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タイトルヨミ
サンイン ダリンタフ チイキ ニ ミラレル シン ダイサンキ カザンガン ノ ガンセキ カガクテキ チイキセイ
タイトル別表記
Petrochemical Regionality of the Miocene Volcanic Rocks from the San-in Green Tuff Region, the Inner Belt of Southwest Japan
ファイル
言語
日本語
著者
三浦 清
内容記述(抄録等)
Many volcanic rocks in the Miocene age, are known in the green tuff region of Shimane prefecture, the coast of the Sea of Japan.
There are two volcanic rock series : calc-alkaline and tholelitic. The rock series tend to vary with time and stratigraphic level in this region. Both series include basalt, andesite, dacite and rhyolite.
From petrochemical point of view, based on the alkali content, these rocks are classified into the following three types : lower, middle and higher types in K_2O and K_2O+<Na>_2O content.
The first type occur on the Oda Miocene sedmentary basin underlain by Sangun metamorphic rocks. The second one occur on the Izumo and Matsue Miocene sedimentary basin underlain by Paleogene granite batholith. The last one occurs on the Shimane peninsula district. The basement rocks of the Miocene sediments in this district are composed of rocks which belong to the Hida-Oki metamorphic rocks in the western part and Paleogene granite batholith in the eastern part. The regionality on the petrochemical nature of these volcainc rocks may result from the difference of these basement rocks.
It may be given as a conclusion that the K_2O and K_2O+<Na>_2O content of volcanic rocks in this region tend to increase with the advancing development of continental-type crust.
掲載誌名
島根大学教育学部紀要. 自然科学
8
開始ページ
51
終了ページ
58
ISSN
05869943
発行日
1974-12-25
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