The record of Periadriatic volcanism in the Eastern Alpine Molasse zone and its palaeogeographic implications |
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| Authors: | Brügel Dunkl Frisch Kuhlemann & Balogh |
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| Institution: | Institute of Geology, University of Tübingen, Sigwartstr. 10, D-72076 Tübingen, Germany,;Institute of Geology, University of Tübingen, Sigwartstr. 10, D-72076 Tübingen, Germany, and Laboratory for Geochemical Research, Hungarian Academy of Science, Budaörsi út 45, H-1112, Budapest, Hungary,;Institute of Nuclear Research, Hungarian Academy of Science, Bem tér 18/c, H-4026 Debrecen, Hungary |
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| Abstract: | Precise provenance analysis of andesite and dacite pebbles from conglomerates in the Eastern Alpine Molasse zone, using geochemical and geochronological methods, provides evidence for a synorogenic volcanic chain in the Eastern Alps which is completely eroded today. This volcanism was related to Periadriatic magmatism along the Periadriatic lineament and took place in the Palaeogene, roughly between 40 and 30 Ma. The occurrence of remnants of these volcanic rocks together with other marker lithologies in the Eastern Alpine Molasse, implies an early to middle Miocene drainage system which was, in some respects, similar to the present Inn river system, but had a considerably larger catchment area, reaching farther south. The Palaeo-Inn drained the central and eastern sections of the Periadriatic magmatic belt to the northern foreland basin. |
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