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| Main Authors: | , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2003
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| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.55877 |
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| _version_ | 1867171383156408320 |
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| author | Schulte, Sonja Bard, Edouard |
| author_facet | Schulte, Sonja Bard, Edouard |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | In a deep-sea sediment core recovered from a site lying well above the local lysocline, several organic geochemical proxies, and two different calcite dissolution indicators, are compared in order to evaluate the relationship between calcite dissolution and paleoproductivity over the past three glacial-interglacial cycles. The degree of foraminiferal break-up, and the CaCO3 particle size distribution, both point to significant periods of dissolution every 22 kyr during glacial stages and substages. These dissolution events are concomitant with periods of enhanced primary productivity, as indicated by the abundance of several biomarkers (alkenones, cholesterol, brassicasterol, keto-ol), used here to indicate changes in paleoproductivity. Dissolution fluctuations are highly coherent and in phase with the estimated paleoproductivity variations providing strong evidence that the observed dissolution is due to organic matter remineralization within the sediments rather, than to changes in CO32? concentration in the overlying water column. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_55877 |
| institution | PANGAEA |
| language | en |
| publishDate | 2003 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Cholesterol and C30 of sediment profile MD90-963 Schulte, Sonja Bard, Edouard Cholesterol, per unit sediment mass; DEPTH, sediment/rock; Gas chromatography - Mass spectrometry (GC-MS); GS900963; Keto-ol, C30, per unit sediment mass; Marion Dufresne (1972); MD65; MD90-963; PC; Piston corer; SEYMAMA/SHIVA; SFB261; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents In a deep-sea sediment core recovered from a site lying well above the local lysocline, several organic geochemical proxies, and two different calcite dissolution indicators, are compared in order to evaluate the relationship between calcite dissolution and paleoproductivity over the past three glacial-interglacial cycles. The degree of foraminiferal break-up, and the CaCO3 particle size distribution, both point to significant periods of dissolution every 22 kyr during glacial stages and substages. These dissolution events are concomitant with periods of enhanced primary productivity, as indicated by the abundance of several biomarkers (alkenones, cholesterol, brassicasterol, keto-ol), used here to indicate changes in paleoproductivity. Dissolution fluctuations are highly coherent and in phase with the estimated paleoproductivity variations providing strong evidence that the observed dissolution is due to organic matter remineralization within the sediments rather, than to changes in CO32? concentration in the overlying water column. |
| title | Cholesterol and C30 of sediment profile MD90-963 |
| topic | Cholesterol, per unit sediment mass; DEPTH, sediment/rock; Gas chromatography - Mass spectrometry (GC-MS); GS900963; Keto-ol, C30, per unit sediment mass; Marion Dufresne (1972); MD65; MD90-963; PC; Piston corer; SEYMAMA/SHIVA; SFB261; South Atlantic in Late Quaternary: Reconstruction of Budget and Currents |
| url | https://doi.org/10.1594/PANGAEA.55877 |