大别山南部石人寨金矿矿床成因及找矿潜力
发布时间：2018-08-30 20:39
【摘要】：桐柏-大别山地区位于华北地块和扬子地块之间,是秦岭复合造山带的东延部分,以桐柏-商城和新城-浠水一级剪切带为界,平行造山带走向分为北淮阳、桐柏-大别褶皱带(大别山)和随州-宿松-张八岭三个构造单元。区域上已探明十余个大中型金(银)矿床。石人寨研究区位于南大别山,大地构造位置处于郯庐断裂带与襄樊-广济断裂带交汇所形成的三角形破碎区的北部。区内金矿床(点)分布较多,规模基本上都为小型矿床。本文依托2014年湖北省蕲春县石人寨矿区1:10000地质矿产调查最新成果,在简要分析了区域地质及成矿背景的基础上,通过对石人寨金矿床的地质、流体包裹体、地球化学等特征的研究,并与区域典型金矿床成矿特征进行对比,确定主要控矿因素及控矿特征,分析成矿流体性质,讨论了成矿物质来源及矿床成因,初步建立了成矿模式。结合研究区地质及化探成果,总结区域上金的富集规律,确定了找矿有利区带。主要取得了以下几点认识:1.确认了研究区内两条重要的剪切带(刘河剪切带和莲花剪切带)的地质特征,发现区内大部分岩体、岩脉、石英脉和含金石英脉都按照剪切带展布,说明了剪切带是该地区岩体和金矿产出的主要控制因素。2.通过对石人寨地区剪切带的分布、规模和变形特征的研究,认为研究区内的剪切带总体以脆韧性变形为主。根据各变形组构的交切、穿插、复合叠加关系等几何学、运动学特征,并结合区域构造,将剪切带的构造演化期次分为三期,讨论了其控矿的机理,认为在剪切带脆韧性阶段,区域上金进行了初步富集。3.对石人寨金矿床成矿期次进行研究,将成矿阶段分为:黄铁矿-石英阶段,石英-多金属硫化物阶段和碳酸盐-重晶石阶段,其中第二阶段是Au形成的主要时期。通过对含金石英脉的流体包裹体分析,认为成矿物质来源于流体对围岩的萃取和深部物质。成矿流体属CO2-H2O±N2±H2±CH4体系,性质为变质水与岩浆期后热液混合多成因型。4.与区域上典型金矿床的大地构造背景、矿床地质特征、成矿流体性质的分析对比,表明石人寨金矿床的成因属中浅成中温热液石英脉型金矿,类似伸展造山型金矿。5.根据本文对石人寨金矿床地质特征和控矿因素的研究,结合区内地质、化探资料,认为马家湾地区具有一定的成矿潜力。
[Abstract]:The Tongba-Dabie Mountain area is located between the North China block and the Yangtze block. It is the eastward extension of the Qinling complex orogenic belt. The parallel orogenic belt is divided into North Huaiyang along the lines of Tongbai Shangcheng and Xincheng Xishui first-order shear zones. Tongbai-Dabie fold belt (Dabie Mountain) and Suizhou-Susong-Zhangbaling three tectonic units. More than ten large and medium-sized gold (silver) deposits have been discovered in the region. The study area of Shirenzhai is located in the South Dabie Mountains and the tectonic position is in the north of the triangle fracture zone formed by the intersection of the Tanlu fault zone and the Xiangfan-Guangji fault zone. There are many gold deposits (points) in this area, and the scale is basically small deposits. Based on the latest survey results of 1: 10000 geological and mineral resources in Shirenzhai mining area, Qichun County, Hubei Province in 2014, and on the basis of a brief analysis of regional geology and metallogenic background, the geological and fluid inclusions of Shirenzhai gold deposit are analyzed in this paper. The main ore-controlling factors and ore-controlling characteristics are determined, the ore-forming fluid properties are analyzed, the source of ore-forming material and the genesis of the deposit are discussed, and the metallogenic model is preliminarily established. Combined with the geological and geochemical exploration results in the study area, the enrichment law of gold in the region is summarized, and the favorable ore prospecting zone is determined. The main points are as follows: 1. The geological characteristics of two important shear zones (Liuhe shear zone and Lianhua shear zone) in the study area are confirmed. It is found that most of the rock masses, veins, quartz veins and gold-bearing quartz veins are distributed according to the shear zone, The shear zone is the main controlling factor of rock mass and gold deposit in this area. Through the study of the distribution, scale and deformation characteristics of shear zone in Shirenzhai area, it is considered that the main shear zone in the study area is brittle and ductile deformation. According to the geometries and kinematics characteristics of each deformed fabric, such as intersecting, interweaving, composite superposition, and combining with regional tectonics, the tectonic evolution stages of the shear zone are divided into three stages. The mechanism of ore-controlling is discussed, and it is considered that in the brittleness stage of the shear zone, The gold in the region was preliminarily enriched. The metallogenic stages of Shirenzhai gold deposit are studied. The metallogenic stages are divided into pyrite-quartz stage, quartz-polymetallic sulfide stage and carbonate-barite stage. The second stage is the main stage of Au formation. By analyzing the fluid inclusions of gold bearing quartz veins, it is concluded that the ore-forming materials are derived from fluid extraction of surrounding rock and deep materials. The ore-forming fluid belongs to the CO2-H2O 卤N2 卤H2 卤CH4 system, which is characterized by multi-genetic mixing of metamorphic water and post-magmatic hydrothermal fluid. Comparing with the tectonic setting, geological characteristics and ore-forming fluid properties of typical gold deposits in the region, it is shown that the origin of Shirenzhai gold deposit belongs to medium-shallow hydrothermal quartz vein type gold deposit, similar to extensional orogenic type gold deposit .5. Based on the study of geological characteristics and ore-controlling factors of Shirenzhai gold deposit, combined with geological and geochemical data in the area, it is considered that the Majiawan area has a certain metallogenic potential.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.51
