Petrology of the Cenozoic volcanic rocks of the basal Clarno Formation, central Oregon

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dc.contributor.advisorRogers, John J. W.en_US
dc.contributor.committeeMemberBaker, Donald R.en_US
dc.contributor.committeeMemberLallemant, Hans G. Avéen_US
dc.creatorWilson, Patricia McDowellen_US
dc.date.accessioned2018-12-18T21:15:15Zen_US
dc.date.available2018-12-18T21:15:15Zen_US
dc.date.issued1973en_US
dc.description.abstractThe Clarno Formation is a volcanic unit of Eoceneearly Oligocène age in central Oregon. It is unconformably underlain by the Cretaceous clastic rocks of the HudspethGable Creek Formations and succeeded by the tuffs of the John Day Formation. The basal 2-3 feet of the Clarno Formation, consisting of flows, lahars, and pyroclastics, was examined near the town of Mitchell. The flow units were sampled for major element analysis. Analyses were performed for twenty-six basal flows by means of x-ray fluorescence and neutron activation. Several chemical parameters were used to delineate the calcalkaline nature of the basal Clarno Formation: AFM diagrams of Clarno data reveal no iron enrichment; K2O contents range from .4% - 3.56%; KgO/NagO ratios are generally lower than .5* Chemical criteria were also used to classify the Clarno Formation as continental, including: the slope of the potash vs. silica variation diagram, the level of KgO at 55% SiOg, the values of T = [(AlgOg - Na2)/Ti2], and the values of the ratio of total iron to magnesium. An attempt is made to relate the geochemistry of the basal Clarno Formation to the general tectonic regime of the developing continental margin of the Cenozoic Northwestern United States.en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent53 ppen_US
dc.identifier.callnoThesis Geol. 1973 Wilsonen_US
dc.identifier.citationWilson, Patricia McDowell. "Petrology of the Cenozoic volcanic rocks of the basal Clarno Formation, central Oregon." (1973) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/103913">https://hdl.handle.net/1911/103913</a>.en_US
dc.identifier.digitalRICE1539en_US
dc.identifier.urihttps://hdl.handle.net/1911/103913en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.titlePetrology of the Cenozoic volcanic rocks of the basal Clarno Formation, central Oregonen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentEarth Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Artsen_US
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