Nd, Sr and Pb isotopes and clay minerals in sediment cores from the Gulf of Cadiz and the Portuguese margin

The assemblages of marine sediments on the SW Iberian shelf have been controlled by contributions from distinct sources, which have varied in response to environmental changes since the Last Glacial Maximum (LGM). The rapid, decadal scale Mediterranean overturning circulation permits mixing of suspe...

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Main Authors: Stumpf, Roland, Frank, Martin, Schönfeld, Joachim, Haley, Brian A
Format: Dataset
Language:English
Published: PANGAEA 2011
Subjects:
SL
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.774225
https://doi.org/10.1594/PANGAEA.774225
id ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.774225
record_format openpolar
spelling ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.774225 2023-05-15T17:37:02+02:00 Nd, Sr and Pb isotopes and clay minerals in sediment cores from the Gulf of Cadiz and the Portuguese margin Stumpf, Roland Frank, Martin Schönfeld, Joachim Haley, Brian A MEDIAN LATITUDE: 37.716333 * MEDIAN LONGITUDE: -8.929444 * SOUTH-BOUND LATITUDE: 36.380000 * WEST-BOUND LONGITUDE: -10.680000 * NORTH-BOUND LATITUDE: 39.040000 * EAST-BOUND LONGITUDE: -7.071667 * DATE/TIME START: 1997-04-24T14:30:00 * DATE/TIME END: 1997-05-04T18:14:00 2011-01-18 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.774225 https://doi.org/10.1594/PANGAEA.774225 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.774225 https://doi.org/10.1594/PANGAEA.774225 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Stumpf, Roland; Frank, Martin; Schönfeld, Joachim; Haley, Brian A (2011): Climatically driven changes in sediment supply on the SW Iberian shelf since the Last Glacial Maximum. Earth and Planetary Science Letters, 312(1-2), 80-90, https://doi.org/10.1016/j.epsl.2011.10.002 Gravity corer (Kiel type) M39/1 M39/1_08-3 M39/1_36-4 M39/1_58-2 M39008-3 M39058-2 Meteor (1986) SL Dataset 2011 ftpangaea https://doi.org/10.1594/PANGAEA.774225 https://doi.org/10.1016/j.epsl.2011.10.002 2023-01-20T07:32:23Z The assemblages of marine sediments on the SW Iberian shelf have been controlled by contributions from distinct sources, which have varied in response to environmental changes since the Last Glacial Maximum (LGM). The rapid, decadal scale Mediterranean overturning circulation permits mixing of suspended particles from the entire Mediterranean Sea. They are entrained into the suspended particulate matter (SPM) carried by Mediterranean Outflow Water (MOW), which enters the eastern North Atlantic through the Strait of Gibraltar and spreads at intermediate depths in the Gulf of Cadiz and along the Portuguese continental margin. Other major sediment sources that have contributed to the characteristics and budget of SPM along the flow path of MOW on the SW Iberian shelf are North African dust and river-transported particles from the Iberian Peninsula. To reconstruct climate- and circulation-driven changes in the supply of sediments over the past ~23000 cal yr B.P., radiogenic Nd, Sr and Pb isotope records of the clay-size sediment fraction were obtained from one gravity core in the Gulf of Cadiz (577 m water depth) and from two gravity cores on the Portuguese shelf (1745 m, 1974 m water depth). These records are supplemented by time series analyses of clay mineral abundances from the same set of samples. Contrary to expectations, the transition from the LGM to the Holocene was not accompanied by strong changes in sediment provenance or transport, whereas Heinrich Event 1 (H1) and the African Humid Period (AHP) were marked by significantly different isotopic signatures reflecting changes in source contributions caused by supply of ice rafted material originating from the North American craton during H1 and diminished supply of Saharan dust during the AHP. The data also reveal that the timing of variations in the clay mineral abundances was decoupled from that of the radiogenic isotope signatures. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-10.680000,-7.071667,39.040000,36.380000)
institution Open Polar
collection PANGAEA - Data Publisher for Earth & Environmental Science
op_collection_id ftpangaea
language English
topic Gravity corer (Kiel type)
M39/1
M39/1_08-3
M39/1_36-4
M39/1_58-2
M39008-3
