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Common high-pressure metamorphic history of eclogite lenses and surrounding metasediments; a case study of calc-silicate reaction zones (Erzgebirge, Germany)

Juliane Gross, Michael Burchard, Hans-Peter Schertl and Walter V. Maresch
Common high-pressure metamorphic history of eclogite lenses and surrounding metasediments; a case study of calc-silicate reaction zones (Erzgebirge, Germany) (in From field observation to experimental petrology and back; a special issue to honour Werner Schreyer, Walter Maresch (editor), Edward Grew (editor) and Friedrich Seifert (editor))
European Journal of Mineralogy (October 2008) 20 (5): 757-775

Abstract

The Erzgebirge Dome in the Central European Variscides is a stack of crustal slices including some high- and ultrahigh-pressure rocks related to continent-continent collision. One such slice is the Mica-Schist/Eclogite Unit, in which the predominantly metasedimentary country rocks appear to record maximum metamorphic pressures of at most 11-13 kbar, whereas volumetrically minor eclogite lenses within the unit indicate pressures up to 27 kbar. In the present study, the P-T evolution of rocks found in calc-silicate reaction zones between eclogite and country rock marble near the locality Stuempelfelsen, a crag composed of eclogite near the village of Hammerunterwiesenthal, has been established via conventional geothermobarometry. A metasomatic marble-eclogite interchange can be documented for the earliest stages of prograde metamorphism. Significant amounts of fluorine infiltrated the metabasic rocks from the marbles, leading to fluorine-bearing amphibole as well as phengite, and even fluorine-rich growth zones in garnet with 0.62 wt.% F and 1.2 wt.% OH. This appears to be the first description of a F-bearing member of an almandine-grossular solid solution poor in andradite component. The P-T path of the eclogite-marble reaction zone reaches a maximum pressure of 26 kbar at 520-640 degrees C, just below the quartz-coesite transition. The exhumation path can be traced to 10 kbar and 450-600 degrees C, where it is then coincident with the published P-T paths of the mica schists and orthogneisses of the Mica-Schist/Eclogite Unit. This study indicates that the Stuempelfelsen eclogite lens and the surrounding metasedimentary country rock of the area must share a common high-pressure metamorphic history. The critical question arising for future studies is how much of the Mica-Schist/Eclogite Unit has actually "traveled the high-pressure eclogite route", and how much of it was never subducted to pressures greater than 11-13 kbar.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 20
Serial Issue: 5
Title: Common high-pressure metamorphic history of eclogite lenses and surrounding metasediments; a case study of calc-silicate reaction zones (Erzgebirge, Germany)
Title: From field observation to experimental petrology and back; a special issue to honour Werner Schreyer
Author(s): Gross, JulianeBurchard, MichaelSchertl, Hans-PeterMaresch, Walter V.
Author(s): Maresch, Waltereditor
Author(s): Grew, Edwardeditor
Author(s): Seifert, Friedricheditor
Affiliation: Ruhr-Universitaet Bochum, Institut fuer Geologie, Mineralogie, Geophysik, Bochum, Federal Republic of Germany
Pages: 757-775
Published: 200810
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 60
Accession Number: 2009-003333
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch maps
N55°53'60" - N55°53'60", E45°43'00" - E45°43'00"
Secondary Affiliation: Universitaet Heidelberg, DEU, Federal Republic of Germany
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200902

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