Thesis (Ph. D.)--Johns Hopkins University, 1919. / Vita. Published also in the Report of the Maryland Geological survey, 1896, v. 12, pt. IV, 1928.

Thesis (Ph. D.)--Johns Hopkins University, 1919. / Vita. Published also in the Report of the Maryland Geological survey, 1896, v. 12, pt. IV, 1928.

Thesis (M.S.)--University of Wisconsin. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 45-47).

Thesis (doctoral)--Rijksuniversitet te Utrecht.

No description available.

The geology of the East Sooke peninsula comprises a core of olivine gabbro, peripherally uralitized and bounded on the north and east by upper Eocene Metchosin basalts of submarine origin. The gabbro intrudes the basalts which are unconformably overlain by sediments of the Sooke Formation of Miocene-Oligocene age. The Sooke gabbro intrusion is an elliptical body of slightly differentiated olivine gabbro which is composed of calcic plagioclase and clino-pyroxene with minor olivine and orthopyroxene. The gabbro does not exhibit any obvious cryptic or cumulate layering of the type which characterises many other layered basic igneous intrusions. Instead steeply dipping structures such as weak layering, foliation and lineation are believed to be flow structures. Intensity of uralitization of the olivine gabbro increases near the margin of the intrusion and towards fractures which appear to have acted as channelways for a convective flow of hydrous fluids within and around the hot intrusion. Concentrations of copper sulphides, deposited from these fluids, are found in structurally favourable areas. The gabbro intrusion is thought to mark the position of a volcanic neck or feeder, now exposed by erosion of a thick sequence of Eocene submarine basalts which built up from ocean floor in a manner similar to the Hawaiian chain of oceanic islands. An hypothesis of oceanic origin for the basalt and gabbro sequence is complemented by reinterpretation of the geophysical data from south Vancouver Island. The Metchosin basalts and gabbro intrusions are thought to represent an oceanic suite of rocks emplaced by ohduction on the southern tip of Vancouver Island. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

<p> A gabbroic intrusion within the Wabigoon Greenstone Belt, southeast of Dryden Ontario, was studied and mapped. Petrographic examination of the sill was carried out and geochemical whole rock data was obtained using X.R.F. methods. </p> The Gabbro Lake Sill was injected into a mafic pile and subsequently underwent fractional crystallization and differentiation. The sill exhibits good phase layering resulting in its division into six basic units: Chilled Margin Gabbro Diabasic Gabbro Leucocratic Gabbro Pyroxenitic Gabbro Pegmatitic Gabbro Sheared Gabbro </p> <p> These units are evident in thin section and are distinguishable both modally and textUrally. In most cases, variations in the chemistry and norms reflect the units mapped in the field. </p> <p> Many features of the sill are analogous to other intrusions, and comparisons have been drawn and theories incorporated to explain these features in the Gabbro Lake Sill. </p> / Thesis / Bachelor of Science (BSc)

<p>Edaphic factors--those pertaining to the substrate or soil--are thought to play an important role in the diversification of flowering plants. Although edaphic factors are widely interpreted as causal agents in plant diversification, little is known about the evolutionary origin of most edaphic endemic plants, preventing inference of potential mechanisms by which substrate properties may influence speciation. The North American plant genus Ceanothus (Rhamnaceae) contains 9 edaphic-endemic species, taxa restricted to soils derived from specific geological materials. The three components of my dissertation research aim to improve understanding of how edaphic ecology has influenced the diversification of Ceanothus. First, I use DNA sequence data from the low-copy nuclear gene nitrate reductase to reconstruct the phylogeny of Ceanothus and elucidate diversification of this group into the California Floristic Province (CFP) of western North America, including the evolution of edaphic endemism. This research indicates that diversification of the two Ceanothus subgenera (Cerastes and Ceanothus) is centered on the CFP and is characterized by shallow divergence and phylogenetic relationships defined predominantly by geography. Divergence time estimation suggests that diversification of both Ceanothus subgenera began approximately 6 Ma. The nine edaphic-endemic taxa are not phylogenetically clustered in my analyses, suggesting that the origin of edaphic endemism has occurred on multiple occasions, including multiple examples of serpentine endemism. The second chapter of my dissertation uses soil chemistry data in combination with a more detailed examination of genetic variation in nitrate reductase to elucidate the evolution of a single edaphic endemic species.</p> / Dissertation

Thesis (M.S.)--University of Hawaii at Manoa, 2004. / Includes bibliographical references (leaves 159-185). Also available via World Wide Web.

Göttingen, Univ., Diss., 2004.