Cenozoic granitoids in the Dinarides of southern Serbia: age of intrusion,isotope geochemistry,exhumation history and significance for the geodynamic evolution of the Balkan Peninsula |
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| Authors: | Senecio Schefer Vladica Cvetkovi? Bernhard Fügenschuh Alexandre Kounov Maria Ovtcharova Urs Schaltegger Stefan M Schmid |
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| Institution: | 1.Geologisch-Pal?ontologisches Institut,Basel,Switzerland;2.Univerzitet u Beogradu, Rudarsko Geolo?ki Fakultet,Beograd,Republic of Serbia;3.Institut für Geologie und Pal?ontologie,Innsbruck,Austria;4.Section des sciences de la Terre et de l’environnement,Geneva,Switzerland;5.Institut für Geologische Wissenschaften,Berlin,Germany |
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| Abstract: | Two age groups were determined for the Cenozoic granitoids in the Dinarides of southern Serbia by high-precision single grain
U–Pb dating of thermally annealed and chemically abraded zircons: (1) Oligocene ages (Kopaonik, Drenje, Željin) ranging from
31.7 to 30.6 Ma (2) Miocene ages (Golija and Polumir) at 20.58–20.17 and 18.06–17.74 Ma, respectively. Apatite fission-track
central ages, modelling combined with zircon central ages and additionally, local structural observations constrain the subsequent
exhumation history of the magmatic rocks. They indicate rapid cooling from above 300°C to ca. 80°C between 16 and 10 Ma for
both age groups, induced by extensional exhumation of the plutons located in the footwall of core complexes. Hence, Miocene
magmatism and core-complex formation not only affected the Pannonian basin but also a part of the mountainous areas of the
internal Dinarides. Based on an extensive set of existing age data combined with our own analyses, we propose a geodynamical
model for the Balkan Peninsula: The Late Eocene to Oligocene magmatism, which affects the Adria-derived lower plate units
of the internal Dinarides, was caused by delamination of the Adriatic mantle from the overlying crust, associated with post-collisional
convergence that propagated outward into the external Dinarides. Miocene magmatism, on the other hand, is associated with
core-complex formation along the southern margin of the Pannonian basin, probably associated with the W-directed subduction
of the European lithosphere beneath the Carpathians and interfering with ongoing Dinaridic–Hellenic back-arc extension. |
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