| Abstract: | Normal faults on the outer slopes of trenches and collisional foredeeps reveal that high-amplitude lithospheric flexure can result in inelastic extensional deformation of the convex side of a flexed plate. This process, which we call "flexural extension‘, differs fundamentally from rifting in that the lower lithosphere contracts while the upper lithosphere extends. Structural evidence does not support common illustrations of flexural normal faults as planar-irrotational structures which simply die out at shallow crustal depths. Instead, the surface geology shows that flexural normal faulting must be rotational with respect to the enveloping surface of the flexed plate. This toppled domino geometry implies the presence at depth of a detachment or zone of distributed ductile simple shear where fault displacement and block rotation are accommodated. -from Authors |
| Genre: | Article |
| ProdID: | 70015046 |
| Citation Author: | Bradley, D. C.; Kidd, W. S. F. |
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| Citation End Page: | 1438 |
| Citation Issue: | 11 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geological Society of America Bulletin |
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| Citation Number Of Pages: | 23 |
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| Citation Search Results Text: | Flexural extension of the upper continental crust in collisional foredeeps; 1991; Article; Journal; Geological Society of America Bulletin; Bradley, D. C.; Kidd, W. S. F. |
| Citation Start Page: | 1416 |
| Citation Volume: | 103 |
| Citation Year: | 1991 |
| Type: | citation/reference |
| Text: | Flexural extension of the upper continental crust in collisional foredeeps; 1991; Article; Journal; Geological Society of America Bulletin; Bradley, D. C.; Kidd, W. S. F. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 1991 00:00 -0600 |
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