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Pumpellyite in metapelites of the Schneeberg Complex (Eastern Alps, Austria)

Institute of Mineralogy and Petrology, Karl-Franzens, Universität Graz, Universitätsstraße 2, A-8010 Graz, Austria

^* E-mail: kurt.krenn{at}uni-graz.at

This paper describes the first findings of pumpellyite in fine-grained ductile deformed metapelites of the Schneeberg Complex as an indicator for high pressure-low temperature metamorphism. Microscopic observations of oriented samples indicate that pumpellyite is always associated with biotite and texturally arranged within arrays of early schistosities (S-C-textures and fold hinge areas). Post-deformational growth of pumpellyite is not observed. Textural, microprobe and Raman spectroscopic data of pumpellyite are compared with subduction related pumpellyite from New Caledonia and Afghanistan and point to a geodynamic setting of mineral growth during convergence and subduction within the Austroalpine continental crust.

Key-words: Schneeberg Complex, Eastern Alps, pumpellyite, micro-Raman-spectroscopy, prograde P-T path.