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GEOREF RECORD

Eclogites from the Czech part of the Erzgebirge; multi-stage metamorphic and structural evolution

Helena Klapova, Jiri Konopasek and Karel Schulmann
Eclogites from the Czech part of the Erzgebirge; multi-stage metamorphic and structural evolution
Journal of the Geological Society of London (May 1998) 155, Part 3: 567-583

Abstract

A structural and petrological study of these Saxothuringian eclogites revealed their polyphase thermal and tectonic evolution. The first stage involved eclogite-facies metamorphism of mafic rocks at 26 kbar and 650-700 degrees C; the preferred orientation of their clinopyroxenes is consistent with high-T flow. The second stage involved the transport of eclogitic rocks at the base of a crustal nappe and their large-scale folding; during this stage, high-P-high-T (14.5 kbar/600 degrees C) assemblages developed in the surrounding metapelites while eclogites were preserved in passively transported eclogitic boudins. Heat advection and similar P-T conditions in the surrounding crustal material were responsible for the stability of mineral assemblages and precluded closure of isotopic systems in the eclogites; thus the published isotopic ages for the eclogites reflect not the subduction stage but the age of cooling under crustal conditions. The final stage of deformation was marked by development of a heterogeneous network of ductile retrograde shear zones and involved a fluid influx. EPMA results are reported for omphacite, garnet, zoisite, white mica and amphiboles.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 155, Part 3
Title: Eclogites from the Czech part of the Erzgebirge; multi-stage metamorphic and structural evolution
Affiliation: Charles University, Institute of Petrology and Structural Geology, Prague, Czech Republic
Pages: 567-583
Published: 199805
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 75
Accession Number: 1998-038413
Categories: Igneous and metamorphic petrologyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
N48°34'60" - N51°02'60", E12°22'60" - E18°53'60"
N50°10'00" - N51°00'00", E12°00'00" - E14°10'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Update Code: 199815
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