Original scientific paper

Preliminary results on degree of thermal alteration recorded in the eastern part of Mt. Papuk, Slavonia, Croatia

Vanja Biševac ; University of Zagreb, Faculty of Science
Dražen Balen ; University of Zagreb, Faculty of Science
Darko Tibljaš ; University of Zagreb, Faculty of Science
Darko Španić ; Research and Development Sector, INA – Industrija nafte d. d. – Corporate Processes

Abstract

Samples from the Radlovac metamorphic complex, together with others from the overlying sedimentary rocks, and parts of Psunj metamorphic complex beneath it were studied in order to better constrain metamorphic conditions that have prevailed in the area. Rocks from Mt. Papuk were investigated, in order to determine thermal conditions, by Kübler index (illite “crystallinity”) and Árkai index (chlorite “crystallinity”) while the b0-parameter of K-white mica was used to estimate the pressure conditions. Treatment with dimethyl-sulfoxide (DMSO) was used in order to extend application of chlorite “crystallinity” measurements to kaolinite bearing samples. Results suggest temperatures between 250–300°C and pressures of 2–3 kb. Similar temperature data recorded from various lithologies implies the existence of a previously unknown post lower Triassic thermal event, (Alpine very low to low-grade metamorphism) affecting different complexes on Mt. Papuk. New data presented and discussed in this paper provides the basis for further research and interpretation of the tectono-metamorphic history of the studied area and its correlation with other similar European metamorphic complexes.

Keywords

Tisia; Mt. Papuk; very low to low-grade metamorphism; Kübler index; Árkai index; b0-parameter; DMSO treatment; geothermobarometry

Hrčak ID:

32779

URI

https://hrcak.srce.hr/32779

Publication date:

25.2.2009.

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