弧岩浆流体中的硫种和金迁移

IF 15.7 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Stefan Farsang, Zoltán Zajacz
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引用次数: 0

摘要

岩浆流体中存在的硫种类影响着全球氧化还原循环、地球气候和一些最大、最具经济价值的关键金属矿床的形成。然而,在与上地壳岩浆储层相关的条件下,硫的形态尚不清楚。在这里,我们将原型压力容器装置和拉曼光谱结合起来,在一系列地质相关的压力-温度-氧化还原条件下,原位确定弧岩浆流体类似物中的硫形态。与以往的实验结果相比,我们发现实验流体中的主要硫种是HS−、H2S和SO2,而S6+和S2−和S3−硫自由基离子的浓度可以忽略不计。当硫主要以HS -和H2S形式存在时,实验流体中测量到的金溶解度最高,大大超出热力学预测。我们的结果表明,HS−而不是硫自由基是岩浆热液中金的高溶解度的原因。我们还发现岩浆硫脱气是一个氧化条件下的氧化还原过程,并可能导致超出板源通量和结晶所赋予的额外岩浆氧化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Sulfur species and gold transport in arc magmatic fluids

Sulfur species and gold transport in arc magmatic fluids

Sulfur species and gold transport in arc magmatic fluids
The sulfur species present in magmatic fluids affect the global redox cycle, the Earth’s climate and the formation of some of the largest and most economic ore deposits of critical metals. However, the speciation of sulfur under conditions that are relevant for upper crustal magma reservoirs is unclear. Here we combine a prototype pressure vessel apparatus and Raman spectroscopy to determine sulfur speciation in arc magmatic fluid analogues in situ over a range of geologically relevant pressure–temperature–redox conditions. We find that HS−, H2S and SO2 are the main sulfur species in the experimental fluids, while the concentrations of S6+ species and S2− and S3− sulfur radical ions are negligible, in contrast to previous experimental work. The measured gold solubilities in the experimental fluids are highest when sulfur is dominantly present as HS− and H2S species and greatly exceed thermodynamic predictions. Our results imply that HS−, rather than sulfur radicals, accounts for the high solubilities of gold in magmatic–hydrothermal fluids. We also find that magmatic sulfur degassing is a redox process under oxidizing conditions and may lead to additional magma oxidation beyond that imparted by slab-derived fluxes and crystallization. There are three dominant sulfur species present in arc magmatic fluids: HS−, H2S and SO2. HS− controls the mobilization and transport of gold in arc magmatic–hydrothermal systems, according to in situ experiments on arc magmatic fluid analogues.
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来源期刊
Nature Geoscience
Nature Geoscience 地学-地球科学综合
CiteScore
26.70
自引率
1.60%
发文量
187
审稿时长
3.3 months
期刊介绍: Nature Geoscience is a monthly interdisciplinary journal that gathers top-tier research spanning Earth Sciences and related fields. The journal covers all geoscience disciplines, including fieldwork, modeling, and theoretical studies. Topics include atmospheric science, biogeochemistry, climate science, geobiology, geochemistry, geoinformatics, remote sensing, geology, geomagnetism, paleomagnetism, geomorphology, geophysics, glaciology, hydrology, limnology, mineralogy, oceanography, paleontology, paleoclimatology, paleoceanography, petrology, planetary science, seismology, space physics, tectonics, and volcanology. Nature Geoscience upholds its commitment to publishing significant, high-quality Earth Sciences research through fair, rapid, and rigorous peer review, overseen by a team of full-time professional editors.
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