Abstract

The evolution of the hydrothermal system forming the Bazov gold-ore deposit is traced by the data on the composition and properties of the fluid inclusions within the veined quartz. The gold-bearing quartz veins were formed under a moderate decrease of temperature from 290 to 230°C and considerable decrease of pressure from 0.75 to 0.25 kbar. The pressure drop was accompanied by the volume crystallization of quartz from SiO₂-saturated hydrothermal springs with the appearance of a residual fluid phase. In addition, the fluid composition was transformed from hydrocarbonate into hydrocarbonate–methane with the increase in the concentrations of chlorides of alkali and alkaline-earth metals (from 1 to 8 wt % of NaCl-equiv) along with the ore-forming elements (As, Sb, Fe, Zn, etc.). The pressure under which the formation of the gold–quartz veins occurred (about 0.25 kbar) limited the formation depth of the deposit to the range from 1 to 2.5 km (for the lithostatic and hydrostatic gradient, respectively).

中文翻译：

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巴佐夫金矿床（俄罗斯东雅库特）石英形成的理化条件

摘要

形成巴佐夫金矿床的热液系统的演化可以通过脉状石英内流体包裹体的成分和性质数据来追踪。含金石英脉是在温度从290到230°C适度降低，压力从0.75 kbar到0.25 kbar显着降低的条件下形成的。压降伴随着石英从SiO ₂的大量结晶-饱和的水热弹簧，带有残留的流体相。另外，随着成矿元素（As的增加），碱金属和碱土金属的氯化物浓度（NaCl当量的1至8 wt％）的增加，流体成分也从碳氢化合物转变为碳氢化合物-甲烷。 ，Sb，Fe，Zn等）。金-石英脉形成的压力（约0.25 kbar）将矿床的形成深度限制在1至2.5 km（分别为岩石静压和静水压力梯度）范围内。