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The aliphatic hydrocarbons of a Cretaceous black shale horizon (Sample 53OA-96-5, 77-82 cm) and its adjacent green claystone (Sample 530A-96-5, 72-77 cm) have been examined by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). In this preliminary investigation the two lithologies were not completely separated, and a unimodal series of n-alkane contaminants was recognized in the hydrocarbon distributions of the green claystone. The major differences between the two samples appear to be the absolute levels of aliphatic hydrocarbons and the relative abundance of Λ-alkanes. In terms of environments of deposition, it appears that the background levels of organic matter principally derived from terrestrial sources, as reflected by the green claystone, are periodically swamped by massive amounts of marine organic matter during episodes of black shale deposition.

Aliphatic Hydrocarbons of a Cretaceous Black Shale and Its Adjacent Green Claystone from the Southern Angola Basin, Deep Sea Drilling Project Leg 75