隐伏铜矿区土壤微细粒测量有效性实验——以江西通江岭铜矿为例  

Validity Experiments of Fine-grained Soil Geochemical Survey for Exploring Concealed Copper Deposits:A Case Study in the Tongjiangling Copper Deposit,Jiangxi Province

作　　者：韩志轩[1] 张必敏[1] 乔宇 柳青青[1] 胡朗明 郭祥义 王永康 付海平 HAN Zhi-xuan;ZHANG Bi-min;QIAO Yu;LIU Qing-qing;HU Lang-ming;GUO Xiang-yi;WANG Yong-kang;FU Hai-ping(Key Laboratory of Geochemical Exploration,Ministry of Natural Resources,Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang,Hebei 065000;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083;Geophysical and Geochemical Exploration Party,Jiangxi Bureau of Geology and Mineral Exploration and Development,Nanchang,Jiangxi 330002)

机构地区：[1]自然资源部地球化学探测重点实验室,中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [2]中国地质大学(北京)地球科学与资源学院,北京100083 [3]江西省地质矿产勘查开发局物化探大队,江西南昌330002

出　　处：《地球学报》2020年第6期977-986,共10页Acta Geoscientica Sinica

基　　金：国家重点研发计划项目(编号:2016YFC0600608);中央级公益性科研院所基本科研业务费项目(编号:JYYWF201834,AS2019P02)联合资助。

摘　　要：土壤微细粒分离测量是一种可应用于隐伏矿勘查的地球化学技术,亟需开展多景观、多矿种有效性实验。本文以位于湿润低山丘陵区的江西通江岭铜矿为研究区,开展土壤微细粒分离测量试验,并讨论其异常形成机理。结果显示,主成矿元素Cu与Zn、Pb、Ag、Au等有较强的相关性,该组元素富集系数大、空间变异强,在研究区内趋于强烈富集。面积性试验结果显示Cu-Pb-Zn-Au多元素组合异常与已知矿体有良好对应关系。剖面试验表明断层和地层接触界面土壤成矿元素含量较高,Cu、Pb、Zn等异常可以指示隐伏矿体。根据元素组合及空间分布特征,预测研究区东部第四系覆盖区存在隐伏铜金矿体以及19线南段深部有隐伏多金属矿体,其中19号线南段在2019年详查工作中钻获铜铅锌多金属矿体。以上结果证实了低山丘陵景观区土壤微细粒测量探测隐伏矿床的有效性。断裂带、地层接触带既是容矿空间,也是深部成矿物质向地表迁移的主要通道,灰岩地层中的溶蚀缝与构造缝是次要迁移通道。深部成矿物质在多营力作用下迁移至地表,并被土壤微细粒中的铁锰氧化物、黏土矿物和无定型硅铝氧化物所捕获,在地表形成地球化学异常。Fine-grained soil survey is an effective penetrating geochemical exploration technique,but previous experiments of this method mainly focused on the arid basin or the grassland covered area in northern China.So it is urgent to carry out the applicability tests under different landscape conditions.In this paper,the fine-grained soil survey was carried out in the Tongjiangling copper deposit of Jiangxi Province,which is located in humid hills landscape,and the abnormal formation mechanism was discussed.The results show that the main metallogenic element Cu is strongly correlated with Zn,Pb,Ag,Au,which have large enrichment coefficient and strong spatial variation and tend to be strongly enriched in the study area.The results of areal test show that the abnormal combination of Cu-Pb-Zn-Au has a good correspondence with concealed known orebodies.The profile test shows that the ore-forming elements concentrations in the soil above the fault and contact interface between different strata are high,and the anomalies such as Cu,Pb and Zn can well indicate the concealed orebody.According to the characteristics of element combination and spatial distribution,it is inferred that there are concealed copper and gold orebodies in the eastern Quaternary overburden area of the study area and hidden polymetallic orebodies in the southern segment of No.19 line.In the south section of No.19 line,copper,lead and zinc polymetallic orebodies were drilled during the detailed survey in 2019.The above results confirm the validity of fine-grained soil survey in detecting hidden mineral deposits in the landscape of low hills areas.The fault zone and the stratigraphic contact zone are not only the space for ore storage but also the main channel for the migration of deep ore-forming materials to the surface.Dissolution and structural fractures in limestone strata seem to have been secondary migration channels.The deep ore-forming materials migrated to the surface under the action of polygenic forces and were captured by iron and manganese oxi

关 键 词：土壤微细粒测量 穿透性地球化学 异常形成机理 隐伏铜矿 

分 类 号：P632[天文地球—地质矿产勘探]