The application of hydrocarbon and superimposed halo method to the Woxi gold deposit, Hunan Province
CHEN Hai-Long1(), XIAO Qi-Peng1, LIANG Ju-Hong2
1. Research Institute of Hunan Provincial Nonferrous Metal Geological Exploration Bureau, Changsha 410015, China 2. Hunan Chenzhou Mining Co.,Ltd.,Yuanling 419607,China
In order to solve the problem of deep prospecting in the Yuershanore ore block and its peripheral Hongyanxi-Ma'erqiaooreblock in the Woxi mining area, the authors carried out the tests of structural superimposition halo and hydrocarbon mercury comprehensive gas measurement in this area. Based on the study of the evolution law of hydrocarbon and mercury components in different geological bodies and different elevations and the characteristics of geochemical hydrocarbon and mercury anomalies formed in the upper soil of the orebody, the authors summarized the structure and superposition characteristics of soil geochemical anomaly field as well as the corresponding relationship with space so as to carry out the deep prospecting prediction. In addition, the test of the hydrocarbon and mercury superposition halo was carried out in the Hongyanxi-Ma'erqiao prediction areain the periphery. Based on the comprehensive study of prospecting methods, it is found that there are two different types of superposition fields in the soil geochemical field of Hongyanxi-Maherqiao ore block: one is deep source superposition field, where the correlation between Au and hydrocarbon components is good, the hydrocarbon anomaly components are complete, the Au and Hg anomalies are good, with deep source ore-forming hydrothermal superposition, and the deep prospecting potential is great; the other is syngenetic superposition field, where the correlation between Au and hydrocarbon components is poor, the element combination is relatively simple, and there is no hydrocarbon component anomaly, exhibiting little significance for ore prospecting.The hydrocarbon anomaly mode is dominated by dual bimodal anomaly mode, and there is a good hydrocarbon mercury comprehensive superposition anomaly in the low value area between the two peaks of hydrocarbon anomaly, indicating that there is a parallel blind vein in the depth. Drilling verification shows that the deep source superposition field has a gold orebody with a real thickness of 8.58 m and an average grade of 3.55×10-6 gold, while the syngenetic superposition field only has gold mineralization. Good prediction results have been achieved.
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doi: 10.11720/j.issn.1000-8918.2014.2.10
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