Organic-carbon content and carbon isotopic compositions within the Pleistocene and Pliocene-Oligocene sections at Sites 565-570 in the Middle American Trench area were internally consistent. For the Pleistocene section, a decrease in organic-carbon content toward present-day land and a relatively constant carbon isotopic composition (δ 13 C = -20.1 to -21.6‰) was observed. For the Pliocene-Oligocene section, there is a general increase in organic-carbon content in the direction of present-day land. A general relationship between organic-carbon content and carbon isotopic ratios was observed where high organic-carbon levels were associated with heavier (more positive) carbon isotopic ratios and where low organic-carbon concentrations were associated with lighter (more negative) carbon isotope values. Hexane-extractable organic matter (EOM) was generally less than 500 ppm at all sites and showed a random distribution. Fluorescence spectral patterns confirmed the presence of a few in situ aromatic compounds and a low level background of migrated petrogenic hydrocarbons. High perylene concentrations were associated with organic-carbon isotopic compositions typical of marine organic matter.
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