Continuous 60-year stable isotopic and earth-alkali element records in a modern laminated tufa (Jaruga, river Krka, Croatia): Implications for climate reconstruction

Equilibrium vs. kinetic fractionation of oxygen isotopes in two low-temperature travertine-depositing systems with differing hydrodynamic conditions at Baishuitai, Yunnan, SW China

“…They found that the measured temperature was 8°C larger than the theoretical one calculated using the Kim and O'Neil (1997) equilibrium curve. Lojen et al (2009) studied the continuous 60-year carbon and oxygen isotope composition in a modern laminated tufa, and found that the absolute longterm temperature increase and inter-annual temperature variations were substantially overestimated although the calculated temperatures showed similar long-term trends in fluctuation of temperature and precipitation. This discrepancy was attributed to non-equilibrium conditions during carbonate precipitation that favored incorporation of the isotopically lighter species from water into the precipitate (Lojen et al, 2009).…”

“…However, there may be oxygen isotopic disequilibrium fractionation between deposits and parent solutions (McCrea, 1950;Hendy, 1971;Mickler et al, 2006;Dreybrodt, 2008;Kele et al, 2008Kele et al, , 2011Dietzel et al, 2009;DePaolo, 2011). Previous studies have used tufa (or travertine) to reconstruct paleotemperatures (Matsuoka et al, 2001;Ihlenfeld et al, 2003;O'Brien et al, 2006;Liu et al, 2006a;Kano et al, 2007;Kele et al, 2008Kele et al, , 2011Lojen et al, 2009;Brasier et al, 2010). However, few attempted to evaluate the effect of nonequilibrium fractionation (Kele et al, 2008(Kele et al, , 2011Lojen et al, 2009). In fact, many studies have shown that the oxygen isotopic equilibrium is rarely maintained during calcite precipitation under natural conditions (Gonfiantini et al, 1968;Friedman, 1970;Fouke et al, 2000;Mickler et al, 2006;Kele et al, 2008Kele et al, , 2011Lojen et al, 2009).…”

“…Previous studies have used tufa (or travertine) to reconstruct paleotemperatures (Matsuoka et al, 2001;Ihlenfeld et al, 2003;O'Brien et al, 2006;Liu et al, 2006a;Kano et al, 2007;Kele et al, 2008Kele et al, , 2011Lojen et al, 2009;Brasier et al, 2010). However, few attempted to evaluate the effect of nonequilibrium fractionation (Kele et al, 2008(Kele et al, , 2011Lojen et al, 2009). In fact, many studies have shown that the oxygen isotopic equilibrium is rarely maintained during calcite precipitation under natural conditions (Gonfiantini et al, 1968;Friedman, 1970;Fouke et al, 2000;Mickler et al, 2006;Kele et al, 2008Kele et al, , 2011Lojen et al, 2009). Kele et al (2008) measured the precipitating temperature and oxygen isotope fractionation between thermogene travertine and water in Egerszaló k (Bü kk Mts., Hungary).…”

“…Since Urey (1947) established the theoretical basis for the isotopic fractionation, oxygen isotope ratios (d 18 O) in terrestrial carbonate minerals, such as speleothems (Hendy, 1971; Thompson et al, 1974;Harmon et al, 1978;Bar-Matthews et al, 1996;Desmarchelier et al, 2000;Mickler et al, 2004;Cruz et al, 2005) and tufa/travertine (Matsuoka et al, 2001;Andrews and Brasier, 2005;Andrews, 2006;O'Brien et al, 2006;Liu et al, 2006a;Kano et al, 2007;Lojen et al, 2009;Brasier et al, 2010), have been widely used as a powerful tool in paleoclimate research. One may estimate the precipitating temperature due to the negative relationship between oxygen isotope fractionation (1000ln a calcite-water ) and temperature under equilibrium conditions if the d 18 O values of carbonate minerals and the parent water are known.…”

Wet–dry seasonal and spatial variations in the δ13C and δ18O values of the modern endogenic travertine at Baishuitai, Yunnan, SW China and their paleoclimatic and paleoenvironmental implications

“…doi:10. 1016/j.gca.2009.11.008 Despite the limitation of speleothem, the freshwater tufa and travertine (Pentecost, 1995;Ford and Pedley, 1996) could provide valuable paleoclimate and paleoenvironmental information (Hennig et al, 1983;Pazdur et al, 1988;Pentecost, 1995;Ford and Pedley, 1996;Andrews et al, 1997;Ihlenfeld et al, 2003;Kano et al, 2003Kano et al, , 2004Kano et al, , 2007Liu et al, 2003Liu et al, , 2006aGarnett et al, 2004;Smith et al, 2004;Andrews and Brasier, 2005;Andrews, 2006;O'Brien et al, 2006;Hori et al, 2008;Brasier et al, in press;Lojen et al, 2009;Ortiz et al, 2009). However, most of the previous studies used epigenic (meteogene) tufa (where the CO 2 is sourced from soil and atmosphere) and paid little attention to the endogenic (thermogene) travertine (where the CO 2 is sourced from a range of situations including hydrolysis and oxidation of reduced carbon, decarbonation of limestone or directly from the upper mantle) (Pentecost, 1995(Pentecost, , 2005Ford and Pedley, 1996;Liu et al, 2003Liu et al, , 2006a.…”