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25 years of systematic paleomagnetic investigations of coastal Dinarides (Croatia) or How does paleomagnetism help to understand the evolution of External (Karst) Dinarides?

The Dinarides, southwest vergent foreland fold and thrust belt, located on the convergent boundary separating the Adriatic and Tisza-Dacia microplates, are composed of several geotectonic units. The External (Karst) Dinarides, exposed along the eastern Adriatic coast, are composed of a thick section of Late Paleozoic to Eocene shallow- to deep-water carbonates and clastics. Their complex internal structure and complex relationship with adjacent regions/units (like undeformed Adria) still are waiting to be completely understood. The systematic paleomagnetic investigations coupled with biostratigraphical studies conducted for the last 25 years (Márton et al., 2003 ; 2008 ; 2010a, b ; 2014 ; Márton & Moro, 2009) resulted in data which bring more light on their geodynamic evolution. Investigations have been conducted on the Jurassic, Cretaceous, and Eocene sediments from the north-west part (Istria), Gorski kotar region, Velebit Mt. ; several North Adriatic islands ; and further to the south to the Central Dalmatian islands. Some of the conclusions are: 1) close coordination from the late Albian onward for the Adriatic islands, although some tectonic models place investigated islands within different tectonic units ; 2) coeval paleomagnetic directions for the Adriatic islands and for “autochthonous“ Adria are co-incident from the late Albian onward ; and 3) the Northern Adriatic mainland rotated about 30° CW with respect to Adria (the timing of the rotation is not yet solved). References: Márton, E., Drobne, K., Ćosović, V. & Moro, A., 2003: Palaeomagnetic evidence for Tertiary counterclockwise rotation of Adria. Tectonophysics, vol. 377 (1-2), p. 143-156. Márton, E., Ćosović, V., Moro, A. & Zvocak, S., 2008: The motion of Adria during the Late Jurassic and Cretaceous: New paleomagnetic results from stable Istria. Tectonophysics, vol. 454 (1-4), p. 44-53. Márton, E. & Moro, A., 2009: New palaeomagnetic results from imbricated Adria: Ist island and related areas. Geologia Croatica, vol. 62 (2), p. 107-114. Márton, E., Ćosović, V., Bucković, D. & Moro, A., 2010a: The tectonic development of the Northern Adriatic region constrained by Jurassic and Cretaceous paleomagnetic results. Tectonophysics, vol. 490 (1-2), p. 93-102. Márton, E., Zampieri, D., Grandesso, P., Ćosović, V. & Moro, A., 2010b: New Cretaceous paleomagnetic results from the foreland of the Southern Alps and the refined apparent polar wander path for stable Adria. Tectonophysics, vol. 480 (1-4), p. 57-72. Márton, E., Ćosović, V. & Moro, A., 2014: New stepping stones, Dugi otok and Vis islands, in the systematic paleomagnetic study of the Adriatic region and their significance in evaluations of existing tectonic models. Tectonophysics, vol. 611, p. 141-154.

Coastal Dinarides; Adria microplate; Paleomagnetism

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