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Geodynamic evolution of the Central Dinarides.

The Central part of Dinarides, unlike the northwestern and southeastern Dinarides, shows a consistent pattern in the distribution of the large tectonostratigraphic units. From southwest (Apulia) to northeast, the following five main units originating in different parts of the Mesozoic Tethys, can be distinguished: (1) Adriatic-Dinaridic carbonate platform formations ; (2) carbonate-clastic units ("flysch bosniaque") of the passive continental margin ; (3) ophiolite-bearing formations of the Dinaridic Ophiolite Tone, also containing radiolarites, greywackes and shales, including melange formations, and overstepped Late Jurassic to Cretaceous cover sequences ; (4) active continental margin units represented by Upper Cretaceous_Palaeogene trench sediments with blueschists, tectonized ophiolite melange, Alpine medium-pressure metamorphic rocks originated from Upper Cretaceous-Palaeogene sediments, and Alpine synkinematic granitoids ; (5) a nappe consisting of allochthonous Palaeozoic-Triassic formations which is thrust onto the ophiolites and geneticaly related sedimentary formations. The evolution of the Central Dinarides was controlled by a sequence of tectonic events which took place within the Alpine cycle: (1) Rifting processes wwhich started in the Late Permian an ended in the Norian. (2) Opening of the oceanic Dinaridic tethys commenced in the Late Triassic and persisted for some 70-80 Ma until the end of the Jurassic. (3) Subduction processes and emplacement of ophiolites started in Late Jurassic-Early Cretaceous times ; during the closing phase of the "Dinaridic Ocean" (or Dinaridic Tethys) the Palaeozoic-Triassic nappe was emplaced on the ophiolites. The thrusting was accompanied by Alpine metamorphism (120-100 Ma). (4) The Main Alpine deformational event and medium-pressure matamorphism with synkinematic granite plutonism took place in Late Eocene-Early Oligocene times.

Tectonostratigraphic units; Dinaridic Tethys; rifting; opening; subduction

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