Earth and Planetary Sciences ETDs

Publication Date

5-29-1963

Abstract

The Olalla stock is located in the Okanagan Mountains of south-central British Columbia, about 20 miles north of the international boundary. It occupies approximately 6 square miles and consists of late Mesozoic mafic and ultramafic rocks and subordinate alkalic rocks, which have intruded previously folded and metamorphosed sediments of the Triassic (?) Shoemaker Foundation.

The rocks of the stock may be broadly grouped into two major categories: (1) those formed from the differentiation of a crystallizing magma that probably entered during the Nevadan orogeny, and (2) those formed by metasomatic replacement of pyroxenite. The rocks of the first category are, in order of age: augite, pyroxenite, monzonite, ayenodiorite, and granite. Syenite is the only rock belonging to the second category.

Degree Name

Earth and Planetary Sciences

Level of Degree

Masters

Department Name

Department of Earth and Planetary Sciences

First Committee Member (Chair)

Wolfgang Eugene Elston

Second Committee Member

Abraham Rosenzweig

Third Committee Member

J. Paul Fitzsimmons

Document Type

Thesis

sturdevant_table2.tif (244 kB)
Table 2. Modal analysis of the igneous rocks

sturdevant_fig3.tif (63112 kB)
Figure 3. General outcrop pattern of igneous rocks, south-central British Columbia

sturdevant_fig4_25.jpg (4194 kB)
Figure 4. Geologic Map and Structure Section of the Olalla Stock, British Columbia - 25% resolution

sturdevant_fig4.tif (239595 kB)
Figure 4. Geologic Map and Structure Section of the Olalla Stock, British Columbia

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