Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2025
|
| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.975976 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1867170435520528384 |
|---|---|
| author | Stein, Ruediger Frederichs, Thomas Fahl, Kirsten Geibert, Walter Matthiessen, Jens Niessen, Frank Vogt, Christoph Sassenroth, Cynthia Bazhenova, Evgenia A |
| author_facet | Stein, Ruediger Frederichs, Thomas Fahl, Kirsten Geibert, Walter Matthiessen, Jens Niessen, Frank Vogt, Christoph Sassenroth, Cynthia Bazhenova, Evgenia A |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Sediment Core PS115/2-2 was recovered from the Amundsen Basin in 3600 m water depth at the eastern flank of the Gakkel Ridge during Polarstern Expedition PS115/2 in 2018 (Stein, 2019). The well-dated core is used to reconstruct in detail the interrelationship between ice-sheet dynamics and organic carbon burial in the central Eurasian Basin during the last 430 kyr, and to correlate marine and terrestrial records of the Eurasian Ice Sheet (EIS) history. Using organic-geochemical bulk parameters (i.e., TOC, C/N ratios, Rock Eval) and biomarkers, we have identified prominent well-defined sections with strongly elevated concentration of ancient (petrogenic) predominantly terrestrial OC, coinciding with glacial time intervals of extended ice sheets and the subsequent terminations/deglacials. Based on the presence of specific biomarkers indicative for increased preservation of labile algae-type OC under anoxic sedimentary conditions, we demonstrate that even during strong glacial intervals there must have been at least occasionally open-water (polynya-type) conditions along the Eurasian continental margin in front of the ice sheet with marine and sea-ice algae productivity (cf., Fahl & Stein, 2012; Naafs et al., 2024). For details and methods, we also refer to Stein et al. (this paper). |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_975976 |
| institution | PANGAEA |
| language | en |
| publishDate | 2025 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Biomarkers of sediment core PS115/2_2 Stein, Ruediger Frederichs, Thomas Fahl, Kirsten Geibert, Walter Matthiessen, Jens Niessen, Frank Vogt, Christoph Sassenroth, Cynthia Bazhenova, Evgenia A (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit sediment mass; (C27+C29+C31)/(C17+C19) n-alkanes ratio; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-4-enyl)pentadecane, per unit sediment mass; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, per unit sediment mass; 24-ethylcholest-5-en-3beta-ol, per unit sediment mass; 24-methylcholest-5-en-3beta-ol, per unit sediment mass; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit sediment mass; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol; AGE; Arctic Ocean; BC; Box corer; Calculated; Carbon, organic, total; Carbon Preference Index, n-Alkanes (C24-C34); DEPTH, sediment/rock; Dialkyl glycerol diether with two C15 alkyl chains, per unit sediment mass; Element analyser CHN, Heraeus; Eurasian Ice Sheet History; Event label; Gas chromatography; Gas chromatography - Mass spectrometry (GC-MS); Giant box corer; GKG; Late Pleistocene; Long-chain n-alkanes, C27H56+C29H60+C31H64, per unit sediment mass; Organic carbon (OC) burial; Polarstern; Pristane/Phytane ratio; PS115/2; PS115/2_2-1; PS115/2_2-2; Short-chain n-alkanes, C17H36+C19H40, per unit sediment mass Sediment Core PS115/2-2 was recovered from the Amundsen Basin in 3600 m water depth at the eastern flank of the Gakkel Ridge during Polarstern Expedition PS115/2 in 2018 (Stein, 2019). The well-dated core is used to reconstruct in detail the interrelationship between ice-sheet dynamics and organic carbon burial in the central Eurasian Basin during the last 430 kyr, and to correlate marine and terrestrial records of the Eurasian Ice Sheet (EIS) history. Using organic-geochemical bulk parameters (i.e., TOC, C/N ratios, Rock Eval) and biomarkers, we have identified prominent well-defined sections with strongly elevated concentration of ancient (petrogenic) predominantly terrestrial OC, coinciding with glacial time intervals of extended ice sheets and the subsequent terminations/deglacials. Based on the presence of specific biomarkers indicative for increased preservation of labile algae-type OC under anoxic sedimentary conditions, we demonstrate that even during strong glacial intervals there must have been at least occasionally open-water (polynya-type) conditions along the Eurasian continental margin in front of the ice sheet with marine and sea-ice algae productivity (cf., Fahl & Stein, 2012; Naafs et al., 2024). For details and methods, we also refer to Stein et al. (this paper). |
| title | Biomarkers of sediment core PS115/2_2 |
| topic | (9Z)-2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyliden)pentadeca-9-ene, per unit sediment mass; (C27+C29+C31)/(C17+C19) n-alkanes ratio; 2,10,14-Trimethyl-6-enyl-7-(3-methylpent-4-enyl)pentadecane, per unit sediment mass; 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, per unit sediment mass; 24-ethylcholest-5-en-3beta-ol, per unit sediment mass; 24-methylcholest-5-en-3beta-ol, per unit sediment mass; 24-Methylcholesta-5,22E-dien-3beta-ol, per unit sediment mass; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol; AGE; Arctic Ocean; BC; Box corer; Calculated; Carbon, organic, total; Carbon Preference Index, n-Alkanes (C24-C34); DEPTH, sediment/rock; Dialkyl glycerol diether with two C15 alkyl chains, per unit sediment mass; Element analyser CHN, Heraeus; Eurasian Ice Sheet History; Event label; Gas chromatography; Gas chromatography - Mass spectrometry (GC-MS); Giant box corer; GKG; Late Pleistocene; Long-chain n-alkanes, C27H56+C29H60+C31H64, per unit sediment mass; Organic carbon (OC) burial; Polarstern; Pristane/Phytane ratio; PS115/2; PS115/2_2-1; PS115/2_2-2; Short-chain n-alkanes, C17H36+C19H40, per unit sediment mass |
| url | https://doi.org/10.1594/PANGAEA.975976 |