Jurassic (170–150 Ma) basins: The tracks of a continental-scale fault, the Mexico-Alaska megashear, from the Gulf of Mexico to Alaska

Thomas H. Anderson

doi:10.1130/2015.2513(03)

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GSA Special Papers

Late Jurassic Margin of Laurasia–A Record of Faulting Accommodating Plate Rotation

Author(s)

Geological Society of America

Volume

513

DOI:

https://doi.org/10.1130/SPE513

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ISBN print:

9780813725130

Publication date:

December 01, 2015

Book Chapter

Jurassic (170–150 Ma) basins: The tracks of a continental-scale fault, the Mexico-Alaska megashear, from the Gulf of Mexico to Alaska

Author(s)

Thomas H. Anderson

Department of Geology and Environmental Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA

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Doi:

https://doi.org/10.1130/2015.2513(03)

Published:

December 01, 2015

The Mojave-Sonora megashear, which bounded the Jurassic southwestern margin of the North America plate from 170 to 148 Ma, may be linked northward to Alaska via the previously recognized discontinuity between the Insular and Intermontane terranes and co-genetic regional elements such as transtensional basins, transpressional uplifts, and overlapping correlative magmatic belts. The longer, continental-scale fault thus defined, which is called the Mexico-Alaska megashear, separated the North America plate from a proto-Pacific plate (the Klamath plate) and linked the axis of ocean-floor spreading within the developing Gulf of Mexico with a restraining bend above which mafic rocks were obducted eastward onto...

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Late Jurassic Margin of Laurasia–A Record of Faulting Accommodating Plate Rotation

Jurassic (170–150 Ma) basins: The tracks of a continental-scale fault, the Mexico-Alaska megashear, from the Gulf of Mexico to Alaska

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