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The Sárrét marshland is situated along the northeastern foothills of the Bakony Mountains, along a NE-SW-trending neotectonic zone. Investigation of the marshland and the reconstruction of its evolution are especially interesting to compare to the present and the expected future stage of Lakes Balaton and Velence. Based on the sedimentological characteristics of the core sequence and the geochemical, physical, and mineralogical composition of the layers, three sedimentological cycles could be separated. The three cycles represent the most important evolutionary phases of lake formation: flourishing and progressive aging. First, a nutrient-poor, open-water lake existed, where clastic sediments (sand and silty clay) were deposited. During the second phase, phytoplankton-produced autogenic lime mud was deposited in the progressively more eutrophic water. Peat accumulation during the third stage indicates the marsh phase of the lake.The results suggest that the studied sequence developed from Late Glacial to Middle Holocene. According to radiocarbon dating the accumulation rate in Sárrét (Sümegi, this volume) corresponds to the sedimentation rates in the Tapolca Basin and Lake Balaton.

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. Hydrography of the Lake Balaton (in Hungarian) 1918 Cserny T, Nagy-Bodor E 2000: Limnogeology of Lake Balaton, Hungary. In: E H Gierlowski

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környezetföldtana CD (Environmental geology of the shore of Lake Balaton). Cserny, T, E. Nagy-Bodor 2000: Limnogeology of Lake Balaton. - In: E.H. Gierlowski-Kordesch, K.R. Kelts (Eds): Lake

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213 Cserny, T., E. Nagy-Bodor 2000: Limnogeology of Lake Balaton (Hungary). — In: Gierlowski-Kordesch, E.H., K. R. Kelts (Eds): Lake Basins Through Space and Time. AAPG Studies in Geology, 46

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