島根大学地球資源環境学研究報告

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島根大学地球資源環境学研究報告 14
1995-12-25 発行

隠岐島後中央部における時張山累層の層序と構造

The Tokibariyama Formation in the central part of the Oki-Dogo Island
安達 勝彦
小室 裕明
村上 久
ファイル
内容記述(抄録等)
The Tokibadyama Formation of Late Oligocene to Early Miocene in the central part of Oki Dogo Island mainly consists of felsic to andesitic volcanic rocks and volcaniclastic rocks.It is divided into three members ; the Nakadani Andesite,Choshigawa Rhyolite and Chikaishigawa Andesite Members,in ascending order.The upper part of Choshigawa Rhyolite Member contains intercalated lacustrine shale beds.The Chikaishigawa Andesite Member mainly consists of two pyroxene andesite and clinopyroxene andesite lavas with autobrecciation,partly of andesitic volcaniclastic rocks and olivine basalt lavas.
Most of faults and fold axes strike NE-SW to ENE-WSW.These structural trends may represent the regional stress field during Oligocene.
NCID
AA11455176