16. SEARCH FOR TERRIGENOUS LIPIDS IN CARBONATE-RICH SAMPLES FROM SITE 39-354'

The lipids extracted from carbonate-rich samples from the Ceará Rise (Site 354) were examined for terrigenous components, which could be derived by potamic influx from the Amazon. The total lipid yields were low ( ~ 1 ppm) and consisted mainly of marine autochthonous components. Minor amounts of lipids attributable to a terrigenous origin were also present. These consisted of n-alkanes in the range n-Cis to n-Ca with an odd-to-even pre-dominance {n-d \ maximum), /7-fatty acids in the range n-Cu to n-C32 with an even-to-odd predominance, and the diterpenoid dehydroabietic acid. Thus, a minor potamic influx of terrigenous lipids has probably occurred to these sediments at this site