engleski

Investigations into Quaternary Deposits in the Souther part of Kvarner Bay in the Northern Adriatic

Quaternary sediments in the northern Adriatic are interpreted on the basis of the investigations into the key section on Susak Island siutated in the southern part of Kvarner Bay. Our studies were extended to a time period of the past 5 million years. During most of the last one million year the surrounding area was part of the continent as the sea regressed from its northern basin. The later was filled up with sediments by Po River and its tributaries. Winds had blown out fine grained material of these muddy and sandy deposits and transported it to the island. From the falling dust loess was formed in a thickness of 50-98 m. For a deeper understanding of the Susak layers the traditional sedimentological parameters (K, Sk, So, Md) were studied together with granulometric parameters newly introduced in Hungary: FG (fineness grade) adopted from Germany and Kd index (degree of weathering) adopted from China. Parameter values can be read from the profile below. In the course of data interpretation a wealth of information could be obtained on climate changes during the past two million years: extremes of warming and coolin by layers were fixed, lithological units, periods of and gaps in sedimentation identified, boundaries of layers drawn, in situ and redeposited sediments distinguished, circumstances of formation cleard up. Usin the above methods 31 horizons were identified along the Susak 1997 profile: 11 paleosol layers, 4 sand layers, 13 layers of loess nad loess-like deposits and 3 tephra horizons. The newly applied parameters should be instrumental in environmental reconstructions.

loess; sedimentological parameters; fineness grade; degree of weathering

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