Planktonic foraminifera in sediments of the Ibero-Moroccan Continental Margin
Recent clays cover the East Atlantic continental slopes. They are gray and poor in sand off Portugal (Cape Sines), but reddish brown to reddish gray and richer in sand off Morocco (Cape Mazagan). The majority of the 19 sediment cores, which were taken mainly on two profiles (Fig. 3), can be correlat...
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1971
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.548409 2024-09-15T18:24:28+00:00 Planktonic foraminifera in sediments of the Ibero-Moroccan Continental Margin Thiede, Jörn MEDIAN LATITUDE: 37.074986 * MEDIAN LONGITUDE: -9.963474 * SOUTH-BOUND LATITUDE: 33.620000 * WEST-BOUND LONGITUDE: -10.083000 * NORTH-BOUND LATITUDE: 37.750000 * EAST-BOUND LONGITUDE: -9.408333 * DATE/TIME START: 1967-02-07T06:30:00 * DATE/TIME END: 1967-02-07T10:54:00 1971 application/zip, 14 datasets https://doi.pangaea.de/10.1594/PANGAEA.548409 https://doi.org/10.1594/PANGAEA.548409 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.548409 https://doi.org/10.1594/PANGAEA.548409 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Thiede, Jörn (1971): Planktonische Foraminiferen in Sedimenten vom ibero-marokkanischen Kontinentalrand. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C7, 15-102 Atlantische Kuppenfahrten 1967/1-3 Cape Blanc/Meteor Bank/Portugal GIK/IfG Institute for Geosciences Christian Albrechts University Kiel KAL Kasten corer M8 M8_016-2 M8_017-2 M8_057-2 M8_058-2 M8_066-2 M8/16-2 M8016B M8017B M8057B M8058B M8066B Meteor (1964) North Atlantic Ocean dataset publication series 1971 ftpangaea https://doi.org/10.1594/PANGAEA.548409 2024-08-21T00:02:25Z Recent clays cover the East Atlantic continental slopes. They are gray and poor in sand off Portugal (Cape Sines), but reddish brown to reddish gray and richer in sand off Morocco (Cape Mazagan). The majority of the 19 sediment cores, which were taken mainly on two profiles (Fig. 3), can be correlated by means of planktonic foraminifera (Figs. 27, 28). The following parameters seem to be well suited for this purpose: qualitative and quantitative distribution of the planktonic foraminiferal species and faunas, coiling ratios of three Globorotalia-species: G. crassaformis, G. hirsuta and G. truncatulinoides. Sediments from about 2000 m water depth show highest sedimentation rates off Portugal (> 20 cm/1000 yrs.), but off Morocco the lowest sedimentation rates (about 3 cm/1000 yrs.). The sediments are dated with planktonic foraminifera and 31 radiocarbon analyses and the stratigraphic interpretation is supported by the lithostratigraphy. Holocene faunas are distinguished from the Pleistocene ones by differences in species composition, lower dominances and higher diversities. The Holocene sediments show smaller differences of the foraminiferal numbers than the Pleistocene ones. During Holocene and Pleistocene the temperatures of the surface water masses (indicated by the planktonic foraminiferal faunas) show similar values nearshore and offshore off Morocco. Likewise, there is no apparent temperature gradient in the Pleistocene off Portugal; whereas here values increase offshore during the Holocene. The proportion of species indicating warmer water masses is generally higher off Morocco. The plankton/benthos ratio increases with water depth and reaches maximum values already at about 1000 m. The production rate for planktonic foraminifera is higher in the continental slope regions than in the open ocean, but their shells show typical solution phenomena already in water depths of less than 1000 m. A higher solutional rate was found in sediments from the Tagus Abyssal Plain, while sediments from Horse Shoe and ... Other/Unknown Material North Atlantic Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-10.083000,-9.408333,37.750000,33.620000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Atlantische Kuppenfahrten 1967/1-3 Cape Blanc/Meteor Bank/Portugal GIK/IfG Institute for Geosciences Christian Albrechts University Kiel KAL Kasten corer M8 M8_016-2 M8_017-2 M8_057-2 M8_058-2 M8_066-2 M8/16-2 M8016B M8017B M8057B M8058B M8066B Meteor (1964) North Atlantic Ocean |
spellingShingle |
