玲珑金矿田蚀变裂隙系统分析与矿体定位预测

doi:10.19657/j.geoscience.1000-8527.2024.096

摘要/Abstract

摘要：

玲珑金矿田区域范围内发育大面积的玲珑花岗岩,成矿期构造作用过程中,处于浅部的岩石常常是以脆性变形为主,形成以主断裂带为核心的构造裂隙网络体系,控制成矿物质的运移、沉淀、富集与分布。同时,构造带中心也是金矿体赋存的主要构造空间;远离构造带中心部位的岩石变形逐渐减弱,从碎裂岩逐渐过渡到网脉状裂隙密度减少。为了方便、快捷、准确、有效地开展玲珑金矿田盲矿体定位预测,发现有价值工业金矿体,缓解老旧危机矿山资源不足的状况,在解剖岩石变形机制及岩石变形与构造发育之间的对应关系等基础上,开展玲珑金矿田典型蚀变裂隙网脉带的宽度与矿体的空间定位相关性统计分析。构造剖析及蚀变裂隙统计分析结果表明,在玲珑金矿田,蚀变裂隙网脉密度参数可以大致判断所观察的岩石在构造带所处的构造部位,进而推断隐伏区岩石的变形特征,建立玲珑金矿田矿化蚀变带成矿期蚀变裂隙系统与矿体空间分布模式。同时,可以推测成矿作用的强度、矿体大小和矿体赋存部位。构造蚀变裂隙网脉的发育程度是开展深部找矿预测和矿体空间定位预测的标志性地质信息。开展构造矿化带内蚀变裂隙密度测量统计,总结构造蚀变裂隙密度分布规律,可以有效开展盲矿体及深部找矿预测,推测矿体的发育程度与赋存部位,达到对矿体进行定位预测的目的。

关键词: 脆性变形, 裂隙密度, 矿体空间定位, 玲珑金矿田

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

中图分类号:

申玉科, 郭涛, 韩凤彬, 肖昌浩, 闫少华, 李康, 刘维民. 玲珑金矿田蚀变裂隙系统分析与矿体定位预测[J]. 现代地质, 2024, 38(04): 1013-1025.

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.

图/表 11

图1 招平断裂带、焦家断裂带主要金矿床分布图[53] 1. 第四系;2.元古宙地层;3.太古宙地层;4.玲珑黑云母花岗岩;5.滦家河二长花岗岩;6.郭家岭花岗闪长岩;7.艾山花岗岩;8.断裂;9.金矿床;10.地名

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

图2 玲珑金矿田构造地质图[53]

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

图3 玲珑金矿田九曲矿区-660中段节理密度与矿体空间关系巷道剖面图

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

图4 玲珑金矿田九曲矿区某中段矿体上盘节理密度照片

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

图5 玲珑金矿田东风矿区构造裂隙产状吴氏网投影图

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

表1 玲珑金矿田九曲矿区M中段171号脉蚀变裂隙统计

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

图6 裂隙密度曲线

Fig.6 Fracture density curves

图7 玲珑金矿九曲分矿构造矿化带剖面图

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

图8 玲珑金矿田九曲分矿金矿脉蚀变矿化带剖面图

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

图9 玲珑金矿田主次构造控矿平面模式图(A-B剖面线)1. 玲珑花岗岩;2.构造蚀变岩带;3.金矿体;4.剖面位置

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

图10 玲珑金矿田节理密度与矿化关系模式图

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

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