吉林省集安西岔金矿床成矿条件与成矿预测研究
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摘要
集安西岔金矿床位于吉林省东南部的集安县辖区内,成矿区划上位于华北陆块北缘东段太古宙—元古宙—中生代金银成矿区内,为该区内较为典型的层控蚀变岩型金矿,矿床规模属于中型。矿床的形成受含矿地层、断裂、岩浆岩等多种因素的制约,成矿围岩为石墨黑云母变粒岩,燕山期闪长岩活动是成矿的热动力源。矿体呈脉状、透镜状产出,直接受断裂构造控制,矿石构造以浸染状、脉状为主。对西岔金矿床的研究,主要有了以下几点认识：
(1)矿床的时空分布具有一定的规律性,成矿在空间上主要围绕复兴屯闪长岩的周围分布,成矿时代和燕山期闪长岩形成时代一致,该岩体的活动是矿区主要的成矿动力源。
(2)区域构造复杂,具多期次、继承性的特点。主要构造特征为区内的虾蠓沟—四道阳岔背斜穹窿被F7断裂切断,直接控矿构造为F7主断裂及其分枝断裂和与之平行的断裂,主要表现在对矿床的形成、矿床的空间分布的直接控制。
(3)西岔金矿床的成矿物质来源具有双重属性特征。成矿围岩清河组的两个亚组都遭受了不同程度的混合岩化作用。由于混合岩化作用,围岩为金成矿提供了部分物质来源,地层是重要的矿源层；矿区岩体发育、岩性复杂,通过对矿区内的硫同位素特征进行分析和岩浆岩中元素丰度分析,成矿物质除了来源于地层外,岩体也是重要的矿源。
(4)根据西岔金矿床的地质特征,总结出断裂附近的褐铁矿化、黄铁矿化石英脉及铁帽转石为主要找矿标志：硅化、碳酸盐化、毒砂黄铁矿化是重要的找矿标志。
(5)通过对找矿地质、地球物理、地球化学标志的总结,综合分析认为金家—金厂沟—西岔地段及亮红顶子—复兴屯—南岔地段及西岔金矿床矿体外围和深部具有良好的找矿前景。
Ji'an Xicha gold deposit is located in the southeast of Jilin province Ji'an county area, metallogenic zoning is located on the eastern section of the north margin of North China Craton Archean-Proterozoic Mesozoic gold mineralization area, as the area of typical strata-bound altered rock type gold deposit belongs to the medium, the size of. Deposits are formed by the ore-bearing strata, magmatic rocks, fracture and other factors, the host rock for the mineralization of graphite biotite leptynite. Yanshan Hercynian diorite activity metallogenic thermal power. The veined, lenticular output, directly controlled by faults, ore structure, give priority to with disseminated vein. The Xicha gold deposit study, mainly has the following several points:
(1)Deposits of the spatial and temporal distribution regularity of mineralization in space, mainly around the Renaissance Tuen diorite around distribution, metallogenic epoch and Yanshan Hercynian diorite formation time, the rock activity is mining area of the main metallogenic source.
(2)The regional structure is complex, with multiple stages, inherited characteristic. The main structure characteristics of the region for shrimp midge ditch-West Yang bifurcated anticlinal dome was F7breaks off, direct ore-controlling structure is F7main fault and its ramification of the fracture and in parallel with the fracture, mainly manifested in the formation of the deposit, deposit spatial distribution of direct control.
(3)The west fork of the ore forming material source has the dual attributes. Ore rock river two groups have suffered different degrees of migmatization. As a result of migmatization, surrounding rock for gold mineralization provided some material sources, formation is an important source bed; rock development, complex lithology, based on the sulfur isotopic characteristics were analyzed and the magmatic rocks in abundance analysis of ore-forming material sources, except in strata, rock is also an important source of ore.
(4)According to the west fork gold deposit geological characteristics, summed up the fracture near the Ferritization, pyritization quartz and iron stone as the main criteria for ore prospecting; silicified, carbonation, arsenopyrite pyrite mineralization is an important criteria for ore prospecting.
