium and low temperature hydrothermal mineralization.