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You are here: Home » Latest Issue » Volume 16, 2021 - Number 1 » 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


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Máté Karlik1,2,4, Ildikó GYOLLAI2, Anna VANCSIK3,5, Krisztián FINTOR4, Zoltán SZALAI3,5, Marcel MÎNDRESCU6, Ionela GRĂDINARU6, Sándor VÁGÁSI7, Gábor BOZSÓ4, Márta POLGÁRI2,8, 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

Abstract:

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.



Keyword: lake sediment, high resolution analysis, mineralized biosignatures, biomineralization


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