Molecular H2 in silicate melts

IF 4.5 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Geochimica et Cosmochimica Acta Pub Date : 2024-10-26 DOI:10.1016/j.gca.2024.10.020

Dionysis I. Foustoukos

引用次数: 0

Abstract

A series of hydrothermal diamond anvil cell experiments was conducted to constrain the equilibrium distribution of molecular H2 between H2O-saturated sodium aluminosilicate melts and H2O at elevated temperatures (600–800 °C) and pressures (317–1265 MPa). The distribution of H2 between the silicate liquid and the aqueous fluid was achieved through real-time monitoring of the H-H stretching vibration under in situ conditions using Raman vibrational spectroscopy. Results show that the solubility of H2 in silicate melts saturated with H2O decreases as the temperature increases, with control exerted by the mole fraction of H2O in the melt. The dissolution of H2 in the hydrous silicate melts appears to follow Henrian behavior, resembling that of an inert, neutral non-polar species. To express species solubility as a function of temperature (T in K) an empirical equation was developed:

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硅酸盐熔体中的分子 H2

为了在高温（600-800 °C）和高压（317-1265 兆帕）条件下确定 H2O 饱和铝硅酸钠熔体与 H2O 之间 H2 分子的平衡分布，我们进行了一系列水热金刚石砧槽实验。通过拉曼振动光谱法实时监测原位条件下的 H-H 伸展振动，实现了 H2 在硅酸盐液体和水性流体之间的分布。结果表明，随着温度的升高，H2 在饱和 H2O 的硅酸盐熔体中的溶解度降低，而熔体中 H2O 的摩尔分数对溶解度起控制作用。H2 在含水硅酸盐熔体中的溶解似乎遵循 Henrian 行为，类似于惰性中性非极性物种的溶解。为了将物种溶解度表示为温度（T，单位 K）的函数，建立了一个经验方程：

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来源期刊

Geochimica et Cosmochimica Acta 地学-地球化学与地球物理

CiteScore

9.60

自引率

14.00%

发文量

437

审稿时长

6 months

期刊介绍： Geochimica et Cosmochimica Acta publishes research papers in a wide range of subjects in terrestrial geochemistry, meteoritics, and planetary geochemistry. The scope of the journal includes: 1). Physical chemistry of gases, aqueous solutions, glasses, and crystalline solids 2). Igneous and metamorphic petrology 3). Chemical processes in the atmosphere, hydrosphere, biosphere, and lithosphere of the Earth 4). Organic geochemistry 5). Isotope geochemistry 6). Meteoritics and meteorite impacts 7). Lunar science; and 8). Planetary geochemistry.