甘肃明舒井南金矿床土壤地球化学异常特征及找矿潜力

Soil geochemical anomalous characteristics and prospecting potential of Mingshujingnan gold deposit in Gansu

为优选明舒井南找矿靶区,在了解该区地质特征的基础上,开展了1∶10000土壤地球化学测量工作,对矿区元素的富集、分异及土壤地球化学综合异常特征研究表明:(1)矿区处于Au元素高背景带上,下石炭统红柳园组及其中发育的石英脉中Au以强富集强分异(Au富集系数f>2.5,变异系数Cv>3.2)为特征;As、Sb、W元素也表现出富集与强分异特征,表明矿区热液活动具多源多期叠加特征,Au来源于地层又来源于深部热液;(2)寻找金矿有利的指示元素为Au、Ag、As、Sb、W,这些元素的异常强度及形态主要受控于断裂构造及裂隙的发育程度;(3)断裂构造及裂隙是矿区金成矿的主要控矿因素;(4)查证圈定的甲1类HT2、HT3综合异常获得金矿化体14条,金矿体5条,新增金潜在矿产资源837 kg,矿区土壤地球化学异常为矿致异常,金矿找矿潜力优势明显。

To optimize prospecting targets in the south area of Mingshujing,we carried out 1∶10000 soil geochemical survey for understanding the geological characteristics,and found out the enrichment and differentiation of elements in the mining area and the comprehensive geochemical anomaly characteristics of soil.(1)The mining area is on the high background of Au.Au in the Lower Carboniferous Hongliuyuan Formation and its quartz veins are characterized by strong enrichment and strong differentiation.(The enrichment factor of Au is more than 2.5,coefficient of variation Cv>3.2).As,Sb and W elements also show enrichment and strong differentiation characteristics,indicating that the hydrothermal activity is characterized by multi-source and multi-stage superposition in the mining area.And gold comes from strata and deep hydrothermal solution.(2)The favorable ore-forming elements for gold deposits in this area are Au,Ag,As,Sb and W.The anomalous strength and shape of these elements are mainly controlled by the developing degree of fault structure and fissures.(3)Fault structure and fracture are the main ore-controlling factors of gold mineralization in the mining area.(4)14 gold mineralized bodies and 5 gold mineralized bodies were obtained by investigating and delineating class A1 HT2 and HT3 comprehensive anomalies.And 837 kg more of potential gold resources were added.The soil geochemical anomalies in the mining area are ore-induced anomalies,and the prospecting potential of gold deposit is obvious.