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Arsenopyrite oxidative dissolution in NaCl solution at high-temperature and high-pressure conditions: kinetics, pathways, dissolution mechanism and geological implications
Qingyou Liu; Kai Zheng; Shuai Wang; Luying Wang; Sen Lin; Heping Li
2022
Source PublicationContributions to Mineralogy and Petrology
Volume177
Abstract

Arsenopyrite (FeAsS) is one of the sulfide minerals of seafloor massive sulfide deposits. The presence of sodium chloride and high-temperature and high-pressure (HTHP) geological conditions seriously affect the process of arsenopyrite weathering. However, electrochemical oxidative dissolution has never been considered in the context of seafloors, though it has already been shown to increase dissolution significantly in terrestrial deposits. In this work, in situ electrochemical techniques and surface analysis were used to investigate the behaviors of oxidative arsenopyrite dissolution in different concentrations of NaCl at temperatures ranging from 280 to 360 °C and pressures ranging from 12.0 to 20.0 MPa. In the initial stage, arsenopyrite was oxidized to S0, As(III), and Fe(II). The S0 and As(III) were ultimately converted into SO42− and AsO43− and entered the solution. The Fe(II) was converted into α-FeOOH, γ-FeOOH, and Fe2O3 as a passivation film. The presence of Cl ions promoted the oxidative dissolution of arsenopyrite without changing its oxidation mechanism. Higher temperatures or greater pressures promoted the oxidative dissolution of arsenopyrite by enhancing charge migration and ion diffusion. Under the experimental HTHP conditions, the oxidative arsenopyrite dissolution rate constant was 8.0 × 10–5 mol∙m−2∙s−1. This work expands the understanding of the geochemical cycles of Fe, As and S and provides an experimental basis for the formation of secondary minerals from arsenopyrite weathering under the hydrothermal solution conditions of the seafloor.

DOI10.1007/s00410-022-01929-2
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Indexed BySCI
Language英语
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Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/13639
Collection地球内部物质高温高压实验室
地球深部物质与流体作用地球化学研究室
Affiliation1.Key Laboratory of High-Temperature and High-Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
2.Gannan Normal University, Ganzhou, 341400, China
3.University of Chinese Academy of Sciences, Beijing, 100049, China
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GB/T 7714
Qingyou Liu,Kai Zheng,Shuai Wang,et al. Arsenopyrite oxidative dissolution in NaCl solution at high-temperature and high-pressure conditions: kinetics, pathways, dissolution mechanism and geological implications[J]. Contributions to Mineralogy and Petrology,2022,177.
APA Qingyou Liu,Kai Zheng,Shuai Wang,Luying Wang,Sen Lin,&Heping Li.(2022).Arsenopyrite oxidative dissolution in NaCl solution at high-temperature and high-pressure conditions: kinetics, pathways, dissolution mechanism and geological implications.Contributions to Mineralogy and Petrology,177.
MLA Qingyou Liu,et al."Arsenopyrite oxidative dissolution in NaCl solution at high-temperature and high-pressure conditions: kinetics, pathways, dissolution mechanism and geological implications".Contributions to Mineralogy and Petrology 177(2022).
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