Cyclostratigraphy of the Late Miocene to Pliocene sediments at IODP sites U1425 and U1430 in the Japan Sea and paleoceanographic implications
Abstract High-resolution studies of sedimentary sequences have reconstructed paleoceanographic changes in the Atlantic and southern and equatorial Pacific Oceans during the Late Miocene and Pliocene, but comparable analyses are lacking for the North Pacific Ocean. However, continuous samples of hemi...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2019-01-01
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| Series: | Progress in Earth and Planetary Science |
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| Online Access: | http://link.springer.com/article/10.1186/s40645-018-0250-1 |
| _version_ | 1818601446379094016 |
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| author | Shunsuke Kurokawa Ryuji Tada Kenji M. Matsuzaki Tomohisa Irino Lofi Johanna |
| author_facet | Shunsuke Kurokawa Ryuji Tada Kenji M. Matsuzaki Tomohisa Irino Lofi Johanna |
| author_sort | Shunsuke Kurokawa |
| collection | DOAJ |
| description | Abstract High-resolution studies of sedimentary sequences have reconstructed paleoceanographic changes in the Atlantic and southern and equatorial Pacific Oceans during the Late Miocene and Pliocene, but comparable analyses are lacking for the North Pacific Ocean. However, continuous samples of hemipelagic sequences covering this time interval were obtained at Integrated Ocean Drilling Program sites U1425 and U1430 in the Japan Sea during expedition 346. Because the paleoceanography of the Japan Sea was sensitive to glacio-eustatic sea-level changes, changes in the sediment record are manifested as cyclic lithological changes. By using a gamma ray attenuation (GRA) density, which reflects biogenic silica content, as an indicator of sea-level changes, we developed an independent orbitally tuned chronology at each site to construct high-resolution, high-precision age models for the time span of 11.8 to 1.45 Ma. First, the 405-kyr-filtered GRA profile at each site was tuned to 405-kyr-filtered orbital eccentricity. Then, using the 405-kyr-tuned age model, the 100-kyr-filtered GRA profile was tuned to short-eccentricity cycles to adjust the 405-kyr-tuned age models. We used the resulting age models to revise the time intervals of previously published lithological units and paleoceanographic stages for the Japan Sea. Our profiles based on physical properties are a good match to the oxygen isotope record, except for 6.6–3.6 Ma, a time interval with small-amplitude fluctuations in the oxygen isotope record. |
| first_indexed | 2024-12-16T12:51:31Z |
| format | Article |
| id | doaj.art-be7f55e0cbdf41d5923f70c80e260a87 |
| institution | Directory Open Access Journal |
| issn | 2197-4284 |
| language | English |
| last_indexed | 2024-12-16T12:51:31Z |
| publishDate | 2019-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Progress in Earth and Planetary Science |
| spelling | doaj.art-be7f55e0cbdf41d5923f70c80e260a872022-12-21T22:31:09ZengSpringerOpenProgress in Earth and Planetary Science2197-42842019-01-016112010.1186/s40645-018-0250-1Cyclostratigraphy of the Late Miocene to Pliocene sediments at IODP sites U1425 and U1430 in the Japan Sea and paleoceanographic implicationsShunsuke Kurokawa0Ryuji Tada1Kenji M. Matsuzaki2Tomohisa Irino3Lofi Johanna4Department of Earth and Planetary Science, Graduate School of Science, The University of TokyoDepartment of Earth and Planetary Science, Graduate School of Science, The University of TokyoDepartment of Earth and Planetary Science, Graduate School of Science, The University of TokyoGraduate School of Environmental Earth Science, Hokkaido UniversityGéosciences Montpellier, Université Montpellier IIAbstract High-resolution studies of sedimentary sequences have reconstructed paleoceanographic changes in the Atlantic and southern and equatorial Pacific Oceans during the Late Miocene and Pliocene, but comparable analyses are lacking for the North Pacific Ocean. However, continuous samples of hemipelagic sequences covering this time interval were obtained at Integrated Ocean Drilling Program sites U1425 and U1430 in the Japan Sea during expedition 346. Because the paleoceanography of the Japan Sea was sensitive to glacio-eustatic sea-level changes, changes in the sediment record are manifested as cyclic lithological changes. By using a gamma ray attenuation (GRA) density, which reflects biogenic silica content, as an indicator of sea-level changes, we developed an independent orbitally tuned chronology at each site to construct high-resolution, high-precision age models for the time span of 11.8 to 1.45 Ma. First, the 405-kyr-filtered GRA profile at each site was tuned to 405-kyr-filtered orbital eccentricity. Then, using the 405-kyr-tuned age model, the 100-kyr-filtered GRA profile was tuned to short-eccentricity cycles to adjust the 405-kyr-tuned age models. We used the resulting age models to revise the time intervals of previously published lithological units and paleoceanographic stages for the Japan Sea. Our profiles based on physical properties are a good match to the oxygen isotope record, except for 6.6–3.6 Ma, a time interval with small-amplitude fluctuations in the oxygen isotope record.http://link.springer.com/article/10.1186/s40645-018-0250-1IODPJapan SeaU1425U1430PlioceneLate Miocene |
| spellingShingle | Shunsuke Kurokawa Ryuji Tada Kenji M. Matsuzaki Tomohisa Irino Lofi Johanna Cyclostratigraphy of the Late Miocene to Pliocene sediments at IODP sites U1425 and U1430 in the Japan Sea and paleoceanographic implications Progress in Earth and Planetary Science IODP Japan Sea U1425 U1430 Pliocene Late Miocene |
| title | Cyclostratigraphy of the Late Miocene to Pliocene sediments at IODP sites U1425 and U1430 in the Japan Sea and paleoceanographic implications |
| title_full | Cyclostratigraphy of the Late Miocene to Pliocene sediments at IODP sites U1425 and U1430 in the Japan Sea and paleoceanographic implications |
| title_fullStr | Cyclostratigraphy of the Late Miocene to Pliocene sediments at IODP sites U1425 and U1430 in the Japan Sea and paleoceanographic implications |
| title_full_unstemmed | Cyclostratigraphy of the Late Miocene to Pliocene sediments at IODP sites U1425 and U1430 in the Japan Sea and paleoceanographic implications |
| title_short | Cyclostratigraphy of the Late Miocene to Pliocene sediments at IODP sites U1425 and U1430 in the Japan Sea and paleoceanographic implications |
| title_sort | cyclostratigraphy of the late miocene to pliocene sediments at iodp sites u1425 and u1430 in the japan sea and paleoceanographic implications |
| topic | IODP Japan Sea U1425 U1430 Pliocene Late Miocene |
| url | http://link.springer.com/article/10.1186/s40645-018-0250-1 |
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