Terrigenous flux in the Rio Grande Rise area during the past 1500 ka: Evidence of deepwater advection or rapid response to continental rainfall patterns?
Surface sediment samples and three gravity cores from the eastern terrace of the Vema Channel, the western flank of the Rio Grande Rise, and the Brazilian continental slope were investigated for physical properties, grain size, and clay mineral composition. Discharge of the Rio Doce is responsible f...
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Language: | English |
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Amer Geophysical Union
1999
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Online Access: | https://archimer.ifremer.fr/doc/00240/35077/34547.pdf https://doi.org/10.1029/1998PA900012 https://archimer.ifremer.fr/doc/00240/35077/ |
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ftarchimer:oai:archimer.ifremer.fr:35077 2023-05-15T17:25:24+02:00 Terrigenous flux in the Rio Grande Rise area during the past 1500 ka: Evidence of deepwater advection or rapid response to continental rainfall patterns? Gingele, Fx Schmieder, F Von Dobeneck, T Petschick, R Ruhlemann, C 1999-02 application/pdf https://archimer.ifremer.fr/doc/00240/35077/34547.pdf https://doi.org/10.1029/1998PA900012 https://archimer.ifremer.fr/doc/00240/35077/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00240/35077/34547.pdf doi:10.1029/1998PA900012 https://archimer.ifremer.fr/doc/00240/35077/ Copyright 1999 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 1999-02 , Vol. 14 , N. 1 , P. 84-95 text Publication info:eu-repo/semantics/article 1999 ftarchimer https://doi.org/10.1029/1998PA900012 2021-09-23T20:25:32Z Surface sediment samples and three gravity cores from the eastern terrace of the Vema Channel, the western flank of the Rio Grande Rise, and the Brazilian continental slope were investigated for physical properties, grain size, and clay mineral composition. Discharge of the Rio Doce is responsible for kaolinite enrichments on the slope south of 20 degrees and at intermediate depths of the Rio Grande Rise. The long-distance advection of kaolinite with North Atlantic Deep Water from lower latitudes is of minor importance as evidenced by low kaolinite/chlorite ratios on the Mid-Atlantic Ridge. Cyclic variations of kaolinite/chlorite ratios in all our cores, with maxima in interglacials, are attributed to low- and high-latitude forcing of paleoclimate on the Brazilian mainland and the related discharge of the Rio Doce. A longterm trend toward more arid and "glacial" conditions from 1500 ka to present is superimposed on the glacial-interglacial cyclicity. Article in Journal/Newspaper North Atlantic Deep Water North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Mid-Atlantic Ridge Paleoceanography 14 1 84 95 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
Surface sediment samples and three gravity cores from the eastern terrace of the Vema Channel, the western flank of the Rio Grande Rise, and the Brazilian continental slope were investigated for physical properties, grain size, and clay mineral composition. Discharge of the Rio Doce is responsible for kaolinite enrichments on the slope south of 20 degrees and at intermediate depths of the Rio Grande Rise. The long-distance advection of kaolinite with North Atlantic Deep Water from lower latitudes is of minor importance as evidenced by low kaolinite/chlorite ratios on the Mid-Atlantic Ridge. Cyclic variations of kaolinite/chlorite ratios in all our cores, with maxima in interglacials, are attributed to low- and high-latitude forcing of paleoclimate on the Brazilian mainland and the related discharge of the Rio Doce. A longterm trend toward more arid and "glacial" conditions from 1500 ka to present is superimposed on the glacial-interglacial cyclicity. |
format |
Article in Journal/Newspaper |
author |
Gingele, Fx Schmieder, F Von Dobeneck, T Petschick, R Ruhlemann, C |
spellingShingle |
Gingele, Fx Schmieder, F Von Dobeneck, T Petschick, R Ruhlemann, C Terrigenous flux in the Rio Grande Rise area during the past 1500 ka: Evidence of deepwater advection or rapid response to continental rainfall patterns? |
author_facet |
Gingele, Fx Schmieder, F Von Dobeneck, T Petschick, R Ruhlemann, C |
author_sort |
Gingele, Fx |
title |
Terrigenous flux in the Rio Grande Rise area during the past 1500 ka: Evidence of deepwater advection or rapid response to continental rainfall patterns? |
title_short |
Terrigenous flux in the Rio Grande Rise area during the past 1500 ka: Evidence of deepwater advection or rapid response to continental rainfall patterns? |
title_full |
Terrigenous flux in the Rio Grande Rise area during the past 1500 ka: Evidence of deepwater advection or rapid response to continental rainfall patterns? |
title_fullStr |
Terrigenous flux in the Rio Grande Rise area during the past 1500 ka: Evidence of deepwater advection or rapid response to continental rainfall patterns? |
title_full_unstemmed |
Terrigenous flux in the Rio Grande Rise area during the past 1500 ka: Evidence of deepwater advection or rapid response to continental rainfall patterns? |
title_sort |
terrigenous flux in the rio grande rise area during the past 1500 ka: evidence of deepwater advection or rapid response to continental rainfall patterns? |
publisher |
Amer Geophysical Union |
publishDate |
1999 |
url |
https://archimer.ifremer.fr/doc/00240/35077/34547.pdf https://doi.org/10.1029/1998PA900012 https://archimer.ifremer.fr/doc/00240/35077/ |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
North Atlantic Deep Water North Atlantic |
genre_facet |
North Atlantic Deep Water North Atlantic |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 1999-02 , Vol. 14 , N. 1 , P. 84-95 |
op_relation |
https://archimer.ifremer.fr/doc/00240/35077/34547.pdf doi:10.1029/1998PA900012 https://archimer.ifremer.fr/doc/00240/35077/ |
op_rights |
Copyright 1999 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/1998PA900012 |
container_title |
Paleoceanography |
container_volume |
14 |
container_issue |
1 |
container_start_page |
84 |
op_container_end_page |
95 |
_version_ |
1766116821911470080 |