The Cordilleran Miogeosyncline in North America

Geologic Evolution and Tectonic Nature

Nonfiction, Science & Nature, Science, Earth Sciences, Geology
Cover of the book The Cordilleran Miogeosyncline in North America by Henry V. Lyatsky, Vadim B. Lyatsky, Springer Berlin Heidelberg
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Author: Henry V. Lyatsky, Vadim B. Lyatsky ISBN: 9783540486930
Publisher: Springer Berlin Heidelberg Publication: April 10, 2006
Imprint: Springer Language: English
Author: Henry V. Lyatsky, Vadim B. Lyatsky
ISBN: 9783540486930
Publisher: Springer Berlin Heidelberg
Publication: April 10, 2006
Imprint: Springer
Language: English
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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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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