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Cretaceous sediments from DSDP Site 530 have been analyzed for organic carbon isotopic composition. The δ 1 3 C values in the sediments decrease from -22.7%0 to -27.5%0 in the following order: light-olive green mudstone/claystone, dark brown-red mudstone/siltstone/claystone, and black shale. This large range is primarily the result of variation in the relative amounts of terrestrial organic carbon superimposed on that derived from marine organisms. The black shales have an average δ 1 C value of 25.9% (range is from 23.7% to 27.5%O). These values indicate that they originated primarily in terrigenous organic materials. The average δ 1 C value present throughout the Cretaceous suggests that a large amount of terrestrial organic matter was supplied into this paleoenvironment, except during the Campanian, when an average δ 1 C of -23.9%0 is found near the marine end of the range.

Organic Carbon Isotopic Composition in Cretaceous Sediments, Angola Basin, Southeastern Atlantic, Deep Sea Drilling Project Site 530