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GEOREF RECORD

Garnetite-forming processes in the deep crust; the Val Fiorina case study (Ivrea-Verbano Zone, NW Alps)

Giorgio Rivalenti, Maurizio Mazzucchelli, Maria Adelaide Barbieri, Massimo Parenti, Rolf Schmid and Alberto Zanetti
Garnetite-forming processes in the deep crust; the Val Fiorina case study (Ivrea-Verbano Zone, NW Alps)
European Journal of Mineralogy (October 1997) 9 (5): 1053-1071

Abstract

In Val Fiorina, garnetite (garnet >><$I> 60%) is a prominent rock-type forming layers up to 10 m thick between granulite-facies metapelites and mafic-ultramafic lithologies. EPMA results show that the grossular content of the garnet increases from the metasediment contact towards the mafic rocks; almandine decreases and bulk-rock Y/Sc and Zr/Ti as well as initial (super 87) Sr/ (super 86) Sr decrease and K/Rb increases. Two hypotheses are proposed for genesis of the garnetites: either metasomatism taking place by interstitial melt retention in amphibolites and metapelites undergoing synchronous anatexis, or reaction between metapelite-derived anatectic melt and phases segregated from a basaltic sill during intrusion which induced partial melting in the country rocks. These hypotheses are discussed.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 9
Serial Issue: 5
Title: Garnetite-forming processes in the deep crust; the Val Fiorina case study (Ivrea-Verbano Zone, NW Alps)
Affiliation: Universita degli Studi di Modena, Dipartimento di Scienze della Terra, Modena, Italy
Pages: 1053-1071
Published: 199710
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 56
Accession Number: 1997-077053
Categories: Igneous and metamorphic petrologyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 3 tables
Secondary Affiliation: ETH Zentrum, Zurich, CHE, SwitzerlandCNR, Pavia, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199724
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