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TitleField observations on D1 and D2 deformation fabrics and metamorphic mineral growth in the Newton Fiord region of Hall Peninsula, Baffin Island, Nunavut
 
AuthorBraden, Z M; Young, M D; St-Onge, M R; Skipton, D R
SourceCanada-Nunavut Geoscience Office, Summary of Activities 2012, 2013 p. 65-74 Open Access logo Open Access
LinksOnline - En ligne
Image
Year2013
Alt SeriesEarth Sciences Sector, Contribution Series 20120344
PublisherCanada-Nunavut Geoscience Office
Documentserial
Lang.English
Mediapaper
File formatpdf
ProvinceNunavut
NTS25I/13; 25O/01; 25P/04
AreaBaffin Island; Newton Fiord; Hall Peninsula; Barrow Peninsula
Lat/Long WENS -66.5000 -65.8333 63.0833 62.9167
Subjectsigneous and metamorphic petrology; tectonics; structural geology; tectonic setting; tectonic environments; metamorphism; deformation; Archean; igneous rocks; Lake Harbour Group; Cumberland Batholith; Precambrian; Proterozoic
Illustrationslocation maps; photographs
ProgramCanada-Nunavut Geoscience Office, Funding Program
AbstractThis study is part of the Canada-Nunavut Geoscience Office's Hall Peninsula Integrated Geoscience Program, a multiyear bedrock and surficial geology mapping program with associated thematic studies. To determine the tectonic evolution of polydeformed terrains, the deformation phases and metamorphic events must first be unravelled and defined. Two small map areas on southern Hall Peninsula with contrasting structural styles were mapped and sampled in detail in order to characterize the mineral-fabric relationships and decipher the kinematic and thermal conditions of two deformation phases. The D1 deformation is characterized by a regionally penetrative, bedding-parallel flattening-fabric defined by sillimanite+garnet+ K-feldspar+orthopyroxene, with an associated garnet+cordierite+K-feldspar+melt leucosome formation. The D2 deformation is characterized by a variable strain gradient reflected in almost complete transposition of D1 fabric elements on regional F2 fold limbs, in contrast to a spaced S2 crenulation cleavage in regional F2 fold hinges. The thermal conditions of D2 appear to be lower where the new fabric is defined by sillimanite+garnet+biotite±K-feldspar. The regional F2 fold hinges are windows into the earlier deformation phase, in which S1 is consistently oriented east-northeast, possibly reflecting the original orientation and therefore providing insight into the transport direction of the main penetrative deformation phase.
GEOSCAN ID292135

 
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