Fluid flow and chemical reaction kinetics in metamorphic systems

Journal Article · Sat May 01 00:00:00 EDT 1993 · American Journal of Science; (United States)

DOI:https://doi.org/10.2475/ajs.293.5.361· OSTI ID:6483825

Lasaga, A C; Rye, D M ^[1]

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1. Yale Univ., New Haven, CT (United States)

The treatment and effects of chemical reaction kinetics during metamorphism are developed along with the incorporation of fluid flow, diffusion, and thermal evolution. The interplay of fluid flow and surface reaction rates, the distinction between steady state and equilibrium, and the possible overstepping of metamorphic reactions are discussed using a simple analytic model. This model serves as an introduction to the second part of the paper, which develops a reaction model that solves the coupled temperature-fluid flow-chemical composition differential equations relevant to metamorphic processes. Consideration of stable isotopic evidence requires that such a kinetic model be considered for the chemical evolution of a metamorphic aureole. A general numerical scheme is discussed to handle the solution of the model. The results of this kinetic model allow us to reach several important conclusions regarding the factors controlling the chemical evolution of mineral assemblages during a metamorphic event. 41 refs., 19 figs., 5 tabs.

• OSTI ID: 6483825
• Journal Information: American Journal of Science; (United States), Vol. 293:5; ISSN 0002-9599
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
58 GEOSCIENCES
EARTH CRUST
GEOLOGIC MODELS
EARTH MANTLE
METAMORPHISM
CHEMICAL REACTION KINETICS
FLUID FLOW
CHEMICAL COMPOSITION
DIFFERENTIAL EQUATIONS
DIFFUSION
GEOCHEMISTRY
MATHEMATICAL MODELS
MINERALS
STABLE ISOTOPES
CHEMISTRY
EQUATIONS
ISOTOPES
KINETICS
REACTION KINETICS
420400* - Engineering- Heat Transfer & Fluid Flow
580000 - Geosciences