A thermodynamic model of the gold–polymetallic volcanogenic massive sulfide ore-forming system, related to the evolution of a shallow acid volcanic chamber of an island arc (Galkinskoe deposit, Northern Urals) was created. The low W/R ratio (<0.25) obtained via modeling indicates slow filtration of fluid upsection in the sequence. In general, the Cu, Zn, Pb, Ag, and Au concentrations in the fluid decrease monotonically with decreasing temperature within the considered temperature range of 600–200°C due to precipitation of solid phases. With a temperature decrease from 550 to 450°C or less, chalcopyrite (±pyrrhotite), sphalerite, and minor galena crystallize successively. The Zn concentration in fluid with decreasing temperature first increases due to incorporation of zinc from host rocks, and at a temperature of <520°C, increases due to the formation of sphalerite in the system.

中文翻译：

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乌拉尔北部金矿和火山大块硫化物矿床矿石形成的物理化学模拟

建立了金-多金属火山成因块状硫化物成矿系统的热力学模型，与岛弧（Galkinskoe 矿床，北乌拉尔）的浅酸性火山室的演化有关。通过建模获得的低 W/R 比 (<0.25) 表明序列中流体上部的过滤缓慢。一般来说，由于固相沉淀，流体中的 Cu、Zn、Pb、Ag 和 Au 浓度在 600-200°C 的考虑温度范围内随着温度的降低而单调降低。随着温度从 550°C 降低到 450°C 或更低，黄铜矿（±磁黄铁矿）、闪锌矿和小方铅矿依次结晶。由于主岩中锌的掺入，流体中的锌浓度随着温度的降低首先增加，并且在 <520°C 的温度下，