Sarnthein, Michael; Erlenkeuser, Helmut; von Grafenstein, Rita; Schröder, C (1984): Stable isotope record of benthic foraminifera and the planktic foraminifera Globigerinoides sacculifer from sediment core GIK13519-1, Sierra Leone Rise, eastern equatorial Atlantic [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.548488, Supplement to: Sarnthein, M et al. (1984): Stable isotope stratigraphy for the last 750.000 years. Meteor core 13519 from the eastern equatorial Atlantic. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C38, 9-24
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Abstract:
From a 10.7 m long gravity core from the Sierra Leone Rise (5°39.5' N, 19°51' W) a detailed oxygen and carbon isotope record of both planktonic and benthonic foraminifera species was obtained extending from the Recent to Jaramillo event. The analysis yielded six major results.
1. Benthos oxygen isotopes varied by 1.8-2.2 per mil from interglacial to glacial times and may indicate a synglacial cooling of North Atlantic Deep Water at 2800 m depth by 1-3°C.
2. Variable anomalies between the benthos and plankton d18O record indicate a cooling of sea-surface temperatures (SST) by up to 6 °C during some glacial stages.
3. Southerly trade winds and equatorial upwelling may excert the primary control off SST variations, in particular of extremee values of cold and warm stages and of the abrupt character of climate transitions and their leads and lags, and finally, of variable sedimentation rates.
4. The benthos d13C record correlates well with the flux and preservation of organic matter.
5. A new time scale, CARPOR, was established from the assumption that terrigenous sediment supply was ± constant bit CaCO3 varied considerably. When applied to the d18O record, three major and numerous short-term variations of sedimentation rates (0.8 to 4.0 cm/kyr) can be distinguished.
6. The climatic record was modified by bioturbation much more strongly during cold than during warm stages.
Project(s):
Coverage:
Latitude: 5.670000 * Longitude: -19.851667
Date/Time Start: 1979-03-01T00:00:00 * Date/Time End: 1979-03-01T00:00:00
Event(s):
GIK13519-1 * Latitude: 5.670000 * Longitude: -19.851667 * Date/Time: 1979-03-01T00:00:00 * Elevation: -2862.0 m * Recovery: 10.7 m * Location: Atlantic Ocean * Campaign: M51 (FGGE-Equator 79 - First GARP Global Experiment) * Basis: Meteor (1964) * Method/Device: Gravity corer (Kiel type) (SL)
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Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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Datasets listed in this publication series
- Sarnthein, M; Erlenkeuser, H; von Grafenstein, R et al. (1984): (Table 3) Stable carbon and oxygen istotope ratios of Cibicidoides wuellerstorfi from sediment core GIK13519-1, Sierra Leone Rise, eastern equatorial Atlantic. https://doi.org/10.1594/PANGAEA.134925
- Sarnthein, M; Erlenkeuser, H; von Grafenstein, R et al. (1984): (Table 2) Stable isotope analysis on the planktonic foraminifer Globigerinoides sacculifer from sediment core GIK13519-1. https://doi.org/10.1594/PANGAEA.106217