Paleogene–early Miocene igneous rocks and geodynamics of the Alpine-Carpathian-Pannonian-Dinaric region: An integrated approach

Abstract

A review of Paleogene-early Miocene igneous rocks of the Alpine-Carpathian-Pannonian -Dinaric region is presented in this paper. We attempt to reveal the geodynamic link between Paleogene-early Miocene igneous rocks of the Mid-Hungarian zone and those of the Alps and Dinarides. Our summary suggests that Paleogene-early Miocene igneous rocks of all these areas were formed along a single, subduction-related magmatic arc. The study also highlights orthopyroxene-rich websterite mantle xenoliths from west Hungary and east Serbia that were formed in the vicinity of a subducted slab. We discuss the location and polarity of all potential subduction zones of the area that may account for the igneous rocks and orthopyroxene-rich mantle rocks. However, results of seismic tomography on subducted slabs beneath the studied area combined with geological data demonstrate that igneous rocks and mantle rocks cannot be explained by the same subduction process. We propose that the Paleogene-early Miocene arc was mainly generated by the Budva-Pindos subduction zone, subordinately by Penninic subduction, whereas mantle rocks were possibly formed in the vicinity of the older Vardar subduction zone. Continental blocks possibly moved together with their mantle lithosphere. The present diverging shape of the proposed arc has been achieved by considerable shear and rotations of those lithospheric blocks.

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

“…The group of Oligocene intrusions within the investigated area (Kopaonik, Drenje Ž eljin) is part of a NW-SE striking alignment of granitoids that follows the inner Dinarides (Sava-Vardar Belt or Zone of Pamić et al 2002a andKovács et al 2007, respectively) from northern Bosnia (Motajica intrusion, Ustaszewski et al in press) all the way to southern Serbia (Fig. 9).…”

“…Cvetković et al 2004a), (2) Back-arc magmatism in relation to a more externally located subduction zone, with or without slab break-off of the Adriatic plate (e.g. Pamić et al 2002a;Kovács et al 2007), and/or, (3) Slab delamination (Bird 1979) caused by roll-back ) of the former lower plate after collision, associated with foreland migration of thrusting within the external Dinarides. We exclude scenario (1) in view of the fact that compression in the Dinarides did not come to a halt after collision across the Sava Zone.…”

“…At closer inspection, three such linear zones can be distinguished ( Fig. 1 and Kovács et al 2007): (1) a belt that follows the Periadriatic line delimiting the Southern Alps from the rest of the Alps (Periadriatic intrusions s.str. ; e.g.…”

“…'Miocene' and 'pre-Miocene' zircon ages are unpublished data from Int J Earth Sci (Geol Rundsch) Paleogene Periadriatic intrusions of the Alps (Periadriatic intrusions s.str.) can be followed into the Mid-Hungarian fault zone and/or into the internal Dinarides and whether these intrusions represent the back-arc magmatism with respect to only one or two different subduction zones (Kovács et al 2007), or alternatively, whether they are related to post-orogenic collapse of an overthickened crust in the internal Dinarides (Koroneos et al 2010), mantle delamination and/or to extension in the Pannonian basin (e.g. Cvetković et al 2007a).…”

AlpArray in Hungary: temporary and permanent seismological networks in the transition zone between the Eastern Alps and the Pannonian basin

“…are only present in the crust or could be traced down all the way to the asthenosphere, cross-cutting the entire continental lithospheric mantle (c.f. Tari et al 1999;Horváth et al 2015;Kovács et al 2007Kovács et al , 2012. This challenging topic could be resolved if horizontal heterogeneities are mapped in the lithosphere as tectonic units are likely expected to show coherent images if separated by deep fault zones (i.e.…”