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Re-equilibration of zircon in aqueous fluids and melts

Thorsten Geisler, Urs Schaltegger and Frank Tomaschek
Re-equilibration of zircon in aqueous fluids and melts
Elements (February 2007) 3 (1): 43-50

Abstract

Natural zircon crystals often show complex secondary textures that cut across primary growth zones. In zircon showing structural damage cause by self-irradiation, such textures are the result of a diffusion-reaction process in which a hydrous species diffuses inwards and "catalyzes" structural recovery. Nanoscale pores develop, solvent elements such as Ca, Al and Fe are gained, and radiogenic Pb is lost. In both aqueous fluids and melts, replacement of zircon with undamaged structure by a coupled dissolution-reprecipitation process can produce similar textures. The reacted domains usually have lower trace element contents and may contain micrometer-sized pores and inclusions of uranium, thorium and/or yttrium phases, originally in solid solution. Both processes have considerable implications for zircon geochronology.


ISSN: 1811-5209
Serial Title: Elements
Serial Volume: 3
Serial Issue: 1
Title: Re-equilibration of zircon in aqueous fluids and melts
Affiliation: Universitaet Muenster, Institut fuer Mineralogie, Muenster, Federal Republic of Germany
Pages: 43-50
Published: 200702
Text Language: English
Publisher: Mineralogical Society of America and Mineralogical Society of Great Britain and Ireland and Mineralogical Association of Canada and Geochemical Society and Clay Minerals Society, International
References: 42
Accession Number: 2007-094589
Categories: Mineralogy of silicatesGeochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: Universite de Geneve, CHE, Switzerland
Country of Publication: International
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200720
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