Interior Western United States

The GSA Annual Meeting in Salt Lake City provided a large and diverse terrain for field trips—from the Basin and Range to the Rocky Mountains, from the Snake River Plain, across the Colorado Plateau, to the Mojave Desert. This volume contains 22 field trip articles, nearly all of those run at the 2005 meeting. All combine the latest research with useful road logs to spectacular and often classic geologic settings. The regional tour has a core of structure and stratigraphy-paleontology contributions, and is rounded off with volcanic, glacial, lacustrine, fluvial geomorphology, neotectonic, geologic hazard, and geoarchaeology articles.
Folds, fabrics, and kinematic criteria in rheomorphic ignimbrites of the Snake River Plain, Idaho:: Insights into emplacement and flow
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Published:January 01, 2005
Abstract
Recent structural analysis of the Grey’s Landing ignimbrite offers new insights into the emplacement of rheomorphic ignimbrites. We present several key localities, where volcanological and structural features reveal the emplacement history of a lavalike ignimbrite and the evolution of ductile deformation structures during and after deposition across complex topography. Excellent three-dimensional exposure allows us to interpret structural features of the Grey’s Landing ignimbrite in the context of diverse emplacement models for rheomorphic ignimbrites elsewhere and to consider field criteria to distinguish between lava-like ignimbrites and extensive silicic lavas.
- Basin and Range Province
- deformation
- ductile deformation
- emplacement
- fabric
- faults
- field trips
- folds
- Idaho
- igneous rocks
- ignimbrite
- kinematics
- North America
- pyroclastics
- rheomorphism
- rhyolites
- road log
- shear zones
- Snake River plain
- tuff
- Twin Falls County Idaho
- United States
- volcanic rocks
- Grey's Landing Ignimbrite