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Kinetic theory of oxygen isotopic exchange between minerals and water

Criss, R. E. and Gregory, R. T. and Taylor, H. P., Jr. (1987) Kinetic theory of oxygen isotopic exchange between minerals and water. Geochimica et Cosmochimica Acta, 51 (5). pp. 1099-1108. ISSN 0016-7037. doi:10.1016/0016-7037(87)90203-1.

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Kinetic and mass conservation equations are used to describe oxygen isotopic exchange between minerals and water in “closed” and open hydrothermal systems. In cases where n coexisting mineral phases having different reaction rates are present, the exchange process is described by a system of n + 1 simultaneous differential equations consisting of n pseudo first-order rate equations and a conservation of mass equation. The simultaneous solutions to these equations generate curved exchange trajectories on δ-δ plots. Families of such trajectories generated under conditions allowing for different fluid mole fractions, different fluid isotopic compositions, or different fluid flow rates are connected by positive-sloped isochronous lines. These isochrons reproduce the effects observed in hydrothermally exchanged mineral pairs including 1) steep positive slopes, 2) common reversals in the measured fractionation factors (δ), and 3) measured fractionations that are highly variable over short distances where no thermal gradient can be geologically demonstrated.

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Additional Information:We thank Steve Edwards and Anne M. Hofmeister for valuable mathematical suggestions and Mary F. Horan for assistance in computer programming. F. Albarede, A. Matthews, C. M. Johnson, D. R. Cole, and J. G. Arth provided helpful critical comments. This is contribution #4435, Division of Geological and Planetary Sciences, Caltech.
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Caltech Division of Geological and Planetary Sciences4435
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ID Code:117391
Deposited By: Tony Diaz
Deposited On:13 Oct 2022 18:31
Last Modified:13 Oct 2022 18:31

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