本文编号：2214227
[Abstract]:The Tongba-Dabie Mountain area is located between the North China block and the Yangtze block. It is the eastward extension of the Qinling complex orogenic belt. The parallel orogenic belt is divided into North Huaiyang along the lines of Tongbai Shangcheng and Xincheng Xishui first-order shear zones. Tongbai-Dabie fold belt (Dabie Mountain) and Suizhou-Susong-Zhangbaling three tectonic units. More than ten large and medium-sized gold (silver) deposits have been discovered in the region. The study area of Shirenzhai is located in the South Dabie Mountains and the tectonic position is in the north of the triangle fracture zone formed by the intersection of the Tanlu fault zone and the Xiangfan-Guangji fault zone. There are many gold deposits (points) in this area, and the scale is basically small deposits. Based on the latest survey results of 1: 10000 geological and mineral resources in Shirenzhai mining area, Qichun County, Hubei Province in 2014, and on the basis of a brief analysis of regional geology and metallogenic background, the geological and fluid inclusions of Shirenzhai gold deposit are analyzed in this paper. The main ore-controlling factors and ore-controlling characteristics are determined, the ore-forming fluid properties are analyzed, the source of ore-forming material and the genesis of the deposit are discussed, and the metallogenic model is preliminarily established. Combined with the geological and geochemical exploration results in the study area, the enrichment law of gold in the region is summarized, and the favorable ore prospecting zone is determined. The main points are as follows: 1. The geological characteristics of two important shear zones (Liuhe shear zone and Lianhua shear zone) in the study area are confirmed. It is found that most of the rock masses, veins, quartz veins and gold-bearing quartz veins are distributed according to the shear zone, The shear zone is the main controlling factor of rock mass and gold deposit in this area. Through the study of the distribution, scale and deformation characteristics of shear zone in Shirenzhai area, it is considered that the main shear zone in the study area is brittle and ductile deformation. According to the geometries and kinematics characteristics of each deformed fabric, such as intersecting, interweaving, composite superposition, and combining with regional tectonics, the tectonic evolution stages of the shear zone are divided into three stages. The mechanism of ore-controlling is discussed, and it is considered that in the brittleness stage of the shear zone, The gold in the region was preliminarily enriched. The metallogenic stages of Shirenzhai gold deposit are studied. The metallogenic stages are divided into pyrite-quartz stage, quartz-polymetallic sulfide stage and carbonate-barite stage. The second stage is the main stage of Au formation. By analyzing the fluid inclusions of gold bearing quartz veins, it is concluded that the ore-forming materials are derived from fluid extraction of surrounding rock and deep materials. The ore-forming fluid belongs to the CO2-H2O 卤N2 卤H2 卤CH4 system, which is characterized by multi-genetic mixing of metamorphic water and post-magmatic hydrothermal fluid. Comparing with the tectonic setting, geological characteristics and ore-forming fluid properties of typical gold deposits in the region, it is shown that the origin of Shirenzhai gold deposit belongs to medium-shallow hydrothermal quartz vein type gold deposit, similar to extensional orogenic type gold deposit .5. Based on the study of geological characteristics and ore-controlling factors of Shirenzhai gold deposit, combined with geological and geochemical data in the area, it is considered that the Majiawan area has a certain metallogenic potential.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.51
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