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Percent CaCO3 was determined in selected samples aboard the ship by the carbonate-bomb technique (Müller and Gastner, 1971). Results of these analyses are listed in Table 1 and plotted in Figures 1, 3, 4, and 5 as plus signs (+). Samples collected specifically for analyses of CaCO3 and organic carbon were analyzed at three shorebased laboratories. Concentrations of total carbon, organic carbon, and CaCO3 were determined in some samples at the DSDP sediment laboratory, using a Leco carbon analyzer, by personnel of the U.S. Geological Survey, under the supervision of T. L. Valuer (Table 2; plotted as square symbols in Figs. 1, 3, 4, and 5). Most of these samples were collected from lithologic units containing relatively high concentrations of organic carbon. Sample procedures are outlined in Boyce and Bode (1972). Precision and accuracy are both ±0.3% absolute for total carbon, ±0.06% absolute for organic carbon, and ±3% absolute for CaCO3. Concentrations of CaCO3 were determined in some samples with a Leco carbon analyzer at the University of Oslo under the supervision of Jörn Thiede (Table 3; plotted as circles in Figs. 1,3,4, and 5). The Oslo samples were mostly from lithologic units containing very low concentrations of organic carbon. The concentration of CaCO3 was calculated by multiplying the total carbon content by 8.33. The accuracy of the method is -2% to +5% of the amount of CaCO3 present. Concentrations of CaCO3 and organic carbon were determined at the University of Oslo on selected samples from Cores 69 through 72 of Hole 463 that were suspected to contain relatively high concentrations of organic carbon (Table 4; Fig. 2). Concentrations of CaCO3 and organic carbon were determined at the U.S. Geological Survey, Denver, Colorado, in samples of midCretaceous limestone from Holes 463, 465A, and 466 that were suspected to contain relatively high concentrations of organic carbon (see Dean et al., this volume). Results of the USGS analyses are plotted as triangles in Figures 1, 2, 4, and 5. Concentrations of carbonate in samples analyzed by Müller et al. (this volume) are plotted in Figures 1, 3, 4, and 5 as X-symbols.

Calcium Carbonate and Organic Carbon in Samples from Deep Sea Drilling Project Sites 463, 464, 465, and 466