A detailed paleomagnetic record between 2.1 and 2.75 Ma at IODP Site U1314 in the North Atlantic: Geomagnetic excursions and the Gauss-Matuyama transition
International audience This study investigated the detailed geomagnetic field variation between 2.1 and 2.75 Ma from a sediment core (IODP Site U1314) with high sedimentation rate (≥10 cm/kyr) and good age control. Characteristic remanent magnetization directions were well resolved by stepwise alter...
Published in: | Geochemistry Geophysics Geosystems |
---|---|
Main Authors: | , , , , , , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2012
|
Subjects: | |
Online Access: | https://hal-insu.archives-ouvertes.fr/insu-03583351 https://hal-insu.archives-ouvertes.fr/insu-03583351/document https://hal-insu.archives-ouvertes.fr/insu-03583351/file/Geochem%20Geophys%20Geosyst%20-%202012%20-%20Ohno%20-%20A%20detailed%20paleomagnetic%20record%20between%202%201%20and%202%2075%20Ma%20at%20IODP%20Site%20U1314%20in%20the.pdf https://doi.org/10.1029/2012GC004080 |
id |
ftinsu:oai:HAL:insu-03583351v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:insu-03583351v1 2023-06-18T03:42:05+02:00 A detailed paleomagnetic record between 2.1 and 2.75 Ma at IODP Site U1314 in the North Atlantic: Geomagnetic excursions and the Gauss-Matuyama transition Ohno, Masao Hayashi, Tatsuya Komatsu, Fumiki Murakami, Fumi Zhao, Meng Guyodo, Yohan Acton, Gary Evans, Helen F. Kanamatsu, Toshiya Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) 2012 https://hal-insu.archives-ouvertes.fr/insu-03583351 https://hal-insu.archives-ouvertes.fr/insu-03583351/document https://hal-insu.archives-ouvertes.fr/insu-03583351/file/Geochem%20Geophys%20Geosyst%20-%202012%20-%20Ohno%20-%20A%20detailed%20paleomagnetic%20record%20between%202%201%20and%202%2075%20Ma%20at%20IODP%20Site%20U1314%20in%20the.pdf https://doi.org/10.1029/2012GC004080 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1029/2012GC004080 insu-03583351 https://hal-insu.archives-ouvertes.fr/insu-03583351 https://hal-insu.archives-ouvertes.fr/insu-03583351/document https://hal-insu.archives-ouvertes.fr/insu-03583351/file/Geochem%20Geophys%20Geosyst%20-%202012%20-%20Ohno%20-%20A%20detailed%20paleomagnetic%20record%20between%202%201%20and%202%2075%20Ma%20at%20IODP%20Site%20U1314%20in%20the.pdf BIBCODE: 2012GGG.1312Z39O doi:10.1029/2012GC004080 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal-insu.archives-ouvertes.fr/insu-03583351 Geochemistry, Geophysics, Geosystems, 2012, 13, p. 410-432. ⟨10.1029/2012GC004080⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2012 ftinsu https://doi.org/10.1029/2012GC004080 2023-06-05T20:51:38Z International audience This study investigated the detailed geomagnetic field variation between 2.1 and 2.75 Ma from a sediment core (IODP Site U1314) with high sedimentation rate (≥10 cm/kyr) and good age control. Characteristic remanent magnetization directions were well resolved by stepwise alternating field demagnetization. As a proxy of relative paleointensity, natural remanent magnetization (NRM) normalized by anhysteretic remanent magnetization (ARM) was used after testing that the influence of magnetic interaction in ARM is negligible. As a result, the following features of the geomagnetic field in the studied period have been revealed. During the transition of the Gauss-Matuyama (G-M) reversal and the Réunion Subchron, the paleointensity decreased to the value lower than 20% of the average intensity in the whole studied interval. In addition to these lows, eight paleointensity lows were found associated with large directional changes that satisfy the definition of a geomagnetic excursion. Four of these have ages close to ages reported for geomagnetic excursions in prior studies, whereas the other four excursions have not previously been observed. In our results, we confirm that the G-M transition occurred in marine isotope stage 103 even if we consider the shift in depth due to the lock-in process of magnetic particles. The temporal variation in paleointensity showed asymmetric behavior associated with the G-M transition, with a gradual decrease prior to the transition and a rapid recovery after the transition. Article in Journal/Newspaper North Atlantic Institut national des sciences de l'Univers: HAL-INSU Geochemistry Geophysics Geosystems 13 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Ohno, Masao Hayashi, Tatsuya Komatsu, Fumiki