The solvent-extractable lipids of Sections 14-4, 18-3, and 28-4 from the Valanginian turbidite sequence of Hole 416A were examined. The major compound classes studied include π-alkanes, «-alkanoic acids, acyclic isoprenoid alkanes, steranes, rearranged sterenes, 4-methyl rearranged sterenes, triterpanes, triterpenes, aromatic hydrocarbons, and porphyrins. The distributions of these compounds suggest fairly uniform contributions from terrigenous, algal, and bacterial sources. Minor variations in composition may be attributed to slight changes in the relative proportions of these different sources. The lipid distributions also show that all three samples are at an immature stage of diagenesis. Comparison of constituents with those of Leg 48 black shales shows several similarities in distributions that suggest common sources. Qualitative and quantitative differences, however, exist; for example, the Leg 48 samples appear to possess a greater proportion of organic matter of bacterial origin.
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