液态不混溶作用:成矿机制之一 ——以太行山地区的金矿为例

Fluid Immiscibility as a Mechanism of Ore forming Process: the Gold Deposits in the Taihan Mountains as an Example

太行山地区的许多金矿产在花岗质岩体内部及其附近的围岩中，产出形式以金属硫化物石英脉为主（如蔡术庵金矿、土石金矿、九集庄金矿等），部分金矿以爆破角砾岩体的形式出现（如窑沟金矿），另一部分则以含矿金属硫化物浸染在花岗岩破碎带中的形式产出（如上明峪金矿）...

There are plentiful fluid inclusions in quartz from gold bearing quartz sulfide veins in the gold deposits in the Taihan mountains. The quartz contains co existing high density and low density fluid inclusions. Some high density fluid inclusions are H 2O rich, and some low density inclusions are CO 2 rich fluid. The co existence of low density and high density fluid inclusions with a similar homogeneous temperature clearly suggests that these two types of fluid inclusions were formed simultaneously. This implies that either these two fluids are the product of mixing at or above their corresponding homogeneous temperatures or these were formed by unmixing of the originally homogeneous high temperature fluid. Because the inclusions of all types from the gold deposits are variable not only in the degree of filling (from 0.3 to 0.9),and salinity (from 0.4 to 41.3 wt percent NaCl equiv), but also in chemical compositions, the inclusions represent different fluids trapped during ore formation. The characteristics of fluid inclusions from the gold deposits in the Taihan mountains present evidence for an unmixing process.