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Mineral replacement reactions; from macroscopic observations to microscopic mechanisms

A. Putnis
Mineral replacement reactions; from macroscopic observations to microscopic mechanisms (in Mineralogy for the new millennium, Ian Parsons (editor))
Mineralogical Magazine (October 2002) 66 (5): 689-708

Abstract

Mineral replacement reactions take place primarily by dissolution-reprecipitation processes. Processes such as cation exchange, chemical weathering, deuteric alteration, leaching, pseudomorphism, metasomatism, diagenesis and metamorphism are all linked by common features in which one mineral or mineral assemblage is replaced by a more stable assemblage. The aim of this paper is to review some of these aspects of mineral replacement and to demonstrate the textural features they have in common, in order to emphasize the similarities in the underlying microscopic mechanisms. The role of volume change and evolution of porosity is explored both from natural microtextures and new experiments on model replacement reactions in simple salts. It is shown that the development of porosity is often a consequence of mineral replacement processes, irrespective of the relative molar volumes of parent and product solid phases. The key issue is the relative solubility of the phases in the fluid phase. Concepts such as coupled dissolution-precipitation, and autocatalysis are important in understanding these processes. Some consequences of porosity generation for metamorphic fluid flow as well as subsequent crystal growth are also discussed.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 66
Serial Issue: 5
Title: Mineral replacement reactions; from macroscopic observations to microscopic mechanisms
Title: Mineralogy for the new millennium
Author(s): Putnis, A.
Author(s): Parsons, Ianeditor
Affiliation: University of Muenster, Institut fuer Mineralogie, Munster, Federal Republic of Germany
Affiliation: University of Edinburgh, Department of Geology and Geophysics, Edinburgh, United Kingdom
Pages: 689-708
Published: 200210
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
Meeting name: 18th general meeting of the International Mineralogical Association
Meeting location: Edinburgh, GBR, United Kingdom
Meeting date: 200209Sept. 2002
References: 95
Accession Number: 2002-073352
Categories: General mineralogy
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200223
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