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Lower Mesozoic facies and crosscutting sequence boundaries: Constraints on displacement of the Caborca terrane

By
John E. Marzolf
John E. Marzolf
Department of Geology, Southern Illinois University, Carbondale, Illinois 62901, USA
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Thomas H. Anderson
Thomas H. Anderson
Department of Geology and Planetary Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
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Published:
January 01, 2005

Five Triassic and Jurassic tectonosequences recognized on the Colorado Plateau have been identified within the Caborca terrane in Sonora, Mexico. Piercing lines defined by truncation of tectonosequence boundaries constrain the pre-offset position of the terrane. Restoration of 1040 ± 290 km of Middle to Late Jurassic left slip along the Mojave-Sonora megashear places the Caborca block in a paleogeographic position that satisfies the constraints provided by truncated tectonosequences and yields predictable regional facies distributions for all tectonosequences. The restoration is consistent with previous estimates of displacements based upon offset of correlative (1) terrains of crystalline basement and (2) pre-Oxfordian cover.

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Contents

GSA Special Papers

The Mojave-Sonora Megashear Hypothesis: Development, Assessment, and Alternatives

Thomas H. Anderson
Thomas H. Anderson
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Jonathan A. Nourse
Jonathan A. Nourse
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James W. McKee
James W. McKee
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Maureen B. Steiner
Maureen B. Steiner
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Geological Society of America
Volume
393
ISBN print:
9780813723938
Publication date:
January 01, 2005

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