O isotope compositions. The conversion of 18O from SMOW scale to PDB scale was done following the equation 18OSMOW = 1.03086 18OPDB + 30.86 (Faure 1986). δ δ 87Sr/86Sr Isotope Composition Strontium isotope composition was measured at the GET laboratory using a MAT FINIGAN 261 thermal ionization mass spectrometer in order to quantify the mixing controls on travertine samples. Analyses were conducted on the lamina powders of samples 32 and 33 (for all lamina of sample 32 and lamina 1, 2, 6, 9, 16, 20 of sample 33). Powders were dissolved in 6 M HCl at ambient temperature prior to chemical separation and analyses. Sr was isolated from the matrix using Sr-Spec resin (Eichrom, USA). The 87Sr/86Sr ratio was defined as the average of 100 measurements of ion intensities following the static collection mode. The 87Sr/86Sr ratio was normalized to 86Sr/88Sr = 0.1194. Measured values for NBS 987 standard (recommended values of 0.710250) was 87Sr/86Sr = 0.710247 ± 8 (2E, n = 2). Reference Faure, G., 1986, Principles of isotope geology: New York, John Wiley & Sons, p. 429-459.
O isotope compositions. The conversion of 18O from SMOW scale to PDB scale was done following the equation δ 18OSMOW = 1.03086 δ 18OPDB + 30.86 (Faure 1986). 87Sr/86Sr Isotope Composition Strontium isotope composition was measured at the GET laboratory using a MAT FINIGAN 261 thermal ionization mass spectrometer in order to quantify the mixing controls on travertine samples. Analyses were conducted on the lamina powders of samples 32 and 33 (for all lamina of sample 32 and lamina 1, 2, 6, 9, 16, 20 of sample 33). Powders were dissolved in 6 M HCl at ambient temperature prior to chemical separation and analyses. Sr was isolated from the matrix using Sr-Spec resin (Eichrom, USA). The 87Sr/86Sr ratio was defined as the average of 100 measurements of ion intensities following the static collection mode. The 87Sr/86Sr ratio was normalized to 86Sr/88Sr = 0.1194. Measured values for NBS 987 standard (recommended values of 0.710250) was 87Sr/86Sr = 0.710247 ± 8 (2E, n = 2). Reference Faure, G., 1986, Principles of isotope geology: New York, John Wiley & Sons, p. 429-459.
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