HIGH RESOLUTION MINERALOGICAL CHARACTERIZATION OF SEDIMENTS - LAKE BOL?T?U-FEREDEU (ROMANIA)

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