M39058-2
Meteor (1986)
SL
spellingShingle Gravity corer (Kiel type)
M39/1
M39/1_08-3
M39/1_36-4
M39/1_58-2
M39008-3
M39058-2
Meteor (1986)
SL
Stumpf, Roland
Frank, Martin
Schönfeld, Joachim
Haley, Brian A
Nd, Sr and Pb isotopes and clay minerals in sediment cores from the Gulf of Cadiz and the Portuguese margin
topic_facet Gravity corer (Kiel type)
M39/1
M39/1_08-3
M39/1_36-4
M39/1_58-2
M39008-3
M39058-2
Meteor (1986)
SL
description The assemblages of marine sediments on the SW Iberian shelf have been controlled by contributions from distinct sources, which have varied in response to environmental changes since the Last Glacial Maximum (LGM). The rapid, decadal scale Mediterranean overturning circulation permits mixing of suspended particles from the entire Mediterranean Sea. They are entrained into the suspended particulate matter (SPM) carried by Mediterranean Outflow Water (MOW), which enters the eastern North Atlantic through the Strait of Gibraltar and spreads at intermediate depths in the Gulf of Cadiz and along the Portuguese continental margin. Other major sediment sources that have contributed to the characteristics and budget of SPM along the flow path of MOW on the SW Iberian shelf are North African dust and river-transported particles from the Iberian Peninsula. To reconstruct climate- and circulation-driven changes in the supply of sediments over the past ~23000 cal yr B.P., radiogenic Nd, Sr and Pb isotope records of the clay-size sediment fraction were obtained from one gravity core in the Gulf of Cadiz (577 m water depth) and from two gravity cores on the Portuguese shelf (1745 m, 1974 m water depth). These records are supplemented by time series analyses of clay mineral abundances from the same set of samples. Contrary to expectations, the transition from the LGM to the Holocene was not accompanied by strong changes in sediment provenance or transport, whereas Heinrich Event 1 (H1) and the African Humid Period (AHP) were marked by significantly different isotopic signatures reflecting changes in source contributions caused by supply of ice rafted material originating from the North American craton during H1 and diminished supply of Saharan dust during the AHP. The data also reveal that the timing of variations in the clay mineral abundances was decoupled from that of the radiogenic isotope signatures.
format Dataset
author Stumpf, Roland
Frank, Martin
Schönfeld, Joachim
Haley, Brian A
author_facet Stumpf, Roland
Frank, Martin
Schönfeld, Joachim
Haley, Brian A
author_sort Stumpf, Roland
title Nd, Sr and Pb isotopes and clay minerals in sediment cores from the Gulf of Cadiz and the Portuguese margin
title_short Nd, Sr and Pb isotopes and clay minerals in sediment cores from the Gulf of Cadiz and the Portuguese margin
title_full Nd, Sr and Pb isotopes and clay minerals in sediment cores from the Gulf of Cadiz and the Portuguese margin
title_fullStr Nd, Sr and Pb isotopes and clay minerals in sediment cores from the Gulf of Cadiz and the Portuguese margin
title_full_unstemmed Nd, Sr and Pb isotopes and clay minerals in sediment cores from the Gulf of Cadiz and the Portuguese margin
title_sort nd, sr and pb isotopes and clay minerals in sediment cores from the gulf of cadiz and the portuguese margin
publisher PANGAEA
publishDate 2011
url https://doi.pangaea.de/10.1594/PANGAEA.774225
https://doi.org/10.1594/PANGAEA.774225
op_coverage MEDIAN LATITUDE: 37.716333 * MEDIAN LONGITUDE: -8.929444 * SOUTH-BOUND LATITUDE: 36.380000 * WEST-BOUND LONGITUDE: -10.680000 * NORTH-BOUND LATITUDE: 39.040000 * EAST-BOUND LONGITUDE: -7.071667 * DATE/TIME START: 1997-04-24T14:30:00 * DATE/TIME END: 1997-05-04T18:14:00
long_lat ENVELOPE(-10.680000,-7.071667,39.040000,36.380000)
genre North Atlantic
genre_facet North Atlantic
op_source Supplement to: Stumpf, Roland; Frank, Martin; Schönfeld, Joachim; Haley, Brian A (2011): Climatically driven changes in sediment supply on the SW Iberian shelf since the Last Glacial Maximum. Earth and Planetary Science Letters, 312(1-2), 80-90, https://doi.org/10.1016/j.epsl.2011.10.002
op_relation https://doi.pangaea.de/10.1594/PANGAEA.774225
https://doi.org/10.1594/PANGAEA.774225
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.774225
https://doi.org/10.1016/j.epsl.2011.10.002
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