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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.
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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
Geochemical Journal, Vol. 55, No. , P. 185-191, 2021

ABSTRACT

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.

KEYWORDS

U-Pb dating, tuffaceous zircon, the Onnagawa Formation, the Middle-to-Late Miocene, NanoSIMS

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