On 13-15 June, the 15th International Symposiun on the interactions between sediments and water was held in Piran in hybrid form. We presented a study on the use of U and Sr isotope ratios in river carbonate as quantitative identifiers of authigenic carbonate.
J1-9179 - Non-traditional isotopes as identifiers of authigenic carbonates
Non-traditional isotopes as identifiers of authigenic carbonates, 1. 7. 2018 - 30. 6. 2021, Sonja Lojen
Authigenic carbonate has been invoked as the third major global sink of CO2, and quantitative estimates of its production have so far been made only for marine carbonates. The first estimates in terrestrial environment were made based on Sr isotopes (δ88/86Sr) in river water and the results indicate that this sink is most probably largely underestimated. Consequently, the magnitude of terrestrial carbon fluxes and terrestrial carbon mass balance should to be reconsidered.
This project aims to validate advanced isotopic tools for identification and quantification of authigenic carbonate in terrestrial sediments and aquifers in areas dominated by carbonate lithology. As identifiers of authigenic carbonate, ratios of so-called non-traditional isotopes of Mg, Sr, U and Mo will be explored (the term “non-traditional isotopes” applies to those which are analysed using advanced plasma source mass spectrometry with multiple collectors – MC-ICP-MS). The goal of the project is to develop an analytical toolkit for differentiation of authigenic carbonate phases from detrital carbonate in complex sedimentary settings in areas dominated by carbonaceous lithology.
Slovenian National Building and Civil Engineering Institute: Vilma Ducman (group leader),
The last sampling campaign in »Krka« National park, Croatia, was conducted in the first week of April in the framework of the bilateral collaboration project »Non-traditional isotopes as a new tool for estimation of continental CO2 sinks«.
On November 3, 2021, Leja Rovan defended her PhD thesis entitled “Method for the determination of uranium isotope ratios and its application as a novel geochemical tracer” at the Jožef Stefan International Postgraduate School.
In the first week of September, lacustrine tufaceous samples were taken from river Krka at Brljan Lakes in “Krka” National Park, Croatia, for the analyses of isotopic composition of Mo, U, Sr and Mg in the sediment and interstitial water.