資源地質
Online ISSN : 2185-4033
Print ISSN : 0918-2454
短報
足尾流紋岩質火砕岩類のジルコンU-Pb 年代と全岩K-Ar年代
石原 舜三折橋 裕二
著者情報
ジャーナル フリー

2013 年 63 巻 3 号 p. 149-152

詳細
抄録

U-Pb age of zircon separated from the Ashio rhyolitic welded tuff was determined, and whole-rock K-Ar ages with different alteration degrees were also dated. The U-Pb age of zircon in the least altered tuff was determined to have 10.25±0.16 Ma, and its whole-rock K-Ar age was dated at 11.3±0.4 Ma. This Miocene age seems to be the youngest among the major rhyolitic activities in the Oya-Ashio mine region; the youngest one brought up the largest amount of copper production in Japan toward the Ashio mine.

著者関連情報
© 2013 資源地質学会
前の記事 次の記事
feedback
Top