幼年安第斯火山碎屑岩的表面酸蚀变:玻璃成分对表面含氟化物矿物发育的影响

IF 3.6 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
J.A. Vila , G.L. Bia , S. Bengió , C. Balbis , L. Borgnino
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引用次数: 0

摘要

在火山爆发过程中,二氧化硫气体与玻璃碎片相互作用,有利于形成硫酸(H2SO4)气溶胶和富含氟(F)等有害元素的涂层。本研究讨论了普耶胡火山和拉宁火山喷出的安第斯幼年火成碎屑岩在酸性风化过程中形成的含氟化合物,以及它们向含水储层释放氟的潜力。利用 XPS 对硅、铝和 O 进行了表面化学成分和固体规格分析。为了解含 S 化合物释放 F 的情况,进行了批量实验。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Surface acid alteration of juvenile Andean pyroclastic rocks: effect of glass composition on the development of surface fluoride-bearing minerals
During eruption, sulphur dioxide gas interacts with glass shards, favouring the formation of sulphuric acid (H2SO4) aerosols and coatings enriched in hazardous elements such as fluorine (F). This study discusses the formation of F-bearing compounds during acidic weathering of Andean juvenile pyroclastic rock emitted from Puyehue and Lanín volcanoes and their potential to release F into aqueous reservoirs. Surface chemical composition and solid speciation of Si, Al, and O were performed by XPS. Batch experiments were carried out to understand the release of F from S-bearing compounds.
When pyroclastic rocks are partially altered in H2SO4, a mixture of S-bearing compounds precipitates on the surface of the rock grains. These compounds precipitate as a result of the weathering process of pyroclastic rocks after hydrolysis of the aluminate and silicate groups. The composition of the precipitated compounds is influenced by the magmatic source. Consequently, mafic particles exhibit precipitated compounds enriched in Al, Mg, Ca, and Fe and are more altered compared to felsic particles. The hydrolysis process also promotes the release of F, which was originally associated with the aluminosilicate network. Once released, a proportion of the dissolved F either precipitates or re-adsorbed onto S-bearing compounds, eventually being transported into the environment.
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来源期刊
Chemical Geology
Chemical Geology 地学-地球化学与地球物理
CiteScore
7.20
自引率
10.30%
发文量
374
审稿时长
3.6 months
期刊介绍: Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.
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