Southern Ocean laminated diatom ooze: mat deposits and potential for palaeo-flux studies, ODP Leg 177, Site 1093
Laminated diatom ooze samples collected during ODP Leg 177 were analysed using scanning electron microscope (SEM) and optical microscopy to test their potential as high-resolution records of Polar Front hydrography, surface production, and export. SEM analysis from two intervals, marine isotope stag...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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2002
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ftsouthampton:oai:eprints.soton.ac.uk:6116 2023-07-30T03:58:27+02:00 Southern Ocean laminated diatom ooze: mat deposits and potential for palaeo-flux studies, ODP Leg 177, Site 1093 Grigorov, Ivo Pearce, Richard B. Kemp, Alan E.S. 2002 https://eprints.soton.ac.uk/6116/ unknown Grigorov, Ivo, Pearce, Richard B. and Kemp, Alan E.S. (2002) Southern Ocean laminated diatom ooze: mat deposits and potential for palaeo-flux studies, ODP Leg 177, Site 1093. Deep Sea Research Part II: Topical Studies in Oceanography, 49 (16), 3391-3407. (doi:10.1016/S0967-0645(02)00089-9 <http://dx.doi.org/10.1016/S0967-0645(02)00089-9>). Article PeerReviewed 2002 ftsouthampton https://doi.org/10.1016/S0967-0645(02)00089-9 2023-07-09T20:29:13Z Laminated diatom ooze samples collected during ODP Leg 177 were analysed using scanning electron microscope (SEM) and optical microscopy to test their potential as high-resolution records of Polar Front hydrography, surface production, and export. SEM analysis from two intervals, marine isotope stage (MIS) 29 and 12/11, respectively, recovered from 50°S in the Atlantic Ocean (ODP Site 1093, Hole A, sections 13H-4 0–18 cm and 23H-4 0–22 cm), show abundant and well-preserved Thalassiothrix antarctica mats, thought to be indicative of rapid export from the surface and deposition in the sediment. A preliminary analysis of laminae succession points to a possible annual couplet/triplet succession of laminae, and suggests exceptionally high local sedimentation rates of 57 and 80 cm kyr?1 for MIS 12/11 and 29, respectively. Such high accumulation rates imply that local export from the surface layer and sequestration of biogenic silica and organic matter to the sediments may have been much higher than previously suggested. Résumé Des dépôt sédimentaires laminés de diatomites, recueillis pendant le Leg 177 de l’Ocean Drilling Program (ODP), ont été analysés en microscopie électronique à balayage (SEM) et en microscopie optique. Ces enregistrements sédimentaires présentent un fort potentiel pour reconstituer, avec une haute résolution, la production de matière exportée depuis la couche de surface de l’océan au niveau du Front Polaire. L’analyse en SEM des stades isotopiques 29 et 12/11, sur du matériel collecté à 50°S dans le secteur Atlantique de l’Océan Austral (site ODP 1093, Forage A, sections 13H-4 0–18 cm et 23H 0–22 cm) révèle des dépôts abondants et bien préservés de tapis de Thalassiothrix antarctica, suggérant une exportation rapide jusqu’au sédiment de matériel biogène généré à la surface de l’océan. Une analyse préliminaire des successions laminées par couple ou triplet indique des vitesses d’accumulation sédimentaire exceptionnellement élevées: 57 et 80 cm kan?1, respectivement pour les stades 12/11 et 29. De ... Article in Journal/Newspaper Antarc* Antarctica Southern Ocean University of Southampton: e-Prints Soton Austral Southern Ocean Deep Sea Research Part II: Topical Studies in Oceanography 49 16 3391 3407 |
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Open Polar |
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University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
unknown |
description |
