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Quartz pseudomorphs after coesite in eclogites from the Saxonian Erzgebirge

Esther Schmaedicke
Quartz pseudomorphs after coesite in eclogites from the Saxonian Erzgebirge
European Journal of Mineralogy (April 1991) 3 (2): 231-238


Eclogites are intercalated in gneisses in the central and western Erzgebirge. Petrographically, they show a regional zonation from E (Floha Syncline) to W (Oberwiesenthal) with respect to the primary mineralogy, retrograde reactions and textures. Probable quartz pseudomorphs after coesite are described as inclusions in omphacite and garnet in the Floha Syncline rocks. New data are given on the composition of the eclogite assemblage. For the Floha Syncline eclogites, geothermobarometry indicates an equilibrium at about 700-800 degrees C and > or = 13-16 kbar with the higher temperature values in the east. A significantly lower temperature (about 650 degrees C) was obtained for an eclogite from the Oberwiesenthal area. Some aspects contribute to an "in situ" model rather than a "foreign" one at least for the high-temperature eclogites of the Floha Syncline. The present results suggest that nappe tectonics is an essential feature in the geological evolution of the Erzgebirge whereas an overthrusting towards the west is favoured.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 3
Serial Issue: 2
Title: Quartz pseudomorphs after coesite in eclogites from the Saxonian Erzgebirge
Author(s): Schmaedicke, Esther
Affiliation: Bergakad. Freiberg, Wiss. Geochem./Mineral., Fachber. Geowiss., Freiberg, Federal Republic of Germany
Pages: 231-238
Published: 199104
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 2 p.
Accession Number: 1994-002318
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 anals., 1 table, geol. sketch map
N50°10'00" - N51°00'00", E12°00'00" - E14°10'00"
N50°22'00" - N52°30'00", E11°00'00" - E15°04'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, Germany
Update Code: 199402
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