Clay mineralogy of sediment cores from the South-East Atlantic off Namibia, supplement to: Gingele, Franz; Schmiedl, Gerhard (1999): Comparison of independant proxies on deep water advection in the southeast Atlantic off Namibia. South African Journal of Marine Science, 21, 181-190
Independent proxies were assessed in two Late Quaternary sediment cores from the eastern South Atlantic to compare deep-water changes during the last 400 kyr. Two cores were recovered from beneath North Atlantic Deep Water (NADW) at approximately 3 000 m depth. Late Quaternary presence of NADW is in...
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ftdatacite:10.1594/pangaea.730462 2023-05-15T17:13:49+02:00 Clay mineralogy of sediment cores from the South-East Atlantic off Namibia, supplement to: Gingele, Franz; Schmiedl, Gerhard (1999): Comparison of independant proxies on deep water advection in the southeast Atlantic off Namibia. South African Journal of Marine Science, 21, 181-190 Gingele, Franz Schmiedl, Gerhard 1999 application/zip https://dx.doi.org/10.1594/pangaea.730462 https://doi.pangaea.de/10.1594/PANGAEA.730462 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.2989/025776199784126079 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Gravity corer Kiel type M20/2 Meteor 1986 Geosciences, University of Bremen GeoB Collection article Supplementary Collection of Datasets 1999 ftdatacite https://doi.org/10.1594/pangaea.730462 https://doi.org/10.2989/025776199784126079 2021-11-05T12:55:41Z Independent proxies were assessed in two Late Quaternary sediment cores from the eastern South Atlantic to compare deep-water changes during the last 400 kyr. Two cores were recovered from beneath North Atlantic Deep Water (NADW) at approximately 3 000 m depth. Late Quaternary presence of NADW is indicated by the Cibicidoides wuellerstorfi assemblage on the Walvis Ridge (Core GeoB 1214) and the Bulimina alazanensis assemblage on the Namibian continental slope (Core GeoB 1710). The propagation of NADW is exclusively observed during interglacials, with maximum factor loadings in Stages 1, 5, 7, 9 and 11. These maxima are consistent with peaks in kaolinite/chlorite ratios and maxima of poorly crystalline smectite in the clay-mineral record. Kaolinite and poorly crystalline smectite are products of intense chemical weathering. They are injected into the NADW at low latitudes, north of the study area, and advected south. Chlorite, which is stable under cold weathering regimes, is a characteristic mineral of water masses of southern origin. During glacial stages, it is advected north with Southern Component Water (SCW). Above the NADW/SCW depths, kaolinite/chlorite ratios vary only slightly without a significant glacial-interglacial pattern, as measured in a core (GeoB 1712) from 1 000 m deep on the same profile of the Namibian continental slope off Walvis Bay. Article in Journal/Newspaper NADW North Atlantic Deep Water North Atlantic DataCite Metadata Store (German National Library of Science and Technology) |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Gravity corer Kiel type M20/2 Meteor 1986 Geosciences, University of Bremen GeoB |
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Gravity corer Kiel type M20/2 Meteor 1986 Geosciences, University of Bremen GeoB Gingele, Franz Schmiedl, Gerhard Clay mineralogy of sediment cores from the South-East Atlantic off Namibia, supplement to: Gingele, Franz; Schmiedl, Gerhard (1999): Comparison of independant proxies on deep water advection in the southeast Atlantic off Namibia. South African Journal of Marine Science, 21, 181-190 |
topic_facet |
Gravity corer Kiel type M20/2 Meteor 1986 Geosciences, University of Bremen GeoB |
description |
Independent proxies were assessed in two Late Quaternary sediment cores from the eastern South Atlantic to compare deep-water changes during the last 400 kyr. Two cores were recovered from beneath North Atlantic Deep Water (NADW) at approximately 3 000 m depth. Late Quaternary presence of NADW is indicated by the Cibicidoides wuellerstorfi assemblage on the Walvis Ridge (Core GeoB 1214) and the Bulimina alazanensis assemblage on the Namibian continental slope (Core GeoB 1710). The propagation of NADW is exclusively observed during interglacials, with maximum factor loadings in Stages 1, 5, 7, 9 and 11. These maxima are consistent with peaks in kaolinite/chlorite ratios and maxima of poorly crystalline smectite in the clay-mineral record. Kaolinite and poorly crystalline smectite are products of intense chemical weathering. They are injected into the NADW at low latitudes, north of the study area, and advected south. Chlorite, which is stable under cold weathering regimes, is a characteristic mineral of water masses of southern origin. During glacial stages, it is advected north with Southern Component Water (SCW). Above the NADW/SCW depths, kaolinite/chlorite ratios vary only slightly without a significant glacial-interglacial pattern, as measured in a core (GeoB 1712) from 1 000 m deep on the same profile of the Namibian continental slope off Walvis Bay. |
format |
Article in Journal/Newspaper |
author |
Gingele, Franz Schmiedl, Gerhard |
author_facet |
Gingele, Franz Schmiedl, Gerhard |
author_sort |
Gingele, Franz |
title |
Clay mineralogy of sediment cores from the South-East Atlantic off Namibia, supplement to: Gingele, Franz; Schmiedl, Gerhard (1999): Comparison of independant proxies on deep water advection in the southeast Atlantic off Namibia. South African Journal of Marine Science, 21, 181-190 |
title_short |
Clay mineralogy of sediment cores from the South-East Atlantic off Namibia, supplement to: Gingele, Franz; Schmiedl, Gerhard (1999): Comparison of independant proxies on deep water advection in the southeast Atlantic off Namibia. South African Journal of Marine Science, 21, 181-190 |
title_full |
Clay mineralogy of sediment cores from the South-East Atlantic off Namibia, supplement to: Gingele, Franz; Schmiedl, Gerhard (1999): Comparison of independant proxies on deep water advection in the southeast Atlantic off Namibia. South African Journal of Marine Science, 21, 181-190 |
title_fullStr |
Clay mineralogy of sediment cores from the South-East Atlantic off Namibia, supplement to: Gingele, Franz; Schmiedl, Gerhard (1999): Comparison of independant proxies on deep water advection in the southeast Atlantic off Namibia. South African Journal of Marine Science, 21, 181-190 |
title_full_unstemmed |
Clay mineralogy of sediment cores from the South-East Atlantic off Namibia, supplement to: Gingele, Franz; Schmiedl, Gerhard (1999): Comparison of independant proxies on deep water advection in the southeast Atlantic off Namibia. South African Journal of Marine Science, 21, 181-190 |
title_sort |
clay mineralogy of sediment cores from the south-east atlantic off namibia, supplement to: gingele, franz; schmiedl, gerhard (1999): comparison of independant proxies on deep water advection in the southeast atlantic off namibia. south african journal of marine science, 21, 181-190 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1999 |
url |
https://dx.doi.org/10.1594/pangaea.730462 https://doi.pangaea.de/10.1594/PANGAEA.730462 |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_relation |
https://dx.doi.org/10.2989/025776199784126079 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.730462 https://doi.org/10.2989/025776199784126079 |
_version_ |
1766071011089842176 |