Organic geochemistry on surface sediments from the Laptev Sea
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1997
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| _version_ | 1867171382410870784 |
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| author | Fahl, Kirsten Stein, Ruediger |
| author_facet | Fahl, Kirsten Stein, Ruediger |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Sediment samples from the Laptev Sea, taken during the 1993 RV Polarstern expedition ARK IX/4 and the RV Ivan Kireyev expedition TRANSDRIFT I, were investigated for the amount and composition of their organic carbon fractions. Of major interest was the identification of different processes controlling organic carbon deposition (i.e. terrigenous supply vs. surface water productivity). Long-chain unsaturated alkenones derived from prymnesiophytes, and fatty acids derived from diatoms and dinoflagellates, were analysed by means of gas chromatography and mass spectrometry. First results on the distribution of these biomarkers in surface sediments indicate that the surface water productivity signal is well preserved in the sediment data. This is shown by the distribution of the 16:1(n-7) and 20:5(n-3) fatty acids indicative for diatoms, and the excellent correlation with the chlorophyll a concentrations in the surface water masses and the biogenic-opal content and increased hydrogen indices of the sediments. The high concentration of these unsaturated fatty acids in shallow water sediments shows the recent deposition of the organic material. In deep-sea sediments, on the other hand, the concentrations are low. This decreased content is typical for phytoplankton material which has been degraded by microorganisms or autoxidation. In general, the alkenone concentrations are very low, suggesting low production rates by prymnesiophytes. Only at one station from the lower continental margin influenced by the inflow of Atlantic water masses, were some higher amounts of alkenones determined. Long-chain n-alkanes as well as high C/N ratios and low hydrogen indices indicate the importance of (fluvial) supply of terrigenous organic matter. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_54605 |
| institution | PANGAEA |
| language | en |
| publishDate | 1997 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Organic geochemistry on surface sediments from the Laptev Sea Fahl, Kirsten Stein, Ruediger ARK-IX/4; AWI_Paleo; BCR; Box corer (Reineck); Carbon, organic, total; DEPTH, sediment/rock; Element analyser CHN, LECO CNS-2000; Elevation of event; Event label; Gas chromatography; Giant box corer; GKG; Hydrogen index, mass HC, per unit mass total organic carbon; IK9301-1; IK9306-5; IK9307-3; IK9309-2; IK9313-7; IK9315-2; IK9316-8; IK9318-5; IK9320-2; IK9321-4; IK9323-5; IK9324-3; IK9327-5; IK9330-4; IK9334-6; IK9338-4; IK9340-5; IK9342-5; IK9344-10; IK9349-7; IK9350-7; IK9353-8; IK9356-1; IK9358-5; IK9365-8; IK9367-1; IK9368-8; IK9370-6; IK9371-3; IK9373A-6; IK9382-7; IK93Z2-5; IK93Z3-4; IK93Z4-3; IK93Z5-4; Ivan Kireyev; Laptev Sea; Laptev Sea, Taymyr Island; Latitude of event; Long-chain n-alkanes, C27H56+C29H60+C31H64, per unit sediment mass; Longitude of event; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS2450-2; PS2451-2; PS2452-2; PS2453-2; PS2455-3; PS2458-3; PS2459-2; PS2460-3; PS2461-2; PS2462-3; PS2463-3; PS2465-3; PS2466-3; PS2467-3; PS2468-3; PS2469-3; PS2470-3; PS2471-3; PS2472-3; PS2473-3; PS2474-2; PS2475-1; PS2476-3; PS2477-3; PS2478-3; PS2480-2; PS2481-2; PS2483-2; PS2484-2; PS2485-1; PS27; PS27/028; PS27/029; PS27/030; PS27/031; PS27/033; PS27/038; PS27/039; PS27/040; PS27/041; PS27/043; PS27/044; PS27/047; PS27/048; PS27/049; PS27/050; PS27/052; PS27/053; PS27/054; PS27/056; PS27/058; PS27/059; PS27/060; PS27/062; PS27/064; PS27/065; PS27/067; PS27/068; PS27/070; PS27/071; PS27/072; Quaternary