Eruptive history of Middle Sister, Oregon Cascades, USA-Product of a late Pleistocene eruptive episode

Eruptive history of Middle Sister, Oregon Cascades, USA-Product of a late Pleistocene eruptive episode

New mapping, geochemistry, and argon geochronology illuminate a brief, remarkably silicic episode set in a mafic segment of the Cascade arc. Middle Sister was constructed during a 35-k.y. episode in the late Pleistocene from mafic, intermediate, and silicic eruptions adjacent to the primarily rhyoli...

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Bibliographic Details
Published in:Geosphere (Boulder, Colo.) Colo.), 2018-10, Vol.14 (5), p.2118-2139
Main Authors: Calvert, Andrew T, Fierstein, Judy, Hildreth, Wes
Format: Magazinearticle
Language:eng
Subjects:
andesites
argon
basalts
Cascade Range
Cenozoic
Cordon Caulle
Crater Lake
eruptions
flows
geochemistry
geochronology
igneous and metamorphic rocks
igneous rocks
Klamath County Oregon
lava flows
mafic composition
Middle Sister
Mount Mazama
noble gases
Oregon
Petrology
Pleistocene
Puyehue
Quaternary
Quaternary geology
rhyolites
stratovolcanoes
United States
upper Pleistocene
volcanic rocks
volcanoes
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Summary:New mapping, geochemistry, and argon geochronology illuminate a brief, remarkably silicic episode set in a mafic segment of the Cascade arc. Middle Sister was constructed during a 35-k.y. episode in the late Pleistocene from mafic, intermediate, and silicic eruptions adjacent to the primarily rhyolitic South Sister. Eruptions in the Three Sisters volcanic cluster prior to 50 ka were exclusively mafic (
ISSN:1553-040X
1553-040X