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- W2529548649 abstract "Abstract Tufa samples from 16 consecutive barrages along a 13 km section of the groundwater‐fed Krka River (Slovenia) were analysed for their petrographical, mineralogical, elemental and stable carbon ( δ 13 C) and oxygen ( δ 18 O) isotope composition, to establish their relation to current climatic and hydrological conditions. Waters constantly oversaturated with calcite and the steep morphology of the Krka riverbed stimulate rapid CO 2 degassing and subsequent tufa precipitation. The carbon isotope fractionation (Δ 13 C) between dissolved inorganic carbon and tufa in the Krka River evolves towards isotopic equilibrium being controlled by continuous CO 2 degassing and tufa precipitation rate downstream. The Δ 13 C increased from 1·9 to 2·5‰ (VPDB); however, since tufa precipitation rates remain similar downstream, the major controlling factor of carbon isotope exchange is most probably related to the continuous 12 CO 2 degassing downstream leaving the carbon pool enriched in 13 C. In the case of oxygen, the isotope fractionation (Δ 18 O) was found to be from 1·0 to 2·3‰ (VSMOW) smaller than reported in the literature. The observed discrepancies are due to different precipitation rates of calcite deposits because Krka tufas on cascades grow relatively faster compared to slowly precipitated calcite deposits in cave or stream pools. Due to non‐equilibrium oxygen isotope exchange between Krka tufa and water, the δ 18 O proxy showed from 1·2 to 8·2°C higher calculated water temperatures compared to measured water temperatures, demonstrating that δ 18 O proxy‐based temperature equations are not reliable for water temperature calculations of fast‐growing tufa on cascades. Because Mg is bound to the terrigenous dolomite fraction in the Krka tufa samples, the Mg/Ca was also found to be an unreliable temperature proxy yielding over up to 20°C higher calculated water temperatures." @default.
- W2529548649 created "2016-10-14" @default.
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- W2529548649 date "2016-12-09" @default.
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- W2529548649 title "Stable isotopic and elemental characteristics of recent tufa from a karstic Krka River (south-east Slovenia): useful environmental proxies?" @default.
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- W2529548649 doi "https://doi.org/10.1111/sed.12328" @default.
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