Quetico Fault in the Superior Province of the southern Canadian Shield / by Myra Carolyn Kennedy. --
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Structural geology thesis on a fault zone in the Canadian Shield.
This is a geological study of the Quetico fault and deformation, not research itself.
Structural geology thesis on the Quetico Fault; earth science domain.
Résumé
The Quetico fault is a major transcurrent fault in the \nsouthern Superior Province of the Canadian Shield. Along part of \nits length the fault forms the boundary between the \nWabigoon subprovinces. Dextral motion on the fault \nby dextral microfaults and appropriately asymmetrical quartz \nc-axis petrofabrics. \nThe fault comprises a zone of dynamically metamorphosed \nrocks - primarily mylonitic rocks with some cataclastic rocks and \npseudotachylite. A transition from predominantly ductile \ndeformation to brittle deformation occurred during the time the \nfault was active. \nThe ductile deformation of quartz within the fault zone \nis the result of crystal-plastic processes, \nprism planes in the a-direction and slip on \na-direction, accompanied by dynamic recovery and syntectonic \nrecrystallization. Feldspar grains are commonly deformed in a \nbrittle manner by fracture processes. Particulate flow appears \nto have made a significant contribution to deformation in the \nfault zone. \nThe harmonic mean of deformed grain axial-ratios and strain determinations by the all object-object separations method \nindicate that flattening strain is predominant within the fault \nzone. The magnetic susceptibility anisotropy ellipsoid is also \nflat-shaped and coaxial with the strain ellipsoids. The \ncharacteristics of microfaults and folds within the fault zone \nindicate that flattening may have been accompanied by or followed \nby shearing. The harmonic mean of deformed quartz grain axial \nratios yields a minimum strain estimate of 130% extension in X, \n58% extension in Y, and 71% shortening in the 1 direction.
Conservé avec la notice de tri, où il sert de preuve aux étiquettes ci-dessus.
La notice
- Revue
- Knowledge Commons (Lakehead University)
- Thématique
- Neuroscience and Music Perception
- Domaine
- Neuroscience
- Établissements canadiens
- —
- Organismes subventionnaires
- —
- Mots-clés
- MyloniteSinistral and dextralFault (geology)FlatteningCataclastic rockDeformation (meteorology)Slip (aerodynamics)ShieldQuartz
- Résumé présent dans OpenAlex
- oui