A brief description of the geology of the Shingle
Creek area southwest of Penticton B.C. together with a
more detailed report on the mineralogy and petrology of the
Shingle Creek Intrusion (granite porphyry) are given. The
presence of flows and tuffs showing similar mineralogical
features to the Shingle Creek: Intrusion suggest that this
intrusion was shallow rather than deep-seated. Sanidine phenocrysts showing oscillatory zoning are described with a range in composition of from 40 to 70 percent orthoclase (based on a comparison of optical properties
with those determined by Tuttle 1952). The zones often
occur in pairs showing a gradation from an albite-rich inner
zone to an orthoclase-rich outer gone, It is tentatively
suggested here that pressure changes in the magma, by altering
the liquidus - solidus relations, sight provide this
reversed- zoning.
Plagioclase phenocrysts from the intrusion show
transitional to high temperature optics when compared with
the results of Bowen and Tuttle 1950.
Beta quartz phenocrysts showing rounded outlines and
development of late halos are described, from evidence given
it is suggested that these features are due to resorption of quartz in a magma chamber prior to intrusion, followed by
late growth after intrusion and daring crystallization of
the porphyry matrix,
Petrographlc study of the largest dyke associated
with the porphyritic intrusion has suggested that this dyke
may have been intruded in several stages. / Arts, Faculty of / Geography, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/41666 |
| Date | January 1956 |
| Creators | Bostock, Hewitt Hamilton |
| Publisher | University of British Columbia |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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