caa a22 4500 477064515 CHVBK 20180405111409.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF02422230 doi (NATIONALLICENCE)springer-10.1007/BF02422230 Geochemistry of early Palaeozoic amphibolites from the Orlica-Śnieżnik dome, Bohemian massif: petrogenesis and palaeotectonic aspects [Elektronische Daten] [P. Floyd, J. Winchester, J. Ciesielczuk, A. Lewandowska, J. Szczepanski, K. Turniak] Orthoamphibolites within and marginal to the Orlica-Śnieżnik dome in the eastern Bohemian massif are associated with a series of Proterozoic-Lower Palaeozoic supracrustal meta-sediments of the Stronie, Nové Město and Staré Město formations. Massive and variably foliated amphibolites range from common epidote-plagioclase-blue-green/green hornblende varieties to assemblages with diopside, garnet and brown amphibole. All the amphibolites have a basaltic composition and are divided into three main chemical groups which are intimately associated in the field: main series tholeiites, low-Ti tholeiites and alkali basalts. All groups exhibit a common enrichment in LIL elements+Nb+Ta (relative to high-field-strength elements) which reflects contamination by upper continental crust and/or pelagic sediment compositions. The gross chemistry of the tholeiitesapproaches that for MORB, although the geological environment and nature of crustal contamination suggests that the basaltic precursors were probably emplaced in a rifted ensialic basinal environment. If the amphibolites are representative of an early phase of the Lower Palaeozoic fragmentation of Gondwanaland, then rifting did not fully develop ocean crust. The wider significance of the chemical interpretation implies that some of the variation from Variscan Proterozoic-Palaeozoic metabasite suites that is ascribed to a complex of different eruptive settings could be accounted for by variable contamination and/or source composition. Springer-Verlag GmbH & Co KG, 1996 L. Palaeozoic volcanics nationallicence Amphibolites nationallicence Geochemistry nationallicence Petrogenesis nationallicence Crustal contamination nationallicence Palaeotectonic environment nationallicence Orlica-Śnieżnik dome, Bohemian massif nationallicence Floyd P. Department of Earth Sciences, University of Keele, ST5 5BG, Staffordshire, UK aut Winchester J. Department of Earth Sciences, University of Keele, ST5 5BG, Staffordshire, UK aut Ciesielczuk J. Department of Earth Sciences, Sosnowiec University, PL-41-200, Sosnowiec, Poland aut Lewandowska A. Institute of Geological Sciences, Jagiellonian University, PL-30-063, Kraków, Poland aut Szczepanski J. Institute of Geological Sciences, Warsaw University, Warsaw, Poland aut Turniak K. Institute of Geological Sciences, Warsaw University, Warsaw, Poland aut Geologische Rundschau Springer-Verlag 85/2(1996-06-01), 225-238 0016-7835 85:2<225 1996 85 531 https://doi.org/10.1007/BF02422230 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02422230 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Floyd P. Department of Earth Sciences, University of Keele, ST5 5BG, Staffordshire, UK aut NATIONALLICENCE 700 1- Winchester J. Department of Earth Sciences, University of Keele, ST5 5BG, Staffordshire, UK aut NATIONALLICENCE 700 1- Ciesielczuk J. Department of Earth Sciences, Sosnowiec University, PL-41-200, Sosnowiec, Poland aut NATIONALLICENCE 700 1- Lewandowska A. Institute of Geological Sciences, Jagiellonian University, PL-30-063, Kraków, Poland aut NATIONALLICENCE 700 1- Szczepanski J. Institute of Geological Sciences, Warsaw University, Warsaw, Poland aut NATIONALLICENCE 700 1- Turniak K. Institute of Geological Sciences, Warsaw University, Warsaw, Poland aut NATIONALLICENCE 773 0- Geologische Rundschau Springer-Verlag 85/2(1996-06-01), 225-238 0016-7835 85:2<225 1996 85 531 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer