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Microfabrics of a recumbent fold in cross-bedded sandstones

Published online by Cambridge University Press:  01 May 2009

K. Yagishita  and
R. C. Morris
K. Yagishita
Affiliation:
Geology Department, Northern Illinois University, DeKalb, Illinois 60115, U.S.A.
R. C. Morris
Affiliation:
Geology Department, Northern Illinois University, DeKalb, Illinois 60115, U.S.A.
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Summary

A thin-section study of the orientation of long-axes of quartz grains was conducted for a similar type fold of overturned cross-bedding in Carboniferous sandstones. Preferred orientation of detrital grains of the fold shows that (a) apparent long-axes of grains are parallel to the axial plane in a plane normal to the fold axis, (b) long-axes of grains in the axial plane are oriented in a high angle to the fold axis, and (c) grains are aligned parallel to the fold axis in a plane perpendicular to the other two directions. From the dimensional orientation of quartz grains in this sample, it is concluded that the overturned fold was made by a shear mechanism immediately following sedimentation in which the original quartz grains were reorientated by small-scale slippage along the shear planes.

Type
Articles
Information
Geological Magazine , Volume 116 , Issue 2 , March 1979 , pp. 105 - 116
Copyright
Copyright © Cambridge University Press 1979

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