山西省夏县洞沟金矿地质特征

摘要

Donggou area in Xiaxian County,Shanxi province,is located in the south of contact zone between the Erdos massif and Hehuai massif in the North China plate, in the middle of Zhongtiao Mountain uplift in Taihang Mountain area. With complete stratum exposed and strong magmatic activities, the metallogenic condition is very superior. We, No.214 geological team of Geological Survey of Shanxi Province, worked on it from 2012 to 2015. To narrow the range of prospecting, we conducted a 1/10 000 geological mapping and the soil geochemistry survey. Through the analysis of metallogenic condition in Aigou area, we considered tectonic fracture zone and the secondary tectonic fracture zone have an important significance in mineralization. We anatomized the fracture zone and the abnormal key parts by trenching, drilling and found the following ore bodies: thirteen gold ore bodies, one copper ore body and one gold ore body in low quality. Gold ore bodies are discovered in diabase vein and contact zone of the surrounding rock. So, we inferred the mineralization refers to the incursion of diabase vein and the contact zone. The cause is about the deposit with low temperature in fracture zone. We can prospect better with the basis and suggestion by the analysis of geological features and geochemical anomalies.%山西省夏县洞沟一带大地构造位于华北大陆亚板块南部鄂尔多斯地块与河淮地块接触带南部，太行山地区中条山隆起中段。地层出露较全,构造发育,岩浆活动强烈，成矿地质条件优越。山西省地质勘查局214地质队在2012—2015年对该区进行了1/1万地质填图、1/1万土壤地球化学测量，分析了邻区艾沟金矿区成矿条件，认为构造破碎带及次级构造破碎带对成矿意义重大。通过槽探、钻孔工程对构造破碎带及重点异常部位进行解剖，共发现了13条金矿化体，1条铜矿体和1条低品位金矿体；金矿体产于辉绿岩脉及其围岩接触带中，推断成矿作用与辉绿岩脉侵入及其接触带有关。成因类型应属破碎带中低温热液型金矿床。本文通过对该区地质特征、化探异常特征的分析，为下一步开展找矿工作提供了依据和建议。