河南银洞坡金矿区深部激电异常特征及找矿标志

Deep IP Anomaly Characteristics and Prospecting Indicator of Yindongpo Gold Mining Area in Henan Province

河南银洞坡金矿是我国探明的重要的特大型混合热液型金矿床。矿体(或矿脉群)、控矿构造、岩浆岩、赋矿地层以及周围地质体之间存在某种物性差异,因而具有明显的地球物理异常特征。通过对矿床深部激电异常特征进行解译,并对低阻、高极化率异常进行了钻探验证,钻孔深部见矿位置与异常吻合性较好。在上述分析的基础上,根据区域地质成矿类型得知,矿床东段主要工业矿体呈鞍状、似层状分布于Pt_3W_2~2厚层碳质绢云石英片岩内,由于矿化碳质绢云石英片岩呈低阻、高极化特征,可见具有低阻、高极化特征的矿化碳质绢云石英片岩为矿区金矿的重要找矿标志。

Yindongpo Gold Mine in Henan Province is the important super-large mixed hydrother- real gold deposit in our country. The certain physical difference of orebodies （ore vein groups） , ore-con- trolling structure,magmatic, ore-bearing strata and their surrounding geological bodies is existed, the geo- physical anomaly of them is significant. Through the interpretation of the deep IP anomaly of the mining area, the drilling verification of the low resistance and high polarizability anomalies is done. The location of deep orebody is in good agreement with the geophysical anomalies. Based on the above discussion re- suhs,according to the regional metallogenic types,the main industrial orebodies in the east of the deposit is saddle-like and stratiform distributed in Pt3W2/2 thick layer of carbonaceous sericite in quartz schist, due to the mineralized carbonaceous sericite quartz schist is characterized by low resistance and high polariz- ability,therefore,the IP characteristics of low resistance and high polarizability of mineralized carbona- ceous sericite quartz schistis is the important prospecting indicator of the gold deposit in the mining area.