Laminated diatom ooze samples collected during ODP Leg 177 were analysed using scanning electron microscope (SEM) and optical microscopy to test their potential as high-resolution records of Polar Front hydrography, surface production, and export. SEM analysis from two intervals, marine isotope stage (MIS) 29 and 12/11, respectively, recovered from 50°S in the Atlantic Ocean (ODP Site 1093, Hole A, sections 13H-4 0–18 cm and 23H-4 0–22 cm), show abundant and well-preserved Thalassiothrix antarctica mats, thought to be indicative of rapid export from the surface and deposition in the sediment. A preliminary analysis of laminae succession points to a possible annual couplet/triplet succession of laminae, and suggests exceptionally high local sedimentation rates of 57 and 80 cm kyr?1 for MIS 12/11 and 29, respectively. Such high accumulation rates imply that local export from the surface layer and sequestration of biogenic silica and organic matter to the sediments may have been much higher than previously suggested. Résumé Des dépôt sédimentaires laminés de diatomites, recueillis pendant le Leg 177 de l’Ocean Drilling Program (ODP), ont été analysés en microscopie électronique à balayage (SEM) et en microscopie optique. Ces enregistrements sédimentaires présentent un fort potentiel pour reconstituer, avec une haute résolution, la production de matière exportée depuis la couche de surface de l’océan au niveau du Front Polaire. L’analyse en SEM des stades isotopiques 29 et 12/11, sur du matériel collecté à 50°S dans le secteur Atlantique de l’Océan Austral (site ODP 1093, Forage A, sections 13H-4 0–18 cm et 23H 0–22 cm) révèle des dépôts abondants et bien préservés de tapis de Thalassiothrix antarctica, suggérant une exportation rapide jusqu’au sédiment de matériel biogène généré à la surface de l’océan. Une analyse préliminaire des successions laminées par couple ou triplet indique des vitesses d’accumulation sédimentaire exceptionnellement élevées: 57 et 80 cm kan?1, respectivement pour les stades 12/11 et 29. De ... |
format |
Article in Journal/Newspaper |
author |
Grigorov, Ivo Pearce, Richard B. Kemp, Alan E.S. |
spellingShingle |
Grigorov, Ivo Pearce, Richard B. Kemp, Alan E.S. Southern Ocean laminated diatom ooze: mat deposits and potential for palaeo-flux studies, ODP Leg 177, Site 1093 |
author_facet |
Grigorov, Ivo Pearce, Richard B. Kemp, Alan E.S. |
author_sort |
Grigorov, Ivo |
title |
Southern Ocean laminated diatom ooze: mat deposits and potential for palaeo-flux studies, ODP Leg 177, Site 1093 |
title_short |
Southern Ocean laminated diatom ooze: mat deposits and potential for palaeo-flux studies, ODP Leg 177, Site 1093 |
title_full |
Southern Ocean laminated diatom ooze: mat deposits and potential for palaeo-flux studies, ODP Leg 177, Site 1093 |
title_fullStr |
Southern Ocean laminated diatom ooze: mat deposits and potential for palaeo-flux studies, ODP Leg 177, Site 1093 |
title_full_unstemmed |
Southern Ocean laminated diatom ooze: mat deposits and potential for palaeo-flux studies, ODP Leg 177, Site 1093 |
title_sort |
southern ocean laminated diatom ooze: mat deposits and potential for palaeo-flux studies, odp leg 177, site 1093 |
publishDate |
2002 |
url |
https://eprints.soton.ac.uk/6116/ |
geographic |
Austral Southern Ocean |
geographic_facet |
Austral Southern Ocean |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_relation |
Grigorov, Ivo, Pearce, Richard B. and Kemp, Alan E.S. (2002) Southern Ocean laminated diatom ooze: mat deposits and potential for palaeo-flux studies, ODP Leg 177, Site 1093. Deep Sea Research Part II: Topical Studies in Oceanography, 49 (16), 3391-3407. (doi:10.1016/S0967-0645(02)00089-9 <http://dx.doi.org/10.1016/S0967-0645(02)00089-9>). |
op_doi |
https://doi.org/10.1016/S0967-0645(02)00089-9 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
49 |
container_issue |
16 |
container_start_page |
3391 |
op_container_end_page |
3407 |
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1772821246664245248 |