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Reactions behaviour during kelyphite and symplectite formation; a case study of mafic granulites and eclogites from the Bohemian Massif

B. Messiga and E. Bettini
Reactions behaviour during kelyphite and symplectite formation; a case study of mafic granulites and eclogites from the Bohemian Massif
European Journal of Mineralogy (February 1990) 2 (1): 125-144

Abstract

The regression of these high-grade metamorphic assemblages takes place by the development of coronite rims between garnet and pyroxenes, symplectite replacements after sodic pyroxenes and kelyphite overgrowths on garnet. The garnet may show an outer coronitic reaction boundary and an inner kelyphitic rim. The retrograde P-T path was dominated by a decrease in P. The trajectory may be characterized initially by an increasing T during the completion of the corona-forming reaction; the later retrograde path is characterized by slight undercooling during symplectite formation and then by an increase in undercooling which occurred during kelyphite formation. The equilibration rate was shown in retrograde anhydrous assemblages and these rocks preserve widespread relics of climax conditions. In the hydrous assemblages, the presence of water enhanced the reaction rate, enlarging the reaction domains.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 2
Serial Issue: 1
Title: Reactions behaviour during kelyphite and symplectite formation; a case study of mafic granulites and eclogites from the Bohemian Massif
Affiliation: Univ. Pavia, Dip. Sci. Terra, I-27100 Pavia, Italy
Pages: 125-144
Published: 199002
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 45
Accession Number: 1992-062503
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables, 58 anals.
N48°07'00" - N49°01'60", E13°25'00" - E16°07'60"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1992
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