Staudigel, Hubert; Kastner, Miriam; Sturz, Anne Aleda (1986): Temperature, d18O, d13C, K, Rb, and Sr concentrations and 87Sr/86Sr values of calcites from DSDP Site 92-597 and fish teeth from DSDP Sites 15-149, 68-502, and 98-576 and from sediment cores AMPH-116 and DODO-111. PANGAEA, https://doi.org/10.1594/PANGAEA.792562, Supplement to: Staudigel, H et al. (1986): d18O and 87Sr/86Sr of calcites from the basaltic basement of Deep Sea Drilling Project Site 597: timing and temperature of alteration. In: Leinen, M; Rea DK; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 92, 499-503, https://doi.org/10.2973/dsdp.proc.92.131.1986
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Calcites from the basaltic basement at Deep Sea Drilling Project Site 597, containing 3.4 to 4.4 mol % MgCO3, were analyzed for d13C, d18O, 87Sr/86Sr, K, Rb, and Sr concentrations. The d13C values range from 1.9 to 2.4 per mil (relative to PDB) and are typical for calcites from the extrusive layer of the oceanic crust. The d18O values of calcites are very uniform and unusually high (2.33 to 2.77 per mil, PDB), which suggest temperatures of formation of 1.5 to 2.9°C and 0.03 to 1.7°C using the calibrations of O'Neil et al. (1969) and Epstein et al. (1953), respectively (after correction for MgCO3), and assuming - l per mil for the late Oligocene/early Miocene bottom water. Paleogene bottom waters are thought to have been warmer than those of present day, and hence the calibration of Epstein et al. (1953) yields more reasonable temperatures for late Oligocene/early Miocene bottom waters. K and Rb concentrations are very low, which is consistent with their incompatible character. Sr/Ca ratios of calcites from sub-basement depths less than 35 m are typical for calcites precipitated from pure seawater, whereas the lowermost sample, from a sub-basement depth of 78 m, appears to contain substantial amounts of basaltic Ca. The 87Sr/86Sr ratios of seawater calcites range from 0.708192 to 0.708349, suggesting that they precipitated from 20 to 28 Ma seawater, or within 8 m.y. after formation of the oceanic crust at Site 597. Our data for calcites from Site 597, drilled on fast-spreading oceanic crust, are similar to data for carbonates from slowspreading crust, except that the high d18O values of the former suggest low temperatures of formation. The low temperatures of calcite formation apparently indicate that the oceanic crust at Site 597 was unusually permeable, allowing rapid circulation of seawater.
Median Latitude: -12.420233 * Median Longitude: -151.736450 * South-bound Latitude: -21.983000 * West-bound Longitude: 77.367000 * North-bound Latitude: 32.356000 * East-bound Longitude: -69.364200
Date/Time Start: 1964-02-11T00:00:00 * Date/Time End: 1983-03-02T00:00:00