陕西省山阳县刘家峡金矿床构造控矿特征及综合找矿模型  

Integrated ore prospecting model and ore-controlling characteristics of Liujiaxia gold deposits of Shanyang County,Shaanxi Province

作　　者：樊忠平 陈小刚 张望 王卫 FAN Zhongping;CHEN Xiaogang;ZHANG Wang;WANG Wei(No.713 Party of Northwest GeoExploration Bureau for Nonferrous Metals,Shangluo 726000,Shaanxi,China)

机构地区：[1]商洛西北有色七一三总队有限公司,陕西商洛726000

出　　处：《矿产勘查》2023年第8期1367-1378,共12页Mineral Exploration

基　　金：中国地质调查局“全国重要矿集区找矿预测”子项目(DD2016005221);“矿集区矿产调查及深部找矿预测”子项目(DD2019057009)联合资助。

摘　　要：山阳县刘家峡金矿床矿体受北东—南西走向断裂构造控制,断裂构造呈等间距平行排列,在以北东向为主的断裂构造与早期近东西向节理密集带发育交汇部位富集成矿,节理发育程度越强,金矿化蚀变越强,金品位越高。矿体沿走向和倾向均呈透镜状产出,具有雁列展布、尖灭再现的特征。矿床硫同位素组成与花岗岩的硫同位素组成基本一致,反映刘家峡金矿的硫来自深源岩浆流体;Sm-Nd同位素年龄为(140.3±3.3)Ma,矿床成矿时代厘定为早白垩世,其成因类型为“浅成低温热液型”。根据矿床找矿标志及产出特征建立了矿床综合找矿模型,通过对矿床外围及深部地质特征的分析,类比已知矿带成矿控矿条件认为矿床外围及深部仍具有较大的找矿潜力,今后工作中需要重点关注。The orebody of Liujiaxia gold deposit in Shanyang County is controlled by the NE-SW trending fault structure,the fault structure is arranged in parallel with equal spacing,and the ore-forming area is enriched in the intersection of the east-trending fault structure in the north and the early near east-west joint dense zone.The stronger the degree of joint development,the stronger the gold mineralization alteration and the higher the gold grade.The orebodies are produced in lenticular shape along the strike and dip,with the characteristics of en echelon distribution and pinch-out recurrence.The sulfur isotopic composition of the deposit is basically consistent with that of the granite,which indicates that the sulfur of the Liujiaxia gold deposit comes from deep magmatic fluid.The Sm-Nd isotope age is(140.3±3.3)Ma,the metallogenic age of the deposit is determined to be the Early Cretaceous,and the genetic type is"epigenic cryohydrothermal type".The comprehensive prospecting model of the deposit is established according to the prospecting signs and production characteristics of the deposit.Through the analysis of the geological characteristics of the outer and deep parts of the deposit,it is concluded that the outer and deep parts of the deposit still have great prospecting potential,which needs to be paid more attention in the future.

关 键 词：找矿方向 找矿模型 控矿特征 构造 刘家峡金矿床 陕西山阳县 

分 类 号：P618.51[天文地球—矿床学]