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Eight core samples, of Albian to Aptian age from Hole 402A drilled on the mid-continental slope of the Bay of Biscay, were analyzed for chlorophyll degradation products. Pigment concentrations were surprisingly low for these particular Cretaceous black shales and contrast with the large quantities of pigments found in Cretaceous sediments from the Cape, Angola, and Cape Verde basins off the west coast of Africa, where average pigment concentrations were 5.5 μg/g (Leg 41) and 8.0 μg/g (Leg 40). Small amounts (0.13 μg/g average value) of chlorins and nickel porphyrins were found in each sample; these values were relatively low with respect to organic carbon contents which ranged from 0.4 to 1.7 per cent for adjacent or nearby core samples. The type of depositional regime (redox and water depth) and amount of weathered terrestrial detrital input suggest themselves as important factors leading to the quality and quantity of preserved organic matter, thus accounting for the differences between yields of extractable pigments from Bay of Biscay Cretaceous sediments and yields from basins off the West African coast.

Tetrapyrrole Pigments in Cretaceous Sediments from the Bay of Biscay, IPOD Leg 48, Hole 402A