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Title :変形前のマーカー楕円の性質 ―沖縄島国頭層群嘉陽層の場合―
Title alternative :Properties on the initial marker ellipses ―in the case of the Kayo Formation, Kunchan Group, Okinawa-jima―
Authors :林, 大五郎
Authors alternative :Hayashi, Daigoro
Issue Date :15-Sep-1992
Abstract :The method that estimates the initial marker ellipse and the averaged initial ellipse is described. Finite strain analysis carried out previously on the Kayo Formation, Kunchan Group, Okinawa-jima (Hayashi, 1988, 1989) is again examined. It is considered that most of the quartz grain markers do not have initial fabrics from the observation of the distribution tendency of long axes of initial marker ellipses. This is also confirmed by the examination with Lisle's symmetric index test and θcurve test (Lisle, 1977, 1985). The strain analysis was performed precisely because the axial ratios of the average initial ellipse are close to 1.O.
初期マーカー楕円と平均初期楕円を計算する方法を解説し,沖縄島国頭層群嘉陽層の歪解析(林,1988,1989)を吟味した.初期マーカー楕円の長軸方位の分布から,解析に使用した石英粒子マーカーには初期ファブリックがなかったと考えられる.このことは,Lisle(1977,1985)の対称性指数とθ曲線テストによる検討から確認された.平均初期楕円の軸比が1に近いため歪解析の精度は高いと思われる.
Type Local :雑誌掲載論文
ISSN :0016-7630
Publisher :日本地質学会
URI :http://hdl.handle.net/20.500.12000/2992
Citation :地質学雑誌 Vol.98 no.9 p.841 -854
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Science)

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