湖南沃溪金矿区及其外围烃汞叠加晕找矿方法的应用效果

doi:10.11720/wtyht.2021.1166

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Abstract

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.

Key words： hydrocarbon-mercury superposition anomaly geochemistry new method gold deposit Woxi Hunan

Received: 07 April 2020 Published: 29 April 2021

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	Hai-Long CHEN
	Qi-Peng XIAO
	Ju-Hong LIANG

Cite this article:

Hai-Long CHEN,Qi-Peng XIAO,Ju-Hong LIANG. The application of hydrocarbon and superimposed halo method to the Woxi gold deposit, Hunan Province[J]. Geophysical and Geochemical Exploration, 2021, 45(2): 266-280.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1166 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I2/266

Simplified geological map of structure
1—Cretaceous system;2—Sinian system;3—Wuqiangxi formation of Banxi group;4—Madiyi formation of Banxi group;5—Xiaomuping formation of Lengjiaxi group;6—alterated rock;7—unconformity surface; 8—normal fault;9—thrust fault;10—syncline;11—anticline

Cross section of line-87 in Yuershan Au,Sb,W deposit
1—Quaternary system;2—Wuqiangxi formation of Banxi group;3—Madiyi formation of Banxi group;4—drifting dust;5—slate;6—sandy slate;7—fault and number;8—vein and number;9—alterated rock

Content characteristics of hydrocarbon mercury with different granularity and horizon of sample

Hydrocarbon background values of Madiyi formation primary halo in mine district

Content ratios of geochemical indexs in soils and rocks of different strata in mine district (aenrichment cofficients)

Content characteristics of hydrocarbon and merury in different geobody in mine district

Calculation results of relevant parametersin Yuershan district

General graph of R-type cluster analysis of V₆-vein in Yuershan district

Sketch of element vertical zoning mode of V₆-vein in Yuershan district

Relevant parameters of soil elements in Yuershan district

Soil geochemistry profiles of line 87 in Yuershan district
1—Quaternary system;2—Wuqiangxi formation of Banxi group;3—Madiyi formation of Banxi group;4—drifting dust;5—slate;6—sandy slate;7—methane;8—ethane,propane;9—isobutane,N-butane,isopentane,N-contour;10—ethylene;11—propylene;12—fault and number;13—vein and number;14—alterated rock;15—sampling point

Soil geochemistry profiles of line 161 in Maerqiao district
1—Cretaceous system;2—Madiyi formation of Banxi group;3—graywacke;4—slate;5—methane;6—ethane,propane;7—isobutane,N-butane,isopentane,N-contour;8—ethylene;9—propylene;10—vein and number;11—alteration zone;12—sampling point

Relevant parameters of line 131 soil elements in Hongyanxi district

Soil geochemistry profiles of line 131 in Hongyanxi deposit
1—Quaternary system;2—Cretaceous system;3—Wuqiangxi formation of Banxi group;4—Madiyi formation of Banxi group;5—drifting dust;6—graywacke;7—slate;8—methane;9—ethane,propane;10—isobutane,N-butane,isopentane,N-contour;11—ethylene;12—propylene;13—fault and number;14—vein and number;15—alterated rock;16—sampling point

Relevant parameters of line 161 soil elements in Maerqiao district

Contrast value of each abnormal element of Hongyanxi-Ma'erqiao ore block

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