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

被引：4
|
作者：
Miyake, Yuka [1 ]
Tsutsumi, Yukiyasu [2 ]
Miyata, Kazunori [3 ,4 ]
Komatsu, Toshifumi [1 ]
机构：
[1] Kumamoto Univ, Grad Sch Sci & Technol, Dept Earth & Environm, 2-39-1,Kurokami, Kumamoto 8608555, Japan
[2] Natl Museum Nat & Sci, Dept Geol & Paleontol, 4-1-1 Amakubo, Tsukuba, Ibaraki 3050005, Japan
[3] Fukui Prefectural Univ, Inst Dinosaur Res, Fukui 9101195, Japan
[4] Fukui Prefectural Dinosaur Museum, 51-11 Terao, Fukui 9118601, Japan
来源：
PALEONTOLOGICAL RESEARCH | 2016年 / 20卷 / 04期
关键词：
Akasaki Formation; Arshantan; Bridgerian; Eocene; U-Pb age; zircon; EVOLUTION; COMPLEX;
D O I：
10.2517/2016PR001
中图分类号：
Q91 [古生物学];
学科分类号：
0709 ; 070903 ;
摘要：
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.
引用
收藏
页码：302 / 311
页数：10
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