Murakami, Fumi Zhao, Meng Guyodo, Yohan Acton, Gary Evans, Helen F. Kanamatsu, Toshiya A detailed paleomagnetic record between 2.1 and 2.75 Ma at IODP Site U1314 in the North Atlantic: Geomagnetic excursions and the Gauss-Matuyama transition |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience This study investigated the detailed geomagnetic field variation between 2.1 and 2.75 Ma from a sediment core (IODP Site U1314) with high sedimentation rate (≥10 cm/kyr) and good age control. Characteristic remanent magnetization directions were well resolved by stepwise alternating field demagnetization. As a proxy of relative paleointensity, natural remanent magnetization (NRM) normalized by anhysteretic remanent magnetization (ARM) was used after testing that the influence of magnetic interaction in ARM is negligible. As a result, the following features of the geomagnetic field in the studied period have been revealed. During the transition of the Gauss-Matuyama (G-M) reversal and the Réunion Subchron, the paleointensity decreased to the value lower than 20% of the average intensity in the whole studied interval. In addition to these lows, eight paleointensity lows were found associated with large directional changes that satisfy the definition of a geomagnetic excursion. Four of these have ages close to ages reported for geomagnetic excursions in prior studies, whereas the other four excursions have not previously been observed. In our results, we confirm that the G-M transition occurred in marine isotope stage 103 even if we consider the shift in depth due to the lock-in process of magnetic particles. The temporal variation in paleointensity showed asymmetric behavior associated with the G-M transition, with a gradual decrease prior to the transition and a rapid recovery after the transition. |
author2 |
Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Ohno, Masao Hayashi, Tatsuya Komatsu, Fumiki Murakami, Fumi Zhao, Meng Guyodo, Yohan Acton, Gary Evans, Helen F. Kanamatsu, Toshiya |
author_facet |
Ohno, Masao Hayashi, Tatsuya Komatsu, Fumiki Murakami, Fumi Zhao, Meng Guyodo, Yohan Acton, Gary Evans, Helen F. Kanamatsu, Toshiya |
author_sort |
Ohno, Masao |
title |
A detailed paleomagnetic record between 2.1 and 2.75 Ma at IODP Site U1314 in the North Atlantic: Geomagnetic excursions and the Gauss-Matuyama transition |
title_short |
A detailed paleomagnetic record between 2.1 and 2.75 Ma at IODP Site U1314 in the North Atlantic: Geomagnetic excursions and the Gauss-Matuyama transition |
title_full |
A detailed paleomagnetic record between 2.1 and 2.75 Ma at IODP Site U1314 in the North Atlantic: Geomagnetic excursions and the Gauss-Matuyama transition |
title_fullStr |
A detailed paleomagnetic record between 2.1 and 2.75 Ma at IODP Site U1314 in the North Atlantic: Geomagnetic excursions and the Gauss-Matuyama transition |
title_full_unstemmed |
A detailed paleomagnetic record between 2.1 and 2.75 Ma at IODP Site U1314 in the North Atlantic: Geomagnetic excursions and the Gauss-Matuyama transition |
title_sort |
detailed paleomagnetic record between 2.1 and 2.75 ma at iodp site u1314 in the north atlantic: geomagnetic excursions and the gauss-matuyama transition |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03583351 https://hal-insu.archives-ouvertes.fr/insu-03583351/document https://hal-insu.archives-ouvertes.fr/insu-03583351/file/Geochem%20Geophys%20Geosyst%20-%202012%20-%20Ohno%20-%20A%20detailed%20paleomagnetic%20record%20between%202%201%20and%202%2075%20Ma%20at%20IODP%20Site%20U1314%20in%20the.pdf https://doi.org/10.1029/2012GC004080 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal-insu.archives-ouvertes.fr/insu-03583351 Geochemistry, Geophysics, Geosystems, 2012, 13, p. 410-432. ⟨10.1029/2012GC004080⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2012GC004080 insu-03583351 https://hal-insu.archives-ouvertes.fr/insu-03583351 https://hal-insu.archives-ouvertes.fr/insu-03583351/document https://hal-insu.archives-ouvertes.fr/insu-03583351/file/Geochem%20Geophys%20Geosyst%20-%202012%20-%20Ohno%20-%20A%20detailed%20paleomagnetic%20record%20between%202%201%20and%202%2075%20Ma%20at%20IODP%20Site%20U1314%20in%20the.pdf BIBCODE: 2012GGG.1312Z39O doi:10.1029/2012GC004080 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2012GC004080 |
container_title |
Geochemistry Geophysics Geosystems |
container_volume |
13 |
_version_ |
1769007884001083392 |