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Glacioistostatic rebound of External Dinarides (CROSBI ID 479060)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Marjanac, Tihomir ; Marjanac, Ljerka Glacioistostatic rebound of External Dinarides // Pancardi 2000 Abstracts / Tomljenović, B. ; Balen, D. ; Saftić, B. (ur.). Zagreb, 2000. str. 77-78-x

Podaci o odgovornosti

Marjanac, Tihomir ; Marjanac, Ljerka

engleski

Glacioistostatic rebound of External Dinarides

Pleistocene ice cover of the External Dinarides extended to the present day sea level (MARJANAC et al., 1990; MARJANAC & MARJANAC, 1991a), what implies that the mountains were covered by ice during glacial maximum. Velly glaciers were fed from cirques and small ice caps which covered mountain ranges like Mt. Kapela, Velebit and Bosnian mountains. The thickness of ice caps is still a subject of debate, but we estimate a minimal thickness of ca 500 m after relief forms on the Velebit Mt. range. Deglaciation of external Dinarides was followed by variable glacio-isostatic rebound and neotectonical movements. The evidence is as follows (numbers refer to localitites shown on the map (Fig. 1) and meters refer to present day position above sea level): A) uplifted Pleistocene shallow-marine sediments on the Krk island near Šilo (#1, >45m) (MARJANAC et al., 1992/93) and Baška (#2, >5m) (MARJANAC & MARJANAC, 1991b), on the Ist island (#5, >10m), in the Sinj valley (#7, >300m) (JURIŠIĆ-POLŠAK et al., 1992) and on the Hvar island (#8, >20m). B) uplifted litophagal borings on the Prvić island (#3, >4m) and Korčula island (#9, >2m). C) uplifted abrasion terrace near Metajna on the Pag island (#4, >10m) D) normal faulting in Pleistocene marsh and lake sediments of Strmica near Knin (#6) (KASTMÜLLER, 1989) The magnitude of uplift presented is minimal because the sediments were eroded by younger alluvial deposits like in Baška on Krk island, and form erosional remnants at localities Krk-Šilo, Krk-Baška, Ist, Hvar, Prvić and Korčula. The age of uplifted Pleistocene sediments is determined as Early Pleistocene (Krk-Baška), Late Pleistocene (Krk-Šilo, Ist) and Middle-Late Pleistocene (Sinj), what indicates that the uplift postdated the Late Pleistocene. As regards the magnitude of uplift, it is apparent that it increases towards the mountainous hinterland, what reflects elastic lithosphere rebound. The consequence of rebound of this order of magnitude, must have been local faulting - which is actually recognized in Strmica near Knin (KASTMÜLLER, 1989). This (post glacial) neotectonics could have affected courses of rivers, and a good candidate is the Zrmanja river (#10). FRITZ (1972) found evidence of Zrmanja’s Pleistocene course which flew eastwards towards the Krka river (#11), but later changed its course towards west to enter the Adriatic sea, what he attributed to thrust tectonics. Conclusion The evidence of the Late Pleistocene (post glacial) uplift, as described herein, indicate that the External Dinarides were subjected to glacioisostatic elestic rebound. The amount of uplift increases inland, and eventually caused the change in Zrmanja river course. The uplift (rebound) scale suggests that the ice cover was thick enough to create significant deflection of the lithosphere which was restrained during deglacitation. We believe that elastic litosphere rebound initiated neotectonical faulting and it should be taken into consideration when interpreting geological history of the Dinarides. References Fritz F. (1972): Razvitak gornjeg toka rijeke Zrmanje. Krš. Jugosl. 8/1, 1-16, Zagreb. Jurišić-Polšak Z., Bajraktarević Z. & Bahun S. (1992): Spiridon Brusina’s Miocene Freshwater and Pleistocene Marine Fossils from Sinjsko Polje. - Natura Croat. 1, 19-26, Zagreb. Kastmüller Ž. (1989): Geološki i paleontološki odnosi donjopleistocenskih naslaga u Strmici sjeverno od Knina. Msc Thesis, University of Zagreb, 53 p. Marjanac Lj., Poje M. & Marjanac T. (1992/93): Pleistocene marine and terrestrial sediments with striata fauna on the Island of Krk. - Rad Hrv. akad. znan. umjet. Razr. prir. znan. 26 (463), 49-62, Zagreb. Marjanac Lj. & Marjanac T. (1991b): Pleistocene alluvial deposits on the Krk island (Northern Adriatic). Abstracts IAS 12. Reg. Mtg. Bergen, 31. Marjanac T., Marjanac Lj. & Oreški E. (1990): Glacijalni i periglacijalni sedimenti u Novigradskom moru. - Geol. vjesnik 43, 35-42, Zagreb. Marjanac T. & Marjanac Lj. (1991a): Pleistocene glacial and periglacial deposits on Middle Adriatic coast. Abstracts IAS 12. Regional Meeting, Bergen, 32.

Glacioisostacy; Quaternary; Dinarides

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Podaci o prilogu

77-78-x.

2000.

objavljeno

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Pancardi 2000 Abstracts

Tomljenović, B. ; Balen, D. ; Saftić, B.

Zagreb:

Podaci o skupu

PANCARDI 2000

predavanje

01.10.2000-03.10.2000

Dubrovnik, Hrvatska

Povezanost rada

Geologija