Radionuclide analyses, and sedimentation and accumulation rates of sediment core PS2319-1
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| Main Authors: | , , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2004
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| _version_ | 1867167662999601152 |
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| author | Francois, Roger Frank, Martin Rutgers van der Loeff, Michiel M Bacon, Michael P |
| author_facet | Francois, Roger Frank, Martin Rutgers van der Loeff, Michiel M Bacon, Michael P |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | There is increasing evidence indicating that syndepositional redistribution of sediment on the seafloor by bottom currents is common and can significantly affect sediment mass accumulation rates. Notwithstanding its common incidence, this process (generally referred to as sediment focusing) is often difficult to recognize. If redistribution is near synchronous to deposition, the stratigraphy of the sediment is not disturbed and sediment focusing can easily be overlooked. Ignoring it, however, can lead to serious misinterpretations of sedimentary fluxes, particularly when past changes in export flux from the overlying water are inferred. In many instances, this problem can be resolved, at least for sediments deposited during the late Quaternary, by normalizing to the flux of 230Th scavenged from seawater, which is nearly constant and equivalent to the known rate of production of 230Th from the decay of dissolved 234U. We review the principle, advantages and limitations of this method. Notwithstanding its limitations, it is clear that 230Th normalization does provide a means of achieving more accurate interpretations of sedimentary fluxes and eliminates the risk of serious misinterpretations of sediment mass accumulation rates. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_737638 |
| institution | PANGAEA |
| language | en |
| publishDate | 2004 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Radionuclide analyses, and sedimentation and accumulation rates of sediment core PS2319-1 Francois, Roger Frank, Martin Rutgers van der Loeff, Michiel M Bacon, Michael P ANT-X/5; AWI_MarGeoChem; Gravity corer (Kiel type); Marine Geochemistry @ AWI; Polarstern; PS22/817; PS22 06AQANTX_5; PS2319-1; Scotia Sea; SL There is increasing evidence indicating that syndepositional redistribution of sediment on the seafloor by bottom currents is common and can significantly affect sediment mass accumulation rates. Notwithstanding its common incidence, this process (generally referred to as sediment focusing) is often difficult to recognize. If redistribution is near synchronous to deposition, the stratigraphy of the sediment is not disturbed and sediment focusing can easily be overlooked. Ignoring it, however, can lead to serious misinterpretations of sedimentary fluxes, particularly when past changes in export flux from the overlying water are inferred. In many instances, this problem can be resolved, at least for sediments deposited during the late Quaternary, by normalizing to the flux of 230Th scavenged from seawater, which is nearly constant and equivalent to the known rate of production of 230Th from the decay of dissolved 234U. We review the principle, advantages and limitations of this method. Notwithstanding its limitations, it is clear that 230Th normalization does provide a means of achieving more accurate interpretations of sedimentary fluxes and eliminates the risk of serious misinterpretations of sediment mass accumulation rates. |
| title | Radionuclide analyses, and sedimentation and accumulation rates of sediment core PS2319-1 |
| topic | ANT-X/5; AWI_MarGeoChem; Gravity corer (Kiel type); Marine Geochemistry @ AWI; Polarstern; PS22/817; PS22 06AQANTX_5; PS2319-1; Scotia Sea; SL |
| url | https://doi.org/10.1594/PANGAEA.737638 |