Silicic volcanism in the central Oregon Cascade range has decreased in both the size and frequency of eruptions from its initiation at ~40 Ma to present. The reasons for this reduction in silicic volcanism are poorly constrained. Studies of the petrogenesis of these magmas have the potential for addressing this...
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HighCascade Silicic Volcanism: Analysis of the Lower Bridge and McKenzie Canyon Tuff
by Daniel W
Silicic volcanism in the central Oregon Cascade range has decreased in both the size and frequency of eruptions from its initiation at ~40 Ma to present. The reasons for this reduction in silicic volcanism are poorly constrained. Studies of the petrogenesis of these magmas have the potential for addressing this...
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for the degree of Master of Science in Geology presented on July
31, 2012
Title: Early High
The Glass Buttes volcanic complex is a cluster of bimodal (basalt-rhyolite), Miocene to Pleistocene age lava flows and domes located in Oregon's High Lava Plains province, a broad region of Cenozoic bimodal volcanism in south-central Oregon. The High Lava Plains is deformed by northwest-striking faults of the Brothers Fault Zone,...
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Mapped
Tub
Tr1f
)
4.51±0.17Ma
Grassy
Butte
Hat
Butte
Little Glass
Butte
Round Top
Butte
Cascade
The Glass Buttes volcanic complex is a cluster of bimodal (basalt-rhyolite), Miocene to Pleistocene age lava flows and domes located in Oregon's High Lava Plains province, a broad region of Cenozoic bimodal volcanism in south-central Oregon. The High Lava Plains is deformed by northwest-striking faults of the Brothers Fault Zone,...
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AN ABSTRACT OF THE THESIS OF
Darrick E. Boschmann for the degree of Master of Science in Geology