Zircon U-Pb dating of a tuff layer from the Miocene Onnagawa Formation in Northern Japan

Jumpei Yoshioka; Junichiro Kuroda; Naoto Takahata; Yuji Sano; Kenji M. Matsuzaki; Hidetoshi Hara; Gerald Auer; Shun Chiyonobu; Ryuji Tada

doi:10.2343/geochemj.2.0622

Notes

Zircon U-Pb dating of a tuff layer from the Miocene Onnagawa Formation in Northern Japan

Jumpei Yoshioka , Junichiro Kuroda, Naoto Takahata, Yuji Sano, Kenji M. Matsuzaki, Hidetoshi Hara, Gerald Auer, Shun Chiyonobu, Ryuji Tada

著者情報

Jumpei Yoshioka [日本] 責任著者
Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan [日本]
Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan [日本]
Junichiro Kuroda [日本]
Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan [日本]
Naoto Takahata [日本]
Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan [日本]
Yuji Sano [日本]
Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan [日本]
Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China [中国]
Kenji M. Matsuzaki [日本]
Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan [日本]
Hidetoshi Hara [日本]
Geological Survey of Japan, AIST, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan [日本]
Gerald Auer
Institute of Earth Sciences, University of Graz, NAWI Graz Geocenter, Heinrichstrasse 26, 8010 Graz, Austria [オーストリア]
Shun Chiyonobu [日本]
Faculty of International Resource Sciences, Akita University, 1-1 Tegatagakuenmachi, Akita, Akita 010-8502, Japan [日本]
Ryuji Tada [日本]
Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan [日本]
The Research Center of Earth System Science, Yunnan University, Chenggong District, Kunming, Yunnan 650500, China [中国]
Institute for Geo-Cosmology, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan [日本]

キーワード: U-Pb dating, tuffaceous zircon, the Onnagawa Formation, the Middle-to-Late Miocene, NanoSIMS

ジャーナルフリー

2021 年 55 巻 3 号 p. 185-191

DOI https://doi.org/10.2343/geochemj.2.0622

詳細

抄録

During the Middle-to-Late Miocene, diatomaceous sediments were deposited in the North Pacific margin and marginal basins. The Onnagawa Formation is one of such deposits, which shows cyclic sedimentary rhythms reflecting oscillations of the marine environment in the Japan Sea. However, the age of the Onnagawa Formation is still poorly constrained due to the poor preservation of siliceous microfossils. To better constrain its age, we performed U-Pb dating of zircon grains from a tuff layer from the middle part of the Onnagawa Formation, and obtained an age of 11.18 ± 0.37 Ma. By combining our data with previously reported radiolarian biostratigraphy from the same section, we improved the age model of the diagenetically altered and lithified sediments of the Onnagawa Formation.

責任著者(Corresponding author)

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