| 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 |
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| 关键词:fine-grained soil geochemical survey deep-penetrating geochemistry formation mechanism of anomalies concealed copper deposit |
| 基金项目: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) |
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| Validity Experiments of Fine-grained Soil Geochemical Survey for Exploring Concealed Copper Deposits:A Case Study in the Tongjiangling Copper Deposit, Jiangxi Province |
| 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 oxides, clay minerals and amorphous silica-aluminum oxides in the fine soil, forming anomalies on the surface. |
| HAN Zhi-xuan,ZHANG Bi-min,QIAO Yu,LIU Qing-qing,HU Lang-ming,GUO Xiang-yi,WANG Yong-kang,FU Hai-ping.2020.Validity Experiments of Fine-grained Soil Geochemical Survey for Exploring Concealed Copper Deposits:A Case Study in the Tongjiangling Copper Deposit, Jiangxi Province[J].Acta Geoscientica Sinica,41(6):977-986. |
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