Naslov
Sedimentary record of the submerged Late Quaternary paleoenvironments preserved in a silled karst basin (Lošinj Channel, Adriatic Sea)

Autori
Brunović, Dea ; Miko, Slobodan ; Hasan, Ozren ; Papatheodorou, George ; Ilijanić, Nikolina ; Geraga, Maria

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
6. Hrvatski geološki kongres s međunarodnim sudjelovanjem. Knjiga sažetaka/ 6. Croatian Geological Congress with international participation. Abstracts Book / Horvat, Marija ; Matoš, Bojan ; Wacha, Lara - Zagreb : Hrvatski geološki institut, 2019, 46-47

Skup
6. hrvatski geološki kongres s međunarodnim sudjelovanjem

Mjesto i datum
Zagreb, Hrvatska, 09.10.2019. - 12.10.2019

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Recenziran

Ključne riječi
paleoenvironments, Late Quaternary, Lošinj Channel, sediment cores, high-resolution seismics

Sažetak
Submerged paleoenvironments have become a popular topic among the scientific community due to their relevance for the interpretation of the future sea level and climate changes and the assessment of coastal flooding. Numerous present-day shelf seas were formed by marine transgression after the Last Glacial Maximum (LGM) and have transitioned from terrestrial to marine environment and vice versa multiple times during the Quaternary glacial- interglacial cycles. Adriatic sea was no exception. Here we present the results of a comprehensive research conducted in the submerged Lošinj Channel basin, located between the islands Cres and Lošinj in the northern part of the eastern Adriatic coast. Two sediment cores (LK-12, LK-15) were extracted and analyzed in detail. The combined measurements of magnetic susceptibility, grain size, mineralogy and geochemistry (XRF core scanning, total nitrogen, organic and inorganic carbon) were performed. Paleontological data and AMS 14C dating results enhanced interpretation of the obtained sediment core data. High-resolution seismic methods gave us an additional insight into the sedimentary infill of this nowadays submerged basin. Investigated sediment succession in the Lošinj Channel revealed significant paleoenvironmental changes in relation to the Lošinj Channel sill depth (-50 m) and the Late Quaternary sea level and climate changes. Our findings include the first detailed reconstruction of the presumed MIS 5a marine sediment sequence along the eastern Adriatic coast and the existence of an isolated MIS 3 paleolake („Lošinj paleolake“). During the LGM a typical karst feature (karst polje) was formed. A high resolution post-LGM sediment sequence was also investigated. During Allerød a brackish water lacustrine environment developed („Lošinj marine paleolake“) with the sea-water seepage through the karstified sill, while marine sedimentation started during Holocene (10.5 cal ka BP). Conducted research in Lošinj Channel offers a valuable new information for constraining the Late Quaternary paleoenvironmental and sea level changes along the eastern Adriatic coast. Due to the long time span (MIS 5-Holocene) of extracted sediment cores, the Lošinj Channel data are also significant on the wider regional scale.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Interdisciplinarne prirodne znanosti

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