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首页> 外文期刊>Geochemistry: Exploration, Environment, Analysis >Stable isotope (C, O, S) systematics in alteration haloes associatedwith orogenic gold mineralization in the Victorian gold province,SE Australia
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Stable isotope (C, O, S) systematics in alteration haloes associatedwith orogenic gold mineralization in the Victorian gold province,SE Australia

机译：澳大利亚维多利亚州维多利亚金矿区与造山型金矿化有关的晕圈变化中的稳定同位素（C，O，S）系统

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摘要

This study investigates whether hydrothermal alteration of metasedimentary rocks associated with orogenic gold mineralization in the Victorian gold province produces systematic changes in oxygen, carbon and sulphur isotope compositions that might provide explorationists with vectors towards ore. The presence of systematic isotopic trends across wallrock alteration haloes in gold deposits in the Stawell, Percydale, Ballarat, Bendigo and Fosterville goldfields clearly supports the interpreted hydrothermal origin of these haloes. General increases in carbonate 13C towards the ore zones in all deposits record the influx of hydrothermal CO2. Whole-rock silicate and quartz 18O, carbonate 18O, and sulphide 34S shifts equally mirror petrological and geochemical changes that resulted from prolonged and extensive interaction between externally derived hydrothermal fluids and the surrounding siliciclastic wallrocks. With the possible exception of sulphur, however, the isotopic enrichment/depletion trends are subtle and also vary significantly from deposit to deposit. Results of this study and comparisons with published data suggest that the oxygen and carbon isotopic ratios of silicates and carbonates in whole-rock samples within the alteration haloes are buffered by the wallrocks. Hydrothermal sulphides in Victorian orogenic gold deposits are characterized by 34S values generally in the range –5 to +5. However, there is relatively little influx of hydrothermal sulphur beyond c. 5 to 10 m from the vein margins and disseminated pyrite well removed from the lode systems is characterized by either greatly negative or positive 34S values typically greater than±10.
机译：这项研究调查了维多利亚州金矿省与沉积金成矿有关的准沉积岩的水热蚀变是否产生了氧，碳和硫同位素的系统变化。可能为勘探者 提供有关矿石的载体的组合物。 Stawell，Percydale，Ballarat，Bendigo和Fosterville金矿场中的系统性同位素 趋势跨越围岩蚀变晕在金矿床中明显支持了这些 光晕的热液起源。在所有矿床中，碳酸盐 13 向矿床 的总体增加记录了热液CO 2 的涌入。整个岩石 硅酸盐和石英 18 O，碳酸盐 18 O和硫化物 34 S位移 < / sup>相等地反映了 的岩石学和地球化学变化，该变化是由外部 衍生的热液与周围的硅质碎屑 围岩之间的长时间广泛相互作用所导致的。但是，除了硫的可能例外， 同位素富集/枯竭趋势是微妙的，并且 在沉积物之间也存在很大差异。这项研究的结果以及与已发表数据的比较表明，在整个岩石样品中，硅酸盐和碳酸盐中氧和碳的碳同位素比在变化范围内光晕被围岩缓冲。 维多利亚造山金矿床中的热硫化物的特征是 34 S值，通常在–5 范围内到+5。但是，超过c的热液 硫的流入相对较少。距静脉边缘5到10 m且从矿床系统中清除的散布的 黄铁矿的特征通常是 很大或非常小的 34 S值 大于±10。

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