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Clay minerals from Permo-Carboniferous very low-grade metamorphic rocks from the central part of the Fore Sudetic Monocline (western Poland)

E. T. Sokalska^1,*, E. Dubiska¹, G. Kapro¹, J. A. Kozubowski^2, and M. Walski³

¹ Institute of Geochemistry, Mineralogy and Petrology, Faculty of Geology, Warsaw University, al. wirki i Wigury 93, 02-089 Warsaw, Poland,² Faculty of Materials Science and Engineering, Warsaw University of Technology, 141 Woloska Str., 02-507 Warsaw, Poland, and ³ Department of Cell Ultrastructure, Medical Research Centre, Polish Academy of Sciences, 5 Pawiskiego Str., 02-106 Warsaw, Poland

^* E-mail: e.t.sokalska{at}uw.edu.pl

(Received 26 September 2007; revised 4 December 2008)

The mafic rocks from boreholes studied here contain the assemblage typical for upper-subgreenschist to lower-greenschist facies (albite, chlorite, illite, titanite, quartz, Ti-oxide ± actinolite) as well as relict clinopyroxene. Metapelites underlying a metabasic rock sequence also record metamorphic alteration as demonstrated by the chlorite and illite crystallinities. Chlorite crystallinity suggests formation in conditions close to the subgreenschist/greenschist facies boundary, but this mineral is partly decomposed during metamorphic retrogression.

KEYWORDS: metabasic rocks, metapelites, XRD, HRTEM, chlorite crystallinity, greenschist-facies metamorphism, subgreenschist-facies metamorphism, Fore Sudetic Monocline