The Mount Brenner stock has intruded folded sedimentary
and meta sedimentary rock that lie 40 miles northeast of Dawson City, Yukon Territory. The stock consists of four major concentric zones: (l) an outer zone of fine to medium-grained augite-biotite monzonite; (2) a zone of
very coarse-grained monzonite porphyry; (3) an intermediate
zone of porphyritic horn blende monzonite; and (4) a central
zone of coarse-grained pink quartz monzonite porphyry.
Except for the outer zone, all rock types are porphyritic
and the alignment of feldspar phenocrysts gives the rocks a
primary flow structure which conforms to steeply outward
dipping gradational internal contacts. All external
contacts are sharp. The regional structural trend is
modified in the vicinity of the stock so that beds are
generally conformable with the intrusive contact.
From structural evidence, it is concluded that at
the present level of erosion, the stock was emplaced by
forceful injection. The different rock zones of the
stock can be accounted for by differentiation of an augite-biotite monzonite magma by a combination of crystal fractionation , volatile and alkali diffusion, and multiple intrusion. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/41708 |
| Date | January 1966 |
| Creators | Lambert, Maurice Bernard |
| 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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