地球化学勘查在早子沟金矿中的应用及启示  

Application and enlightenment of the geochemical exploration in Zaozigou gold deposit

作　　者：严康 唐源壑 郭文弟 张瑞 李康宁 徐永利 YAN Kang;TANG Yuanhe;GUO Wendi;ZHANG Rui;LI Kangning;XU Yongli(Xi an Center of Mineral Resources Survey,China Geological Survey,Shaanxi Xi an 710100,China;Technology Innovation Center for Gold Ore Exploration,China Geological Survey,Shaanxi Xi an 710100,China;The Third Geological and Mineral Exploration Institute of Gansu Bureau of Geology and Mineral Resources,Gansu Lanzhou 730050,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 [2]中国地质调查局金矿勘查技术创新中心,陕西西安710100 [3]甘肃省地质矿产勘查开发局第三地质矿产勘查院,甘肃兰州730050

出　　处：《中国地质调查》2024年第5期120-128,共9页Geological Survey of China

基　　金：中华人民共和国科学技术部“深部矿产资源三维找矿预测评价示范(编号:2017YFC0601506)”;中国地质调查局“甘肃李子园—花崖沟金矿重点调查区调查评价(编号:DD20242984)”;“秦岭—豫西地区战略性矿产调查(编号:DD20240019)”项目联合资助。

摘　　要：早子沟金矿位于西秦岭造山带的西北部,植被发育,基岩出露较差,地球化学勘查是区域最有效的勘查方法之一。在系统梳理早子沟金矿1∶20万、1∶5万水系沉积物测量及1∶1万土壤测量地球化学特征的基础上,结合深部钻孔SK8314原生晕特征,发现Au元素与Sb、As、Hg、Ag、Cu等元素具有正相关性,特别是Au、Sb元素组合是金矿找矿的直接地球化学标志,深部原生晕分带序列为Bi-Cu-Mo-Sb-Ag-Au-W-As-Sn-Zn-Cd-Pb-Cr-Ni-Co-Hg,尾晕元素Bi和近矿晕元素Cu位于分带序列前缘晕,Pb、Zn元素位于分带序列尾晕,表明矿体具有多期成矿叠加特征,深部可能存在盲矿体。同时在钻孔SK8314孔深1850 m以下,随着深度增大,地球化学参数(As+Sb)/(Bi+Mo)值和100·Sb/(Bi·Mo)值呈现逐渐增大的趋势,指示深部可能存在盲矿体,依然具有较大的找矿空间。研究成果可为早子沟金矿的深部及外围找矿提供参考。Zaozigou gold deposit is located in the northwest of West Qinling orogenic belt,with well-developed vegetation and poor bedrock outcropping.The geochemical exploration is one of the most effective exploration methods in the region.On the basis of systematically combing the geochemical characteristics of 1∶200,000 and 1∶50,000 water sediment measurements and 1∶10,000 soil measurements of Zaozigou gold deposit,the authors found that Au has a positive correlation with Sb,As,Hg,Ag and Cu,combined with the characteristics of the primary halo of the deep borehole SK8314.Especially,the combination of Au and Sb is a direct geochemical marker for gold prospecting.The deep primary halo zoning sequence is Bi-Cu-Mo-Sb-Ag-Au-W-As-Sn-Zn-Cd-Pb-Cr-Ni-Co-Hg,and Bi is located in the leading halo of the zoning sequence.Cu is located in the leading halo of the zoning sequence,and Pb and Zn are located in the tail halo of the zoning sequence,indicating that the ore body has the characteristics of multi-stage metallogenic superposition,probably with blind ore body in the depth.At the same time,the ratios of geochemical parameters(As+Sb)/(Bi+Mo)and 100·Sb/(Bi·Mo)gradually increased with the increasing depth at hole SK8314 below 1850 m,indicating blind ore bodies in the deeper part and a large prospecting space.The research results could provide some references for deep and peripheral prospecting in Zaozigou.

关 键 词：水系沉积物测量 土壤测量 原生晕 早子沟金矿 

分 类 号：P618.51[天文地球—矿床学]