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On the origin of zoned grossular-andradite garnets in hydrothermal systems

Bjorn Jamtveit, Kristin Vala Ragnarsdottir and Bernard J. Wood
On the origin of zoned grossular-andradite garnets in hydrothermal systems
European Journal of Mineralogy (December 1995) 7 (6): 1399-1410

Abstract

A study of grandite-solution-aqueous-solution equilibria has shown that the grandite composition is very sensitive to variations in T, pH, fO (sub 2) and salinity of the hydrothermal solution because of the difference in the aqueous complexation behaviour between Al and Fe. P variation has little effect, but may indirectly affect the garnet composition through P-sensitive equilibria that involve other minerals. The effects of variable kinetic dispersion in a hydrothermal system with fluctuations in the fluid flow rate are illustrated through a low-order reaction and transport model; this indicates that fluid flow rates >><$I> 1 mu m/s may cause significant dispersion effects on the composition of grandites growing <<<$I> approximately 100 m from an intrusive contact. The origin of oscillatory zoned garnets from the Oslo rift is discussed.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 7
Serial Issue: 6
Title: On the origin of zoned grossular-andradite garnets in hydrothermal systems
Affiliation: University of Oslo, Department of Geology, Oslo, Norway
Pages: 1399-1410
Published: 199512
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 45
Accession Number: 1996-014813
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, 1 plate
Secondary Affiliation: University of Bristol, GBR, United Kingdom
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199606
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