作为弧中富集硫同位素特征来源的板岩流体中的氧化硫物种

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geochemistry Geophysics Geosystems Pub Date : 2024-06-29 DOI:10.1029/2024GC011542
Patrick Beaudry, Dimitri A. Sverjensky
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引用次数: 0

摘要

从俯冲板块到地幔楔的氧化硫循环同时解释了俯冲带的氧富集度(fO2)升高、热液和岩浆硫的高输出以及这些输出的富集硫同位素特征(即δ34S > 0‰)。然而,对于板坯流体中与高压实验相一致的硫的丰度和种类还缺乏定量的了解。在这里,我们分析了已发表的无水石膏在 H2O-NaCl 溶液中溶解度的实验数据,在深层地球水模型的框架内校准了硫的高压水溶液标示模型。我们描述了水络合物的特征,这是解释高实验无水石膏溶解度所必需的。然后,我们利用这一框架预测了在 2 至 3 GPa、400 至 800°C 和对数 fO2 从 FMQ-2 到 FMQ+4 的条件下,与岩浆岩和超岩浆岩平衡的化学复合流体中硫的标示和溶解度。我们的研究表明,在 FMQ+1 至 +2 的 fO2 条件下,钙和钠的硫酸盐络合物明显增强了与黄铁矿平衡的中度氧化流体中硫酸盐的稳定性,导致流体中相对于板坯的硫同位素分馏率高达 10‰。这种流体可将氧化、富硫和高δ34S特征传递给地幔楔,并最终转移到弧状岩浆中,而无需引用富含34S的俯冲岩性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Oxidized Sulfur Species in Slab Fluids as a Source of Enriched Sulfur Isotope Signatures in Arcs

Recycling of oxidized sulfur from subducting slabs to the mantle wedge provides simultaneous explanations for the elevated oxygen fugacity (fO2) in subduction zones, their high hydrothermal and magmatic sulfur outputs, and the enriched sulfur isotopic signatures (i.e., δ34S > 0‰) of these outputs. However, a quantitative understanding of the abundance and speciation of sulfur in slab fluids consistent with high pressure experiments is lacking. Here we analyze published experimental data for anhydrite solubility in H2O-NaCl solutions to calibrate a high-pressure aqueous speciation model of sulfur within the framework of the deep earth water model. We characterize aqueous complexes, required to account for the high experimental anhydrite solubilities. We then use this framework to predict the speciation and solubility of sulfur in chemically complex fluids in equilibrium with model subducting mafic and ultramafic lithologies, from 2 to 3 GPa and 400 to 800°C at log fO2 from FMQ-2 to FMQ+4. We show that sulfate complexes of calcium and sodium markedly enhance the stability of sulfate in moderately oxidized fluids in equilibrium with pyrite at fO2 conditions of FMQ+1 to +2, causing large sulfur isotope fractionations up to 10‰ in the fluid relative to the slab. Such fluids could impart oxidized, sulfur-rich and high δ34S signatures to the mantle wedge that are ultimately transferred to arc magmas, without the need to invoke 34S-rich subducted lithologies.

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来源期刊
Geochemistry Geophysics Geosystems
Geochemistry Geophysics Geosystems 地学-地球化学与地球物理
CiteScore
5.90
自引率
11.40%
发文量
252
审稿时长
1 months
期刊介绍: Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.
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