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The stratigraphy, geochemistry, and mineralogy of two ash-flow tuffs in the Deschutes Formation, central Oregon

Creator:

Cannon, Debra May

Abstract:

Two ash-flow tuff units of the late Miocene-early Pliocene Deschute Formation in central Oregon were studied in detail because of the widespread distribution, diverse compositions, and stratigraphic importance. The Lower Bridge tuff is a double-flow simple cooling unit that is poorly welded. The upper flow grades from rhyolite in the...

Resource Type:

Masters Thesis
The Deschutes Formation-- High Cascade transition in the Whitewater River area, Jefferson County, Oregon

Creator:

Yogodzinski, Gene M.

Abstract:

The Whitewater River area is located directly east of Mt. Jefferson in the Cascades of central Oregon. Approximately 90 mi2 (230 km2) were mapped (scale 1/24,000) and four new K-Ar ages and 151 major element analyses were obtained in a study of the stratigraphic and magmatic transition from the Miocene...

Resource Type:

Masters Thesis
Geology of the southernmost Deschutes basin, Tumalo quadrangle, Deschutes County, Oregon

Creator:

McDannel, Angela K.

Abstract:

The Tumalo quadrangle lies approximately 30 kilometers behind the Cascade volcanic arc and marks the southernmost extent of continuously exposed Deschutes Formation rocks. Deschutes Formation rocks in the Tumalo quadrangle include late Miocene volcaniclastic sedimentary rocks, ignimbrites and lapillistones, and late Miocene to early Pliocene basalts and basaltic andesites. Volcaniclastic...

Resource Type:

Masters Thesis