The Cordilleran Miogeosyncline in North America : Geologic Evolution and Tectonic Nature EPUB
by Henry V. Lyatsky, Vadim B. Lyatsky
Part of the Lecture Notes in Earth Sciences series
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Steep crustal-scale faults, having their origins in the Late Archean and Early Proterozoic and trending NE-SW, which define the fundamental block lithospheric structure of the North American craton, are seen from geological and geophysical evidence to continue far into the interior of the Late Proterozoic-Phanerozoic Canadian Cordilleran mobile megabelt.
This suggests that variously reworked ex-cratonic basement blocks underlie much of the Cordillera.
The western edge of the modern craton is probably near the Rocky Mountain-Omineca belt boundary; the Rocky Mountain fold-and-thrust belt on the east side of the Cordillera is evidently rootless and overlies the undisturbed cratonic basement.
Phanerozoic differences between the Cordilleran tectonic belts, resulting from a long, dissimilar, multi-cycle history of waxing and waning orogenesis apparent from the rock record, lie chiefly in the degree of indigenous tectonic remobilization and reworking of the ancient crust.
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- Format:EPUB
- Publisher:Springer Berlin Heidelberg
- Publication Date:23/11/2005
- Category:
- ISBN:9783540486930
Information
-
Download Now
- Format:EPUB
- Publisher:Springer Berlin Heidelberg
- Publication Date:23/11/2005
- Category:
- ISBN:9783540486930