Palynology of marine sediment cores from the West African coast
Seven sediment cores from the cruises of the "Meteor" and "Valdivia" were examined palynologically. The cores were retrieved from the lower continental slope in the area of between 33.5° N and 8° N, off the West African coast. Most of the cores contain sediments from the last Gla...
Main Authors: | , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
1982
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.548485 https://doi.org/10.1594/PANGAEA.548485 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.548485 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.548485 2023-05-15T15:24:54+02:00 Palynology of marine sediment cores from the West African coast Agwu, Chiori O C Beug, Hans-Jürgen MEDIAN LATITUDE: 21.176104 * MEDIAN LONGITUDE: -15.914186 * SOUTH-BOUND LATITUDE: 7.701000 * WEST-BOUND LONGITUDE: -18.930000 * NORTH-BOUND LATITUDE: 33.620000 * EAST-BOUND LONGITUDE: -9.408333 * DATE/TIME START: 1971-10-31T00:00:00 * DATE/TIME END: 1973-03-22T15:12:00 1982-11-15 application/zip, 7 datasets https://doi.pangaea.de/10.1594/PANGAEA.548485 https://doi.org/10.1594/PANGAEA.548485 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.548485 https://doi.org/10.1594/PANGAEA.548485 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Agwu, Chiori O C; Beug, Hans-Jürgen (1982): Palynological studies of marine sediments off the West African coast. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C36, 1-30 ARKTIS 1993 East Atlantic GIK12309-3 GIK12310-4 GIK12329-6 GIK12392-1 KAL Kasten corer M12392-1 M25 M30 M30_184 M8_017-2 M8017B Meteor (1964) North Atlantic Ocean PC Piston corer SPC Sphincter corer VA132 VA132-18-1 Valdivia (1961) Westafrika 1973 Dataset 1982 ftpangaea https://doi.org/10.1594/PANGAEA.548485 2023-01-20T07:31:00Z Seven sediment cores from the cruises of the "Meteor" and "Valdivia" were examined palynologically. The cores were retrieved from the lower continental slope in the area of between 33.5° N and 8° N, off the West African coast. Most of the cores contain sediments from the last Glacial and Interglacial period. In some cases, the Holocene sediments are missing. Some individual cores contain sediments also from earlier Glacial and Interglacial periods. The main reason for making this palynological study was to find out the differences between the vegetation of Glacial and Interglacial periods in those parts of West Africa which at present belong to the Mediterranean zone, the Sahara and the zones of the savannas and tropical forests. In today's Mediterranean vegetation zone at core 33.5° N, forests and deciduous forests in particular, are missing during Glacial conditions. Semi-deserts are found instead of these. In the early isotope stage 1, there is a very significant development of forests which contain evergreen oaks; this is the Mediterranean type of vegestation development. The Sahara type of vegetation development is shown in four cores from between 27° N and 19° N. The differences between Glacial and Interglacial periods are very small. It must be assumed therefore that in this latitudes, both Glacial and Interglacial conditions gave rise to desert generally. The results are in favour of a slightly more arid climate during Glacial and more humid one during Interglacial periods. The southern boundary of the Sahara and the adjacent savannas with grassland and tropical woods were situated more to the south during the Glacial periods than they were during the Interglacial ones. In front of today's savanna belt, it can be seen from the palynological results that there are considerable differences between the vegetation of Glacial and Interglacial periods. The woods are more important in Interglacial periods. During the Glacial periods these are replaced from north to south decreasingly by grassland (savanna and ... Dataset Arktis Arktis* North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-18.930000,-9.408333,33.620000,7.701000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
ARKTIS 1993 East Atlantic GIK12309-3 GIK12310-4 GIK12329-6 GIK12392-1 KAL Kasten corer M12392-1 M25 M30 M30_184 M8_017-2 M8017B Meteor (1964) North Atlantic Ocean PC Piston corer SPC Sphincter corer VA132 VA132-18-1 Valdivia (1961) Westafrika 1973 |
