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Book Chapter

Metal-ion partitioning during low-temperature precipitation and dissolution of anhydrous carbonates and sulphates

By
Michael E. Böttcher
Michael E. Böttcher
1
Geochemistry and Isotope Geochemistry Unit, Marine Geology Section, Leibniz Institute for Baltic Research, Seestrasse 15, D-18119 Warnemunde, Germany, e-mail: michael.boettcher@io-warnemuende.de
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Martin Dietzel
Martin Dietzel
2
Institute of Applied Geosciences, Graz University of Technology, Rechbauerstrasse 12, A-8010 Graz, Austria, e-mail: martin.dietzel@tugraz.at
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Published:
January 01, 2011

Abstract

Anhydrous carbonate and sulphate-bearing solids are formed on Earth under very different environmental conditions and are the most abundant constituents in so-called chemical sediments. At low temperatures, both biogenic and abiotic formation mechanisms are observed and their occurrence ranges from freshwater, via open marine to hypersaline aquatic environments. To understand individual mechanisms of mineral formation and the impact of boundary environmental conditions such as reaction temperature, composition of the aqueous mother fluid and precipitation rate, geochemical tracers such as trace metals or stable isotopes are needed. The thermodynamics of element partitioning in solid solutions-aqueous solutions (SS–AS) systems provides a frame for the evaluation of e.g. the impact of reaction kinetics, vital activity, or ionic strength. The presence of metastable phases may influence further reactions by providing the necessary reactants and surfaces for dissolution, adsorption, and re-precipitation reactions, thereby changing reaction kinetics in comparison to reactions in homogeneous solutions. The evaluation of trace-element substitution requires the combination of modelling approaches, in particular with experimental calibrations, but also empirical relationships. in this communication, the authors focus on selected binary carbonate and sulphate SS–AS systems at low temperatures. Systems involving the partitioning of Mg2+,Mn2+ and Sr2+ and others are discussed in more detail. They give a presentation of relevant current topics related to low-temperature metalion partitioning during complex precipitation and dissolution behaviour. The aim of this contribution is to stimulate future research in the highly relevant, low-temperature carbonate and sulphate SS–AS systems.

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Contents

European Mineralogical Union Notes in Mineralogy

Ion Partitioning in Ambient-Temperature Aqueous Systems

M. Prieto
M. Prieto
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H. Stoll
H. Stoll
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Mineralogical Society of Great Britain and Ireland
Volume
10
ISBN electronic:
9780903056441
Publication date:
January 01, 2011

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