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Geologia Croatica, Vol. 73 No. 3, 2020.

Original scientific paper

https://doi.org/10.4154/gc.2020.15

Paleoecological and sedimentological characterisation of Middle Miocene sediments from the Hrvatska Kostajnica area (Croatia)

Anita Grizelj orcid id orcid.org/0000-0001-5230-4725 ; Croatian Geological Survey, Zagreb
Monika Milošević ; Croatian Geological Survey, Zagreb
Koraljka Bakrač orcid id orcid.org/0000-0002-2520-411X ; Croatian Geological Survey, Zagreb
Ines Galović orcid id orcid.org/0000-0002-1359-2282 ; Croatian Geological Survey, Zagreb
Tomislav Kurečić ; Croatian Geological Survey, Zagreb
Valentina Hajek-Tadesse orcid id orcid.org/0000-0002-3396-7897 ; Croatian Geological Survey, Zagreb
Radovan Avanić ; Croatian Geological Survey, Zagreb
Mirjana Miknić ; retired
Marija Horvat ; Croatian Geological Survey, Zagreb
Ana Čaić Janković ; Croatian Geological Survey, Zagreb
Mario Matošević orcid id orcid.org/0000-0001-5220-2200 ; INA – Industrija nafte d.d, Exploration & Production, Exploration & Upstream Portfolio Development, Rock & Fluid Analysis, Zagreb

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Abstract

The Miocene deposits of the Hrvatska Kostajnica (KOS-I) area belong to the south-western marginal part of the Pannonian Basin System (PBS). Investigation of the lithostratigraphical column included: mineralogical, geochemical, sedimentological and integrated palaeontological (calcareous nannofossil, foraminifers, ostracodes, palynomorphs) analyses. Badenian and Sarmatian sediments of this column were deposited in a marine offshore environment with local input of terrigenous material represented by marls and silty marls. Based on palaeontological data, the recorded palaeoclimate was subtropical in the late Badenian changing to a warm temperate climate of the early Sarmatian. Marly sediments predominantly consist of carbonate (calcite and aragonite) and clay minerals, while quartz and plagioclase are less abundant. Most samples contain a small amount of zeolite minerals from the clinoptilolite/heulandite series. Among the clay minerals, smectite and illite/muscovite are the most abundant. Based on provenance analyses we concluded that the Badenian-Sarmatian marls were predominantly formed by the weathering of acidic (Si-rich) source rock derived material from the neighbouring Inner Dinarides.

Keywords

Pannonian Basin System; Hrvatska Kostajnica area; Badenian; Sarmatian; Microfossils; Pelitic sedimentary rocks; Provenance

Hrčak ID:

246371

URI

https://hrcak.srce.hr/246371

Publication date:

26.10.2020.

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