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K-Ar dating of the last metamorphic events in different tectonic units of the western margin of the Bohemian Massif

Please always quote using this URN: urn:nbn:de:bvb:20-opus-87527
  • K-Ar dating on hornblendes and micas from the TepläDomazlice zone revealed a pattern of dates which significantly deviates from the mid-Carboniferous to early Permian one that is found in the adjacent low-pressure metamorphic Moldanubian and Saxothuringian. Especially for the Mariänske Läzne metabasic complex, confirming early Czech determinations, the dates resemble the early Devonian pattern determined for the Münchberg Gneiss Massif and the Erbendorf-Vohenstrauß zone of northeastern Bavaria. This supports the idea that all three units areK-Ar dating on hornblendes and micas from the TepläDomazlice zone revealed a pattern of dates which significantly deviates from the mid-Carboniferous to early Permian one that is found in the adjacent low-pressure metamorphic Moldanubian and Saxothuringian. Especially for the Mariänske Läzne metabasic complex, confirming early Czech determinations, the dates resemble the early Devonian pattern determined for the Münchberg Gneiss Massif and the Erbendorf-Vohenstrauß zone of northeastern Bavaria. This supports the idea that all three units are remnants of a huge complex which suffered a metamorphic overprint under medium-pressure conditions, probably in the early Devonian. Streng rejuvenation is found in the southern part of the Teplä-Domailice zone by which micas and even two hornblendes were reset to mid-Carboniferous ages. According to the geological setting, part of the apparently preDevonian dates may be explained by inherited argon from earlier metamorphic and magmatic events, e.g. the high-pressure metamorphism documented in eclogitic relics. However, excess argon, caused by the mid-Carboniferous overprint cannot be excluded.show moreshow less

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Metadaten
Author: Hans Kreuzer, Zdenek Vejnar, Ulrich Schüssler, Martin Okrusch, Eberhard Seidel
URN:urn:nbn:de:bvb:20-opus-87527
Document Type:Conference Proceeding
Faculties:Fakultät für Geowissenschaften (bis Sept. 2007) / Institut für Mineralogie und Kristallstrukturlehre
Language:English
Year of Completion:1988
Source:In: Proceedings of the 1st International Conference on the Bohemian Massif 26.9.- 3.10.1988 Prag,1988, S. 168-175
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften
GND Keyword:Geochemie
Release Date:2014/07/17
Licence (German):License LogoDeutsches Urheberrecht