15 Structural Geology, Geophysics, Tectonics, and Volcanology (Posters)

Tuesday, 22 March 2016
8:00 AM - 5:30 PM
Riverview B

LOCALIZED STRAIN ORIENTATIONS EXPOSED IN FOOTWALL SYNCLINE OF BIG BEND NATIONAL PARK

Paper number: 15-6
Program: Technical Sessions
Time: 8:00 AM – 5:30 PM

Authors

Abstract

Dog Canyon of Big Bend National Park in Brewster County, Texas exposes a cross section of the footwall syncline of a Laramide backthrust fault. The hinge zone of the syncline is almost entirely exposed and therefore provides a record of zone-specific strain that is atypically complete. Micro- and meso-scale structures at ground level reveal localized strain orientations but the structures exposed higher than ground level allow a complete interpretation of the range of strain ellipses in the rest of this hinge zone. These are for the first time accessed and mapped via top-roping and rappelling, and presented for both sides of the same drainage exposure.

Geological Society of America Abstracts with Programs. Vol. 48, No. 1

doi: 10.1130/abs/2016SC-273580

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