玲珑金矿田蚀变裂隙系统分析与矿体定位预测

Alteration Fractural System and Orebody Locating in the Linglong Gold Field

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。

The Linglong granite occurs over a large area in the Linglong gold field,and its deformation at differ-ent crustal depths varies during metallogenesis.The rocks occurring in the shallow crust mainly show character-istics of brittle deformation.The fracture network within the main fault zone formed a tectonic system that con-trols the migration,precipitation,enrichment,and distribution of minerals.Meanwhile,the center of the tec-tonic 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 prob-lems result in resource shortages in the gold mine.In this study,to accurately and effectively predict the posi-tions 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 tec-tonic 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 ob-served 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 indica-tor 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.