Alteration Fractural System and Orebody Locating in the Linglong Gold Field

doi:10.19657/j.geoscience.1000-8527.2024.096

Abstract

Abstract:

The Linglong granite occurs over a large area in the Linglong gold field, and its deformation at different crustal depths varies during metallogenesis.The rocks occurring in the shallow crust mainly show characteristics of brittle deformation.The fracture network within the main fault zone formed a tectonic system that controls the migration, precipitation, enrichment, and distribution of minerals.Meanwhile, the center of the tectonic system served as the main space for storing gold ore bodies.The deformation of rocks farther from the fault center gradually weakens, transitioning from fractured rocks to those with fewer reticulated fissures.These problems result in resource shortages in the gold mine.In this study, to accurately and effectively predict the positions of hidden gold orebodies in the Linglong gold field, we analyzed the correlations between the width of the typical alteration fracture network vein zone and the spatial positioning of the orebody.This analysis is based on dissecting the rock deformation mechanism and the corresponding relationship between rock deformation and tectonic development.Structural and statistical analyses of alteration fractures indicate that the density parameters of these fractures in the Linglong gold field can generally be used to determine the structural position of the observed rocks within the tectonic zones.This allows for the reference of deformation characteristics of rocks in hidden areas and the establishment of a spatial distribution model ore bodies and an alteration fracture system during mineralization.Moreover, this study can estimate the intensity of mineralization, as well as the size and occurrence of the ore body.Therefore, the degree of development of tectonic alteration fractures is a key indicator of geological information for deep prospecting and spatial positioning of orebodies.In addition, measuring and analyzing the density of alteration fractures in the structural mineralization zone, as well as understanding the distribution patterns of this density, can effectively locate the position of hidden ore bodies.Furthermore, this study enables estimates of the development degree and location of ore bodies, thereby achieving the goals of positioning and predicting these ore bodies.

Key words: brittle deformation, fracture density, orebody locating, Linglong gold field

CLC Number:

SHEN Yuke, GUO Tao, HAN Fengbin, XIAO Changhao, YAN Shaohua, LI Kang, LIU Weimin. Alteration Fractural System and Orebody Locating in the Linglong Gold Field[J]. Geoscience, 2024, 38(04): 1013-1025.

Figures/Tables 11

Fig.1 Map of the Zhaoping and Jiaojia faults showing the locations of major gold deposits[53]

Fig.2 Sketch map of the structures and geology of the Linglong gold field[53]

Fig.3 Section of fractures and orebodies in the Jiuqu deposit of the Linglong gold field

Fig.4 Photographs of the fracture density in the ore-body hangwall of the Jiuqu deposit in the Linglong gold field

Fig.5 Lower-hemisphere stereonet plot of the structural fracture occurrence of the Dongfeng mining area of the Ling-long gold field

Table 1 Statistics of alteration fractures at the No.171 vein in the Jiuqu mining area in Linglong Gold field

起始点距离	0	5	10	15	20	25	30	35	40	45	50	备注
裂隙线密度(条/m)	35	≥36	36	33	30	28	21	17	11	5	2	≥36难以统计
裂隙面密度(条/m²)	140	≥220	212	152	164	141	55	39	24	7	4	≥220难以统计

Fig.6 Fracture density curves

Fig.7 Cross-section of the structure and quartz veins in the Jiuqu deposit of the Linglong gold field

Fig.8 Cross-section of the alteration mineralization zone in the Jiuqu deposit of the Linglong gold field

Fig.9 Plane model map of the main and secondary ore-controlling structures in the Linglong gold field

Fig.10 Relationship between joint density and mineralization in the Linglong gold field

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