南秦岭中段中、上志留统金矿化特征及控制因素分析

区域地球化学测量和金矿勘查工作显示,中、上志留统是南秦岭中段继泥盆系之后的又一套赋金地层,这套地层的分布区存在一条近EW向展布的金矿化带,宏观上,金矿化带的展布受青泥河-留坝复背斜和大河店-长坪-留坝区域性断裂带的控制.金矿（化）点和金矿（化）体的产出受层位、岩性、煌斑岩脉、火山活动、褶皱、层间构造破碎蚀变带、标高及氧化作用等因素的联合控制.矿体呈似层状产出,由多个呈串珠状展布的透镜体组成,金矿石类型以微细浸染型为主,属金-毒砂-黄铁矿建造.通过对已有矿（化）点和区域水系沉积物异常区进一步工作,有望找到中-大型金矿产地1～2处.

GOLD MINERALIZED CHARACTERISTICS AND CONTROL FACTORS OF MIDDLE TO UPPER SILURIAN SERIES,THE MIDDLIE OF SOUTH QINLING MOUNTAINS

Through regional geochemical survey and gold ore reconnaissance,we find middle to upper Silurian series is another set of layers bearing gold ore deposits besides Devonian in the middle of South Qinling Mountains.A gold mineralized zone which stretchs nearly east-west is discovered in middle to upper Silurian series.And it is controlled by Qinnihe Liuba anticlinorium and Dahedian Changping Liuba regional rift zone.The gold mineral occurrences and ore bodies are jointly controlled by such factors as layers,lithologies,lamprophyric veins,volcanisms,foldings,interlayer broken alteration zones,elevation and oxidizing action.Ore bodies are layering and they are composed of lots of lens appearing as a string of beads.The gold mineral being major micro disseminated type belongs to gold arsenopyrite pyrite formation.We fix hopefully one or two piece(s) of middle large gold mineral occurrence(s) in advance through further works to gold mineral occurrence,mineralized point and regional stream sediment anomalies.