Organic geochemistry of lipids in marine sediments in the Canary Basin: Implications for origin and accumulation of organic matter
作者： Sten Lindblom , Ulf Järnberg , None
DOI: 10.1016/S1873-9881(04)80029-4
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摘要: Abstract The Canary basin consists of the continental margin off coast Northwest Africa, deep basin, Madeira Abyssal Plain (MAP) and volcanic Islands. has an area upwelling marine productivity with special characteristics: (a) a wide shelf area, (b) irregular zone upwelling, (c) proximity to large dust source—the Saharan desert. Islands divide slope into northern southern primary accumulation organic matter (OM). Accumulation OM in is augmented by input containing adsorbed terrigenous OM. n -Alkane distributions show pronounced maximum around C 29 31 strong odd-to-even predominance typical There are less maxima near 15 -C 17 , indicating recent origin for Fatty acids carbon number similar -alkanes, higher content substantially 16 /C 26 ratios near-surface sediments samples, which decrease depth sediment. above data from can be compared most turbidite “a” on MAP. Turbidite was emplaced about 1000 years ago, incorporating derived material representing 200,000-year time period. TOC biomarker signatures comparable “a”. Biomarker analyses deeper MAP continuing back early Miocene. Comparison seafloor surface biomarkers samples indicates varying contribution degradation components favor leaving long-chained compounds that increase signature sediments. component than analysis tends indicate. Polyaromatic hydrocarbons (PAH) low concentration, no human pollution effects were detected. Perylene suggest active diagenesis down sediment core.
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