河南洛宁龙门店银矿成矿阶段划分及流体包裹体测温意义
Metallogenic Stages and the Homogenization Temperature of Fluid Inclusions of the Longmendian Silver Deposit in Luoning City, Henan Province
庞绪成 1赵少攀 1杨剧文 2赵定生 3范少军 4郭跃闪 1张凯涛1
作者信息
- 1. 河南理工大学,河南焦作454003
- 2. 洛阳有色集团有限公司,河南洛阳 471000
- 3. 洛阳锦桥矿业有限公司,河南洛宁 471700
- 4. 河南省有色金属地质矿产局第六地质队,河南郑州 450016
- 折叠
摘要
河南龙门店银矿位于熊耳山西段的变质核杂岩区和金银成矿聚集区,成矿地质条件好.工业矿体受NE-NNE向断裂控制,含矿断裂带两侧具有硅化→绢英岩化(铬云母化)→钾化对称蚀变分带现象.赋矿围岩主要为新太古界太华群变质岩.矿石类型包括石英脉型和蚀变岩型.原生包裹体约占85％,次生包裹体约占15％.原生包裹体中,纯液相包裹体约占总数的70％,以直径2～6μm居多;气液两相包裹体约占28％,多为4～ 10μm,最大可达15μm,气相比大多介于2％～22％之间;含子矿物的三相流体包裹体约占总数的2％,直径多在5～10μm之间,气液比2％ ～ 10％.矿床可划分为石英-黄铁矿阶段(Ⅰ)、石英-含金硫化物阶段(Ⅱ)、石英-银铅多金属硫化物阶段(Ⅲ)和碳酸盐化阶段(Ⅳ)四个成矿阶段,各阶段对应的均一成矿温度分别为252～385℃、145 ～ 343℃、104 ～ 201℃和81 ～ 125℃,对应的平均盐度(wt％ NaCl.eqv)依次为5.38、17.17、31.35和14.48,属中高盐度低温热液型银铅矿.银主要形成于温度较低的第Ⅲ成矿阶段.结合区域情况在矿床深部有找到中高温热液型铜金矿床的可能.
Abstract
The Longmendian silver deposit with good geological conditions of mineralization is located in the western part of the metamorphic core complex zone in the Xiong' ershan, which is a gold and silver mineralization belt.In this area, industrial ore veins are mainly controlled by NE-NNE trending faults.On either side of the ore-bearing faults, there is an alteration zoning phenomenon from silicification → beresitization (chrome mica)→ potassium.The host rock is mainly metamorphic rocks of Archean Taihua Group.The ore types include quartz vein and altered rock types.The primary inclusions account for about 85％, and secondary inclusions for about 15％ of the total.In the primary inclusions, the pure liquid phase is about 70％ of the total, with a diameter of 2 ～ 6μm;Gas liquid two-phase inclusions are about 28％, most of which are between 4～ 10μm in diameter with the maximum up to 15μm.Gas phase ratios are mostly between 2％ ～22％.Three-phase fluid inclusions with sub-bearing minerals account for about 2％ of the total with diameters more than 5 ～ 10 m, and the gas to liquid ratios are 2％ ～ 10％.Mineralization can be divided into four stages according to the mineral interspersed combination: Quartz-pyrite stage (Ⅰ), quartz-golt sulfide stage (Ⅱ), quartz-Ag Pb polymetallic sulfide stage (Ⅲ) and carbonate development stage (Ⅳ).Their ore-forming temperatures are 252 ～ 385℃;145～ 343℃;104～201℃ and 81 ～ 125℃ , respectively.The average salinity values (wt％ NaCl.eqv) are 5.38, 17.17, 31.35 and 14.48, respectively.The type of ore deposit is of the middle-high salinity and low temperature hydrothermal Ag-Pb deposit.Silver is mainly formed in the Ⅲ mineralization stage with lower temperatures.Combined with the situation in the region, it is possible to find middle-high temperature hydrothermal copper-gold deposits at depth in this area.
关键词
成矿阶段/包裹体/测温/龙门店银矿/洛宁/河南Key words
metallogenic stage/fluid inclusion/temperature measurement/Longmendian silver mine/Luoning/Henan引用本文复制引用
基金项目
中国地质调查局项目(12120114035401)
洛阳有色集团科研基金(20134108110344)
出版年
2015
国家科技期刊平台
NSTL
维普
万方数据