Isotopic and magnetic provenance characterization of distal IRD in the Galicia Interior Basin (NW Iberia)
The sediments of the Galicia Interior Basin in NW Iberia Margin are of particular palaeoclimatic interest as they are located at the boundary where the climatic oscillations of the glacial interval were interrupted by extreme events such as Heinrich events. These events are well characterized in Nor...
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ftria:oai:ria.ua.pt:10773/15594 2023-05-15T16:03:52+02:00 Isotopic and magnetic provenance characterization of distal IRD in the Galicia Interior Basin (NW Iberia) Plaza Morlote, M. Rey, D. Santos, J. F. Ribeiro, S. Bernabeu, A. M. Mohamed, K. J. Heslop, D. Rubio, B. Martins, V. 2016-04 http://hdl.handle.net/10773/15594 eng eng Copernicus http://meetingorganizer.copernicus.org/EGU2016/posters/20040 1029-7006 1607-7962 http://hdl.handle.net/10773/15594 openAccess NW Iberia Margin Heinrich events Core CI12PC3 IRD conferenceObject 2016 ftria 2022-05-25T18:34:56Z The sediments of the Galicia Interior Basin in NW Iberia Margin are of particular palaeoclimatic interest as they are located at the boundary where the climatic oscillations of the glacial interval were interrupted by extreme events such as Heinrich events. These events are well characterized in Northern North Atlantic areas, but little is known about their occurrence beyond the Ruddiman belt. This study presents a combined environmagnetic and geochemical approach to the provenance and characterization of distal ice-rafted detritus (IRD) that occurred during the last glacial period in core CI12PC3 from the Galicia Interior Basin. The last six Heinrich Layers were identified by their magneto-mineralogical and geochemical properties. Their Sr and Nd isotopic signatures indicated that the Laurentide Ice Sheet was the major source for HL1, HL2, HL4 and HL5. However, the European ice sheets also influenced the initial development stages of HL1, HL2, HL4. HL3, HL6 and partially HL1, HL2 and HL4 were influenced by more juvenile provinces, such as Iceland/Faroes sheets and/or by the Fram Strait/East Greenland nearby areas. Separate provenance analyses of the coarse and fine fractions in the studied Heinrich Layers also indicated that IRDs and glacial flour sources might not always be the same. Our results shed unequivocal evidence that Canadian-sourced distal IRD are preceded by European-sourced IRD, at least from the H4. In our view, LIS and EIS instabilities registered in the Iberian Margin respond to the same climate forcing at different velocities. Conference Object East Greenland Faroes Fram Strait Greenland Ice Sheet Iceland North Atlantic Repositório Institucional da Universidade de Aveiro (RIA) Greenland |
institution |
Open Polar |
collection |
Repositório Institucional da Universidade de Aveiro (RIA) |
op_collection_id |
ftria |
language |
English |
topic |
NW Iberia Margin Heinrich events Core CI12PC3 IRD |
spellingShingle |
NW Iberia Margin Heinrich events Core CI12PC3 IRD Plaza Morlote, M. Rey, D. Santos, J. F. Ribeiro, S. Bernabeu, A. M. Mohamed, K. J. Heslop, D. Rubio, B. Martins, V. Isotopic and magnetic provenance characterization of distal IRD in the Galicia Interior Basin (NW Iberia) |
topic_facet |
NW Iberia Margin Heinrich events Core CI12PC3 IRD |
description |
The sediments of the Galicia Interior Basin in NW Iberia Margin are of particular palaeoclimatic interest as they are located at the boundary where the climatic oscillations of the glacial interval were interrupted by extreme events such as Heinrich events. These events are well characterized in Northern North Atlantic areas, but little is known about their occurrence beyond the Ruddiman belt. This study presents a combined environmagnetic and geochemical approach to the provenance and characterization of distal ice-rafted detritus (IRD) that occurred during the last glacial period in core CI12PC3 from the Galicia Interior Basin. The last six Heinrich Layers were identified by their magneto-mineralogical and geochemical properties. Their Sr and Nd isotopic signatures indicated that the Laurentide Ice Sheet was the major source for HL1, HL2, HL4 and HL5. However, the European ice sheets also influenced the initial development stages of HL1, HL2, HL4. HL3, HL6 and partially HL1, HL2 and HL4 were influenced by more juvenile provinces, such as Iceland/Faroes sheets and/or by the Fram Strait/East Greenland nearby areas. Separate provenance analyses of the coarse and fine fractions in the studied Heinrich Layers also indicated that IRDs and glacial flour sources might not always be the same. Our results shed unequivocal evidence that Canadian-sourced distal IRD are preceded by European-sourced IRD, at least from the H4. In our view, LIS and EIS instabilities registered in the Iberian Margin respond to the same climate forcing at different velocities. |
format |
Conference Object |
author |
Plaza Morlote, M. Rey, D. Santos, J. F. Ribeiro, S. Bernabeu, A. M. Mohamed, K. J. Heslop, D. Rubio, B. Martins, V. |
author_facet |
Plaza Morlote, M. Rey, D. Santos, J. F. Ribeiro, S. Bernabeu, A. M. Mohamed, K. J. Heslop, D. Rubio, B. Martins, V. |
author_sort |
Plaza Morlote, M. |
title |
Isotopic and magnetic provenance characterization of distal IRD in the Galicia Interior Basin (NW Iberia) |
title_short |
Isotopic and magnetic provenance characterization of distal IRD in the Galicia Interior Basin (NW Iberia) |
title_full |
Isotopic and magnetic provenance characterization of distal IRD in the Galicia Interior Basin (NW Iberia) |
title_fullStr |
Isotopic and magnetic provenance characterization of distal IRD in the Galicia Interior Basin (NW Iberia) |
title_full_unstemmed |
Isotopic and magnetic provenance characterization of distal IRD in the Galicia Interior Basin (NW Iberia) |
title_sort |
isotopic and magnetic provenance characterization of distal ird in the galicia interior basin (nw iberia) |
publisher |
Copernicus |
publishDate |
2016 |
url |
http://hdl.handle.net/10773/15594 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Faroes Fram Strait Greenland Ice Sheet Iceland North Atlantic |
genre_facet |
East Greenland Faroes Fram Strait Greenland Ice Sheet Iceland North Atlantic |
op_relation |
http://meetingorganizer.copernicus.org/EGU2016/posters/20040 1029-7006 1607-7962 http://hdl.handle.net/10773/15594 |
op_rights |
openAccess |
_version_ |
1766399555864100864 |