安徽省祁门—黟县地区水系沉积物地球化学特征及找矿方向

Geochemical characteristics of stream sediments and prospecting direction in Qimen-Yixian area of Anhui Province

在安徽祁门—黟县地区开展1∶50000水系沉积物测量,采集样品5386件,通过水系沉积物样品分析结果的数理统计,对成矿元素地球化学特征进行了研究。利用元素地球化学特征参数、R型聚类分析结果划分了高、中、低温3个元素组合类型,组合异常的分布规律反映了祁门—黟县地区多金属元素富集主要受燕山期岩浆—构造成矿体系和寒武系黑色岩系控制。在此基础上,结合地质、矿产分布特征,圈定了6处多金属矿成矿远景区,主攻矿种为金多金属矿,目标矿床类型为岩浆热液充填型、矽卡岩型。利用水系沉积物测量成果,在祁门黄古田、金家山等地开展异常查证与矿产勘查,发现了一批金、铅锌矿体,表明该方法在本地区具有良好的找矿应用价值。

Based on 1∶50000 stream sediments survey and mathematical statistics of analytical results of 5386 samples,the authors conducted an in-depth study of the geochemical characteristics of ore-forming elements of Qimen-Yixian area in Anhui Province.Through element geochemical characteristics analysis and R cluster analysis,the element combination was divided into three types,namely,high temperature anomaly,medium temperature anomaly and low temperature anomaly.The distribution law of combined anomalies shows polymetallic element enrichment in Qimen-Yixian area,mainly controlled by Yanshanian magmatic-tectonic mineralization system and Cambrian black rock series.On such a basis,six polymetallic metallogenic prospective areas were delineated according to geological and mineral resources features.Gold was selected as the dominant mineral,and the target deposit types are magmatic hydrothermal filling and skarn types.Anomaly verification and mineral exploration were carried out in Huanggutian,Guxi,Jinjiashan areas of Qimen County based on the results of the stream sediments survey.A batch of gold,tungsten,molybdenum orebodies were discovered,indicating that there exists great application value of prospecting in this area.