DU Lin1, TIAN Chao2*, ZHENG Ming-hong3, GUN Min-shan1, SU Yong-hu1, ZENG Fan-xiang1, YANG Zheng-kun1, CAI Jing-chen4
（1. Geological and Mineral Exploration Institute, Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou, Guiyang 550005, China;
2. 7st General Team, Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou, Guiyang 550000, China;
3. Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou, Guiyang 550005, China；4. 113 Geological Team, Bureau of Geology and Mineral Exploration and Development of Guizhou Province, Liupanshui 553000, China;）
Abstract: The northwestern Guizhou mineral concentration area is an important component of the Sichuan－Yunnan－Guizhou lead-zinc polymetallic mineralization area, and is also the main source of lead-zinc resources in Guizhou Province. At present, the surficial and shallowly buried lead-zinc ore bodies in the area have almost been mined out, and thus the prospecting target has been changed to the deeply concealed orebodies covered by thick bedrock. By using the conventional geochemical exploration method, it is difficult to obtain the information of deeply concealed orebodies, with no ideal mineral prospecting effect. In this paper, the deep-penetrating geochemistry exploration technology of the combination of organic hydrocarbon geochemistry and metal activity of the soil has been applied to test its effectiveness for prospecting deeply concealed resources in the Dapingzi lead-zinc deposit in the northwestern Guizhou by studying anomalies caused by hydrocarbon components and metal element activities in the soil, and then to evaluate the application prospect of this technology for mineral exploration. The results show that the developed hydrocarbon components in the soil of the Dapingzi lead-zinc deposit are characterized with dual bimodal and multimodal anomalies, and there are clear anomalies of the metal activity above orebodies and at surficial exposed positions of faulting structures. The organic hydrocarbon and metal activity of the soil can effectively indicate the faulting structure and reflect the information of deeply concealed lead-zinc orebodies. Through the comprehensive analysis, two abnormal targets were outlined in the No.12 and No.16 sections in the Dapingzi lead-zinc deposit. After the drilling engineering verification, one lead-zinc orebody with the thickness of 1.33m, Zn grade of 2.24%, and Pb grade of 0.44% has been found. It is speculated that the II-11 orebody could be extended to the depth. The application example shows that the deep-penetrating geochemistry exploration technology of the combination of organic hydrocarbon geochemistry and metal activity of the soil can be used to help the exploration of lead-zinc resources in the depth in the northwestern Guizhou, and has a good guiding significance and application prospect for prospecting and exploring deeply concealed lead-zinc resources.
Keywords: deep-penetrating geochemistry exploration technology; application for prospecting mineral resources; lead-zinc deposit; Dapingzi; the northwestern Guizhou
