Pre-Alpine evolution of a segment of the North-Gondwanan margin: Geochronological and geochemical evidence from the central Serbo-Macedonian Massif |
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| Institution: | 1. Institute for Geology and Palaeontology, Basel University, 4056 Basel, Switzerland;2. Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;3. Institute of Geochemistry and Petrology, ETH-Zürich, 8092 Zürich, Switzerland;4. Faculty of Mining and Geology, University of Belgrade, 11000 Belgrade, Serbia;5. Faculty of Natural and Technical Sciences, University “Goce Delčev”, 2000 Štip, Republic of Macedonia;6. Faculty of Geology and Geography, University “St. Kl. Ohridski”, 1504 Sofia, Bulgaria;1. Institute of Geology, Czech Academy of Sciences, v.v.i., Rozvojová 269, CZ-165 02 Prague 6, Czech Republic;2. Brno University of Technology, Faculty of Civil Engineering, AdMaS Centre, Veveří 95, CZ-602 00 Brno, Czech Republic;3. Deutsches GeoForschungsZentrum GFZ, Telegrafenberg D-14473, Potsdam, Germany;4. Geocycles Research Centre, Institute of Geosciences, University of Mainz, Becherweg 21, D-55099 Mainz, Germany;5. Faculty of Mining and Geology, University of Belgrade, Djušina 7, RS-11000 Belgrade, Serbia;1. Géosciences Rennes, UMR CNRS 6118, Université Rennes 1, OSUR, 35042 Rennes, France;2. Géosciences Montpellier, UMR 5243 CNRS, Université Montpellier2, place E. Bataillon, 34095 Montpellier, France;3. National Technical University of Athens, School of Mining and Metallurgical Engineering, Department of Geological Sciences, Laboratory of Mineralogy, Petrology and Economic Geology, Greece;1. Institute of Geology of the Czech Academy of Sciences, Rozvojová 269, CZ-165 02 Prague, 6, Czech Republic;2. Brno University of Technology, Faculty of Civil Engineering, Institute of Geotechnics, Veveří 95, CZ-602 00 Brno, Czech Republic;3. Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic;4. Deutsches GeoForschungsZentrum GFZ, Telegrafenberg, D-144 73, Potsdam, Germany |
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| Abstract: | The Serbo-Macedonian Massif (SMM) represents a composite crystalline belt within the Eastern European Alpine orogen, outcropping from the Pannonian basin in the north, to the Aegean Sea in the south. The central parts of the massif (i.e. southeastern Serbia, southwestern Bulgaria, eastern Macedonia) consist of the medium- to high-grade Lower Complex, and the low-grade Vlasina Unit. New results of U–Pb LA-ICP-MS analyses, coupled with geochemical analyses of Hf isotopes on magmatic and detrital zircons, and main and trace element concentrations in whole-rock samples suggest that the central SMM and the basement of the adjacent units (i.e. Eastern Veles series and Struma Unit) originated in the central parts of the northern margin of Gondwana. These data provided a basis for a revised tectonic model of the evolution of the SMM from the late Ediacaran to the Early Triassic.The earliest magmatism in the Lower Complex, Vlasina Unit and the basement of Struma Unit is related to the activity along the late Cadomian magmatic arc (562–522 Ma). Subsequent stage of early Palaeozoic igneous activity is associated with the reactivation of subduction below the Lower Complex and the Eastern Veles series during the Early Ordovician (490–478 Ma), emplacement of mafic dykes in the Lower Complex due to aborted rifting in the Middle Ordovician (472–456 Ma), and felsic within-plate magmatism in the early Silurian (439 ± 2 Ma). The third magmatic stage is represented by Carboniferous late to post-collisional granites (328–304 Ma). These granites intrude the gneisses of the Lower Complex, in which the youngest deformed igneous rocks are of early Silurian age, thus constraining the high-strain deformation and peak metamorphism to the Variscan orogeny. The Permian–Triassic (255–253 Ma) stage of late- to post-collisional and within-plate felsic magmatism is related to the opening of the Mesozoic Tethys. |
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