Thesis (B.Sc.(Hons))--University of Adelaide, 1970.

Thesis (Ph.D.)--The Johns Hopkins University, 2006. / (UnM)AAI3213842. Adviser: George W. Fisher. Source: Dissertation Abstracts International, Volume: 67-04, Section: B, page: 1882.

Plagioclase phyric lavas of the Roza Member cover approximately 40,000 km$\sp2$ in Oregon and Washington. Field relationships in 85 stratigraphic sections and geochemical analysis of 765 samples indicate that the Roza Member consists of 1 to 4 flow units. Systematic variations in Cr, Nb, Zr, P$\sb2$O$\sb5$, and TiO$\sb2$ allow these flow units to be divided into 6 chemically distinct subtypes. Incompatible element abundances decrease while the Cr concentration and plagioclase phenocryst population increase upward through the Roza succession. Most other elements display only minor variations. Stratigraphic relations between the 6 Roza subtypes are complex. The areal distribution of each subtype reflects the interaction of the constructional topography of older Columbia River basalts, regional structure, geomorphology, and location and timing of activity along the 175-km long linear Roza vent system. The distribution of the chemically defined subtypes within the dikes and vents indicate that only short segments of the vent system were active at any given time. Calculations (assuming a conductive cooling regime--an assumption supported by primary intraflow features and cooling-joint measurements), indicate that decades elapsed between successive Roza eruptions. These temporal constraints are supported by a lack of saprolite horizons between Roza cooling units and an absence of large-scale geochemical variation due to magma reservoir processes, and are consistent with estimates of Columbia River basalt recharge rates. The earliest Wanapum eruptions (the Robinette Mountain and Dodge Basalts, Eckler Mountain Member) were distinctly more mafic than the subsequent "main" Wanapum Frenchman Springs-Roza-Priest Rapids sequence (e.g., Rob. Mtn.: Mg' $\approx$ 61, Nb $\approx$ 4ppm, Cr $\approx$ 137ppm; versus Roza: Mg' $\approx$ 39, Nb $\approx$ 15ppm, Cr $\approx$ 33ppm). The main Wanapum succession is enriched in both the large ion lithophile elements (K, Rb, Ba, Th) and radiogenic isotopes relative to the Eckler Mountain lavas. However, similar incompatible element rations for the Wanapum basalts imply lava derivation from comparable mantle sources. Major and trace element modelling suggest that coupling fractional crystallization of OL + PL + CPX + TiMT ($\approx$5:60:34:1) with periodic eruption of $\approx$10 volume percent of a steady state reservoir, minor ($\approx$3%) assimilation of crust similar to the Wallowa Batholith, and recharge by a Robinette Mountain-like parental magma can generate lavas compositionally similar to the Frenchman Springs-Roza-Priest Rapids sequence.

Nain craton tonalites show overall similarities to Uivak gneisses of northern Labrador, but are K$\sb2$O-poor and have variable LIL element contents--ascribed to variable degrees of Late Archean migmatization. Orthogneisses from the southern part of the Nain Province and from the Rae Province in the area studied show the greatest signs of LIL element depletion. Few mafic igneous rocks of Archean or Early Proterozoic age in this area appear to represent primary liquids. Many of these rocks are compositionally alkali basalts, high-Mg tholeiites, basaltic komatiites, or contain appreciable cumulus olivine. Most have nearly chondritic elemental ratios, although a few are more akin to those in modern-day MORB. Fine-grained metasedimentary rocks have geochemical signatures appropriate for their being derived from the quartzofeldspathic orthogneisses. Nd, Sr and Pb isotopic data were obtained on samples of troctolites, norites, anorthosites and plagioclase megacrysts from across the entire central portion of the exposed NPS. Primitive initial Nd and Sr isotopic ratios are preserved in olivine-bearing plutons and in a plagioclase megacryst from the western side of the massif. Significant variation in initial $\varepsilon\sb{\rm Nd}$ occurs across the NPS, from about $-$4 to $-$7 for magmas emplaced into the Rae Province (west), decreasing to $-$8 to $-$15 for magmas intrusive into Nain craton (east) and underscores the role of pre-existing lithosphere in controlling massif anorthosite isotopic compositional variation. This is strongly supported by preliminary Pb isotopic data. Mixing models between an estimated parent magma derived from a depleted source and specific samples of crust from country rock contacts reproduce the observed data, but require 30-60% contamination. A uniform level of most primitive (least contaminated) isotopic anorthosites from the western section and troctolites implies a 'ceiling' of $\varepsilon\sb{\rm Nd} \sim-$3, $\varepsilon\sb{\rm Sr} \sim$ +5 at 1.3 Ga. A model is proposed involving enrichment of a previously depleted lithospheric source at a minimum of 2.0 Ga, which is then inherited by the parental magmas to the anorthosite suite at 1.3 Ga. Magmas then assimilate either Archean or Proterozoic lower crust (depending on location). Calculated assimilation proportions are thereby reduced by approximately 15%. (Abstract shortened by UMI.)

Thesis (Ph. D.)--University of Wisconsin - Madison, 2005. / (UnM)AAI3186163. Source: Dissertation Abstracts International, Volume: 66-08, Section: B, page: 4128. Supervisor: John W. Valley.

Thesis (Ph.D.)--Yale University, 2006. / (UMI)AAI3243705. Adviser: Mark Thomas Brandon. Source: Dissertation Abstracts International, Volume: 67-12, Section: B, page: 6968.

Thesis (M.Sc.) -- Memorial University of Newfoundland. / Typescript. Bibliography: leaves 70-84. Also available online.

Thesis (M.S.)--Oregon State University, 1994. / Two folded plates in pocket. Typescript (photocopy). Includes bibliographical references (leaves 117-124). Also available on the World Wide Web.

Thesis (M.S.)--Oregon State University, 1994. / Includes mounted photographs. One folded plate in pocket. Typescript (photocopy). Includes bibliographical references (leaves 181-185). Also available on the World Wide Web.

Thesis (Ph. D.)--Washington State University, May 2006. / Includes bibliographical references (p. 139-155).