scholarly journals Fission track ages of volcanic ash layers of the Kazusa Group in the Boso Peninsula, central Japan.

1996 ◽  
Vol 102 (6) ◽  
pp. 545-556 ◽  
Author(s):  
Mahito Watanabe ◽  
Tohru Danhara
Keyword(s):  
Volcanic Ash ◽  
Fission Track ◽  
Central Japan ◽  
Boso Peninsula ◽  
Fission Track Ages

Fission-Track Ages of Tuff Layers Related to the Pliocene-Pleistocene Boundary on the Boso Peninsula, Japan

1990 ◽  
Vol 33 (1) ◽  
pp. 86-93 ◽  
Author(s):  
Masao Kasuya
Keyword(s):  
Fission Track ◽  
Middle Part ◽  
Late Cenozoic ◽  
Boso Peninsula ◽  
Normal Polarity ◽  
Fission Track Ages ◽  
Age Constraints

AbstractFission-track ages of zircon crystals from four tuff layers in the late Cenozoic sediment sequence of the Boso Peninsula,.Japan, are 1.6 ± 0.2 myr (the Kurotaki Formation), 5.5 ± 0.6 and 5.2 ± 0.5 myr (the uppermost part of the Amatsu Formation), and 11.5 ± 0.8 myr (the middle part of the Amatsu Formation). These ages provide numerical age constraints on magneto-biostratigraphy. The normal polarity interval in the lower part of the Kiwada Formation corresponds to the Olduvai polarity subzone. The boundary between the Pliocene and Pleistocene lies slightly above the Olduvai polarity subzone.

scholarly journals Fission Track Ages of Several Quaternary Tephras in Kanto and Chubu Regions, Central Japan.

1998 ◽  
Vol 107 (3) ◽  
pp. 348-367 ◽  
Author(s):  
Takehiko SUZUKI ◽  
Osamu FUJIWARA ◽  
Tohru DANHARA
Keyword(s):  
Fission Track ◽  
Central Japan ◽  
Fission Track Ages
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