Environmental magnetism, geochemical measurements and colour reflectance of two sediment cores: GeoB4905-4 off Cameroon and GeoB4906-3 off Gabon, supplement to: Itambi, Achakie C; von Dobeneck, Tilo; Adegbie, Adesina T (2010): Millennial-scale precipitation changes over Central Africa during the late Quaternary and Holocene: evidence in sediments from the Gulf of Guinea. Journal of Quaternary Science, 25(3), 267-279
We combine environmental magnetism, geochemical measurements and colour reflectance to study two late Quaternary sediment cores: GeoB 4905-4 at 2° 30 N off Cameroon and GeoB 4906-3 at 0° 44 N off Gabon. This area is suitable for investigating precipitation changes over Central and West Africa becaus...
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ftdatacite:10.1594/pangaea.734354 2023-05-15T16:39:17+02:00 Environmental magnetism, geochemical measurements and colour reflectance of two sediment cores: GeoB4905-4 off Cameroon and GeoB4906-3 off Gabon, supplement to: Itambi, Achakie C; von Dobeneck, Tilo; Adegbie, Adesina T (2010): Millennial-scale precipitation changes over Central Africa during the late Quaternary and Holocene: evidence in sediments from the Gulf of Guinea. Journal of Quaternary Science, 25(3), 267-279 Itambi, Achakie C 2010 application/zip https://dx.doi.org/10.1594/pangaea.734354 https://doi.pangaea.de/10.1594/PANGAEA.734354 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1002/jqs.1306 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Gravity corer Kiel type M41/1 Meteor 1986 Center for Marine Environmental Sciences MARUM Supplementary Collection of Datasets Collection article 2010 ftdatacite https://doi.org/10.1594/pangaea.734354 https://doi.org/10.1002/jqs.1306 2022-02-08T16:24:46Z We combine environmental magnetism, geochemical measurements and colour reflectance to study two late Quaternary sediment cores: GeoB 4905-4 at 2° 30 N off Cameroon and GeoB 4906-3 at 0° 44 N off Gabon. This area is suitable for investigating precipitation changes over Central and West Africa because of its potential to record input of aeolian and fluvial sediments. Three magnetozones representing low and high degree of alteration of the primary rock magnetic signals were identified. The magnetic signature is dominated by fine-grained magnetite, while residual haematite prevails in the reduced intervals, showing increase in concentration and fine grain size at wet intervals. Our records also show millennial-scale changes in climate during the last glacial and interglacial cycles. At the northern location, the past 5.5 ka are marked by high-frequency oscillations of Ti and colour reflectance, which suggests aeolian input and hence aridity. The southern location remains under the influence of the Intertropical Convergence Zone and thus did not register aeolian signals. The millennial-scale climatic signals indicate that drier and/or colder conditions persisted during the late Holocene and are synchronous with the 900 a climatic cycles observed in Northern Hemisphere ice core records. Article in Journal/Newspaper ice core 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 M41/1 Meteor 1986 Center for Marine Environmental Sciences MARUM |
spellingShingle |
Gravity corer Kiel type M41/1 Meteor 1986 Center for Marine Environmental Sciences MARUM Itambi, Achakie C Environmental magnetism, geochemical measurements and colour reflectance of two sediment cores: GeoB4905-4 off Cameroon and GeoB4906-3 off Gabon, supplement to: Itambi, Achakie C; von Dobeneck, Tilo; Adegbie, Adesina T (2010): Millennial-scale precipitation changes over Central Africa during the late Quaternary and Holocene: evidence in sediments from the Gulf of Guinea. Journal of Quaternary Science, 25(3), 267-279 |
topic_facet |
Gravity corer Kiel type M41/1 Meteor 1986 Center for Marine Environmental Sciences MARUM |
description |
