Algal and bacterial hydrocarbons in particulate matter and interfacial sediment of the Cariaco Trench

Details Algal and bacterial hydrocarbons in particulate matter and interfacial sediment of the Cariaco Trench Algal and bacterial hydrocarbons in particulate matter and interfacial sediment of the Cariaco Trench

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1325w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 5, pp.1325-1336

Computer Science

5

Scientific paper

particulate matter samples (<53 m and > 53 m size fractions) and sediment from the sediment-water interface were collected in the Cariaco Trench, an anoxic marine basin on the continental shelf of Venezuela, and analyzed for hydrocarbons. Concentrations of hydrocarbons were highest (10-20 ng/1) in oxic surface waters (0-150 m) and at the top of the anoxic zone (350-600 m), and were low (3-4 ng/l) in the low oxygen zone above the oxic-anoxic interface (150-250 m) and anoxic bottom waters (600-1150 m). Branched C 25 -trienes and -tetraenes dominated the hydrocarbon distributions in <53 m particles in the oxic zone, while the isoprenoid C 25 - and C 40 -alkanes, 2,6,10,15,19-pentamethyleicosane and lycopane, dominated in the <53 m particles in the anoxic waters; petrogenic C 17 -C 40 n -alkanes dominated the > 53 m particles. Particle size and depth distributions of the hydrocarbons demonstrate the importance of algal hydrocarbons in surface waters, coupled with increased abundances of bacterial hydrocarbons, especially in the <53 m particles, in the anoxic zone. These observations illustrate the importance of oxic-anoxic interfaces, even in the oceanic water column, as zones of intense microbial alteration of organic matter and as sources of some of the organic compounds found in sediments.

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