Proposed Title 1: - Queen's University

and broken Kfs 1 and Qtz 1 embedded in a matrix of crushed and dynamically recrystallized
Qtz 1 . G: Sub-vertical northeast trending en-échelon Qtz-filled tension gashes showing dextral
lateral sense of displacement. H: Breccias with Cal 8 -filled matrix embedding angular
fragments of mylonite. I: Northeast-striking pegmatite dikes in the footwall of the shear zone.
J: Northeast-striking mafic dikes with chilled margin cross cutting the shear zone. K:
Northwest-striking breccia dikes comprising fragments of the host rock embedded in a Chlrich
matrix. L: Qtz veins Stockworks showing evidence of hydraulic fracturing. Pen indicates
north. Bt: biotite, Chl: chlorite, Hbl: hornblende, Kfs: Potassium feldspar, Qtz: quartz, Src:
sericite, U: uraninite.
Calcite-filled breccias overprint the mylonite and cataclasite rocks in the footwall of
the shear zone. Breccia fragments comprise angular mylonite and cataclasite clasts derived
from the host rock (Fig. 2.5H). The fragments vary in size from 0.2 mm to more than 2 cm.
The matrix is composed of Cal 8 calcite, Chl 7 chlorite and Hem 6 hematite (Fig. 2.5H).
Late brittle deformation features that overprint the shear zone include veins, dikes, joints,
and fractures. Field measurements indicate three set of steeply dipping joints striking
N320 o , N020 o , and N280 o .
Pegmatite dikes cut across the footwall of the shear zone. They strike northeast and
form a series of sheared elongate lenses of varying size (1 to 2m in length) and are
disrupted along the shear zone (Fig. 2.5I).
Diabase dikes form a swarm crosscutting all previous rocks. They are sub-vertical, weakly
deformed with chilled margins (Fig. 2.5J) and strike along two preferential directions:
parallel to the foliation and along the northwest striking pre-existing joints and fractures.
Breccia-dikes outcrop in the footwall of the shear zone (Fig. 2.5K) in three structural
sets of direction: N020 o , N090 o , and N320 o . The breccia-dikes vary in width from less than
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