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タイトルヨミ
トットリ オキ カイテイソウ タイセキブツ ニ ミラレル サンベ カザン キゲン ノ テフラ ト ソノ チシツガクテキ イギ
日本語以外のタイトル
Volcanic ashes derived from Sanbe volcano in the subsurface deposits of Japan sea, off the coast of Tottori and their geological significance
ファイル
言語
日本語
著者
三浦 清
内容記述(抄録等)
Volcanic ashes in the subsurface deposits of Japan sea, off the coast of Tottori, are composed of Utsuryo-Oki ash (U-Oki), Aira Tn ash (AT), Akahoya ash (Ah) and two kind of ashes originated from the eruption of Sanbe volcano. One is Sanbe-Unnan fall pumice (SUn) and its absolute ages of eruption show 40,000 to 50,000Y.B.P.. This tephra is probably the earliest deposit in the second period of volcanic activity of Sanbe volcano. The pumice of SUn is one of hornblende biotite rhyolite, and it shows that K_2O is generally more than <Na>_2O in glass. Other is Sanbe-Ikeda fall pumice (SIP). This tephra is another fall pumice of the later stage of the second eruption period of Sanbe volcano. This is abundant of heavy minerals than SUn. The deposit of SIP was observed to be covered with Aira Tn ash (AT) dated 22,000 Y,B.P..
The present finding bear new meaning that both SUn and SIP are distributed as far as 180km NE direct in from Sanbe volcano. On the basis of this evidence, we have suggested the posibility that these important tephras as key bed are distributed in and around Hyogo prefecture.
掲載誌名
島根大学教育学部紀要. 自然科学
22
1
開始ページ
5
終了ページ
12
ISSN
05869943
発行日
1988-10-31
NCID
AN00107941
出版者
島根大学教育学部
出版者別表記
The Faculty of Education Shimane University
資料タイプ
紀要論文
部局
教育学部
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