A centennial-resolution terrestrial climatostratigraphy and Matuyama–Brunhes transition record from a loess sequence in China
Abstract Terrestrial records of the last geomagnetic reversal often have few age constraints. Chronostratigraphy using suborbital-scale paleoceanic events during marine isotope stage 19 may contribute to solving this problem. We applied the method to an 8 m long, high-resolution paleomagnetic record...
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doaj-005067f2e46541e29a7693ffc6aeb0b32020-11-25T03:08:46ZengSpringerOpenProgress in Earth and Planetary Science2197-42842020-06-017111810.1186/s40645-020-00337-zA centennial-resolution terrestrial climatostratigraphy and Matuyama–Brunhes transition record from a loess sequence in ChinaMasayuki Hyodo0Kenta Banjo1Tianshui Yang2Shigehiro Katoh3Meinan Shi4Yuki Yasuda5Jun-ichi Fukuda6Masako Miki7Balázs Bradák8Research Center for Inland Seas, Kobe UniversityDepartment of Planetology, Kobe UniversitySchool of Earth Sciences and Resources, China University of GeosciencesMuseum of Nature and Human ActivitiesSchool of Ocean Sciences, China University of GeosciencesResearch Center for Inland Seas, Kobe UniversityResearch Center for Inland Seas, Kobe UniversityDepartment of Planetology, Kobe UniversityInstitute of Seismology and Volcanology, Hokkaido UniversityAbstract Terrestrial records of the last geomagnetic reversal often have few age constraints. Chronostratigraphy using suborbital-scale paleoceanic events during marine isotope stage 19 may contribute to solving this problem. We applied the method to an 8 m long, high-resolution paleomagnetic record from a loess sequence in China and revealed millennial-to-sub-centennial scale features of the Matuyama–Brunhes (MB) transition. All samples were subjected to progressive thermal demagnetization with 14–15 steps up to 650–680 °C. As a result, 96% of the samples yielded a high-quality remanent magnetization. The MB transition terminated with a 75 cm thick zone with nine polarity flips. The polarity flip zone, dated at about 779–777 ka, began between the warm events “I” and “J” and terminated at the end of the cooling event coincident with the lowest axial-dipole strength interval. Most polarity flips occurred within 70 years. The virtual geomagnetic poles (VGPs) in the upper polarity flip zone clustered in the SW Pacific region, where the MB transitional VGPs from lavas of the Hawaiian and Canary Islands and lacustrine deposits of Java also clustered. These sites were probably dominated by dipolar fields. The absence of transitional fields across polarity flips implies a short time span for averaging fields due to a thin loess-magnetization lock-in zone. The reverse-to-normal polarity reversal dated at about 778 ka in Lingtai occurred at the end of the SW Pacific VGP zone, an important key bed for MB transition stratigraphy. The reversal is a good candidate for the main MB boundary. We found an excursion at about 766 ka spanning about 1 ka.http://link.springer.com/article/10.1186/s40645-020-00337-zLoess–paleosolGeomagnetic reversalEarly–Middle Pleistocene transitionLoess magnetismEast Asian monsoon |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Masayuki Hyodo Kenta Banjo Tianshui Yang Shigehiro Katoh Meinan Shi Yuki Yasuda Jun-ichi Fukuda Masako Miki Balázs Bradák |
spellingShingle |
Masayuki Hyodo Kenta Banjo Tianshui Yang Shigehiro Katoh Meinan Shi Yuki Yasuda Jun-ichi Fukuda Masako Miki Balázs Bradák A centennial-resolution terrestrial climatostratigraphy and Matuyama–Brunhes transition record from a loess sequence in China Progress in Earth and Planetary Science Loess–paleosol Geomagnetic reversal Early–Middle Pleistocene transition Loess magnetism East Asian monsoon |
author_facet |
Masayuki Hyodo Kenta Banjo Tianshui Yang Shigehiro Katoh Meinan Shi Yuki Yasuda Jun-ichi Fukuda Masako Miki Balázs Bradák |
author_sort |
Masayuki Hyodo |
title |
A centennial-resolution terrestrial climatostratigraphy and Matuyama–Brunhes transition record from a loess sequence in China |
title_short |
A centennial-resolution terrestrial climatostratigraphy and Matuyama–Brunhes transition record from a loess sequence in China |
title_full |
A centennial-resolution terrestrial climatostratigraphy and Matuyama–Brunhes transition record from a loess sequence in China |
title_fullStr |
A centennial-resolution terrestrial climatostratigraphy and Matuyama–Brunhes transition record from a loess sequence in China |
title_full_unstemmed |
A centennial-resolution terrestrial climatostratigraphy and Matuyama–Brunhes transition record from a loess sequence in China |
title_sort |
centennial-resolution terrestrial climatostratigraphy and matuyama–brunhes transition record from a loess sequence in china |
publisher |
SpringerOpen |
series |
Progress in Earth and Planetary Science |
issn |
2197-4284 |
publishDate |
2020-06-01 |
description |
Abstract Terrestrial records of the last geomagnetic reversal often have few age constraints. Chronostratigraphy using suborbital-scale paleoceanic events during marine isotope stage 19 may contribute to solving this problem. We applied the method to an 8 m long, high-resolution paleomagnetic record from a loess sequence in China and revealed millennial-to-sub-centennial scale features of the Matuyama–Brunhes (MB) transition. All samples were subjected to progressive thermal demagnetization with 14–15 steps up to 650–680 °C. As a result, 96% of the samples yielded a high-quality remanent magnetization. The MB transition terminated with a 75 cm thick zone with nine polarity flips. The polarity flip zone, dated at about 779–777 ka, began between the warm events “I” and “J” and terminated at the end of the cooling event coincident with the lowest axial-dipole strength interval. Most polarity flips occurred within 70 years. The virtual geomagnetic poles (VGPs) in the upper polarity flip zone clustered in the SW Pacific region, where the MB transitional VGPs from lavas of the Hawaiian and Canary Islands and lacustrine deposits of Java also clustered. These sites were probably dominated by dipolar fields. The absence of transitional fields across polarity flips implies a short time span for averaging fields due to a thin loess-magnetization lock-in zone. The reverse-to-normal polarity reversal dated at about 778 ka in Lingtai occurred at the end of the SW Pacific VGP zone, an important key bed for MB transition stratigraphy. The reversal is a good candidate for the main MB boundary. We found an excursion at about 766 ka spanning about 1 ka. |
topic |
Loess–paleosol Geomagnetic reversal Early–Middle Pleistocene transition Loess magnetism East Asian monsoon |
url |
http://link.springer.com/article/10.1186/s40645-020-00337-z |
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