摘要
豫西南的石板沟金矿床是一个与剪切带有关的脉状金矿。该矿床流体包裹体的系统分析结果表明 :镜下石英中流体包裹体类型丰富多样。据室温状态下流体包裹体的相态、加热状态下流体包裹体的性状及产出特征 ,鉴别出原生富气包裹体、原生富液包裹体、原生含子矿物多相包裹体、次生富液包裹体和次生纯液包裹体等五种类型。流体包裹体显微测温数据的统计结果显示均一温度 (Th)在 3 80～ 110℃之间 ,成矿流体最低捕获压力估计在 13～ 74MPa之间 ;盐度估计在 2 .3 %～ 43 .0 %NaCl之间 ;密度估计在 0 .84～ 1.15 g/cm3之间。流体组份属K+ -Na+ -Ca2 + -Mg2 + -HCO3- -Cl--SO4 2 - 体系。流体包裹体氢、氧和碳等稳定同位素测试结果显示δ1 8OH2 O为 -2 .49‰～ -1.99‰ ,δD H2 O为 -2 4.0‰～-3 3‰ ,δ1 3CCO2 为 -11.12‰～ -14 .5 9‰。综合研究认为该矿床不同矿化类型的成矿流体性质不同 ,具有多来源特征 ,成矿与剪切带和中低温热液作用有关 ,可能是岩浆作用与动力变形变质作用紧密配合的结果。
The Shibangou lode-type gold deposit, south-west Henan province, China, is hosted ductile-brittle shear zones. Fluid Inclusions characteristics, and natures of ore-forming fluids are deduced by samples in this area. Microthermometry of fluid inclusions in quartz indicates five types of inclusions: (1)two phase gas-rich inclusions(type Ⅰ), (2) two phase liquid-rich inclusions (type Ⅱ), (3)polyphase inclusions that contain daughter crystals (type Ⅲ), (4) secondary two phase liquid-rich inclusions (typeⅣ). (5)secondary one phase liquid inclusions (type V).Fluid inclusions have homogenization temperatures range from 110℃ to 380℃, Pt range from 13 to 74 MPa, salinity range from 2.3% to 43.0% NaCl equiv, and Density range from 0.80 to 1.15 g/cm^3. Ore\|forming fluids are basically be long to the K^+-Na^+-Ca^(2+)-Mg^(2+)-HCO_3^--Cl^--SO_4^(2-) system. δD_(H_2O) values of inclusion are in a range from -24.0‰ to -37.3‰, and δO_(H_2O) in a range from -2.49‰ to (-1\^99‰), and δ^(13)Cco_2 values of CO_2 gas in inclusions are in a range from -11.12‰ to -14\^59‰. In this paper, based on the studies of fluid inclusions trapped in quartzes, the ore-forming fluid characteristics are described, the depositional mechanisms of Au from ore-forming fluid are discussed, and the ore genesis of this deposit is revealed.
出处
《东华理工学院学报》
2004年第1期44-51,共8页
Journal of East China Institute of Technology
基金
国土资源部定向科研基金直科定 94- 2 6项
国家自然科学基金资助 (497731 96)