(5) Through to the prospecting of geological, geophysical, geochemical markers of the summary, comprehensive analysis of Jinchanggou gold-west fork area and bright red roof-Renaissance Village-Nancha lots and west fork of ore bodies peripheral and deep and has good ore prospects.
(1)矿床的时空分布具有一定的规律性,成矿在空间上主要围绕复兴屯闪长岩的周围分布,成矿时代和燕山期闪长岩形成时代一致,该岩体的活动是矿区主要的成矿动力源。
(2)区域构造复杂,具多期次、继承性的特点。主要构造特征为区内的虾蠓沟—四道阳岔背斜穹窿被F7断裂切断,直接控矿构造为F7主断裂及其分枝断裂和与之平行的断裂,主要表现在对矿床的形成、矿床的空间分布的直接控制。
(3)西岔金矿床的成矿物质来源具有双重属性特征。成矿围岩清河组的两个亚组都遭受了不同程度的混合岩化作用。由于混合岩化作用,围岩为金成矿提供了部分物质来源,地层是重要的矿源层；矿区岩体发育、岩性复杂,通过对矿区内的硫同位素特征进行分析和岩浆岩中元素丰度分析,成矿物质除了来源于地层外,岩体也是重要的矿源。
(4)根据西岔金矿床的地质特征,总结出断裂附近的褐铁矿化、黄铁矿化石英脉及铁帽转石为主要找矿标志：硅化、碳酸盐化、毒砂黄铁矿化是重要的找矿标志。
(5)通过对找矿地质、地球物理、地球化学标志的总结,综合分析认为金家—金厂沟—西岔地段及亮红顶子—复兴屯—南岔地段及西岔金矿床矿体外围和深部具有良好的找矿前景。
Ji'an Xicha gold deposit is located in the southeast of Jilin province Ji'an county area, metallogenic zoning is located on the eastern section of the north margin of North China Craton Archean-Proterozoic Mesozoic gold mineralization area, as the area of typical strata-bound altered rock type gold deposit belongs to the medium, the size of. Deposits are formed by the ore-bearing strata, magmatic rocks, fracture and other factors, the host rock for the mineralization of graphite biotite leptynite. Yanshan Hercynian diorite activity metallogenic thermal power. The veined, lenticular output, directly controlled by faults, ore structure, give priority to with disseminated vein. The Xicha gold deposit study, mainly has the following several points:
(1)Deposits of the spatial and temporal distribution regularity of mineralization in space, mainly around the Renaissance Tuen diorite around distribution, metallogenic epoch and Yanshan Hercynian diorite formation time, the rock activity is mining area of the main metallogenic source.
(2)The regional structure is complex, with multiple stages, inherited characteristic. The main structure characteristics of the region for shrimp midge ditch-West Yang bifurcated anticlinal dome was F7breaks off, direct ore-controlling structure is F7main fault and its ramification of the fracture and in parallel with the fracture, mainly manifested in the formation of the deposit, deposit spatial distribution of direct control.
(3)The west fork of the ore forming material source has the dual attributes. Ore rock river two groups have suffered different degrees of migmatization. As a result of migmatization, surrounding rock for gold mineralization provided some material sources, formation is an important source bed; rock development, complex lithology, based on the sulfur isotopic characteristics were analyzed and the magmatic rocks in abundance analysis of ore-forming material sources, except in strata, rock is also an important source of ore.
(4)According to the west fork gold deposit geological characteristics, summed up the fracture near the Ferritization, pyritization quartz and iron stone as the main criteria for ore prospecting; silicified, carbonation, arsenopyrite pyrite mineralization is an important criteria for ore prospecting.
(5) Through to the prospecting of geological, geophysical, geochemical markers of the summary, comprehensive analysis of Jinchanggou gold-west fork area and bright red roof-Renaissance Village-Nancha lots and west fork of ore bodies peripheral and deep and has good ore prospects.
引文
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