K-Ar dating in the Teplá-Domazlice zone at the western margin of the Bohemian Massif
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- K-Ar dating on hornblendes and micas from the Tepla Domazlice 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 Marianske Lazne metabasic complex, confirming early Czech determinations, the dates resemble the early Devonian pattern determined for the Munchberg Gneiss Massif and the Erbendorf-Vohenstrau zone of northeastern Bavaria. This supports the idea that all three units areK-Ar dating on hornblendes and micas from the Tepla Domazlice 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 Marianske Lazne metabasic complex, confirming early Czech determinations, the dates resemble the early Devonian pattern determined for the Munchberg Gneiss Massif and the Erbendorf-Vohenstrau 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. Strong rejuvenation is found in the southern part of the Tepla-Domazlice 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 eciogitic relics. However, excess argon, caused by the mid-Carboniferous overprint cannot be excluded.…
Autor(en): | Hans Kreuzer, Zdenek Vejnar, Ulrich Schüssler, Martin Okrusch, Eberhard Seidel |
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URN: | urn:nbn:de:bvb:20-opus-31106 |
Dokumentart: | Konferenzveröffentlichung |
Institute der Universität: | Fakultät für Geowissenschaften (bis Sept. 2007) / Institut für Mineralogie und Kristallstrukturlehre |
Sprache der Veröffentlichung: | Englisch |
Erscheinungsjahr: | 1988 |
Originalveröffentlichung / Quelle: | In: Kukal, Z. (ed.): Proceedings of the 1st International Conference on the Bohemian Massif (26.09.-03.10.1988). - Prague: Czech Geological Survey, 1988, 168-175 |
Allgemeine fachliche Zuordnung (DDC-Klassifikation): | 5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften |
Datum der Freischaltung: | 22.04.2009 |