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IR spectroscopic characterisation of hydrous species in minerals

By
Eugen Libowitzky
Eugen Libowitzky
Institut für Mineralogie und Kristallographie, Universität Wien – Geozentrum, Althanstr. 14, A-1090 Wien, Austria
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Anton Beran
Anton Beran
Institut für Mineralogie und Kristallographie, Universität Wien – Geozentrum, Althanstr. 14, A-1090 Wien, Austria
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Published:
January 01, 2004

Abstract

Hydrogen is a major, a minor, and a trace constituent of a broad variety of minerals in the Earth's lithosphere. Usually bonded to oxygen in the structures of minerals (in the form of OH- and H2O, rarely also as H3O+, forumlaand forumla groups) it contributes to the formation of stoichiometric hydrates and hydroxides, many of them with economic importance, such as zeolites, gypsum CaSO4 · 2H2O, manganite MnO(OH) etc. Even though these stoichiometric hydrous phases are most common in the upper crust, they also persist to greater depths in subduction zones and may be responsible for recycling of water (Pawley, 1994) down to the mantle region (e.g. lawsonite, talc, K-amphiboles etc.). Because of the enormous volume of the Earth's mantle, nominally anhydrous minerals under the high P/T conditions of the Earth's mantle that contain hydrogen only as minor or trace constituents, play an important role for the water budget of the Earth (Beran, 1999 still a controversy as to whether the mantle is rather enriched (Thompson, 1992) or depleted (Dixon et al., 2002) in hydrogen through the activity of subduction zones.

Even as a trace constituent, hydrogen has a strong influence on chemical and physical properties of mineral phases (Mackwell et al., 1985) and thus deserves thorough investigation. It may be responsible for dramatic changes of mechanical properties, e.g. in the case of hydrolytic weakening of quartz (Griggs, 1967; Kronenberg et al., 1986), it has a major impact on the formation of melts and their rheology (Hirth & Kohlstedt, 1996),

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Contents

European Mineralogical Union Notes in Mineralogy

Spectroscopic methods in mineralogy

Anton Beran
Anton Beran
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Eugen Libowitzky
Eugen Libowitzky
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Mineralogical Society of Great Britain and Ireland
Volume
6
ISBN electronic:
9780903056519
Publication date:
January 01, 2004

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