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The Late Quaternary palaeoenvironmental development of Lošinj Channel, Adriatic Sea

High-resolution geophysical study was conducted in order to gain knowledge of the subsurface sediment distribution and to determine coring locations. This method enabled penetration into the topmost 40-50 m of sediment column. Six main seismic units were recognized on high- resolution seismic profiles (Figure 1) that imply exchange of lacustrine and marine depositional environments, intermitted with erosional surfaces, in the study area during the Late Quaternary. Moreover, a total of eight sediment cores were extracted from the water depth range of 5 to 64 m. Sediment core data further supported geophysical data and enabled detailed palaeoenvironmental reconstruction of the study area from MIS 3 stage to Holocene. Large areas of now submerged landscape were formerly exposed during the glacial low sea- levels (Late MIS 3 and MIS 2). In these periods, Lošinj Channel was isolated karst basin separated by a sill from Kvarnerić Bay and terrestrial environments (karst lake and karst polje) developed. During the interglacials, sea-level was high enough to inundate investigated area. Consequently, this karst depression became repository of successive terrestrial, lacustrine, brackish and marine sediments, offering rich and detailed archive of environmental history in the region.

Pleistocene, Holocene, marine sediments, MIS-2, LGM, foraminifera, karst, Lošinjski channel, Adriatic sea

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