Citation: | GONG Hongsheng, HAN Runsheng, LI Ziteng, REN Tao, LI Wenyao, WANG Jiasheng, CHEN Gang. 2020. Element association anomaly of tectonites and prediction of concealed deposit in the Xiaozhuqing exploration area on the periphery of Huize lead-zinc mine area, northeastern Yunnan Province. Journal of Geomechanics, 26(3): 419-431. doi: 10.12090/j.issn.1006-6616.2020.26.03.036 |
The Huize super-large Ge-rich Pb-Zn deposit in Yunnan is located on the southwestern margin of the Yangtze block and east of the Xiaojiang deep fault in Sichuan-Yunnan-Guizhou lead-zinc metallogenic areas, and it is controlled by the NE-trending thrust-fold structures. Although the Huize Pb-Zn deposit has a high research level, the geological research level of the Xiaozhuqing exploration area, which is a key prospecting area on the periphery of the mining area, is relatively low. According to the prospecting method of Metal-element association halos within mineralization-related fault zones(MEAHFZ), through geological survey and structural analysis, it is considered that the Xiaozhuqing exploration area has good metallogenic geological conditions, and its tectonic style is the fault-fold structures composed of the Yinchangpo sinistral oblique strike-slip fault and its hanging wall inverted and tilted anticline, which is basically consistent with the ore-controlling structural style of the Kuangshanchang deposit and Qilinchang deposit. Combined with previous research results, it is determined that the structural system in the exploration area has developed from the NE structural zone to the late SN structural zone to the EW structural zone since the Indosinian period. On this basis, based on the 1:10000 tectono-geochemistry, altered lithofacies mapping and gravity profile survey, a comprehensive map of Pb-Zn-Cd element combination anomaly and Pb, Zn single element anomaly is drawn. Combined with the gravity anomaly in this area, it is found that the comprehensive anomalies distribute along the NE-directed compressive and torsional interlayer fault zone in the Upper Sinian Dengying Formation and Lower Carboniferous Baizuo Formation of the hanging wall of Yinchangpo fault, and the key prospecting target areas I, Ⅱ and Ⅲ are delineated. This achievement not only indicates the direction for the exploration and verification of the exploration area, but also has important guiding significance for the prospecting prediction of similar deep and peripheral deposits.
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Geological sketch map of the Huize Pb-Zn mine area
Profile showing the thrust-fold structures and deposits in the Huize Pb-Zn mine area(modified after Han et al., 2012)
Geological map of the Xiaozhuqing exploration area
Sketch and mechanical analysis of the fracture point YP-3 in the NE-trending fracture
Sketch and mechanical analysis of the fracture point XZ71 in the NE-trending fracture
Sketch and mechanical analysis of the fracture point YP-8 in the SN-trending fracture
Sketch and mechanical analysis of the fracture point XZ18 in the EW-trending fracture
Sketch and mechanical analysis of the fracture point XZ134 in the NE-trending fracture
Diagram showing the tectonic deformation and evolution since the Indosinian period in the Xiaozhuqing exploration area (modified after Han et al., 2014)
Geological map of F2、F3、F4 element combination anomaly in the Xiaozhuqing exploration area
Prediction map of the target prospecting area in the Xiaozhuqing exploration area