Three-dimensional geological modeling and deep prospectivity of the Xigou Pb-Zn-Ag-Au deposit, Henan Province

doi:10.13745/j.esf.sf.2021.1.21

Abstract

Abstract:

With decreasing shallow mineral ore deposits in mining zones, more attention is paid to deep prospectivity as three-dimensional geological modeling technology becomes widely used in metallogenic prediction and quantitative resource evaluation. Based on geological mapping and drilling as well as geological data on the stratigraphy, lithology, structure and grade of the sampling site, we performed 3D geological modeling and geostatistical analysis using GOCAD to construct the 3D structual, orebody and stratigraphic models of the Xigou Pb-Zn-Ag-Au deposit. On the basis of the constructed geological models, a 3D attribute model of the deposit was constructed using the discrete smooth interpolation and Kriging interpolation methods, and then three prospecting targets in the mining area were delineated and evaluated. The geological knowledge-based 3D modeling study reveals: (1) The favorable indicators for ore prospecting in the Xigou Pb-Zn-Ag-Au deposit are stratum, structure, gabbro and grade. (2) The prediction method based on 3D geological modeling is scientific and effective. (3) The mid and southeast deep areas of the S139 orebody have good mineral prospecting potentials. This paper provides a reference for future breakthroughs in deep prospecting.

Key words: 3D geological modeling, metallogenic prediction, 3D grade model, deep prospectivity, Xigou Pb-Zn-Ag-Au deposit

CLC Number:

P597

JIA Ran, WANG Haoran, WANG Gongwen, WANG Hao, XU Rongda, FENG Zhankui, SONG Yaowu, WANG Xiaoling, PANG Zong. Three-dimensional geological modeling and deep prospectivity of the Xigou Pb-Zn-Ag-Au deposit, Henan Province[J]. Earth Science Frontiers, 2021, 28(3): 156-169.

Figures/Tables 15

Fig.1 Metallogenic map of the Luanchuan district. Modified after [19].

Fig.2 Schematic geological, metallogenic, engineering map of the Xigou Pb-Zn-Ag-Au deposit

Fig.3 Ore types in the Xigou Pb-Zn-Ag-Au deposit

Fig.4 Surface-borehole 3D model of the Xigou deposit

Fig.5 3D models of geological objects in the Xigou deposit

Fig.6 3D stratigraphic model of the Xigou deposit

Fig.7 Stereoview of the spatial location of fault structures and orebodies in the Xigou deposit

Fig.8 Stereoviews of S130 orebody and borehole drilling along exploration line 16

Fig.9 Results of PCA analysis of 24 elements in borehole samples collected at different altitudes on exploration line 16

Fig.10 Results of cluster analysis of 7 major elements in boreholes on exploration line 16

Fig.11 Plots of variation of Pb/Zn ratio with altitude for boreholes on exploration line 16

Fig.12 The ore grade model based on DSI and Ordinary Kriging interpolation

Fig.13 1:10000 3D models of geological objects in the Chitudian orefield. Modified after [10].

Fig.14 1:10000 CSAMT image and 3D structural geological model of the Chitudian orefield. Modified after [10].

Fig.15 The metallogenic prediction model of the Xigou Pb-Zn-Ag-Au deposit

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