We combine environmental magnetism, geochemical measurements and colour reflectance to study two late Quaternary sediment cores: GeoB 4905-4 at 2° 30 N off Cameroon and GeoB 4906-3 at 0° 44 N off Gabon. This area is suitable for investigating precipitation changes over Central and West Africa because of its potential to record input of aeolian and fluvial sediments. Three magnetozones representing low and high degree of alteration of the primary rock magnetic signals were identified. The magnetic signature is dominated by fine-grained magnetite, while residual haematite prevails in the reduced intervals, showing increase in concentration and fine grain size at wet intervals. Our records also show millennial-scale changes in climate during the last glacial and interglacial cycles. At the northern location, the past 5.5 ka are marked by high-frequency oscillations of Ti and colour reflectance, which suggests aeolian input and hence aridity. The southern location remains under the influence of the Intertropical Convergence Zone and thus did not register aeolian signals. The millennial-scale climatic signals indicate that drier and/or colder conditions persisted during the late Holocene and are synchronous with the 900 a climatic cycles observed in Northern Hemisphere ice core records. |
format |
Article in Journal/Newspaper |
author |
Itambi, Achakie C |
author_facet |
Itambi, Achakie C |
author_sort |
Itambi, Achakie C |
title |
Environmental magnetism, geochemical measurements and colour reflectance of two sediment cores: GeoB4905-4 off Cameroon and GeoB4906-3 off Gabon, supplement to: Itambi, Achakie C; von Dobeneck, Tilo; Adegbie, Adesina T (2010): Millennial-scale precipitation changes over Central Africa during the late Quaternary and Holocene: evidence in sediments from the Gulf of Guinea. Journal of Quaternary Science, 25(3), 267-279 |
title_short |
Environmental magnetism, geochemical measurements and colour reflectance of two sediment cores: GeoB4905-4 off Cameroon and GeoB4906-3 off Gabon, supplement to: Itambi, Achakie C; von Dobeneck, Tilo; Adegbie, Adesina T (2010): Millennial-scale precipitation changes over Central Africa during the late Quaternary and Holocene: evidence in sediments from the Gulf of Guinea. Journal of Quaternary Science, 25(3), 267-279 |
title_full |
Environmental magnetism, geochemical measurements and colour reflectance of two sediment cores: GeoB4905-4 off Cameroon and GeoB4906-3 off Gabon, supplement to: Itambi, Achakie C; von Dobeneck, Tilo; Adegbie, Adesina T (2010): Millennial-scale precipitation changes over Central Africa during the late Quaternary and Holocene: evidence in sediments from the Gulf of Guinea. Journal of Quaternary Science, 25(3), 267-279 |
title_fullStr |
Environmental magnetism, geochemical measurements and colour reflectance of two sediment cores: GeoB4905-4 off Cameroon and GeoB4906-3 off Gabon, supplement to: Itambi, Achakie C; von Dobeneck, Tilo; Adegbie, Adesina T (2010): Millennial-scale precipitation changes over Central Africa during the late Quaternary and Holocene: evidence in sediments from the Gulf of Guinea. Journal of Quaternary Science, 25(3), 267-279 |
title_full_unstemmed |
Environmental magnetism, geochemical measurements and colour reflectance of two sediment cores: GeoB4905-4 off Cameroon and GeoB4906-3 off Gabon, supplement to: Itambi, Achakie C; von Dobeneck, Tilo; Adegbie, Adesina T (2010): Millennial-scale precipitation changes over Central Africa during the late Quaternary and Holocene: evidence in sediments from the Gulf of Guinea. Journal of Quaternary Science, 25(3), 267-279 |
title_sort |
environmental magnetism, geochemical measurements and colour reflectance of two sediment cores: geob4905-4 off cameroon and geob4906-3 off gabon, supplement to: itambi, achakie c; von dobeneck, tilo; adegbie, adesina t (2010): millennial-scale precipitation changes over central africa during the late quaternary and holocene: evidence in sediments from the gulf of guinea. journal of quaternary science, 25(3), 267-279 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2010 |
url |
https://dx.doi.org/10.1594/pangaea.734354 https://doi.pangaea.de/10.1594/PANGAEA.734354 |
genre |
ice core |
genre_facet |
ice core |
op_relation |
https://dx.doi.org/10.1002/jqs.1306 |
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.734354 https://doi.org/10.1002/jqs.1306 |
_version_ |
1766029616203431936 |