摘要
选择甘南地区勘查程度达到详查、研究程度较高的大水、早子沟、拉尔玛3个大型、超大型典型金矿床为研究对象,在简要介绍甘南地区区域地质概况及3个典型金矿矿区、矿体特征及勘查程度的基础上,重点总结、提炼了3个金矿的找矿标志和找矿模型,兼顾分析总结了有效的勘查方法手段。认为3个金矿床较高的勘查程度为找矿标志、找矿模型的总结研究提供了良好的基础;断裂破碎带、以闪长玢岩或花岗闪长(斑)岩为主的中酸性岩脉及Au、As、Hg、Sb元素土壤化探异常和强硅化,是3个金矿的共性找矿标志;反映地质-地球化学找矿模型的主要地质、地球化学要素为断裂、中酸性岩脉、硅化和以Au、Sb元素为主的低温异常组合;大比例地质填图、1∶1万土壤测量及地表探槽揭露化探异常、钻探、硐探系统控制矿化带及矿体是3个金矿的有效勘查方法手段。研究成果对甘南地区或相似区域的金矿找矿和深部勘查工作应具有一定的参考意义,可为类似矿区的勘查工作部署和工程布置提供参考。
on the basis of brief introduction of the geological and regional overview of South Gansu region and the characteristics of orebody and the degree of exploration in the three mining areas,the prospecting indicators and models of the three gold deposits are summarized and refined,and the effective exploration methods are also analyzed and summarized as well.It is believed that the high exploration degree of the three gold deposits provides a good basis for the summary and research of the prospecting indicator and model.The fault fracture zone,diorite porphyrite or granodiorite(porphyry)as the main medium acid dyke,and the geochemical soil anomaly of Au,As,Hg,Sb and strong siliconization are the common ore prospecting signs of the three gold deposits.The main geochemical and geological factors reflecting the geological and geochemical prospecting model are fault,intermediate-acid dyke,siliconization and low temperature anomaly combination dominated by Au and Sb.Large-scale geological mapping,1∶10,000 geological soil survey and the system of surface trench,drilling hole and tunnel to control mineralization zone and orebody are the effective exploration methods for the three gold mines.The research results should have the certain reference significance for the gold exploration and prospecting in the deep area in South Gansu or similar areas,and can provide a reference for the exploration work deployment and engineering layout in the similar mines.
作者
陈耀宇
CHEN Yaoyu(The Third Institute Geological and Mineral Exploraton of Gansu Provinical Bureau of Geology and Mineral Resourses,Lanzhou 730050,Gansu,China)
出处
《矿产与地质》
2020年第1期7-18,共12页
Mineral Resources and Geology
基金
中国地质调查局中国矿产地质志项目(编号:DD20160346、DD20190379)资助。
关键词
找矿标志
找矿模型
大水金矿
早子沟金矿
拉尔玛金矿
甘南地区
ore-prospecting indicator
ore-prospecting model
Dashui gold deposit
Zaozigou gold deposit
Laerma gold deposit
South Gansu
