Clay minerals in lake sediments along the eastern Adriatic coast as proxies of environmental changes during late Pleistocene and Holocene

Ilijanić, Nikolina (2014) Clay minerals in lake sediments along the eastern Adriatic coast as proxies of environmental changes during late Pleistocene and Holocene. Doctoral thesis, Faculty of Science > Department of Geology.

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Abstract

Lake sediments are the result of the input material from the catchment and lake productivity. Changes in sedimentation can be caused by abrupt climate changes, as well as human activity. Lacustrine sediments, once buried on the bottom of the lake, are an ideal medium for the preservation of such changes. Paleolimnological recearch on lake sediments on the eastern Adriatic coast (Lake Vrana on the Island Cres, Bokanjačko blato, Lake Vrana near Biograd and Lake Baćina-Crniševo) enabled tracking paleoenvironmental conditions from the late Pleistocene until present. High sediment sampling resolution (1 cm) of the cores 440, 780, 1101 and 840 cm in length, respectively, and precise dating using AMS 14C has provided us insight into the depositional processes, sediment source, water column conditions and lake productivity, based on mineralogical, geochemical, grain size, playnological, magnetic susceptibility and color reflectance analysis. Lakes represent typical karst lakes, polje filled with water, and are dominated by carbonate sedimentation, with periodic siliciclastic input. Mineral composition is mainly determined by these processes and depends on the mineral composition of the catchment and the climatic factors, i.e. physical or chemical weathering. Clay minerals alone rarely provide primary evidence of climate change and the best approach is the multidisciplinary one where evidence from clays is compared with that from the palynological and geochemical data. The dissertation presents four lacustrine palaeoenvironmental reconstructions that show evidence for Holocene climate changes associated with Mediterraenan climayte dynamics and Adriatic Sea level changes.

Item Type: Thesis (Doctoral thesis)
Keywords: lake sediments, clay minerals, geochemistry, Holocene, eastern Adriatic coast
Supervisor: Miko, Slobodan and Tibljaš, Darko
Date: 2014
Number of Pages: 382
Subjects: NATURAL SCIENCES > Geology
Divisions: Faculty of Science > Department of Geology
Depositing User: Sonja Borak
Date Deposited: 22 Apr 2014 11:10
Last Modified: 05 May 2014 07:55
URI: http://digre.pmf.unizg.hr/id/eprint/894

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