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

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

Author(s)
Thomas H. Anderson
Thomas H. Anderson
Department of Geology and Environmental Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
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Alexei N. Didenko
Alexei N. Didenko
Institute of Tectonics and Geophysics, Far Eastern Branch Russian Academy of Sciences, Khabarovsk 680000, Russia, and Geological Institute, Russian Academy of Science, Moscow 119017, Russia
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Cari L. Johnson
Cari L. Johnson
Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA
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Alexander I. Khanchuk
Alexander I. Khanchuk
Far East Geological Institute, Far Eastern Branch Russian Academy of Sciences, 159, Prospekt 100-letiya Vladivostoku, Vladivostok 690022, Russia
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James H. MacDonald, Jr.
James H. MacDonald, Jr.
Department of Marine and Ecological Sciences, Florida Gulf Coast University, Fort Myers, Florida 33965, USA
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Geological Society of America
Volume
513
DOI:
https://doi.org/10.1130/SPE513
Copyright:
© 2015 Geological Society of America
Attribution: You must attribute the work in the manner specified by the author or licensor (but no in any way that suggests that they endorse you or your use of the work). Noncommercial - you may not use this work for commercial purpose. No Derivative works - You may not alter, transform, or build upon this work. Sharing - Individual scientists are hereby granted permission, without fees or further requests to GSA, to use a single figure, a single table, and/or a brief paragraph of text in other subsequent works and to make unlimited photocopies of items in this journal for noncommercial use in classrooms to further education and science.
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
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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