Record Details

Elemental abundances in selected Oregon basalts

ScholarsArchive at Oregon State University

Field Value
Title Elemental abundances in selected Oregon basalts
Names Nicholson, Barry Howard (creator)
Schmitt, Roman A. (advisor)
Date Issued 1970-08-11 (iso8601)
Note Graduation date: 1971
Abstract Ninety basalt samples from eight locations in central Oregon
and one location in the Willamette Valley were analyzed for Si and Al.
Fourteen basaltic rock specimens (> 1 kg each) from four buttes in the
Willamette Valley were sampled and analyzed for Si, Al, Fe, Na, K,
Mn, Cr, Co, Sc, and La. All analyses were carried out via instrumental
neutron activation analysis to precisions of about 15% for K,
20% for La, 40% for Cr, and about 2-4% for the remaining elements.
The average abundances of all locations were compared with the
average abundances of Picture Gorge, Yakima, and Late Yakima
basalts, the three subtypes of Columbia River basalt. The five
Willamette Valley averages were also compared with those of normal
continental tholeiites and the Siletz River tholeiites and alkalic basalts.
The Si abundance averages for Emigrant Creek, Highway 27,
Madras, Bond Butte, and Coburg Quarry locations were found to match within limits those of Picture Gorge basalt. The Al averages
were somewhat lower than in Picture Gorge for the Madras site and
somewhat higher for the remaining four sites.
The average values obtained for the lower six Klickitat River
flows were found to agree with average values for Yakima basalt.
Abundance averages of Locke Lake, Rock Creek Canyon, the
upper nine Klickitat River flows, Hay Creek Canyon, Hale Butte, and
Knox Butte were all found to agree within limits with average values
of Late Yakima basalt. From the field relations, the basalts from
Hay Creek Canyon are believed to be of Yakima type.
The individual abundances obtained from the Locke Lake and
Rock Creek sites suggest that four of the flows from each site may be
laterally equivalent with each other.
The abundance averages for Saddle Butte suggest that the flows
which make it up are probably not related to Columbia River basalt.
No significant relationship between any of the Willamette Valley
sites and the Siletz River tholeiitic or alkalic basalts was established,
except for Hale Butte, whose average abundances appear to fit into the
abundance ranges for the Siletz River alkalics.
Genre Thesis/Dissertation
Topic Geochemistry
Identifier http://hdl.handle.net/1957/45565

© Western Waters Digital Library - GWLA member projects - Designed by the J. Willard Marriott Library - Hosted by Oregon State University Libraries and Press