caa a22 4500 606149368 CHVBK 20210128100533.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00531-015-1172-4 doi (NATIONALLICENCE)springer-10.1007/s00531-015-1172-4 Timing of igneous accretion, composition, and temporal relation of the Kassandra-Sithonia rift-spreading center within the eastern Vardar suture zone, Northern Greece: insights into Jurassic arc/back-arc systems evolution at the Eurasian plate margin [Elektronische Daten] [Nikolay Bonev, Peter Marchev, Robert Moritz, Petyo Filipov] In the Hellenides of northern Greece, the Kassandra-Sithonia and Central Chalkidiki ophiolites constitute the Vardar suture zone against the Serbo-Macedonian margin of Eurasia. The mafic-intermediate to acid members in the crustal section of the Kassandra-Sithonia ophiolites have N- and E-MORB signatures compatible with an origin in a back-arc spreading center. The MORB mantle source has received subduction zone input from the nearby Paikon arc system as revealed by LILE and LREE enrichments. A diorite from the Gerakini complex presumably belonging to the Central Chalkidiki ophiolites shows more enriched HFSE and REE patterns relative to MORB and Na-rich character compared to the Kassandra-Sithonia ophiolites. The Sithonia ophiolite crystallization spans from 159 to 149Ma, and the Gerakini complex diorite crystallized at 173Ma as derived from new U-Pb zircon geochronology. The main cluster of Permo-Carboniferous, a small cluster of Neoproterozoic-Cambrian and few Proterozoic, Ordovician, Devonian, Triassic and Middle Jurassic inherited zircons derive from the Serbo-Macedonian margin units. Thus, a Late Jurassic ca. 10Ma lasting igneous accretion of the Kassandra-Sithonia back-arc crust within the eastern Vardar zone is now well constrained and corroborated by Berriasian-Early Valanginian supra-ophiolite cover limestones. Instead of an affinity to the Central Chalkidiki ophiolites, the Gerakini diorite exhibits chemical similarity to the Chortiatis arc magmatic suite of the Circum-Rhodope belt within the eastern Vardar zone. The Gerakini diorite predates the Sithonia ophiolite in which the Chortiatis arc suite supplied Middle Jurassic inherited zircons. The Chortiatis arc compared with arc-related Evros ophiolites of the Circum-Rhodope belt in Thrace region shows the same 173-160Ma life span and tectonic setting, implying the extension of the arc systems across the north Aegean Sea. Based on these new temporal constraints, a tectonic scenario of Jurassic subduction settings and arc/back-arc systems development in the Maliac and Vardar oceanic basins is proposed that also accounts for continental magmatism in the Serbo-Macedonian margin of Eurasia. Springer-Verlag Berlin Heidelberg, 2015 Kassandra-Sithonia ophiolites nationallicence Geochemistry nationallicence U-Pb geochronology nationallicence Vardar zone nationallicence Greece nationallicence Bonev Nikolay Department of Geology, Paleontology and Fossil Fuels, Sofia University St Kliment Ohridski, 1504, Sofia, Bulgaria aut Marchev Peter Department of Geochemistry and Petrology, Geological Institute, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria aut Moritz Robert Section of Earth Sciences and Environment, University of Geneva, 1205, Geneva, Switzerland aut Filipov Petyo Department of Geochemistry and Petrology, Geological Institute, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria aut International Journal of Earth Sciences Springer Berlin Heidelberg 104/7(2015-10-01), 1837-1864 1437-3254 104:7<1837 2015 104 531 https://doi.org/10.1007/s00531-015-1172-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00531-015-1172-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bonev Nikolay Department of Geology, Paleontology and Fossil Fuels, Sofia University St Kliment Ohridski, 1504, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Marchev Peter Department of Geochemistry and Petrology, Geological Institute, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Moritz Robert Section of Earth Sciences and Environment, University of Geneva, 1205, Geneva, Switzerland aut NATIONALLICENCE 700 1- Filipov Petyo Department of Geochemistry and Petrology, Geological Institute, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria aut NATIONALLICENCE 773 0- International Journal of Earth Sciences Springer Berlin Heidelberg 104/7(2015-10-01), 1837-1864 1437-3254 104:7<1837 2015 104 531