Date of Graduation

Spring 2011

Degree

Master of Science in Geospatial Sciences

Department

Geography, Geology and Planning

Committee Chair

Kevin Mickus

Keywords

Izee Terrane, Izee Basin, Bouger gravity, magnetics, Blue Mountain Province, Mesozoic accretionary tectonics

Subject Categories

Cosmology, Relativity, and Gravity | Geology

Abstract

An analysis of gravity and magnetic data was used to compliment the geological studies of the Mesozoic and Paleozoic accretionary terranes within the Blue Mountain Province (BMP) of Northeastern Oregon. The production of a complete Bouguer gravity anomaly map, regional and residual (band-pass filtered) gravity and magnetic maps, as well as the generation of isostatic residual gravity anomaly and horizontal derivative gravity anomaly maps aided in the interpretation of areas of interest within the Izee terrane of the BMP. Two-2D gravity and magnetic models of selected transects across the southwestern extent of this terrane were produced using constraints from existing geologic and geophysical studies. Coupled with the newly developed maps, the models provide otherwise unavailable constraints on the extent and geometries of Triassic and Jurassic formations within the Izee sedimentary basin including the presence of an anomously high density body at a depth of 4-7 km, a high amplitude magnetic anomaly related to the Baker terrane and an acute gravity minimum of the adjacent Strawberry Mountain volcanics. Additional analysis of these features may substantiate the findings and help re-define the subsurface extent of these Mesozoic terranes.

Copyright

© Barbara J. Garcia

Campus Only

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