International Geological Journal - Official Journal of the Carpathian-Balkan Geological Association

NORTH DINARIDIC LATE CRETACEOUS-PALEOGENE SUBDUCTION-RELATED TECTONOSTRATIGRAPHIC UNITS OF THE SOUTHERN TISIA, CROATIA

Pages: 341 - 350

Authors: JAKOB PAMIC

Abstract: In order to evaluate the structural position of Mesozoic formations underlying the Neogene South Pannonian Basin, a tentative correlation is proposed between (1) the Late Cretaceous-Paleogene subduction-related magmatic, sedimentary and metamorphic units of the North Dinarides and (2) the apparently exotic blocks of the same units found in the subsurface and at the surface within the Pannonian Basin. The formations are as follows: a — Sedimentary Late Cretaceous to Paleogene flysch sequences, at their base interlayered with basalt, alkali-feldspar rhyolite and pyroclastics and intruded by penecontemporaneous A-type granites; b — Very low-, low- and medium-grade regionally metamorphosed sequences which originated from the surrounding Late Cretaceous-Paleogene rocks; c — Synkinematic Eocene A-type and S-type granitoids and d — Underlying tectonized ophiolite melange. Concordant radiometric (71 to 48 Ma) and geological ages were obtained on the rocks of the first three units from both areas. This paper presents diagrams which schematically illustrate and summarize the Late Cretaceous to Miocene evolution of the area adjoining the North Dinarides and South Pannonian Basin. Geological profiles, based on seismic data, are presented. The occurrence of North Dinaridic Late Cretaceous-Paleogene subduction-related exotic fragments found in the South Pannonian Basin can be explained: 1 — by Oligocene uplift of detached fragments of the underthrust North Dinarides in the nascent Drava and Sava depressions, and 2 — by Pliocene strike-slip faulting.

Keywords: North Dinarides, South Pannonian Basin, flysch sequences, Alpine metamorphic sequences, synkinematic granitoids, ophiolite melange, correlation

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