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GEOREF RECORD

Almandine-rich garnet from near Collobrieres, southern France, and its petrological significance

Alan B. Woodland, Giles Droop and Hugh St. C. O'Neill
Almandine-rich garnet from near Collobrieres, southern France, and its petrological significance
European Journal of Mineralogy (February 1995) 7 (1): 187-194

Abstract

Garnets from metamorphosed ironstones near Collobrieres (Var), are among the most iron-rich yet reported. They occur in a fayalite-grunerite-magnetite-apatite assemblage with estimated peak metamorphic conditions 630 + or - 60 degrees C, 5 + or - 2 kbar. Six garnets were characterized by EPMA, XRD and Moessbauer spectrometry. On an Fe (super 3+) -free basis, five of the garnets contain approximately 95 mol % almandine and one contains >> 97 mol % almandine (a 11.5377 Aa). Moessbauer spectra indicate a uniform Fe (super 3+) /Sigma Fe = 0.03; this exceeds the amount that can be accounted for as an andradite component and it is suggested that a skiagite component must be considered. The occurrence of fayalite indicates relatively reduced metamorphic conditions, below FMQ. The presence of Fe (super 3+) in these garnets could suggest that similar or larger amounts of Fe (super 3+) should be expected in aluminous garnets in medium- and high-grade metamorphic rocks.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 7
Serial Issue: 1
Title: Almandine-rich garnet from near Collobrieres, southern France, and its petrological significance
Affiliation: Universita1.t Bayreuth, Bayerisches Geoinstitut, Bayreuth, Federal Republic of Germany
Pages: 187-194
Published: 199502
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 25
Accession Number: 1995-021751
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N42°30'00" - N51°00'00", W05°00'00" - E08°30'00"
Secondary Affiliation: University of Manchester, 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: 199508
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