BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN
Online ISSN : 2186-490X
Print ISSN : 1346-4272
ISSN-L : 1346-4272
Report
Radiometric age of a newly recognized Quaternary volcano: Naramata caldera, NE Japan.
Takahiro Yamamoto
Author information
JOURNAL FREE ACCESS

2014 Volume 65 Issue 9-10 Pages 113-116

Details
Abstract

In 2009, it was decided to make the Quaternary with its base at approximately 2.6 million years ago. Corresponding to this revision, Geological Survey of Japan, AIST has published VOLCANOES OF JAPAN (third edition), including Gelasian volcanoes (Nakano et al., 2013). Naramata caldera, which is located in the northeastern part of the Gunma Prefecture, NE Japan, is one of such volcanoes. This caldera is made up of rhyolitic pyroclastics and overlying lacustrine sediments filling a depression 2 km in diameter. Fission-track age of zircons from rhyolitic pyroclastics was determined as 2.1±0.2 Ma.

Content from these authors
© 2014 National Institute of Advanced Industrial Science and Technology, Geological Survey of Japan
Previous article Next article
feedback
Top