A paleomagnetic record of the early Matuyama chron including the Réunion subchron and the onset Olduvai boundary: High-resolution magnetostratigraphy and insights from transitional geomagnetic fields
Abstract We present a novel paleomagnetic record for the lower Matuyama chronozone, which includes the Réunion subchronozone and the lower Olduvai polarity reversal, from a continuous section of a 168-m-thick on-land marine succession in the southernmost part of the Boso Peninsula, central Japan. In...
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Online Access: | https://dx.doi.org/10.6084/m9.figshare.c.5086671 https://springernature.figshare.com/collections/A_paleomagnetic_record_of_the_early_Matuyama_chron_including_the_R_union_subchron_and_the_onset_Olduvai_boundary_High-resolution_magnetostratigraphy_and_insights_from_transitional_geomagnetic_fields/5086671 |
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ftdatacite:10.6084/m9.figshare.c.5086671 2023-05-15T16:19:41+02:00 A paleomagnetic record of the early Matuyama chron including the Réunion subchron and the onset Olduvai boundary: High-resolution magnetostratigraphy and insights from transitional geomagnetic fields Konishi, Takumi Okada, Makoto 2020 https://dx.doi.org/10.6084/m9.figshare.c.5086671 https://springernature.figshare.com/collections/A_paleomagnetic_record_of_the_early_Matuyama_chron_including_the_R_union_subchron_and_the_onset_Olduvai_boundary_High-resolution_magnetostratigraphy_and_insights_from_transitional_geomagnetic_fields/5086671 unknown figshare https://dx.doi.org/10.1186/s40645-020-00352-0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Cell Biology Physiology FOS Biological sciences Evolutionary Biology Ecology Inorganic Chemistry FOS Chemical sciences Collection article 2020 ftdatacite https://doi.org/10.6084/m9.figshare.c.5086671 https://doi.org/10.1186/s40645-020-00352-0 2021-11-05T12:55:41Z Abstract We present a novel paleomagnetic record for the lower Matuyama chronozone, which includes the Réunion subchronozone and the lower Olduvai polarity reversal, from a continuous section of a 168-m-thick on-land marine succession in the southernmost part of the Boso Peninsula, central Japan. In this section, the Réunion subchronozone and the lower Olduvai reversal are observed at 38.6–44.6 m and 142.0 m, respectively. The average sedimentation rates between the lower and upper Réunion boundaries and between the upper Réunion boundary and lower Olduvai boundary are calculated as 25 cm/ky and 57 cm/ky, respectively. The virtual geomagnetic pole (VGP), observed in the Boso Peninsula, at both the upper and lower Réunion boundaries passed across the equator within a similar longitudinal band over Africa. Immediately below the upper boundary, between 43.0 and 43.5 m, the VGP settled in a cluster area around China. Relative paleointensity (RPI) values for the entire Réunion interval are generally lower than the average for the entire interval from the Réunion to the lower Olduvai subchronozone. Conversely, the VGP for the lower Olduvai reversal boundary did not pass across the equator within a narrow longitudinal band but settled in several cluster areas; i.e., the southern Indian Ocean, North America, and the southern South Pacific Ocean off South America. The VGP then moved rapidly between the clusters. The locations of VGP cluster areas in the lower Olduvai reversal seem to coincide with areas where a vertical component of the present geomagnetic non-axial dipole (NAD) field is dominant. During the reversal, the RPI declined rapidly and recovered slowly as the VGP moved rapidly between cluster areas. Our new paleomagnetic data are one of the most detailed records for those geomagnetic reversals from marine sediments, and will, therefore, help to understand the dynamics of the geomagnetic reversals. Article in Journal/Newspaper Geomagnetic Pole DataCite Metadata Store (German National Library of Science and Technology) Pacific Indian |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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ftdatacite |
language |
unknown |
topic |
Cell Biology Physiology FOS Biological sciences Evolutionary Biology Ecology Inorganic Chemistry FOS Chemical sciences |
spellingShingle |
