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Significance of lineation and minor folds near major thrust faults in the southern Appalachians and the British and Norwegian Caledonides1

Published online by Cambridge University Press:  01 May 2009

Bruce Bryant  and
John C. Reed Jr.
Bruce Bryant
Affiliation:
U.S. Geological Survey, Denver Federal Center, Denver, Colorado, U.S.A.
John C. Reed Jr.
Affiliation:
U.S. Geological Survey, Denver Federal Center, Denver, Colorado, U.S.A.
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Summary

The Blue Ridge thrust sheet is one of the principal thrust masses of metamorphic rocks in the southern Appalachians. A broad zone of sheared and retrogressively metamorphosed rocks near the sole of the thrust sheet around the Grandfather Mountain window displays numerous small tight or isoclinal folds having axes subparallel to an intense penetrative cataclastic a lineation and axial planes parallel to foliation in the thrust sheet. These folds seem to have formed by tightening, flattening, and passive rotation of earlier more open folds originally formed perpendicular to the direction of transport. The style and orientation of these folds closely resemble those of analogous structures in thrust masses of crystalline rocks in the Caledonian orogenic belt in Scotland and Norway, suggesting that the structures of both regions may have similar origins.

Type
Articles
Information
Geological Magazine , Volume 106 , Issue 5 , October 1969 , pp. 412 - 429
Copyright
Copyright © Cambridge University Press 1969

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Footnotes

1

Publication authorized by the Director, U.S. Geological Survey.

References

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