Paleomagnetic direction and paleointensity variations during the Matuyama–Brunhes polarity transition from a marine succession in the Chiba composite section of the Boso Peninsula, central Japan
Abstract The youngest geomagnetic polarity reversal, the Matuyama–Brunhes (M–B) boundary, provides an important plane of data for sediments, ice cores, and lavas. The geomagnetic field intensity and directional changes that occurred during the reversal also provide important information for understa...
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Online Access: | https://dx.doi.org/10.6084/m9.figshare.c.3723040 https://figshare.com/collections/Paleomagnetic_direction_and_paleointensity_variations_during_the_Matuyama_Brunhes_polarity_transition_from_a_marine_succession_in_the_Chiba_composite_section_of_the_Boso_Peninsula_central_Japan/3723040 |
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ftdatacite:10.6084/m9.figshare.c.3723040 2023-05-15T16:39:27+02:00 Paleomagnetic direction and paleointensity variations during the Matuyama–Brunhes polarity transition from a marine succession in the Chiba composite section of the Boso Peninsula, central Japan Okada, Makoto Suganuma, Yusuke Haneda, Yuki Kazaoka, Osamu 2017 https://dx.doi.org/10.6084/m9.figshare.c.3723040 https://figshare.com/collections/Paleomagnetic_direction_and_paleointensity_variations_during_the_Matuyama_Brunhes_polarity_transition_from_a_marine_succession_in_the_Chiba_composite_section_of_the_Boso_Peninsula_central_Japan/3723040 unknown Figshare https://dx.doi.org/10.1186/s40623-017-0627-1 CC BY https://creativecommons.org/licenses/by/4.0 CC-BY Physiology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology 69999 Biological Sciences not elsewhere classified 80699 Information Systems not elsewhere classified FOS Computer and information sciences Marine Biology Inorganic Chemistry Collection article 2017 ftdatacite https://doi.org/10.6084/m9.figshare.c.3723040 https://doi.org/10.1186/s40623-017-0627-1 2021-11-05T12:55:41Z Abstract The youngest geomagnetic polarity reversal, the Matuyama–Brunhes (M–B) boundary, provides an important plane of data for sediments, ice cores, and lavas. The geomagnetic field intensity and directional changes that occurred during the reversal also provide important information for understanding the dynamics of the Earth’s outer core, which generates the magnetic field. However, the reversal process is relatively rapid in terms of the geological timescale; therefore, adequate temporal resolution of the geomagnetic field record is essential for addressing these topics. Here, we report a new high-resolution paleomagnetic record from a continuous marine succession in the Chiba composite section of the Kokumoto Formation of the Kazusa Group, Japan, that reveals detailed behaviors of the virtual geomagnetic poles (VGPs) and relative paleointensity changes during the M–B polarity transition. The resultant relative paleointensity and VGP records show a significant paleointensity minimum near the M–B boundary, which is accompanied by a clear “polarity switch.” A newly obtained high-resolution oxygen isotope chronology for the Chiba composite section indicates that the M–B boundary is located in the middle of marine isotope stage (MIS) 19 and yields an age of 771.7 ka for the boundary. This age is consistent with those based on the latest astronomically tuned marine and ice core records and with the recalculated age of 770.9 ± 7.3 ka deduced from the U–Pb zircon age of the Byk-E tephra. To the best of our knowledge, our new paleomagnetic data represent one of the most detailed records on this geomagnetic field reversal that has thus far been obtained from marine sediments and will therefore be key for understanding the dynamics of the geomagnetic dynamo and for calibrating the geological timescale. Graphical abstract . Article in Journal/Newspaper ice core DataCite Metadata Store (German National Library of Science and Technology) Byk ENVELOPE(52.240,52.240,65.752,65.752) |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Physiology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology 69999 Biological Sciences not elsewhere classified 80699 Information Systems not elsewhere classified FOS Computer and information sciences Marine Biology Inorganic Chemistry |
spellingShingle |