spellingShingle |
ARKTIS 1993 East Atlantic GIK12309-3 GIK12310-4 GIK12329-6 GIK12392-1 KAL Kasten corer M12392-1 M25 M30 M30_184 M8_017-2 M8017B Meteor (1964) North Atlantic Ocean PC Piston corer SPC Sphincter corer VA132 VA132-18-1 Valdivia (1961) Westafrika 1973 Agwu, Chiori O C Beug, Hans-Jürgen Palynology of marine sediment cores from the West African coast |
topic_facet |
ARKTIS 1993 East Atlantic GIK12309-3 GIK12310-4 GIK12329-6 GIK12392-1 KAL Kasten corer M12392-1 M25 M30 M30_184 M8_017-2 M8017B Meteor (1964) North Atlantic Ocean PC Piston corer SPC Sphincter corer VA132 VA132-18-1 Valdivia (1961) Westafrika 1973 |
description |
Seven sediment cores from the cruises of the "Meteor" and "Valdivia" were examined palynologically. The cores were retrieved from the lower continental slope in the area of between 33.5° N and 8° N, off the West African coast. Most of the cores contain sediments from the last Glacial and Interglacial period. In some cases, the Holocene sediments are missing. Some individual cores contain sediments also from earlier Glacial and Interglacial periods. The main reason for making this palynological study was to find out the differences between the vegetation of Glacial and Interglacial periods in those parts of West Africa which at present belong to the Mediterranean zone, the Sahara and the zones of the savannas and tropical forests. In today's Mediterranean vegetation zone at core 33.5° N, forests and deciduous forests in particular, are missing during Glacial conditions. Semi-deserts are found instead of these. In the early isotope stage 1, there is a very significant development of forests which contain evergreen oaks; this is the Mediterranean type of vegestation development. The Sahara type of vegetation development is shown in four cores from between 27° N and 19° N. The differences between Glacial and Interglacial periods are very small. It must be assumed therefore that in this latitudes, both Glacial and Interglacial conditions gave rise to desert generally. The results are in favour of a slightly more arid climate during Glacial and more humid one during Interglacial periods. The southern boundary of the Sahara and the adjacent savannas with grassland and tropical woods were situated more to the south during the Glacial periods than they were during the Interglacial ones. In front of today's savanna belt, it can be seen from the palynological results that there are considerable differences between the vegetation of Glacial and Interglacial periods. The woods are more important in Interglacial periods. During the Glacial periods these are replaced from north to south decreasingly by grassland (savanna and ... |
format |
Dataset |
author |
Agwu, Chiori O C Beug, Hans-Jürgen |
author_facet |
Agwu, Chiori O C Beug, Hans-Jürgen |
author_sort |
Agwu, Chiori O C |
title |
Palynology of marine sediment cores from the West African coast |
title_short |
Palynology of marine sediment cores from the West African coast |
title_full |
Palynology of marine sediment cores from the West African coast |
title_fullStr |
Palynology of marine sediment cores from the West African coast |
title_full_unstemmed |
Palynology of marine sediment cores from the West African coast |
title_sort |
palynology of marine sediment cores from the west african coast |
publisher |
PANGAEA |
publishDate |
1982 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.548485 https://doi.org/10.1594/PANGAEA.548485 |
op_coverage |
MEDIAN LATITUDE: 21.176104 * MEDIAN LONGITUDE: -15.914186 * SOUTH-BOUND LATITUDE: 7.701000 * WEST-BOUND LONGITUDE: -18.930000 * NORTH-BOUND LATITUDE: 33.620000 * EAST-BOUND LONGITUDE: -9.408333 * DATE/TIME START: 1971-10-31T00:00:00 * DATE/TIME END: 1973-03-22T15:12:00 |
long_lat |
ENVELOPE(-18.930000,-9.408333,33.620000,7.701000) |
genre |
Arktis Arktis* North Atlantic |
genre_facet |
Arktis Arktis* North Atlantic |
op_source |
Supplement to: Agwu, Chiori O C; Beug, Hans-Jürgen (1982): Palynological studies of marine sediments off the West African coast. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C36, 1-30 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.548485 https://doi.org/10.1594/PANGAEA.548485 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.548485 |
_version_ |
1766355505422270464 |