云南老寨湾金矿床成矿流体的特征  

Characteristics of Ore-forming Fluid of Gold Deposit in Laozhaiwan,Yunnan Province

作　　者：姚娟[1] 罗梅[1] 任光明[2] 王玉婷[1] 

机构地区：[1]成都理工大学核技术与自动化工程学院,四川成都610059 [2]成都理工大学地球科学学院,四川成都610059

出　　处：《资源环境与工程》2008年第2期163-167,共5页Resources Environment & Engineering

摘　　要：云南老寨湾金矿床是滇黔桂三角成矿区中一个低品位大储量微细粒金矿床,赋矿地层为加里东古隆起面上泥盆系下统细碎屑岩。通过对老寨湾金矿床热液成矿流体包裹体成分、流体密度、成矿压力、成矿深度和硫(S)、氢(H)、氧(O)同位素诸方面初步研究表明,成矿流体属中低温(110～253℃)、低盐度(23.86～11.2Wt%NaCl)、低密度(0.97～1.08g/cm3)的流体,属于(SO42-)Cl--(K+)Na+水化学类型,成矿环境为浅成(0.21～1.14km)环境。成矿流体主要来自地幔分异流体与大气降水、地表水交换的产物。老寨湾金矿床属浅成中低温低盐度热液型矿床。The Laozhaiwan gold deposit of Yunnan,located in triangular metallogenic region of Yunnan, Guizhou, Guangxi Provinces,is fine-grained gold deposit in low grade but great reserves, ore-bearing stratum is fine-grained clastic rock of lower series of Upper Devonian in Caledonian paleo-uplift zone. Through the primarily study on compositions, densities, pressures, depth and sulfur, hydrogen and oxygen isotopes of hydrothermal ore-forming fluid inclusions of gold deposit in Laozhaiwan,the authors conclude that ore-forming fluid is in low-medium temperature （110 - 253 ℃）, low salinity （23.86 - 11.2 Wt% NaCl） and low density （0.97 - 1.08 g/cm^3 ） which belongs to （ SO4^2- ） Cl^ - - （ K^ ＋ ） Na ^＋ hydrochemical type in a shallow （0.21 - 1.14 km） environment. The ore-forming fluid mostly derived from products by exchange of mantle differentiation fluids and meteoric water,surface water. Laozhaiwan gold deposit is a hydrothermal deposit in low- medium temperature and low salinity.

关 键 词：微细粒型金矿床 成矿流体 矿床地球化学 老寨湾 

分 类 号：P618.51[天文地球—矿床学]