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Pregled bibliografske jedinice broj: 868672

Mineralogical, organic and isotopic composition as palaeoenvironmental records in the lake sediments of two lakes, the Plitvice Lakes, Croatia


Horvatinčić, Nada; Sironić, Andreja; Barešić, Jadranka; Sondi, Ivan; Krajcar Bronić, Ines; Borković, Damir
Mineralogical, organic and isotopic composition as palaeoenvironmental records in the lake sediments of two lakes, the Plitvice Lakes, Croatia // Quaternary international, 494 (2018), 300-313 doi:10.1016/j.quaint.2017.01.022 (međunarodna recenzija, članak, znanstveni)


Naslov
Mineralogical, organic and isotopic composition as palaeoenvironmental records in the lake sediments of two lakes, the Plitvice Lakes, Croatia

Autori
Horvatinčić, Nada ; Sironić, Andreja ; Barešić, Jadranka ; Sondi, Ivan ; Krajcar Bronić, Ines ; Borković, Damir

Izvornik
Quaternary international (1040-6182) 494 (2018); 300-313

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Lake sediments ; carbon isotope analyses ; C/N analyses ; mineral composition ; Plitvice Lakes ; Croatia

Sažetak
Six sediment cores, the top 30–40 cm, from two lakes of different sizes, Lake Prošće and Lake Kaluđerovac, situated in the karst region of the Plitvice Lakes system, Croatia, were studied by mineralogical and structural, C/N and total organic carbon (TOC) and isotopic analyses (a14C and δ13C of carbonate and organic fractions). The study of the two karst lakes where sediment composition is mainly calcite, showed that organic matter (OM) also plays an important role, and that both fractions analysed simultaneously give a good overview of the processes in the lakes. The morphological and structural properties of the calcite particles at micron and submicron levels indicate that the calcite mineral phase is formed by active authigenic precipitation in the studied lake systems. In the small Lake Kaluđerovac, the measured distributions of carbonate and OM fractions, C/N, TOC, and a14C and δ13C values of both fractions along the sediment depth showed similar values for all three cores, with small variations in each core indicating very homogenous precipitation of autochthonous calcite inside the lake, without allochthonous fraction. In the bigger Lake Prošće, the large difference in sediment composition of the three cores indicated different conditions of sediment precipitation inside the lake. Significant fractions of land- derived carbonate and OM were recognized by mineralogical, C/N, a14C and δ13C values in the shallow, coastal area indicating that the sediment was a mixture of allochthonous and autochthonous fractions. In contrast, the composition of the deep-water sediment in the same lake indicated in- situ calcite precipitation and aquatic OM produced in the lake. Sedimentation rates of 0.7 cm/yr and from 0.3 to 0.7 cm/yr for Lake Prošće and Lake Kaluđerovac, respectively, were determined based on the a14C of macrofossils. Extreme hydrological events in 1981 and 2010 were identified by disturbances in carbon isotopes distributions in sediment profiles. No evidence of anthropogenic influence in either lake on the local level was found, but the response to the global 14C contamination was observed by a14C peaks in both, carbonate and organic fractions. Increased bioproductivity in the recent decades was observed in Lake Prošće which can be correlated with a slight increase in lake water temperature in the last three decades. This process can be associated with enhanced eutrophication in Lake Prošće.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija, Interdisciplinarne prirodne znanosti



POVEZANOST RADA


Projekt / tema
HRZZ-IP-2013-11-1623 - Rekonstrukcija okoliša u Hrvatskoj tijekom kvartara primjenom izotopnih metoda (Nada Horvatinčić, )

Ustanove
Institut "Ruđer Bošković", Zagreb,
Rudarsko-geološko-naftni fakultet, Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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