Pliocene integrated chronostratigraphy from the Anno Formation, Awa Group, Boso Peninsula, central Japan, and its paleoceanographic implications
Abstract The Pliocene climate is one of the best analogs for the climate of a globally warmer future. Here, we present a new Pliocene integrated chronostratigraphy from the Anno Formation in the uppermost Awa Group, which is distributed throughout the Boso Peninsula, central Japan, based on paleomag...
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ftdoajarticles:oai:doaj.org/article:10b471013c5e41b2ab788f5576be9084 2023-05-15T17:48:12+02:00 Pliocene integrated chronostratigraphy from the Anno Formation, Awa Group, Boso Peninsula, central Japan, and its paleoceanographic implications Yuki Haneda Makoto Okada 2019-01-01T00:00:00Z https://doi.org/10.1186/s40645-018-0248-8 https://doaj.org/article/10b471013c5e41b2ab788f5576be9084 EN eng SpringerOpen http://link.springer.com/article/10.1186/s40645-018-0248-8 https://doaj.org/toc/2197-4284 doi:10.1186/s40645-018-0248-8 2197-4284 https://doaj.org/article/10b471013c5e41b2ab788f5576be9084 Progress in Earth and Planetary Science, Vol 6, Iss 1, Pp 1-17 (2019) Awa Group Anno Formation Oxygen isotope stratigraphy Magnetostratigraphy Pliocene Geography. Anthropology. Recreation G Geology QE1-996.5 article 2019 ftdoajarticles https://doi.org/10.1186/s40645-018-0248-8 2022-12-31T16:21:14Z Abstract The Pliocene climate is one of the best analogs for the climate of a globally warmer future. Here, we present a new Pliocene integrated chronostratigraphy from the Anno Formation in the uppermost Awa Group, which is distributed throughout the Boso Peninsula, central Japan, based on paleomagnetic and benthic foraminiferal oxygen isotope records. This new chronostratigraphy provides valuable constraints for paleoceanographic and paleoclimatic studies in the northwestern Pacific Ocean, where the number of paleoceanographic records is limited due to the lack of calcareous microfossils from deep-sea sediment cores, with the exception of some plateaus at water depths above the calcite compensation depth (CCD). Paleomagnetic results indicate that the Anno Formation corresponds to the period extending from the Nunivak normal polarity subchronozone (4.493–4.631 Ma) to Chron C2An.2n (3.116–3.207 Ma), which is just above the Mammoth reversed polarity subchronozone. Although foraminifera are not found in the middle Anno Formation, our oxygen isotope records from the upper and lower Anno Formation demonstrate the recording of glacial–interglacial cycles. However, the amplitude of our δ18O profile is much larger than that of the LR04 stack, with similar to slightly lower glacial values and much lower interglacial values. This observation implies that the bottom water had lower δ18O values and/or a warmer water mass during interglacials compared with global average deep-water regions. Article in Journal/Newspaper Nunivak Directory of Open Access Journals: DOAJ Articles Pacific Progress in Earth and Planetary Science 6 1 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Awa Group Anno Formation Oxygen isotope stratigraphy Magnetostratigraphy Pliocene Geography. Anthropology. Recreation G Geology QE1-996.5 |
spellingShingle |
Awa Group Anno Formation Oxygen isotope stratigraphy Magnetostratigraphy Pliocene Geography. Anthropology. Recreation G Geology QE1-996.5 Yuki Haneda Makoto Okada Pliocene integrated chronostratigraphy from the Anno Formation, Awa Group, Boso Peninsula, central Japan, and its paleoceanographic implications |
topic_facet |
Awa Group Anno Formation Oxygen isotope stratigraphy Magnetostratigraphy Pliocene Geography. Anthropology. Recreation G Geology QE1-996.5 |
description |
Abstract The Pliocene climate is one of the best analogs for the climate of a globally warmer future. Here, we present a new Pliocene integrated chronostratigraphy from the Anno Formation in the uppermost Awa Group, which is distributed throughout the Boso Peninsula, central Japan, based on paleomagnetic and benthic foraminiferal oxygen isotope records. This new chronostratigraphy provides valuable constraints for paleoceanographic and paleoclimatic studies in the northwestern Pacific Ocean, where the number of paleoceanographic records is limited due to the lack of calcareous microfossils from deep-sea sediment cores, with the exception of some plateaus at water depths above the calcite compensation depth (CCD). Paleomagnetic results indicate that the Anno Formation corresponds to the period extending from the Nunivak normal polarity subchronozone (4.493–4.631 Ma) to Chron C2An.2n (3.116–3.207 Ma), which is just above the Mammoth reversed polarity subchronozone. Although foraminifera are not found in the middle Anno Formation, our oxygen isotope records from the upper and lower Anno Formation demonstrate the recording of glacial–interglacial cycles. However, the amplitude of our δ18O profile is much larger than that of the LR04 stack, with similar to slightly lower glacial values and much lower interglacial values. This observation implies that the bottom water had lower δ18O values and/or a warmer water mass during interglacials compared with global average deep-water regions. |
format |
Article in Journal/Newspaper |
author |
Yuki Haneda Makoto Okada |
author_facet |
Yuki Haneda Makoto Okada |
author_sort |
Yuki Haneda |
title |
Pliocene integrated chronostratigraphy from the Anno Formation, Awa Group, Boso Peninsula, central Japan, and its paleoceanographic implications |
title_short |
Pliocene integrated chronostratigraphy from the Anno Formation, Awa Group, Boso Peninsula, central Japan, and its paleoceanographic implications |
title_full |
Pliocene integrated chronostratigraphy from the Anno Formation, Awa Group, Boso Peninsula, central Japan, and its paleoceanographic implications |
title_fullStr |
Pliocene integrated chronostratigraphy from the Anno Formation, Awa Group, Boso Peninsula, central Japan, and its paleoceanographic implications |
title_full_unstemmed |
Pliocene integrated chronostratigraphy from the Anno Formation, Awa Group, Boso Peninsula, central Japan, and its paleoceanographic implications |
title_sort |
pliocene integrated chronostratigraphy from the anno formation, awa group, boso peninsula, central japan, and its paleoceanographic implications |
publisher |
SpringerOpen |
publishDate |
2019 |
url |
https://doi.org/10.1186/s40645-018-0248-8 https://doaj.org/article/10b471013c5e41b2ab788f5576be9084 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Nunivak |
genre_facet |
Nunivak |
op_source |
Progress in Earth and Planetary Science, Vol 6, Iss 1, Pp 1-17 (2019) |
op_relation |
http://link.springer.com/article/10.1186/s40645-018-0248-8 https://doaj.org/toc/2197-4284 doi:10.1186/s40645-018-0248-8 2197-4284 https://doaj.org/article/10b471013c5e41b2ab788f5576be9084 |
op_doi |
https://doi.org/10.1186/s40645-018-0248-8 |
container_title |
Progress in Earth and Planetary Science |
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6 |
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1 |
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1766153460276789248 |