Environment of the Eurasian North; QUEEN; Rock eval pyrolysis (Behar et al., 2001); Short-chain n-alkanes, C15H32+C17H36+C19H40, per unit sediment mass; Transdrift-I; Vilkitsky Strait; Water sample; WS Sediment samples from the Laptev Sea, taken during the 1993 RV Polarstern expedition ARK IX/4 and the RV Ivan Kireyev expedition TRANSDRIFT I, were investigated for the amount and composition of their organic carbon fractions. Of major interest was the identification of different processes controlling organic carbon deposition (i.e. terrigenous supply vs. surface water productivity). Long-chain unsaturated alkenones derived from prymnesiophytes, and fatty acids derived from diatoms and dinoflagellates, were analysed by means of gas chromatography and mass spectrometry. First results on the distribution of these biomarkers in surface sediments indicate that the surface water productivity signal is well preserved in the sediment data. This is shown by the distribution of the 16:1(n-7) and 20:5(n-3) fatty acids indicative for diatoms, and the excellent correlation with the chlorophyll a concentrations in the surface water masses and the biogenic-opal content and increased hydrogen indices of the sediments. The high concentration of these unsaturated fatty acids in shallow water sediments shows the recent deposition of the organic material. In deep-sea sediments, on the other hand, the concentrations are low. This decreased content is typical for phytoplankton material which has been degraded by microorganisms or autoxidation. In general, the alkenone concentrations are very low, suggesting low production rates by prymnesiophytes. Only at one station from the lower continental margin influenced by the inflow of Atlantic water masses, were some higher amounts of alkenones determined. Long-chain n-alkanes as well as high C/N ratios and low hydrogen indices indicate the importance of (fluvial) supply of terrigenous organic matter. |
| title | Organic geochemistry on surface sediments from the Laptev Sea |
| topic | ARK-IX/4; AWI_Paleo; BCR; Box corer (Reineck); Carbon, organic, total; DEPTH, sediment/rock; Element analyser CHN, LECO CNS-2000; Elevation of event; Event label; Gas chromatography; Giant box corer; GKG; Hydrogen index, mass HC, per unit mass total organic carbon; IK9301-1; IK9306-5; IK9307-3; IK9309-2; IK9313-7; IK9315-2; IK9316-8; IK9318-5; IK9320-2; IK9321-4; IK9323-5; IK9324-3; IK9327-5; IK9330-4; IK9334-6; IK9338-4; IK9340-5; IK9342-5; IK9344-10; IK9349-7; IK9350-7; IK9353-8; IK9356-1; IK9358-5; IK9365-8; IK9367-1; IK9368-8; IK9370-6; IK9371-3; IK9373A-6; IK9382-7; IK93Z2-5; IK93Z3-4; IK93Z4-3; IK93Z5-4; Ivan Kireyev; Laptev Sea; Laptev Sea, Taymyr Island; Latitude of event; Long-chain n-alkanes, C27H56+C29H60+C31H64, per unit sediment mass; Longitude of event; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS2450-2; PS2451-2; PS2452-2; PS2453-2; PS2455-3; PS2458-3; PS2459-2; PS2460-3; PS2461-2; PS2462-3; PS2463-3; PS2465-3; PS2466-3; PS2467-3; PS2468-3; PS2469-3; PS2470-3; PS2471-3; PS2472-3; PS2473-3; PS2474-2; PS2475-1; PS2476-3; PS2477-3; PS2478-3; PS2480-2; PS2481-2; PS2483-2; PS2484-2; PS2485-1; PS27; PS27/028; PS27/029; PS27/030; PS27/031; PS27/033; PS27/038; PS27/039; PS27/040; PS27/041; PS27/043; PS27/044; PS27/047; PS27/048; PS27/049; PS27/050; PS27/052; PS27/053; PS27/054; PS27/056; PS27/058; PS27/059; PS27/060; PS27/062; PS27/064; PS27/065; PS27/067; PS27/068; PS27/070; PS27/071; PS27/072; Quaternary Environment of the Eurasian North; QUEEN; Rock eval pyrolysis (Behar et al., 2001); Short-chain n-alkanes, C15H32+C17H36+C19H40, per unit sediment mass; Transdrift-I; Vilkitsky Strait; Water sample; WS |
| url | https://doi.org/10.1594/PANGAEA.54605 |