内蒙古拜仁达坝银多金属矿床二氧化碳不混溶成矿作用研究
发布时间：2019-01-10 12:33
【摘要】：通常流体的沸腾、混合及与围岩的反应被认为是成矿元素沉淀的3种有效途径。报道了一种较少见的由二氧化碳引起的成矿元素沉淀方式,即二氧化碳不混溶成矿作用。拜仁达坝是一超大型岩浆热液型银多金属矿床,银储量1442t。对该矿床中与多金属硫化物共(伴)生方解石典型样品进行了碳、氧同位素、流体包裹体均一温度-盐度和稀土元素的系统测试分析。结果显示,方解石发育富气相和富液相两类包裹体,其富气相包裹体均一温度集中在360~380℃,富液相包裹体为280~340℃,它们盐度集中在6%~9%NaCleqv;方解石具正Eu异常(Eu/Eu*=2.64~5.88)且富集轻稀土元素[(La/Yb)N=4.74~63.91],表明其为热液成因;方解石碳和氧同位素平均值分别为-13.2‰和12.85‰,依此进行二氧化碳不混溶建模,其结果与实测情况吻合。研究结果表明,在拜仁达坝矿床的成矿元素沉淀过程中,二氧化碳的不混溶起着一定成矿作用。
[Abstract]:Generally, boiling, mixing and reaction with surrounding rock are considered to be three effective ways to precipitate ore-forming elements. In this paper, a rare way of precipitating metallogenic elements caused by carbon dioxide, i.e. carbon dioxide immiscible mineralization, is reported. Bayern Daba is a very large magmatic hydrothermal silver polymetallic deposit with silver reserves of 1442 t. The typical samples of calcite coexisting with polymetallic sulphides in the deposit were systematically tested and analyzed for carbon oxygen isotopes fluid inclusions homogenization temperature salinity and rare earth elements. The results show that both gas-rich and liquid-rich inclusions are developed in calcite. The homogenization temperature of gas-rich inclusions is 360- 380 鈩，
本文编号：2406312
[Abstract]:Generally, boiling, mixing and reaction with surrounding rock are considered to be three effective ways to precipitate ore-forming elements. In this paper, a rare way of precipitating metallogenic elements caused by carbon dioxide, i.e. carbon dioxide immiscible mineralization, is reported. Bayern Daba is a very large magmatic hydrothermal silver polymetallic deposit with silver reserves of 1442 t. The typical samples of calcite coexisting with polymetallic sulphides in the deposit were systematically tested and analyzed for carbon oxygen isotopes fluid inclusions homogenization temperature salinity and rare earth elements. The results show that both gas-rich and liquid-rich inclusions are developed in calcite. The homogenization temperature of gas-rich inclusions is 360- 380 鈩，
本文编号：2406312
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