Schubert, C. J.. Max Planck Institute for Marine Microbiology, firstname.lastname@example.org
, . J.. ,
BIOMARKER INVESTIGATIONS ON SEDIMENTS FROM THE CHILEAN SHELF OFF CONCEPCION
Four multicorer cores from the shelf off Chile were collected in March 1998, a year which was strongly influenced by El Niño. Oxygen contents of the bottom water were between 18 to 40 µM (pers. com. B. Strotmann). Organic carbon contents of the sediments vary between 1.5 and 4 %. Carbonate values are very low and rarely exceed 1%. d13C values vary from -20.6 to -22.8 ‰ in cores 4, 7, 18 indicating that the type of organic matter is mainly marine with some contributions of terrestrial organic matter.In core 14, values vary between -23.0 to -24.2 ‰ indicating higher contributions of terrestrial organic matter. Total chlorins, degradation products of chlorophyll, were measured. Highest concentrations were measured at station 7 with 30000ng/g. Lowest values occur at station 14. In general, values decline rapidly from the top to the bottom. For a more detailed investigation of the marine and terrestrial compounds in cores 4 and 18, long-chain n-alkanes and alcohols and sterols were determined. In both cores concentrations of biomarkers are similar, although the terrestrial derived markers are a little bit higher in core 4 from the bight showing a higher terrestrial contribution.
Day: Thursday, Feb. 4
Location: Sweeney Center