Geomagnetic paleosecular variation recorded in Plio-Pleistocene volcanic rocks from Possession Island (Crozet Archipelago, southern Indian Ocean)
International audience Possession Island, in the Crozet Archipelago, consists of volcanic units erupted mainly between ~5 and 0.5 Ma. A paleomagnetic sampling was carried out along several sections distributed near the northern, eastern, and southeastern coasts. A total of 45 independent flows were...
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Online Access: | https://hal.science/hal-00003976 https://hal.science/hal-00003976v2/document https://hal.science/hal-00003976v2/file/2000JB900370.pdf https://doi.org/10.1029/2000JB900370 |
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ftunimontpellier:oai:HAL:hal-00003976v2 2024-05-19T07:47:36+00:00 Geomagnetic paleosecular variation recorded in Plio-Pleistocene volcanic rocks from Possession Island (Crozet Archipelago, southern Indian Ocean) Camps, Pierre Henry, Bernard Prevot, Michel Faynot, Liliane Laboratoire Dynamique de la Lithosphère (LDL) Université Montpellier 2 - Sciences et Techniques (UM2)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 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) IPEV 2001 https://hal.science/hal-00003976 https://hal.science/hal-00003976v2/document https://hal.science/hal-00003976v2/file/2000JB900370.pdf https://doi.org/10.1029/2000JB900370 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2000JB900370 hal-00003976 https://hal.science/hal-00003976 https://hal.science/hal-00003976v2/document https://hal.science/hal-00003976v2/file/2000JB900370.pdf doi:10.1029/2000JB900370 info:eu-repo/semantics/OpenAccess ISSN: 2169-9313 EISSN: 2169-9356 Journal of Geophysical Research : Solid Earth https://hal.science/hal-00003976 Journal of Geophysical Research : Solid Earth, 2001, 106 (B2), pp.1961-1971. ⟨10.1029/2000JB900370⟩ lava flow Brunhes Matuyama paleomagnetism crozet archipelago [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2001 ftunimontpellier https://doi.org/10.1029/2000JB900370 2024-05-01T00:32:10Z International audience Possession Island, in the Crozet Archipelago, consists of volcanic units erupted mainly between ~5 and 0.5 Ma. A paleomagnetic sampling was carried out along several sections distributed near the northern, eastern, and southeastern coasts. A total of 45 independent flows were sampled (320 samples). For each flow a precisely defined characteristic remanence direction was usually isolated after a careful progressive cleaning in alternating fields. However, particularly complex remanence behavior is often observed. The magnetostratigraphy of the lava pile is quite simple, with reversed rocks in the lower part and normal units in the upper part of two sections. A third section is of normal polarity throughout its whole thickness, including three excursional directions. We did not find any intermediate directions between the normal and reverse magnetozones. Thus we have no evidence for the recording of the Matuyama-Brunhes transition expected from a previous study (Watkins, 1972). The amplitude of paleosecular variation, estimated from between-flow dispersion from the field of an axial dipole, is 11.8 with 95% confidence limits between 9.3 deg and 14.0 deg. This value is consistent with the general anisotropic statistical model for paleosecular variation of Constable and Johnson, 1999. Article in Journal/Newspaper Possession Island Université de Montpellier: HAL Journal of Geophysical Research: Solid Earth 106 B2 1961 1971 |
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Université de Montpellier: HAL |
op_collection_id |
ftunimontpellier |
language |
English |
topic |
lava flow Brunhes Matuyama paleomagnetism crozet archipelago [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
lava flow Brunhes Matuyama paleomagnetism crozet archipelago [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Camps, Pierre Henry, Bernard Prevot, Michel Faynot, Liliane Geomagnetic paleosecular variation recorded in Plio-Pleistocene volcanic rocks from Possession Island (Crozet Archipelago, southern Indian Ocean) |
topic_facet |
lava flow Brunhes Matuyama paleomagnetism crozet archipelago [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience Possession Island, in the Crozet Archipelago, consists of volcanic units erupted mainly between ~5 and 0.5 Ma. A paleomagnetic sampling was carried out along several sections distributed near the northern, eastern, and southeastern coasts. A total of 45 independent flows were sampled (320 samples). For each flow a precisely defined characteristic remanence direction was usually isolated after a careful progressive cleaning in alternating fields. However, particularly complex remanence behavior is often observed. The magnetostratigraphy of the lava pile is quite simple, with reversed rocks in the lower part and normal units in the upper part of two sections. A third section is of normal polarity throughout its whole thickness, including three excursional directions. We did not find any intermediate directions between the normal and reverse magnetozones. Thus we have no evidence for the recording of the Matuyama-Brunhes transition expected from a previous study (Watkins, 1972). The amplitude of paleosecular variation, estimated from between-flow dispersion from the field of an axial dipole, is 11.8 with 95% confidence limits between 9.3 deg and 14.0 deg. This value is consistent with the general anisotropic statistical model for paleosecular variation of Constable and Johnson, 1999. |
author2 |
Laboratoire Dynamique de la Lithosphère (LDL) Université Montpellier 2 - Sciences et Techniques (UM2)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 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) IPEV |
format |
Article in Journal/Newspaper |
author |
Camps, Pierre Henry, Bernard Prevot, Michel Faynot, Liliane |
author_facet |
Camps, Pierre Henry, Bernard Prevot, Michel Faynot, Liliane |
author_sort |
Camps, Pierre |
title |
Geomagnetic paleosecular variation recorded in Plio-Pleistocene volcanic rocks from Possession Island (Crozet Archipelago, southern Indian Ocean) |
title_short |
Geomagnetic paleosecular variation recorded in Plio-Pleistocene volcanic rocks from Possession Island (Crozet Archipelago, southern Indian Ocean) |
title_full |
Geomagnetic paleosecular variation recorded in Plio-Pleistocene volcanic rocks from Possession Island (Crozet Archipelago, southern Indian Ocean) |
title_fullStr |
Geomagnetic paleosecular variation recorded in Plio-Pleistocene volcanic rocks from Possession Island (Crozet Archipelago, southern Indian Ocean) |
title_full_unstemmed |
Geomagnetic paleosecular variation recorded in Plio-Pleistocene volcanic rocks from Possession Island (Crozet Archipelago, southern Indian Ocean) |
title_sort |
geomagnetic paleosecular variation recorded in plio-pleistocene volcanic rocks from possession island (crozet archipelago, southern indian ocean) |
publisher |
HAL CCSD |
publishDate |
2001 |
url |
https://hal.science/hal-00003976 https://hal.science/hal-00003976v2/document https://hal.science/hal-00003976v2/file/2000JB900370.pdf https://doi.org/10.1029/2000JB900370 |
genre |
Possession Island |
genre_facet |
Possession Island |
op_source |
ISSN: 2169-9313 EISSN: 2169-9356 Journal of Geophysical Research : Solid Earth https://hal.science/hal-00003976 Journal of Geophysical Research : Solid Earth, 2001, 106 (B2), pp.1961-1971. ⟨10.1029/2000JB900370⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2000JB900370 hal-00003976 https://hal.science/hal-00003976 https://hal.science/hal-00003976v2/document https://hal.science/hal-00003976v2/file/2000JB900370.pdf doi:10.1029/2000JB900370 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2000JB900370 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
106 |
container_issue |
B2 |
container_start_page |
1961 |
op_container_end_page |
1971 |
_version_ |
1799488051996524544 |