Geophysical Characteristics and Pb-Zn Ore-controlling Structures in Northwestern Guizhou

doi:10.19657/j.geoscience.1000-8527.2019.02.08

Abstract

Abstract:

Northwestern Guizhou is located in the Wumengshan gravity gradient belt of Sichuan-Guizhou-Yunnan Pb-Zn metallogenic domain. The domain is characterized by complex geological structure and geophysical anomalies, with low degree of research and substantial exploration potential. In recent years, the discovery of the large and super-large Pb-Zn deposits at Wuzhishan and Zhugongtang indicates huge potential of super-large Pb-Zn discovery in this region. Based on surficial geological survey, and regional gravity, aeromagnetic and 1:50k ground magnetic survey, major shallow and deep faults were delineated in this study. The results show the coupling relationship between the Pb-Zn deposits and the inferred deep and shallow faults. The typical ore-controlling fault F₁ cut fault F₂(in Lizigou, Weining, NW Guizhou) are NW- and NE-trending, respectively. In Yinajia-Xiaomaochang area, the two roughly parallel NE-trending faults (F₁₀, F₁₁) are both ore-controlling. Comprehensive analysis of regional geological data shows out that the deep and shallow faults are the main ore-forming/-hosting and ore-hosting structures, respectively, and the former are permissive to the formation of large to super large Pb-Zn deposits. It is speculated that the area around the major faults (F₁-F₁₆) can be a high potential area for Pb-Zn prospecting.

Key words: gravity and magnetic field, ground magnetic survey, deep fault, shallow fault, Pb-Zn deposit, northwestern Guizhou

CLC Number:

P542

WANG Liang, ZHANG Jiawei, XIANG Kunpeng, CHEN Guoyong, HU Congliang, ZHANG Chen. Geophysical Characteristics and Pb-Zn Ore-controlling Structures in Northwestern Guizhou[J]. Geoscience, 2019, 33(02): 325-336.

Figures/Tables 8

Fig.1 Geologic and tectonic map of northwestern Guizhou

Fig.2 Regional structural map of the Pb-Zn metallogenic domain in northwestern Guizhou and northeastern Yunnan

Fig.3 Relationship between the residual gravity anomaly(a),aeromagnetic anomalies(b) and inferred deep fault for Pb-Zn deposits in northwestern Guizhou

Fig.4 1:50k geomagnetic anomalies and partition diagram of Shuicheng-Weining-Yunguiqiao-Yinchangpo area in northwestern Guizhou

Fig.5 1:50k geomagnetic anomalies and partition diagram of Yinajia-Xiaomaochang area in northwestern Guizhou

Fig.6 Relationship between the inferred deep and basement faults and Pb-Zn deposit in northwestern Guizhou

Fig.7 Relationship between surface faults(a),inferred shallow faults (b) and Pb-Zn deposits of Shuicheng-Weining-Yunguiqiao-Yinchangpo area in northwestern Guizhou

Fig.8 Relationship between surface faults(a),inferred shallow faults (b) and Pb-Zn deposits of Yinajia-Xiaomaochang area in northwestern Guizhou

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