
Calculation methods for fluid composition and water-rock interaction in the deep Earth based on DEW model—a review
Chunyuan LAN, Lifei ZHANG, Renbiao TAO, Han HU, Lijuan ZHANG, Chao WANG
Calculation methods for fluid composition and water-rock interaction in the deep Earth based on DEW model—a review
Water-rock interactions can lead to changes in the valency and chemical form of elements in fluids and thereby affect the enrichment and mineralization of elements as well as their cycling fluxes. Due to limited availability of deep Earth samples and experimental data, establishing and utilizing models of deep aqueous fluids can effectively enhance our understanding of water-rock interactions in deep Earth. The Deep Earth Water (DEW) model is a database used to describe the thermodynamic properties of aqueous species in deep aqueous fluids, and it can be used together with mineral thermodynamic databases for modeling water-rock interactions in deep Earth. In this review, we discuss the necessity of using the DEW model to describe deep aqueous fluids. We first describe the basic principles of using the DEW model to calculate aqueous species in deep fluids resulting from water-rock interactions in deep Earth. We then introduce “FluidsLab”, a software we developed to calculate aqueous species, and summarize applications of the DEW model in deep Earth researches. Finally we discuss future application of the DEW model and its development directions.
water-rock interaction / subduction zones / deep Earth fluids / thermodynamic model / DEW model
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