Cell Biology Physiology FOS Biological sciences Evolutionary Biology Ecology Inorganic Chemistry FOS Chemical sciences Konishi, Takumi Okada, Makoto A paleomagnetic record of the early Matuyama chron including the Réunion subchron and the onset Olduvai boundary: High-resolution magnetostratigraphy and insights from transitional geomagnetic fields |
topic_facet |
Cell Biology Physiology FOS Biological sciences Evolutionary Biology Ecology Inorganic Chemistry FOS Chemical sciences |
description |
Abstract We present a novel paleomagnetic record for the lower Matuyama chronozone, which includes the Réunion subchronozone and the lower Olduvai polarity reversal, from a continuous section of a 168-m-thick on-land marine succession in the southernmost part of the Boso Peninsula, central Japan. In this section, the Réunion subchronozone and the lower Olduvai reversal are observed at 38.6–44.6 m and 142.0 m, respectively. The average sedimentation rates between the lower and upper Réunion boundaries and between the upper Réunion boundary and lower Olduvai boundary are calculated as 25 cm/ky and 57 cm/ky, respectively. The virtual geomagnetic pole (VGP), observed in the Boso Peninsula, at both the upper and lower Réunion boundaries passed across the equator within a similar longitudinal band over Africa. Immediately below the upper boundary, between 43.0 and 43.5 m, the VGP settled in a cluster area around China. Relative paleointensity (RPI) values for the entire Réunion interval are generally lower than the average for the entire interval from the Réunion to the lower Olduvai subchronozone. Conversely, the VGP for the lower Olduvai reversal boundary did not pass across the equator within a narrow longitudinal band but settled in several cluster areas; i.e., the southern Indian Ocean, North America, and the southern South Pacific Ocean off South America. The VGP then moved rapidly between the clusters. The locations of VGP cluster areas in the lower Olduvai reversal seem to coincide with areas where a vertical component of the present geomagnetic non-axial dipole (NAD) field is dominant. During the reversal, the RPI declined rapidly and recovered slowly as the VGP moved rapidly between cluster areas. Our new paleomagnetic data are one of the most detailed records for those geomagnetic reversals from marine sediments, and will, therefore, help to understand the dynamics of the geomagnetic reversals. |
format |
Article in Journal/Newspaper |
author |
Konishi, Takumi Okada, Makoto |
author_facet |
Konishi, Takumi Okada, Makoto |
author_sort |
Konishi, Takumi |
title |
A paleomagnetic record of the early Matuyama chron including the Réunion subchron and the onset Olduvai boundary: High-resolution magnetostratigraphy and insights from transitional geomagnetic fields |
title_short |
A paleomagnetic record of the early Matuyama chron including the Réunion subchron and the onset Olduvai boundary: High-resolution magnetostratigraphy and insights from transitional geomagnetic fields |
title_full |
A paleomagnetic record of the early Matuyama chron including the Réunion subchron and the onset Olduvai boundary: High-resolution magnetostratigraphy and insights from transitional geomagnetic fields |
title_fullStr |
A paleomagnetic record of the early Matuyama chron including the Réunion subchron and the onset Olduvai boundary: High-resolution magnetostratigraphy and insights from transitional geomagnetic fields |
title_full_unstemmed |
A paleomagnetic record of the early Matuyama chron including the Réunion subchron and the onset Olduvai boundary: High-resolution magnetostratigraphy and insights from transitional geomagnetic fields |
title_sort |
paleomagnetic record of the early matuyama chron including the réunion subchron and the onset olduvai boundary: high-resolution magnetostratigraphy and insights from transitional geomagnetic fields |
publisher |
figshare |
publishDate |
2020 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.5086671 https://springernature.figshare.com/collections/A_paleomagnetic_record_of_the_early_Matuyama_chron_including_the_R_union_subchron_and_the_onset_Olduvai_boundary_High-resolution_magnetostratigraphy_and_insights_from_transitional_geomagnetic_fields/5086671 |
geographic |
Pacific Indian |
geographic_facet |
Pacific Indian |
genre |
Geomagnetic Pole |
genre_facet |
Geomagnetic Pole |
op_relation |
https://dx.doi.org/10.1186/s40645-020-00352-0 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.5086671 https://doi.org/10.1186/s40645-020-00352-0 |
_version_ |
1766006092959055872 |