X-ray fluorescence (XRF) scannings and grain size analysis at sites in the Gulf of Cádiz
Contourites in the Gulf of Cádiz preserve a unique archive of Mediterranean Outflow Water (MOW) variability over the past 5.3 Ma. In our study we investigate the potential of geochemical data obtained by XRF scanning to decipher bottom current processes and paleoclimatic evolution at two different s...
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2014
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.831133 https://doi.org/10.1594/PANGAEA.831133 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.831133 2024-09-15T18:10:03+00:00 X-ray fluorescence (XRF) scannings and grain size analysis at sites in the Gulf of Cádiz Bahr, André Jiménez-Espejo, Francisco Jose Kolasinac, Nada Grunert, Patrick Hernandéz-Molina, Francisco Javier Röhl, Ursula Voelker, Antje H L Escutia, Carlota Stow, Dorrik A V Alvarez Zarikian, Carlos A Hodell, David A MEDIAN LATITUDE: 36.852705 * MEDIAN LONGITUDE: -7.965292 * SOUTH-BOUND LATITUDE: 36.425000 * WEST-BOUND LONGITUDE: -10.134000 * NORTH-BOUND LATITUDE: 37.565000 * EAST-BOUND LONGITUDE: -7.277000 2014 application/zip, 8 datasets https://doi.pangaea.de/10.1594/PANGAEA.831133 https://doi.org/10.1594/PANGAEA.831133 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.831133 https://doi.org/10.1594/PANGAEA.831133 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Bahr, André; Jiménez-Espejo, Francisco Jose; Kolasinac, Nada; Grunert, Patrick; Hernandéz-Molina, Francisco Javier; Röhl, Ursula; Voelker, Antje H L; Escutia, Carlota; Stow, Dorrik A V; Alvarez Zarikian, Carlos A; Hodell, David A (2014): Deciphering bottom current strength and paleoclimate signals from contourite deposits in the Gulf of Cádiz during the last 140 kyr: an inorganic geochemical approach. Geochemistry, Geophysics, Geosystems, 15(8), 3145-3160, https://doi.org/10.1002/2014GC005356 Integrated Ocean Drilling Program / International Ocean Discovery Program IODP dataset publication series 2014 ftpangaea https://doi.org/10.1594/PANGAEA.83113310.1002/2014GC005356 2024-07-24T02:31:21Z Contourites in the Gulf of Cádiz preserve a unique archive of Mediterranean Outflow Water (MOW) variability over the past 5.3 Ma. In our study we investigate the potential of geochemical data obtained by XRF scanning to decipher bottom current processes and paleoclimatic evolution at two different sites drilled through contourite deposits in the northern Gulf of Cadiz: Site U1387, which is bathed by the upper MOW core, and Site U1389, located more proximal to the Straits of Gibraltar. The lack of major downslope transport at both locations during the Pleistocene makes them ideal locations for the purpose of our study. The results indicate that the Zr/Al ratio, representing the relative enrichment of heavy minerals (zircon) over less dense alumosilicates under strong bottom current flow, is the most useful indicator for a semi-quantitative assessment of current strength. While most elements are biased by current-related processes, the bromine record, representing organic content, preserves the most pristine climate signal rather independent of grain size changes. Hence, Br can be used for chronostratigraphy and site-to-site correlation in addition to stable isotope stratigraphy. Based on these findings we reconstructed MOW variability for Marine Isotope Stages 1-5 using the Zr/Al ratio from Site U1387. The results reveal abrupt, millennial-scale variations of MOW strength during Greenland Stadials (GS) and Interstadials (GI) with strong MOW during GS and glacial Terminations and a complex behavior during Heinrich Stadials. Millennial-scale variability persisting during periods of poorly expressed GS/GI cyclicities implies a strong internal oscillation of the Mediterranean/North Atlantic climate system. Other/Unknown Material Greenland North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-10.134000,-7.277000,37.565000,36.425000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Integrated Ocean Drilling Program / International Ocean Discovery Program IODP |
spellingShingle |
Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Bahr, André Jiménez-Espejo, Francisco Jose Kolasinac, Nada Grunert, Patrick Hernandéz-Molina, Francisco Javier Röhl, Ursula Voelker, Antje H L Escutia, Carlota Stow, Dorrik A V Alvarez Zarikian, Carlos A Hodell, David A X-ray fluorescence (XRF) scannings and grain size analysis at sites in the Gulf of Cádiz |
