甘肃省寨上金矿床原生地球化学晕特征及其地质意义  

The Primary Halo Research of Zhaishang Gold Deposit in Gansu Province

作　　者：郝迪 孙彪 孟菲蓉 HAO Di;SUN Biao;MENG Feirong(Xi'an Center of Mineral Resources Survey, China Geological Survey, Xi'an 710100, Shaanxi, China)

机构地区：[1]中国地质调查局西安矿产资源调查中心,陕西西安710100

出　　处：《西北地质》2021年第4期88-99,共12页Northwestern Geology

基　　金：中国地质调查局“甘肃寨上金矿岩金普查”项目(DD20191018)。

摘　　要：运用数学地质、地球化学等理论与方法,对甘肃寨上超大型、类卡林型金矿床元素分布和原生晕特征等进行研究后认为:南、北矿带Au、As、Sb元素异常与成矿关系密切,组合异常可作为寨上金矿床的直接找矿标志;以As、Sb为前缘晕指示元素,Au、Ag、Pb、Zn为近矿晕指示元素,W、Mo为尾晕指示元素,各勘探线分带特征显示,矿脉中存在2期成矿作用形成的矿体A和矿体B,在轴向上存在复杂的叠加和分离形态,走向上也存在尖灭再现。建立北矿带10号脉、南矿带32号脉的原生叠加晕理想模型:10号矿脉在2650~2350 m中段A矿体尾部与B矿体头部或中部叠加,矿体在2350 m以下仍有较大延伸;32号脉在2650~2300 m中段A矿体与B矿体中部及尾部叠加,2300 m中段接近矿体底部。根据原生叠加晕找矿预测“前尾共存”及“参数反转”准则,圈定3个找矿靶区。On the basis of geo-mathematic method and geochemical theories,this paper studied the elements distribution and the primary halo of the Zhaishang ultra-large carlin-like type gold deposit.It was held that the anomalies of Au,As,Sb were related to ore-forming process of gold and could be direct prospecting criteria for gold deposit.The front halo elements were Sb,As;the near-ore halo elements were Au,Ag,Pb,Zn;the rear halo elements were W,Mo.Two ore bodies of the ore veins in stageⅡmineralization superposed in different exploration lines and altitudes.The ideal model of the primary superimposed halo of the northern No.10 ore vein and the southern No.32 ore vein was built.In the No.10 ore vein from the 2650 m down to the 2350 m,the tail of ore body A was superposed upon the top of ore body B,even extending deep down in 2350 m.In the middle of No.32 ore vein from the 2650 m down to the 2300 m,ore body A and B were superposed in the middle and the tail,extending to the bottom of the ore body in 2350 m.Three prospecting target areas were delineated depending on the primary halo prospecting principles.

关 键 词：数学地质分析 原生叠加晕理想找矿模型 原生晕找矿准则 寨上金矿 甘肃 

分 类 号：P618.51[天文地球—矿床学] P632[天文地球—地质学]