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Blueschist-facies metamorphism in the Kaczawa Mountains (Sudetes, SW Poland) of the Central-European Variscides: P-T constraints from a jadeite-bearing metatrachyte

Published online by Cambridge University Press:  05 July 2018

R. Kryza ,
A. P. Willner ,
H.-J. Massonne ,
A. Muszyński  and
H.-P. Schertl
R. Kryza*
Affiliation:
University of Wrocław, Institute of Geological Sciences, 50-205 Wrocław, Poland
A. P. Willner
Affiliation:
Universität Stuttgart, Institut für Mineralogie und Krystallchemie, 70174 Stuttgart, Germany Ruhr-Universität Bochum, Institute of Geology, Mineralogy and Geophysics, 44780 Bochum, Germany
H.-J. Massonne
Affiliation:
Universität Stuttgart, Institut für Mineralogie und Krystallchemie, 70174 Stuttgart, Germany
A. Muszyński
Affiliation:
Adam Mickiewicz University, Institute of Geology, 60-665 Poznań, Poland
H.-P. Schertl
Affiliation:
Ruhr-Universität Bochum, Institute of Geology, Mineralogy and Geophysics, 44780 Bochum, Germany
*
*E-mail: [email protected]
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Abstract

Sodic pyroxene is reported from an Ordovician metatrachyte of the Kaczawa Mountains, SW Poland. Its composition ranges from Jd0.98Ae0.02 to Jd0.15Ae0.85. Relict jadeite and phengite (up to 3.75 Si atoms per fomula unit) belong to the peak-pressure assemblage of an early HP-LT event. Later greenschist-facies stages are represented by riebeckite, biotite, chlorite, low-Si potassic white mica and actinolite. P-T pseudosections calculated for the range 200–450°C, 3–13 kbar allow evaluation of the conditions of formation of jadeite in the metatrachyte and derivaton of a P-T path. Considering the position of prograde, peak and retrograde metamorphic assemblages and respective mineral compositions, we can derive the following equilibration stages: 8.5±0.5 kbar, 270±20°C for the pressure maximum, 6.0±1.0 kbar, 310±20°C for the temperature maximum and 3.5±0.5 kbar, 280±20°C as well as <3.5 kbar, <280°C for the retrograde stages.

The metamorphic gradient for the peak-pressure is estimated at ∼10°C/km, which is typical of a subduction setting involving subducted continental crust, in particular of an exhumation channel within a collision zone of a microplate. Based on earlier structural observations, the ESE-oriented subduction in the NE Bohemian Massif was confined with WNW thrusting and followed by extension and ESE backward normal faulting during Devonian–Early Carboniferous times.

Keywords

jadeiteblueschist faciesmetatrachyteP-T pseudosectionSudetesVariscides
Type
Research Article
Information
Mineralogical Magazine , Volume 75 , Issue 1 , February 2011 , pp. 241 - 263
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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