Atlantische Kuppenfahrten 1967/1-3 Cape Blanc/Meteor Bank/Portugal GIK/IfG Institute for Geosciences Christian Albrechts University Kiel KAL Kasten corer M8 M8_016-2 M8_017-2 M8_057-2 M8_058-2 M8_066-2 M8/16-2 M8016B M8017B M8057B M8058B M8066B Meteor (1964) North Atlantic Ocean Thiede, Jörn Planktonic foraminifera in sediments of the Ibero-Moroccan Continental Margin |
topic_facet |
Atlantische Kuppenfahrten 1967/1-3 Cape Blanc/Meteor Bank/Portugal GIK/IfG Institute for Geosciences Christian Albrechts University Kiel KAL Kasten corer M8 M8_016-2 M8_017-2 M8_057-2 M8_058-2 M8_066-2 M8/16-2 M8016B M8017B M8057B M8058B M8066B Meteor (1964) North Atlantic Ocean |
description |
Recent clays cover the East Atlantic continental slopes. They are gray and poor in sand off Portugal (Cape Sines), but reddish brown to reddish gray and richer in sand off Morocco (Cape Mazagan). The majority of the 19 sediment cores, which were taken mainly on two profiles (Fig. 3), can be correlated by means of planktonic foraminifera (Figs. 27, 28). The following parameters seem to be well suited for this purpose: qualitative and quantitative distribution of the planktonic foraminiferal species and faunas, coiling ratios of three Globorotalia-species: G. crassaformis, G. hirsuta and G. truncatulinoides. Sediments from about 2000 m water depth show highest sedimentation rates off Portugal (> 20 cm/1000 yrs.), but off Morocco the lowest sedimentation rates (about 3 cm/1000 yrs.). The sediments are dated with planktonic foraminifera and 31 radiocarbon analyses and the stratigraphic interpretation is supported by the lithostratigraphy. Holocene faunas are distinguished from the Pleistocene ones by differences in species composition, lower dominances and higher diversities. The Holocene sediments show smaller differences of the foraminiferal numbers than the Pleistocene ones. During Holocene and Pleistocene the temperatures of the surface water masses (indicated by the planktonic foraminiferal faunas) show similar values nearshore and offshore off Morocco. Likewise, there is no apparent temperature gradient in the Pleistocene off Portugal; whereas here values increase offshore during the Holocene. The proportion of species indicating warmer water masses is generally higher off Morocco. The plankton/benthos ratio increases with water depth and reaches maximum values already at about 1000 m. The production rate for planktonic foraminifera is higher in the continental slope regions than in the open ocean, but their shells show typical solution phenomena already in water depths of less than 1000 m. A higher solutional rate was found in sediments from the Tagus Abyssal Plain, while sediments from Horse Shoe and ... |
format |
Other/Unknown Material |
author |
Thiede, Jörn |
author_facet |
Thiede, Jörn |
author_sort |
Thiede, Jörn |
title |
Planktonic foraminifera in sediments of the Ibero-Moroccan Continental Margin |
title_short |
Planktonic foraminifera in sediments of the Ibero-Moroccan Continental Margin |
title_full |
Planktonic foraminifera in sediments of the Ibero-Moroccan Continental Margin |
title_fullStr |
Planktonic foraminifera in sediments of the Ibero-Moroccan Continental Margin |
title_full_unstemmed |
Planktonic foraminifera in sediments of the Ibero-Moroccan Continental Margin |
title_sort |
planktonic foraminifera in sediments of the ibero-moroccan continental margin |
publisher |
PANGAEA |
publishDate |
1971 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.548409 https://doi.org/10.1594/PANGAEA.548409 |
op_coverage |
MEDIAN LATITUDE: 37.074986 * MEDIAN LONGITUDE: -9.963474 * SOUTH-BOUND LATITUDE: 33.620000 * WEST-BOUND LONGITUDE: -10.083000 * NORTH-BOUND LATITUDE: 37.750000 * EAST-BOUND LONGITUDE: -9.408333 * DATE/TIME START: 1967-02-07T06:30:00 * DATE/TIME END: 1967-02-07T10:54:00 |
long_lat |
ENVELOPE(-10.083000,-9.408333,37.750000,33.620000) |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
Supplement to: Thiede, Jörn (1971): Planktonische Foraminiferen in Sedimenten vom ibero-marokkanischen Kontinentalrand. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C7, 15-102 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.548409 https://doi.org/10.1594/PANGAEA.548409 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.548409 |
_version_ |
1810464825736691712 |