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Early Mesozoic tectonic evolution of the western U.S. Cordillera

Saleeby, Jason B. and Busby-Spera, Cathy and Oldow, J. S. and Dunne, G. C. and Wright, J. E. and Cowan, D. S. and Walker, N. W. and Allmendinger, R. W. (1992) Early Mesozoic tectonic evolution of the western U.S. Cordillera. In: The Cordilleran Orogen: Conterminous U.S. The Geology of North America. No.G-3. Geological Society of America , Boulder, CO, pp. 107-168. ISBN 9780813752174.

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The early Mesozoic evolution of the U. S. Cordillera differs greatly from its previous history of mainly miogeoclinal sedimentation with outboard marginal-basin-island-arc mobile zones. The Early Mississippian and Permian-Triassic thrust emplacement of eugeoclinal strata across the miogeocline signaled the initial propagation of subduction-related tectonism onto the sialic edge. Following these events, the sialic edge and the resulting accreted terranes became an active continental margin. The active margin history records not only eastward subduction of oceanic crust beneath North America, but also the formation, migration, and accretion of marginal basin and fringing island-arc systems along the continental margin. At the close of the Jurassic, the fringing arc-marginal basin system collapsed, resulting in a more direct interaction of major Pacific basin plates with hte Cordilleran margin. Such interactions are manifested by Andean and San Andreas types of marginal regimes which characterized the Cretaceous and Cenozoic. In this chapter we will discuss the tectonic evolution of the U. S. Cordilleran margin during the early phases of its active margin history (Triassic through Jurassic).

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Additional Information:© 1992 Geological Society of America.
Series Name:The Geology of North America
Issue or Number:G-3
Record Number:CaltechAUTHORS:20180717-140155640
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87931
Deposited By: Tony Diaz
Deposited On:17 Jul 2018 21:32
Last Modified:16 Nov 2021 00:22

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