GEOL 566 - Extensional Tectonics
Instructor: Gary Axen, MSEC 344, gaxen at ees.nmt.edu, x5178
Readings: To be assigned from the literature restricted access
Course Format: The course will be run seminar style with brief lecture interludes (more common in the beginning) to provide a common background. Students will read and individually present papers most weeks, and the class will discuss them. A multi-day field trip is required—location(s) to be determined by class interests. The field guide will be prepared by the class and students will be responsible for introducing stops and leading discussions at stops. A term paper on a subject of your choice is also required. This should be in the format of a research proposal to extend our knowledge of some aspect of extensional tectonics.
Grading: Weekly presentations 20%; Participation in discussions, 20%; Field Trip 30%; Proposal 30%.
Topics (not an exhaustive list):
Field Trip Possibilities:
Metamorphic core complexes, S AZ &/or SE CA (Oligo-Miocene)
Visits to some of the classic MCCs (early footwall mylonites and overprinting cataclastic (breccias) and untracataclastic (“microbreccia ledge”); mylonite fronts; kinematic and transport direction indicators; 3D strain field, upper-plate structure;
Central Basin & Range – Colorado Plateau transition, SE NV and SW UT (mid-Miocene)
Where low-angle normal faulting was proven in PZ-Mz strata affected first by Sevier thrust belt then by large-magnitude extension
Central Basin & Range to Death Valley (Mid Miocene-Quaternary)
High-magnitude extension between the CO plateau and Sierra Nevada; interplay of extensional and strike-slip structures; evolution of the late Precambrian-Pz miogeosyncline (passive margin), and late Pz, Mz& early Tertiary tectonic setting
Salton Trough, SE CA (late Miocene-Quaternary)
Late Miocene-Quaternary extension in the evolving transtensional plate boundary
Last Updated: September 22, 2010
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