Journal article
High-Ti muscovite as a prograde relict in high pressure granulites with metamorphic Devonian zircon ages (Běstvina granulite body, Bohemian Massif): Consequences for the relamination model of subducted crust
R Nahodilová, P Štípská, R Powell, J Košler, M Racek
Gondwana Research | ELSEVIER SCIENCE BV | Published : 2014
Abstract
High-pressure kyanite-K-feldspar granulites in the Běstvina granulite body, which belongs to the Variscan orogenic root in the Bohemian Massif, preserve muscovite, rutile and kyanite inclusions in garnet. High-Ti muscovite (Ti=0.09-0.20p.f.u., Si=0.21-3.24p.f.u.) included in garnet is associated with quartz and is in crystallographic continuity with biotite, interpreted in terms of exsolution from an original less-dioctahedral higher-Ti muscovite. The assemblage garnet-kyanite-antiperthite-perthite-quartz-rutile and the mineral compositions indicate a peak of metamorphism at about 900°C and 17-21kbar, based on P-T pseudosection modeling, ternary-feldspar and Zr-in-rutile thermometry. The mat..
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Awarded by Ministerstvo Školství, Mládeže a Tělovýchovy
Funding Acknowledgements
We gratefully acknowledge the support of the Czech National Grant Agency (P210/10/0249 to W. Faryad; P210/10/P475 to M. R.), and the Czech Geological Survey (internal grant 323000 to R.N.). P.S. acknowledges also the Ministry of Education of the Czech Republic (grant LK11202 to K. Schulmann). T. Theye from the Institute of Mineralogy at the University of Stuttgart is acknowledged for operating the microprobe and E. Skrzypek is thanked for useful discussions about the significance of zircon ages.