LA-ICP-MS Zircon U—Pb Dating of Acidic Tuff from the Eocene Akasaki Formation, Amakusa, Kumamoto Prefecture, Western Kyushu, Japan: Implications for the Age of the Land Mammal Fauna in Japan

Yuka Miyake; Yukiyasu Tsutsumi; Kazunori Miyata; Toshifumi Komatsu

doi:10.2517/2016PR001

Paleontological Research

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LA-ICP-MS Zircon U—Pb Dating of Acidic Tuff from the Eocene Akasaki Formation, Amakusa, Kumamoto Prefecture, Western Kyushu, Japan: Implications for the Age of the Land Mammal Fauna in Japan

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Authors: Yuka Miyake¹, Yukiyasu Tsutsumi², Kazunori Miyata^3,4, Toshifumi Komatsu¹

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Source: Paleontological Research Volume 20, Issue 4, 302 - 311 (Sat Oct 01 00:00:00 UTC 2016); http://dx.doi.org/10.2517/2016PR001

Publisher: UniBio Press

Abstract

Abstract.

We obtained zircon U—Pb ages using LA-ICP-MS for an acidic tuff bed in the upper part of the Akasaki Formation, a basal unit of the Eocene sequence in the Amakusa area, Kumamoto Prefecture, Japan. The U—Pb age of 49.1±0.4 Ma (95% confidence interval) suggests a late early Eocene age. Our result is important for biochronological assessment of the land mammal fauna of the Akasaki Formation. The new age date supports the correlation of the Akasaki mammal fauna with the Bridgerian North American Land Mammal Age.

DOI: http://dx.doi.org/10.2517/2016PR001

Received 16 1月 2015 Accepted 15 1月 2016

Acknowledgments:

We greatly thank G. F. Gunnell (Division of Fossil Primates, Duke Lemur Center, Durham, North Carolina, U.S.A.) for his critical comments and improving the early manuscript. Special thanks are due to the referees, H. Sano (Kyushu University) and Y. Orihashi (University of Tokyo). This study was financially supported by the Tokyo Geographical Society (to Miyake) and a Grant-in-Aid from the Japan Society for Promotion of Science (25400500 to Komatsu). The fieldwork by Miyata was partially supported by the Fujiwara Natural History Public Interest Incorporated Foundation in 2014.

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