The Matuyama-Brunhes geomagnetic reversal from two deep-sea cores of the Eastern Equatorial Atlantic
International audience Matuyama-Brunhes geomagnetic polarity transitions recorded in Holes 659C and 664D, cored with the hydraulic piston corer during Ocean Drilling Program Leg 108, were selected for detailed study. The sections containing the reversals, as identified by shipboard results, were sam...
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HAL CCSD
1989
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ftunivnantes:oai:HAL:hal-03560151v1 2023-05-15T16:19:39+02:00 The Matuyama-Brunhes geomagnetic reversal from two deep-sea cores of the Eastern Equatorial Atlantic Valet, Jean-Pierre Tauxe, Lisa Bloemendal, Jan Centre des Faibles Radioactivités Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS) Scripps Institution of Oceanography (SIO - UC San Diego) University of California San Diego (UC San Diego) University of California (UC)-University of California (UC) University of Rhode Island (URI) 1989-12 https://hal.archives-ouvertes.fr/hal-03560151 https://hal.archives-ouvertes.fr/hal-03560151/document https://hal.archives-ouvertes.fr/hal-03560151/file/sr108_27.pdf https://doi.org/10.2973/odp.proc.sr.108.156.1989 en eng HAL CCSD Ocean Drilling Program info:eu-repo/semantics/altIdentifier/doi/10.2973/odp.proc.sr.108.156.1989 hal-03560151 https://hal.archives-ouvertes.fr/hal-03560151 https://hal.archives-ouvertes.fr/hal-03560151/document https://hal.archives-ouvertes.fr/hal-03560151/file/sr108_27.pdf doi:10.2973/odp.proc.sr.108.156.1989 info:eu-repo/semantics/OpenAccess Proceedings of the Ocean Drilling Program, 108 Scientific Results https://hal.archives-ouvertes.fr/hal-03560151 Proceedings of the Ocean Drilling Program, 108 Scientific Results, Ocean Drilling Program, 1989, ⟨10.2973/odp.proc.sr.108.156.1989⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/bookPart Book sections 1989 ftunivnantes https://doi.org/10.2973/odp.proc.sr.108.156.1989 2022-12-07T00:45:02Z International audience Matuyama-Brunhes geomagnetic polarity transitions recorded in Holes 659C and 664D, cored with the hydraulic piston corer during Ocean Drilling Program Leg 108, were selected for detailed study. The sections containing the reversals, as identified by shipboard results, were sampled using "U" channels. Few intermediate polarity directions were obtained from Hole 659C; consequently, no interpretation of this record in terms of transitional field behavior was attempted. However, the record from Hole 664D, located at the equator, is characterized by a gradual easterly progression of the declination from reverse to normal polarity and no deviation of the inclination from a mean value of 0°. The field intensity was reduced to about 20% of its pretransitional value. The absence of inclination changes combined with easterly declinations constrains the Virtual Geomagnetic Pole path to lie along the meridian 90° to the east. Such behavior does not resemble transitional field models, which neglect nonzonal terms. A comparison of this record with other reliable records shows that the behavior of the geomagnetic field during this reversal cannot be explained by a model involving a simple field geometry. Book Part Geomagnetic Pole Université de Nantes: HAL-UNIV-NANTES |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Valet, Jean-Pierre Tauxe, Lisa Bloemendal, Jan The Matuyama-Brunhes geomagnetic reversal from two deep-sea cores of the Eastern Equatorial Atlantic |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Matuyama-Brunhes geomagnetic polarity transitions recorded in Holes 659C and 664D, cored with the hydraulic piston corer during Ocean Drilling Program Leg 108, were selected for detailed study. The sections containing the reversals, as identified by shipboard results, were sampled using "U" channels. Few intermediate polarity directions were obtained from Hole 659C; consequently, no interpretation of this record in terms of transitional field behavior was attempted. However, the record from Hole 664D, located at the equator, is characterized by a gradual easterly progression of the declination from reverse to normal polarity and no deviation of the inclination from a mean value of 0°. The field intensity was reduced to about 20% of its pretransitional value. The absence of inclination changes combined with easterly declinations constrains the Virtual Geomagnetic Pole path to lie along the meridian 90° to the east. Such behavior does not resemble transitional field models, which neglect nonzonal terms. A comparison of this record with other reliable records shows that the behavior of the geomagnetic field during this reversal cannot be explained by a model involving a simple field geometry. |
author2 |
Centre des Faibles Radioactivités Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS) Scripps Institution of Oceanography (SIO - UC San Diego) University of California San Diego (UC San Diego) University of California (UC)-University of California (UC) University of Rhode Island (URI) |
format |
Book Part |
author |
Valet, Jean-Pierre Tauxe, Lisa Bloemendal, Jan |
author_facet |
Valet, Jean-Pierre Tauxe, Lisa Bloemendal, Jan |
author_sort |
Valet, Jean-Pierre |
title |
The Matuyama-Brunhes geomagnetic reversal from two deep-sea cores of the Eastern Equatorial Atlantic |
title_short |
The Matuyama-Brunhes geomagnetic reversal from two deep-sea cores of the Eastern Equatorial Atlantic |
title_full |
The Matuyama-Brunhes geomagnetic reversal from two deep-sea cores of the Eastern Equatorial Atlantic |
title_fullStr |
The Matuyama-Brunhes geomagnetic reversal from two deep-sea cores of the Eastern Equatorial Atlantic |
title_full_unstemmed |
The Matuyama-Brunhes geomagnetic reversal from two deep-sea cores of the Eastern Equatorial Atlantic |
title_sort |
matuyama-brunhes geomagnetic reversal from two deep-sea cores of the eastern equatorial atlantic |
publisher |
HAL CCSD |
publishDate |
1989 |
url |
https://hal.archives-ouvertes.fr/hal-03560151 https://hal.archives-ouvertes.fr/hal-03560151/document https://hal.archives-ouvertes.fr/hal-03560151/file/sr108_27.pdf https://doi.org/10.2973/odp.proc.sr.108.156.1989 |
genre |
Geomagnetic Pole |
genre_facet |
Geomagnetic Pole |
op_source |
Proceedings of the Ocean Drilling Program, 108 Scientific Results https://hal.archives-ouvertes.fr/hal-03560151 Proceedings of the Ocean Drilling Program, 108 Scientific Results, Ocean Drilling Program, 1989, ⟨10.2973/odp.proc.sr.108.156.1989⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.2973/odp.proc.sr.108.156.1989 hal-03560151 https://hal.archives-ouvertes.fr/hal-03560151 https://hal.archives-ouvertes.fr/hal-03560151/document https://hal.archives-ouvertes.fr/hal-03560151/file/sr108_27.pdf doi:10.2973/odp.proc.sr.108.156.1989 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.2973/odp.proc.sr.108.156.1989 |
_version_ |
1766006068699201536 |