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Relics of high-pressure metamorphism from the Grossglockner region, Hohe Tauern, Austria; paragenetic evolution and PT-paths of retrogressed eclogites

Edgar Dachs and Alexander Proyer
Relics of high-pressure metamorphism from the Grossglockner region, Hohe Tauern, Austria; paragenetic evolution and PT-paths of retrogressed eclogites
European Journal of Mineralogy (February 2001) 13 (1): 67-86

Abstract

Retrogressed eclogites occur embedded in mainly calcareous mica schists and greenschists of the Upper Schieferhulle. A four stage metamorphic evolution has been established. Stage I: relics of early pre-eclogite facies events (chlorite, actinolite, plagioclase and glaucophane, paragonite, clinozoisite) are preserved mainly in the cores of garnets. A peak metamorphic paragenesis (stage II) of garnet, omphacite, paragonite, (clino)zoisite, quartz and rutile + or - dolomite records conditions of approximately 17 kbar and 570 degrees C. In several instances, growth of coarse-grained barroisitic to actinolitic amphibole occurred during uplift, apparently still within the eclogite facies (stage III). The final emplacement in the present tectonic setting and co-metamorphism with the surrounding metasediments (stage IV) occurred at 5-6 kbar and 500-530 degrees C, causing severe hydration and retrograde alteration (symplectite formation), and transforming most of the eclogite bodies into garnet amphibolites and even greenschists. It is suggested that a major tectonic slice was injected into the evolving Pennine nappe stack during underthrusting of the Penninic units beneath the Austroalpine.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 13
Serial Issue: 1
Title: Relics of high-pressure metamorphism from the Grossglockner region, Hohe Tauern, Austria; paragenetic evolution and PT-paths of retrogressed eclogites
Affiliation: Universitaet Salzburg, Institut fuer Mineralogie, Salzburg, Austria
Pages: 67-86
Published: 200102
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 41
Accession Number: 2001-022810
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables, sketch map
N47°00'00" - N47°15'00", E12°00'00" - E13°15'00"
Secondary Affiliation: Universitaet Graz, AUT, Austria
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200108
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