Dobnikar Meta

Dolenec M.

Ogorelec Bojan

English

University of Szeged

Acta Mineralogica-Petrographica, Abstract Series 4, Szeged, 2004 MINERALOGY OF CLAYS ON PERMO-TRIASSIC BOUNDARY TRANSITION IN KARAVANKE MOUNTAINS (BRSNINA SECTION) DOBNIKAR. M..' DOLENEC. M.,1 OGORELEC, B.2 1 Faculty of Natural Sciences and Engineering, University of Ljubljana [Naravoslovnotehniska fakulteta, Univerza v Ljubljani], Askerceva c. 12, Ljubljana, 1000, Slovenia 2 Geological Survey of Slovenia [GeoloSki zavod Slovenije], Dimiceva 12, Ljubljana, 1000, Slovenia E-mail: meta.dobnikar@ntfgeo.uni-lj.si The end Permian mass extinction at approximately 250 Ma ago was one of the most severe mass extinction of the Earth. The high-resolution study of the two Permo-Triassic boundary sections in Western Slovenia (Idrijca Valley and Masore section) and one in the Karavanke Mountains (Brs-nina section) reveal that the main extinction occurred over a period of less than 100,000 year. It is supposed to be coinci-dental with the terminal phase of the end Permian marine re-gression, the eruption of the Siberian basalts and with a sharp spike 5 I 3C carb, 5 l 3Corg, 6 I 8 0 as well as by a negative Ce anomaly and the enrichment in several major, minor and trace elements at the P/Tr boundary which is represented in Idrijca Valley section in clayey marl layer (0.8 cm) and in Brsnina section by a boundary clay (1 cm). In this study we represent the XRD-analyses of clay and/or clayey marl layers from the Upper Permian to Lower Triassic sedimentary se-quence of the Brsnina section in the Karavanke Mountains. The aim of this study was to reveal the possible changes in the clay minerals composition at the P/Tr boundary transition most probably due to increased erosion and environmental changes which are supposed to suggest a causal relation bet-ween Siberian volcanic activity and significant impact on land and land species as well. 28 www. sei. u-szeged. hu/asvanytar>/acta. htm 28 

Mineralogy of clays on permo-triassic boundary transition in Karavanke Mountains (Brsnina section)

http://acta.bibl.u-szeged.hu/31574/1/mineralogica_as_004_028.pdf

Mineralogy of clays on permo-triassic boundary transition in Karavanke Mountains (Brsnina section)

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University of Szeged