汉阴北部吴家湾地区金矿床控矿因素与矿床成因研究
发布时间：2018-09-05 14:59
【摘要】：汉阴北部山区地处南秦岭印支褶皱造山带南部,出露一套下志留统梅子垭组浅变质含炭泥质碎屑岩,已发现的金矿带自石泉县羊坪湾-汉阴县黄龙-汉滨区流芳,东西长约100km、南北宽约10~20km,为一大型的金矿化集中区。论文通过对汉阴北部地区吴家湾金矿床地质特征研究,以石英脉流体包裹体为研究对象,开展均一法测温、激光拉曼探针原位成分分析,探讨吴家湾金矿床成矿流体的性质;通过汉阴北部吴家湾地区控矿因素研究,总结了该地区的控矿构造模型和找矿标志,提出吴家湾金矿床的矿床成因。主要取得以下进展和成果:(1)通过对汉阴北部吴家湾地区梅子垭组地层中岩石变质矿物(黑云母-石榴石地质温度计)及岩石主要矿物组合(黑云母+石英+白云母+绿泥石±石榴石)的研究,提出该区岩石变质程度主要为低绿片岩相,局部可达高绿片岩相。(2)吴家湾金矿区的矿体分布于绢云石英片岩与硅质岩带的岩性分界面附近,受脆韧性断裂构造控制明显;主要的找矿标志为黄铁矿化、硅化等。(3)吴家湾金矿床成矿流体的均一温度主要在230~280℃,成矿流体的盐度集中在2~10wt%(NaCleq),表现为中低温、低盐度特征;计算得到成矿密度为0.62~0.93g/cm3,成矿压力为38.04~95.38MPa,矿化深度在1.38~3.47km,属中-浅层次成矿深度范围。流体包裹体以CO2-H2O体系为主,成矿流体具有低盐度、富CO2特征。(4)通过对吴家湾金矿床区域大地构造背景、矿床成矿特征以及流体包裹体地球化学的研究,认为该矿床类似于造山型金矿床。
[Abstract]:The northern mountainous area of Hanyin is located in the south of the Indosinian fold orogenic belt in the South Qinling Mountains. A set of shallow-metamorphosed carbonaceous muddy clastic rocks of the MeiZiya formation of Lower Silurian have been exposed. The gold belt has been discovered from Liufang, Yangping Bay, Shiquan County, Huanglong and Hanbin areas, Hanyin County, China. The east-west is about 100 km, and the north and south is about 10 ~ 20 km, which is a large gold mineralization concentration area. Based on the study of the geological characteristics of the Wujiawan gold deposit in the northern part of Hanyin, taking the fluid inclusions of quartz vein as the research object, homogenizing temperature measurement and in-situ composition analysis with laser Raman probe are carried out to study the ore-forming fluid properties of the Wujiawan gold deposit. Based on the study of ore-controlling factors in Wujiawan area in northern Hanyin, this paper summarizes the ore-controlling structure model and prospecting criteria in this area, and puts forward the genesis of the Wujiawan gold deposit. The main achievements are as follows: (1) the rock metamorphic minerals (biotite-garnet geological thermometer) and the main rock mineral assemblages (biotite quartz dolomite) in the Meiziya formation of Wujiawan area in northern Hanyin are studied. Mother chlorite + garnet), It is suggested that the metamorphic degree of the rocks in this area is mainly low greenschist facies, and the high greenschist facies can be obtained locally. (2) the orebodies of the Wujiawan gold deposit area are distributed near the lithologic interface between the sericite quartz schist and the siliceous rock belt, and are obviously controlled by brittle ductile fracture structure. The main prospecting criteria are pyrite and silicification. (3) the homogenization temperature of the ore-forming fluid of the Wujiawan gold deposit is mainly at 230 ~ 280 鈩，
本文编号：2224631
[Abstract]:The northern mountainous area of Hanyin is located in the south of the Indosinian fold orogenic belt in the South Qinling Mountains. A set of shallow-metamorphosed carbonaceous muddy clastic rocks of the MeiZiya formation of Lower Silurian have been exposed. The gold belt has been discovered from Liufang, Yangping Bay, Shiquan County, Huanglong and Hanbin areas, Hanyin County, China. The east-west is about 100 km, and the north and south is about 10 ~ 20 km, which is a large gold mineralization concentration area. Based on the study of the geological characteristics of the Wujiawan gold deposit in the northern part of Hanyin, taking the fluid inclusions of quartz vein as the research object, homogenizing temperature measurement and in-situ composition analysis with laser Raman probe are carried out to study the ore-forming fluid properties of the Wujiawan gold deposit. Based on the study of ore-controlling factors in Wujiawan area in northern Hanyin, this paper summarizes the ore-controlling structure model and prospecting criteria in this area, and puts forward the genesis of the Wujiawan gold deposit. The main achievements are as follows: (1) the rock metamorphic minerals (biotite-garnet geological thermometer) and the main rock mineral assemblages (biotite quartz dolomite) in the Meiziya formation of Wujiawan area in northern Hanyin are studied. Mother chlorite + garnet), It is suggested that the metamorphic degree of the rocks in this area is mainly low greenschist facies, and the high greenschist facies can be obtained locally. (2) the orebodies of the Wujiawan gold deposit area are distributed near the lithologic interface between the sericite quartz schist and the siliceous rock belt, and are obviously controlled by brittle ductile fracture structure. The main prospecting criteria are pyrite and silicification. (3) the homogenization temperature of the ore-forming fluid of the Wujiawan gold deposit is mainly at 230 ~ 280 鈩，
本文编号：2224631
本文链接：https://www.wllwen.com/kejilunwen/diqiudizhi/2224631.html
