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.
出处
《资源环境与工程》
2008年第2期163-167,共5页
Resources Environment & Engineering
关键词
微细粒型金矿床
成矿流体
矿床地球化学
老寨湾
fine-grained gold deposit
ore-forming fluid
deposit geochemistry
Laozhaiwan in Yunnan
