Jump to ContentJump to Main Navigation
Geochemical Reaction ModelingConcepts and Applications$
Users without a subscription are not able to see the full content.

Craig M. Bethke

Print publication date: 1996

Print ISBN-13: 9780195094756

Published to Oxford Scholarship Online: November 2020

DOI: 10.1093/oso/9780195094756.001.0001

Show Summary Details
Page of

PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 16 June 2021

Polythermal, Fixed, and Sliding Paths

Polythermal, Fixed, and Sliding Paths

12 Polythermal, Fixed, and Sliding Paths
Geochemical Reaction Modeling

Craig M. Bethke

Oxford University Press

In this chapter we consider how to construct reaction models that are somewhat more sophisticated than those discussed in the previous chapter, including reaction paths over which temperature varies and those in which species activities and gas fugacities are buffered. The latter cases involve the transfer of mass between the equilibrium system and an external buffer. Mass transfer in these cases occurs at rates implicit in solving the governing equations, rather than at rates set explicitly by the modeler. In Chapter 14 we consider the use of kinetic rate laws, a final method for defining mass transfer in reaction models. Polythermal reactions paths are those in which temperature varies as a function of reaction progress, ξ. In the simplest case, the modeler prescribes the temperatures T0 and Tf at the beginning and end of the reaction path. The model then varies temperature linearly with reaction progress. This type of model is sometimes called a “sliding temperature” path. The calculation procedure for a sliding temperature path is straightforward. In taking a reaction step, the model evaluates the temperature to be attained at the step’s end.

Keywords:   "Flush" configuration, Albite, dissolution of, Deprotonation reactions, Fixed activity path, Fixed fugacity path, Fluid cooling, Ion pairing, Polythermal path, Sliding activity path, Speciation diagrams

Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.

Please, subscribe or login to access full text content.

If you think you should have access to this title, please contact your librarian.

To troubleshoot, please check our FAQs , and if you can't find the answer there, please contact us .