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Pregled bibliografske jedinice broj: 638071

Časopis

Autori: Cukrov, Neven; Cuculić, Vlado; Barišić, Delko; Lojen, Sonja; Lovrenčić Mikelić, Ivanka; Oreščanin, Višnja; Vdović, Neda; Fiket, Željka; Čermelj, Branko; Mlakar, Marina
Naslov: Elemental and isotopic records in recent fluvio-lacustrine sediments in karstic river Krka, Croatia
Izvornik: Journal of geochemical exploration (0375-6742) 134 (2013); 51-60
Vrsta rada: članak
Ključne riječi: Karstic river; Metals; Stable isotopes; Organic matter; Tufa; Statistical evaluation
Sažetak:
A history of metal input and changes in the environmental conditions of the karst ecosystem of Krka River during the last several decades was investigated by statistical evaluation of combination of several proxies including sediment content of minor (Pb, Zn, Cu, As, Cr, Ni, Co, V, Ga, Y, Rb, Sr) and major (Ca, K, Fe, Mn, Ti, Al) elements, concentrations of sedimentary organic carbon (Corg) and nitrogen (N), their stable isotope compositions (δ13Corg and δ15N), as well as stable isotope composition of sedimentary carbonate (δ13Ccarb and δ18Ocarb). The results show that measured trace and major elements are predominately of terrigenous origin, reflecting the geological background of the area, whereas the sedimentary organic matter is predominantly authigenic. Although Zn amounts in sediments are result of anthropogenic pressures, its distribution in investigated sediment columns is influenced by natural processes, i.e. occasional re-sedimentation and self-purification of the water column caused by the particulate Zn deposition in lakes formed by the tufa barrages. Levels of Pb in sediment columns are low except in the K2 which is close to the crossroads, especially in the period of lead fuel use. Trace element concentrations in sediment columns are compared to consensusbased sediment quality guidelines (SQG) for freshwater ecosystems. Some of As, Zn and particularly Ni sediment concentrations were found to be above threshold effect concentration (TEC) range. The stable isotope of Corg and Corg/N ratios suggest that the sedimentary organic matter is predominately of algal and bacterial origin, while the carbonate is a mixture of terrigenic detritus and in-situ precipitates. Average grain size distribution and carbonate content of sediment indicate decreasing input of terrestrial non-carbonate fraction, as a consequence of afforestation and land use changes in studied area.
Projekt / tema: 098-0982934-2713, 098-0982934-2715, 098-0982934-2720
Izvorni jezik: ENG
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
Scopus
SCI-EXP, SSCI i/ili A&HCI
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
Geologija
URL Internet adrese: http://www.sciencedirect.com/science/article/pii/S0375674213001441
Broj citata:
Altmetric:
DOI: 10.1016/j.gexplo.2013.07.011
URL cjelovitog teksta:
Google Scholar: Elemental and isotopic records in recent fluvio-lacustrine sediments in karstic river Krka, Croatia
Upisao u CROSBI: Vlado Cuculić (Vlado.Cuculic@irb.hr), 21. Srp. 2013. u 11:55 sati



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