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UBC Theses and Dissertations
Geology of the Mount Brenner stock near Dawson City, Yukon Territory Lambert, Maurice Bernard
Abstract
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.
Item Metadata
Title |
Geology of the Mount Brenner stock near Dawson City, Yukon Territory
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1966
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Description |
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.
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Genre | |
Type | |
Language |
eng
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Date Available |
2012-03-22
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Provider |
Vancouver : University of British Columbia Library
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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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DOI |
10.14288/1.0053527
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
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.