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The strontium, manganese, and iron concentrations of the carbonate fraction were measured in samples from Hauterivian to Pleistocene sediments. The carbonate fraction was obtained by crushing the samples and then dissolving them in acetic acid. Trace element analysis was conducted by atomic absorption spectrometry using the method described by Renard and Blanc (1971, 1972). Mineralogically, the composition of the carbonate fraction always corresponded to low magnesian calcite. Exceptions were found in Aptian-Albian beds which contained no calcium carbonates in spite of a high weight loss when dissolved in acetic acid. For these samples, X-ray analysis showed the presence of quartz, opal, amorphous matter, and rhodocrosite. All data are summarized in Table 1.

Strontium, Manganese, and Iron Contents, and Oxygen Isotopes in the Carbonate Fractions Recovered from Hole 398C, Leg 47B