Physiology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology 69999 Biological Sciences not elsewhere classified 80699 Information Systems not elsewhere classified FOS Computer and information sciences Marine Biology Inorganic Chemistry Okada, Makoto Suganuma, Yusuke Haneda, Yuki Kazaoka, Osamu Paleomagnetic direction and paleointensity variations during the Matuyama–Brunhes polarity transition from a marine succession in the Chiba composite section of the Boso Peninsula, central Japan |
topic_facet |
Physiology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology 69999 Biological Sciences not elsewhere classified 80699 Information Systems not elsewhere classified FOS Computer and information sciences Marine Biology Inorganic Chemistry |
description |
Abstract The youngest geomagnetic polarity reversal, the Matuyama–Brunhes (M–B) boundary, provides an important plane of data for sediments, ice cores, and lavas. The geomagnetic field intensity and directional changes that occurred during the reversal also provide important information for understanding the dynamics of the Earth’s outer core, which generates the magnetic field. However, the reversal process is relatively rapid in terms of the geological timescale; therefore, adequate temporal resolution of the geomagnetic field record is essential for addressing these topics. Here, we report a new high-resolution paleomagnetic record from a continuous marine succession in the Chiba composite section of the Kokumoto Formation of the Kazusa Group, Japan, that reveals detailed behaviors of the virtual geomagnetic poles (VGPs) and relative paleointensity changes during the M–B polarity transition. The resultant relative paleointensity and VGP records show a significant paleointensity minimum near the M–B boundary, which is accompanied by a clear “polarity switch.” A newly obtained high-resolution oxygen isotope chronology for the Chiba composite section indicates that the M–B boundary is located in the middle of marine isotope stage (MIS) 19 and yields an age of 771.7 ka for the boundary. This age is consistent with those based on the latest astronomically tuned marine and ice core records and with the recalculated age of 770.9 ± 7.3 ka deduced from the U–Pb zircon age of the Byk-E tephra. To the best of our knowledge, our new paleomagnetic data represent one of the most detailed records on this geomagnetic field reversal that has thus far been obtained from marine sediments and will therefore be key for understanding the dynamics of the geomagnetic dynamo and for calibrating the geological timescale. Graphical abstract . |
format |
Article in Journal/Newspaper |
author |
Okada, Makoto Suganuma, Yusuke Haneda, Yuki Kazaoka, Osamu |
author_facet |
Okada, Makoto Suganuma, Yusuke Haneda, Yuki Kazaoka, Osamu |
author_sort |
Okada, Makoto |
title |
Paleomagnetic direction and paleointensity variations during the Matuyama–Brunhes polarity transition from a marine succession in the Chiba composite section of the Boso Peninsula, central Japan |
title_short |
Paleomagnetic direction and paleointensity variations during the Matuyama–Brunhes polarity transition from a marine succession in the Chiba composite section of the Boso Peninsula, central Japan |
title_full |
Paleomagnetic direction and paleointensity variations during the Matuyama–Brunhes polarity transition from a marine succession in the Chiba composite section of the Boso Peninsula, central Japan |
title_fullStr |
Paleomagnetic direction and paleointensity variations during the Matuyama–Brunhes polarity transition from a marine succession in the Chiba composite section of the Boso Peninsula, central Japan |
title_full_unstemmed |
Paleomagnetic direction and paleointensity variations during the Matuyama–Brunhes polarity transition from a marine succession in the Chiba composite section of the Boso Peninsula, central Japan |
title_sort |
paleomagnetic direction and paleointensity variations during the matuyama–brunhes polarity transition from a marine succession in the chiba composite section of the boso peninsula, central japan |
publisher |
Figshare |
publishDate |
2017 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.3723040 https://figshare.com/collections/Paleomagnetic_direction_and_paleointensity_variations_during_the_Matuyama_Brunhes_polarity_transition_from_a_marine_succession_in_the_Chiba_composite_section_of_the_Boso_Peninsula_central_Japan/3723040 |
long_lat |
ENVELOPE(52.240,52.240,65.752,65.752) |
geographic |
Byk |
geographic_facet |
Byk |
genre |
ice core |
genre_facet |
ice core |
op_relation |
https://dx.doi.org/10.1186/s40623-017-0627-1 |
op_rights |
CC BY https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.3723040 https://doi.org/10.1186/s40623-017-0627-1 |
_version_ |
1766029797694111744 |