The rates and extent of textural equilibration in high-temperature fluid-bearing systems

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doi: 10.1016/S0009-2541(99)00124-2
Authors:Holness, M. B.; Siklos, S. T. C.
Author Affiliations:Primary:
University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
Volume Title:Rates and timescales of magmatic processes
Volume Authors:Rogers, Nick W., editor
Source:Chemical Geology, 162(2), p.137-153; Rates and timescales of magmatic processes, London, United Kingdom, Nov. 12-13, 1997, edited by Nick W. Rogers. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:2000
Note:In English. Includes appendix. 85 refs.; illus., incl. 2 tables
Summary:The geometry of fluid-filled pores in texturally equilibrated aggregates can, in theory, be uniquely determined given the porosity and the equilibrium dihedral angle for all possible orientations and combinations of the constituent solid phases. While it is useful to be able to do this, one should also ask whether, and to what extent, textural equilibrium is actually attained during fluid-present intervals in high-temperature rocks. In fact, textural equilibrium may be only rarely attained during melting of crustal rocks, and equilibration under mid-ocean ridges is possibly incomplete to depths as great as the garnet stability zone. There is very little published information on the rates of attainment of textural equilibrium in fluid-bearing geological environments. The available experimental data for the rates of growth of equilibrated domains are consistent with a power-law relationship between domain size and equilibration time with an exponent between 2 and 3. A simplified theoretical treatment of pore shape change governed by the Gibbs-Thompson relationship demonstrates that an exponent of 3 is to be expected for equilibration by diffusion within the fluid phase, with an effective diffusivity consistent with the available data. Abstract Copyright (2000) Elsevier, B.V.
Sections:Petrology
Subsections:Igneous petrology
Subjects:Amphibole group; Chain silicates; Fluid phase; Geometry; Grain boundaries; High temperature; Igneous rocks; Inclusions; Magmas; Mathematical models; Nesosilicates; Olivine; Olivine group; Orthopyroxene; Orthosilicates; Phase equilibria; Polycrystalline materials; Porosity; Pyroxene group; Rates; Reaction rims; Silicates; Temperature; Textures; Theoretical studies; Two-dimensional models; Xenoliths
Abstract Numbers:00M/4323
Record ID:2000011962
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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