Sulfidation State of Fluids in Active and Extinct Hydrothermal Systems: Transitions from Porphyry to Epithermal Environments-猫眼课题宝

DOI：

10.5382/sp.10.15

发表时间：

2003

期刊：

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中科院分区：

其他

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作者：

M. Einaudi;J. W. Hedenquist

与氧化态并列的“硫化状态”概念在矿床研究中的使用始于蒙大拿州巴特的雷诺·赛尔斯和查尔斯·迈耶的研究。通过实验测定硫化物矿物的稳定性，确定了成矿环境中的对比。最近对活跃的火山和地热系统中的蒸汽成分的研究允许直接与岩石学研究得出的地球化学环境进行比较。本文汇编了来自弧形环境的新鲜火成岩的氧化和硫化状态，以及钙碱性斑岩铜矿、与斑岩有关的贱金属脉和浅成热液金银矿床中硫化物组合的硫化状态。将这些数据与活动体系流体的组成进行了对比，绘制了logfS2-1000/T、RH-1000/T、RS-1000/T图上的蒸汽组成，其中RH≈LOG(X H2/X H2O)、RS≈LOG(X H2/X H 2S)和X=气体的摩尔分数。安山质弧状岩浆的氧化态分布在铁闪石+磁铁矿+石英和磁黄铁矿+黄铁矿+磁铁矿之间的紧密簇状中。当在固相线以下平衡时，弧状钚偏离较高的氧化态。弧岩浆的硫化状态很低到

Use of the concept of "sulfidation state", in parallel with oxidation state, in the study of ore deposits finds its beginnings with the studies of Reno Sales and Charles Meyer at Butte, Montana. Experimental determination of the stability of sulfide minerals in terms of f S2 and temperature followed, leading to definition of contrasts in ore-forming environments. More recent studies of vapor compositions in active volcanic and geothermal systems allow direct comparisons with geochemical environments deduced from petrologic study. In this paper, we present a compilation of oxidation and sulfidation states of fresh igneous rocks from arc environments and on sulfidation states of sulfide assemblages in calc-alkalic porphyry copper, porphyry-related base-metal veins, and epithermal gold-silver deposits. These data are contrasted with compositions of fluids from active systems by plotting vapor compositions on log f S2 – 1000/T, RH – 1000/T, RS – 1000/T diagrams, where RH ≈ log (X H2 / X H2O), RS ≈ log ( X H2 / X H2S ) and X = mole fraction of the gas. Oxidation states of andesitic arc magmas plot in a tight cluster between fayalite + magnetite + quartz and pyrrhotite + pyrite + magnetite. On equilibrating below the solidus, arc plutons deviate toward higher oxidation states. Sulfidation states of arc magmas are very low to

Sulfidation State of Fluids in Active and Extinct Hydrothermal Systems: Transitions from Porphyry to Epithermal Environments

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