风化反应中溶质的同位素比值-放电关系

IF 1.9 3区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
J. Druhan, P. Benettin
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引用次数: 0

摘要

到目前为止,绝大多数试图将流量与溶质浓度联系起来的研究都是基于流域中流体年龄分布的时间不变表示。随着越来越详细的空间和时间数据集可用于风化衍生的河流溶质浓度,将这种质量通量与反应流体通过临界区环境的瞬态路径联系起来的能力对于定量解释至关重要。流体年龄分布和这些地质溶质的稳定同位素比率之间的关系甚至还不太发达,但这些特征对于解析产生浓度-排放关系的水-岩-生命相互作用套件至关重要。在这里,我们首次将具有时变流体年龄分布的水文模型与同位素分馏风化反应的地球化学模型相结合。以SiO2(aq)和相应的硅同位素比率δ30Si为例,我们表明风化反应产生的河流溶质的稳定同位素特征反映了相应溶质浓度所特有的流体年龄分布成分。这种独特的敏感性是同位素比率与描述给定流域的年龄分布参数之间更强联系的结果。这种新的建模框架用于为解释分布在不同气候、地质和生态系统中的六个低阶流中的SiO2(aq)和δ30Si提供定量基础。据我们所知,这是第一个描述受时变放电影响的流域风化反应产生的溶质同位素特征的正演和基于过程的模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Isotope Ratio – Discharge Relationships of Solutes Derived From Weathering Reactions
To date, the vast majority of studies seeking to link discharge to solute concentrations have been based on representations of fluid age distributions in watersheds that are time-invariant. As increasingly detailed spatial and temporal datasets become available for weathering-derived riverine solute concentrations, the capacity to link this mass flux to transient routing of reactive fluids through Critical Zone environments is vital to quantitative interpretation. Relationships between fluid age distributions and the stable isotope ratios of these geogenic solutes are even less developed, yet these signatures are vital to parsing the suite of water-rock-life interactions that create concentration-discharge relationships. Here we offer the first merging of a hydrological model featuring time-variant fluid age distributions with a geochemical model for isotopically fractionating weathering reactions. Using SiO2(aq) and the corresponding silicon isotope ratio δ30Si as an example, we show that the stable isotope signatures of riverine solutes produced by weathering reactions reflect a component of the fluid age distribution that is unique to the corresponding solute concentrations. This distinct sensitivity is the result of a stronger link between isotope ratios and the age distribution parameters describing a given watershed. This novel modeling framework is used to provide a quantitative basis for the interpretation of SiO2(aq) and δ30Si in six low-order streams spread across a diversity of climates, geologies, and ecosystems. To our knowledge, this is the first forward and process-based model to describe the isotopic signatures of solutes derived from weathering reactions in watersheds subject to time-varying discharge.
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来源期刊
American Journal of Science
American Journal of Science 地学-地球科学综合
CiteScore
5.80
自引率
3.40%
发文量
17
审稿时长
>12 weeks
期刊介绍: The American Journal of Science (AJS), founded in 1818 by Benjamin Silliman, is the oldest scientific journal in the United States that has been published continuously. The Journal is devoted to geology and related sciences and publishes articles from around the world presenting results of major research from all earth sciences. Readers are primarily earth scientists in academia and government institutions.
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