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Mineralogy, Chemistry, and Diagenesis of Tuffs in the Sucker Creek Formation (Miocene), Eastern Oregon
Clinoptilolite Diagenesis Opal-CT Smectite Tuff Zeolites
2012/1/5
The lacustrine Sucker Creek Formation (Miocene) of eastern Oregon includes unaltered vitric tufts as well as tufts altered to the following diagenetic facies: (1) bentonite, (2) interbedded bentonite ...
Zeolites in Eocene Basaltic Pillow Lavas of the Siletz River Volcanics, Central Coast Range, Oregon
Analcime Apophyllite Isotope abundance Laumontite Mesolite Pillow lava Smectite Zeolites
2012/1/13
Zeolites and associated minerals occur in a tholeiitic basaltic pillow lava sequence that makes up part of the Eocene Siletz River Volcanics in the central Coast Range, Oregon. Regional zoning of zeol...
Alteration of Andesite in Wet, Unstable Soils of Oregon's Western Cascades
Andesite Halloysite Scanning electron microscopy Smectite Soil Weathering
2012/2/7
Alteration products of andesite cobbles from wet soils formed in volcanic colluvial material were studied using petrographic, electron microscope, X-ray powder diffraction, and thermal techniques. Aug...
Trace Element Concentration in Amorphous Clays of Volcanic Ash Soils in Oregon
Trace Element Concentration Amorphous Clays Volcanic Ash Soils
2012/2/20
Clay fractions in soils from a transect of the Mazama ash deposit (6600-yr-old) contained more than 80% amorphous material. Instrumental neutron activation analysis was used to compare the trace eleme...