Black shales from the Cape Verde Rise were penetrated by hot diabase sills during the Miocene. Characterization of the type of kerogen, its relative level of thermal maturity, the fraction of pyrolyzable organic compounds which are free, and the compositions of the bitumen and kerogen. Dominant factor affecting sediments appears to be thermal maturity. Hydrocarbon generation was restricted to within about 10 meters of the shale/sill contacts.--Modified journal abstract.

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