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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Magmatic sulfide immiscibility at an active magmatic-hydrothermal system: The case of La Fossa (Vulcano, Italy)
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Magmatic sulfide immiscibility at an active magmatic-hydrothermal system: The case of La Fossa (Vulcano, Italy)

机译：活跃的岩浆热液系统中的岩浆硫化物不混溶性：La Fossa案（意大利，武尔卡诺）

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摘要

Magmatic sulfide minerals preserved in fresh volcanic rocks can be used to trace sulfur and chalcophile element evolution in magmatic systems and to constrain the potential magmatic contribution to ore-forming fluids. In this work, we present a petrographic and microanalytical study of magmatic sulfides in the products of La Fossa (Vulcano, southern Italy), an active arc-related volcano currently with a shallow acidic hydrothermal system, and discuss the results with petrological data obtained from melt inclusions. While the sulfur-rich basalts feeding the plumbing system were oxidized and sulfide-undersaturated, as common in arc-basalts, a major event of sulfide melt separation from the silicate melt occurred at the trachytic stage, in the shallow reservoir (minimum depth based on H2O content of melt inclusions is 1200-2200 m), promoted by the lowering of fO(2). Sulfide immiscibility was unrelated to magnetite fractionation and was encountered after a notable sulfur loss at the transition from mafic to intermediate magma composition. The late sulfide saturation implies that the silicate melt became enriched in Cu with differentiation. This is indicated by the relatively high Cu concentration in the analyzed sulfide blebs, comparable to the composition of sulfides found in other active arc volcanoes as well as in magmatic systems associated with porphyry copper mineralization. The newly reported occurrence of sulfide immiscibility in the La Fossa shallow reservoir has implications for the evolution of sulfur in the plumbing system and for the contribution of magmatic sulfur and metals to surface fumaroles, as well as to the deep hydro thermal fluids during non-eruptive periods. The results indicate that La Fossa volcano is a possible active analogue of mineralizing magmatic-hydrothermal systems. (C) 2018 Elsevier B.V. All rights reserved.
机译：保存在新鲜火山岩中的岩浆硫化物矿物可用于追踪岩浆系统中的硫和硫族元素元素演化，并限制岩浆对成矿流体的潜在贡献。在这项工作中，我们提供了La Fossa（意大利南部的Vulcano）产品中岩浆硫化物的岩相学和微观分析研究，La Fossa是目前存在浅酸性热液系统的活性弧相关火山，并与从熔化夹杂物。与弧形玄武岩一样，向水暖系统供入的富硫玄武岩被氧化和硫化物欠饱和，而硫化物从硅酸盐熔体中分离出来的主要事件发生在浅层储层的疏松阶段（最小深度为fO（2）的降低促进了熔融夹杂物的H2O含量为1200-2200 m）。硫化物的不溶混性与磁铁矿的分馏无关，并且在从铁镁质向中等岩浆成分转变过程中出现明显的硫流失之后，会遇到这种情况。硫化物的后期饱和表明硅酸盐熔体中的铜富集并分化。这可以通过分析的硫化物气泡中相对较高的Cu浓度来表明，这与其他活性弧火山以及斑岩铜矿化相关的岩浆系统中发现的硫化物成分相当。最近报道的La Fossa浅层储层中硫化物不混溶的发生，对管道系统中硫的演化以及岩浆硫和金属对地表富马mar以及非火山喷发过程中深部水热流体的贡献都具有重要意义。期。结果表明，La Fossa火山是矿化岩浆热液系统的一种可能的活性类似物。 （C）2018 Elsevier B.V.保留所有权利。

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