@inproceedings{KreuzerVejnarSchuessleretal.1988, author = {Kreuzer, Hans and Vejnar, Zdenek and Sch{\"u}ssler, Ulrich and Okrusch, Martin and Seidel, Eberhard}, title = {K-Ar dating of the last metamorphic events in different tectonic units of the western margin of the Bohemian Massif}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-87527}, year = {1988}, abstract = {K-Ar dating on hornblendes and micas from the Tepl{\"a}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 Mari{\"a}nske L{\"a}zne metabasic complex, confirming early Czech determinations, the dates resemble the early Devonian pattern determined for the M{\"u}nchberg 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 Tepl{\"a}-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.}, subject = {Geochemie}, language = {en} } @inproceedings{SchuesslerVejnarOkruschetal.1988, author = {Sch{\"u}ssler, Ulrich and Vejnar, Z. and Okrusch, M. and Rose, S. and Seidel, E.}, title = {Geochemistry of Metabasites and gabbroic rocks from the Tepla-Domazlice zone}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-87511}, year = {1988}, abstract = {Various amphibolites, metagabbros and eclogitic relics of the Mari{\"a}nske L{\"a}zne complex, and amphibolites from the Cern{\"a} Hora Massif exhibit an uniform geochemical character which compares weil with modern mid-ocean ridge basalts. Geochemically these metabasites are similar to the amphibolites of the Myto area and to schistose, partly striped amphibolites of the neighbouring Tirschenreuth-M{\"a}hring Zone and the Erbendorf-Vohenstrauss Zone (Bavaria). Greenschists and amphibolites from the Domazlice metamorphic complex show an alkaline-basaltic tendency conforming to modern within-plate basalts or basalts from anomalaus midocean ridge segments. In their chemical character, these metabasites compare weil with the flaseramphibolites of the Erbendorf-Vohenstrauss Zone. Fine-grained amphibolites in the Warzenrieth area and (gabbro-) amphibolites in the Bl{\"a}tterberg-Hoher Bogen area show normal MORB character. The metamorphosed gabbroic rocks in the southern part of the Neukirchen-Kdyne (meta-) igneous complex are subalkaline - tholeiitic and exhibit a magmatic differentiation trend. They differ from the neighbouring amphibolites by generally lower contents of incompatible elements.}, subject = {Geochemie}, language = {en} }