甘肃北山大红山—西涧泉地区水系沉积物地球化学特征及找矿远景

Geochemical characteristics of stream sediments and prospecting prospects in Dahongshan-Xijianquan Area,Beishan,Gansu

在大红山—西涧泉地区开展1∶5万水系沉积物测量,采集样品10 567件,采样粒度-4目至+20目。通过样品分析和数理统计,对成矿元素地球化学特征进行研究,共圈定744处单元素异常、4类组合异常、24处综合异常。根据异常查证评价结果对综合异常进行了分类和排序。在此基础上,结合地质背景、矿产分布特征,划分了4处以Au、Pb、Zn、W、Mo为主的找矿远景区,初步评价了其成矿潜力,指出了具有成矿潜力的矿床类型为蚀变岩型金矿床、陆相火山—次火山热液型铅锌多金属矿床、岩浆热液型钨钼矿床。

1 ∶50 000 stream sediment survey was carried out in Dahongshan-Xijianquan Area, and 10 567 samples were collected with sample grain size varying from-4 meshes to +20 meshes.Through sample analysis and mathematical statistics, the geochemical characteristics of the ore-forming elements were studied, in total delineating 744 single element anomalies, 4 combination anomalies and 24 comprehensive anomalies.The comprehensive anomalies are classified and ranked according to the anomaly inspection and evaluation results.Based on that, 4 prospecting prospects dominated by Au, Pb, Zn, W and Mo were divided according to geological background and mineral distribution characteristics, and their ore-forming potentials were preliminarily evaluated, pointing out that the alterated rock type gold deposits, continental facies volcanic-subvolcanic thermal fluids type lead zinc polymetallic deposits and magmatic thermal fluids type tungsten molybdenum deposits are the deposit types that have ore-forming potentials.