Sedimentological and geochemical caracteristics of recent sediments from lake Kuti (Neretva river delta)

Grozić, Dino (2015) Sedimentological and geochemical caracteristics of recent sediments from lake Kuti (Neretva river delta). Diploma thesis, Faculty of Science > Department of Geology.

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Abstract

Sediments from the lake Kuti, a freshwater lake belonging to the Neretva river delta were analyzed in terms of sedimentological, mineralogical and geochemical traits. Sediment characteristics were determined by laser diffraction (LD), x-ray powder diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high resolution inductively coupled plasma-mass spectrometry (HR-ICPMS) and energy-dispersive x-ray spectroscopy (EDX). The results obtained show that the lake Kuti is a unique semi-closed carbonate sedimentation system characterized by the calcite precipitation as a dominant process and low terrigenous input. Morphological and structural features of calcite, especially its occurrence in mesocrystal forms, exemplify the role of biologically induced inorganic precipitation processes in the formation of the recent calcite mud. Pyrite was also determined as an important constituent in mineral composition of the investigated sediments. Euhedral forms of investigated pyrite, along with the Mn, Mo and U distribution in the sediment, points to occasional euxinic/anoxic sedimentation conditions, while growing trend of organic matter accumulation observed in deeper parts of the lake suggests eutrophication process in recent lake history. According to toxicological guidelines for sediment quality in freshwater ecosystems, lake Kuti cannot be considered polluted by heavy metals, although the growing trend of Sn concentrations in top sediment layers indicate recent anthropogenic influence in shallow parts of the lake.

Item Type: Thesis (Diploma thesis)
Keywords: autigenic minerals, carbonate sediments, lake Kuti, trace elements
Supervisor: Juračić, Mladen and Sondi, Ivan
Date: 2015
Number of Pages: 66
Subjects: NATURAL SCIENCES > Geology > Mineralogy and Petrology
Divisions: Faculty of Science > Department of Geology
Depositing User: Danica Vujičić
Date Deposited: 13 May 2015 20:07
Last Modified: 13 May 2015 20:07
URI: http://digre.pmf.unizg.hr/id/eprint/3720

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