HIGH RESOLUTION MINERALOGICAL CHARACTERIZATION OF SEDIMENTS - LAKE BOLĂTĂU-FEREDEU (ROMANIA), Carpathian Journal of Earth and Environmental Sciences, February 2021, Vol. 16, No. 1, p. 199 – 210; DOI:10.26471/cjees/2021/016/167 - Carpathian Journal of Earth And Environmental Sciences

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Máté Karlik^1,2,4, Ildikó GYOLLAI², Anna VANCSIK^3,5, Krisztián FINTOR4, Zoltán SZALAI^3,5, Marcel MÎNDRESCU⁶, Ionela GRĂDINARU⁶, Sándor VÁGÁSI⁷, Gábor BOZSÓ⁴, Márta POLGÁRI^2,8, Elemér PÁL-MOLNÁR⁴

¹Isotope Climatology and Environmental Research Centre, Institute for Nuclear Research, H-4026 Bem tér 18/c Debrecen, Hungary, karlikmate@gmail.com

²Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, ELKH, Budapest. Hungary

³Geographical Institute, Research Centre for Astronomy and Earth Sciences, Budapest, Hungary

⁴Department of Mineralogy, Geochemistry and Petrology, University of Szeged, Szeged, Hungary

⁵Department of Environmental and Landscape Geography, Eötvös Loránd University, Budapest, Hungary

⁶Department of Geography, Ștefan cel Mare University, Suceava, Romania

⁷Copenhagen, Denmark

8Eszterházy Károly University, Dept. of Natural Geography and Geoinformatics, Eger, Hungary

HIGH RESOLUTION MINERALOGICAL CHARACTERIZATION OF SEDIMENTS - LAKE BOLĂTĂU-FEREDEU (ROMANIA), Carpathian Journal of Earth and Environmental Sciences, February 2021, Vol. 16, No. 1, p. 199 – 210; DOI:10.26471/cjees/2021/016/167

Full text

The catchment (bedrock and soil) and sediments of lake Bolătău, Romania were studied by high resolution multi-methodological investigations to characterize paleoenvironmental and formation conditions. Particle size analyses, optical and cathodoluminescence microscopy, FTIR-ATR and Raman spectroscopy, X-ray powder diffraction, and XRF were applied for microtextural, chemical, micro-mineralogical and embedded organic material characterization and distribution of the sediments, especially concerning geochemical conditions, like pH and redox potential change. Our results support physical and chemical weathering in the process of soil formation with appearance of the new minerals appear (10Å sized phyllosilicates and clay minerals). Comparison of these studies offer possible differentiation of syn- and diagenetic mineralization, the clarification of debris contribution, microbial mediation and complex mineralization via decomposition of cell and extracellular polymeric substance. Based on the analyses on the abrasives, a suboxic environment prevailed in the depositional area and considerable microbial contribution is proposed via accumulation of lake sediments.