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Basement thrust sheets in the Clearwater orogenic zone, central Idaho and western Montana ( USA).

Geology

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Abstract

The Clearwater orogenic zone in central Idaho and W Montana contains at least 2 major NE-directed Cordilleran thrust plates of Early Proterozoic metasedimentary and metaigneous rocks that overrode previously folded Middle Proterozoic rocks of the Belt basin in Cretaceous time. The northeastward migration of the resultant thickened wedge of crustal material combined with Cretaceous subduction along the W continental margin produced a younger N Bitterroot lobe of the Idaho batholith relative to an older S Atlanta lobe. Eocene extensional unroofing and erosion of the Bitterroot lobe has exposed the roots of the thick Cordilleran thrust sheets.-Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Basement thrust sheets in the Clearwater orogenic zone, central Idaho and western Montana ( USA).
Series title:
Geology
Volume
15
Issue:
3
Year Published:
1987
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geology
First page:
220
Last page:
224
Number of Pages:
5