topic_facet |
Integrated Ocean Drilling Program / International Ocean Discovery Program IODP |
description |
Contourites in the Gulf of Cádiz preserve a unique archive of Mediterranean Outflow Water (MOW) variability over the past 5.3 Ma. In our study we investigate the potential of geochemical data obtained by XRF scanning to decipher bottom current processes and paleoclimatic evolution at two different sites drilled through contourite deposits in the northern Gulf of Cadiz: Site U1387, which is bathed by the upper MOW core, and Site U1389, located more proximal to the Straits of Gibraltar. The lack of major downslope transport at both locations during the Pleistocene makes them ideal locations for the purpose of our study. The results indicate that the Zr/Al ratio, representing the relative enrichment of heavy minerals (zircon) over less dense alumosilicates under strong bottom current flow, is the most useful indicator for a semi-quantitative assessment of current strength. While most elements are biased by current-related processes, the bromine record, representing organic content, preserves the most pristine climate signal rather independent of grain size changes. Hence, Br can be used for chronostratigraphy and site-to-site correlation in addition to stable isotope stratigraphy. Based on these findings we reconstructed MOW variability for Marine Isotope Stages 1-5 using the Zr/Al ratio from Site U1387. The results reveal abrupt, millennial-scale variations of MOW strength during Greenland Stadials (GS) and Interstadials (GI) with strong MOW during GS and glacial Terminations and a complex behavior during Heinrich Stadials. Millennial-scale variability persisting during periods of poorly expressed GS/GI cyclicities implies a strong internal oscillation of the Mediterranean/North Atlantic climate system. |
format |
Other/Unknown Material |
author |
Bahr, André Jiménez-Espejo, Francisco Jose Kolasinac, Nada Grunert, Patrick Hernandéz-Molina, Francisco Javier Röhl, Ursula Voelker, Antje H L Escutia, Carlota Stow, Dorrik A V Alvarez Zarikian, Carlos A Hodell, David A |
author_facet |
Bahr, André Jiménez-Espejo, Francisco Jose Kolasinac, Nada Grunert, Patrick Hernandéz-Molina, Francisco Javier Röhl, Ursula Voelker, Antje H L Escutia, Carlota Stow, Dorrik A V Alvarez Zarikian, Carlos A Hodell, David A |
author_sort |
Bahr, André |
title |
X-ray fluorescence (XRF) scannings and grain size analysis at sites in the Gulf of Cádiz |
title_short |
X-ray fluorescence (XRF) scannings and grain size analysis at sites in the Gulf of Cádiz |
title_full |
X-ray fluorescence (XRF) scannings and grain size analysis at sites in the Gulf of Cádiz |
title_fullStr |
X-ray fluorescence (XRF) scannings and grain size analysis at sites in the Gulf of Cádiz |
title_full_unstemmed |
X-ray fluorescence (XRF) scannings and grain size analysis at sites in the Gulf of Cádiz |
title_sort |
x-ray fluorescence (xrf) scannings and grain size analysis at sites in the gulf of cádiz |
publisher |
PANGAEA |
publishDate |
2014 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.831133 https://doi.org/10.1594/PANGAEA.831133 |
op_coverage |
MEDIAN LATITUDE: 36.852705 * MEDIAN LONGITUDE: -7.965292 * SOUTH-BOUND LATITUDE: 36.425000 * WEST-BOUND LONGITUDE: -10.134000 * NORTH-BOUND LATITUDE: 37.565000 * EAST-BOUND LONGITUDE: -7.277000 |
long_lat |
ENVELOPE(-10.134000,-7.277000,37.565000,36.425000) |
genre |
Greenland North Atlantic |
genre_facet |
Greenland North Atlantic |
op_source |
Supplement to: Bahr, André; Jiménez-Espejo, Francisco Jose; Kolasinac, Nada; Grunert, Patrick; Hernandéz-Molina, Francisco Javier; Röhl, Ursula; Voelker, Antje H L; Escutia, Carlota; Stow, Dorrik A V; Alvarez Zarikian, Carlos A; Hodell, David A (2014): Deciphering bottom current strength and paleoclimate signals from contourite deposits in the Gulf of Cádiz during the last 140 kyr: an inorganic geochemical approach. Geochemistry, Geophysics, Geosystems, 15(8), 3145-3160, https://doi.org/10.1002/2014GC005356 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.831133 https://doi.org/10.1594/PANGAEA.831133 |
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.83113310.1002/2014GC005356 |
_version_ |
1810447659178131456 |