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TitlePreliminary observations on Archean and Paleoproterozoic metamorphism and deformation of the southern Hall Peninsula, Baffin Island, Nunavut
 
AuthorSkipton, D R; Schneider, D A; St-Onge, M R
SourceCanada-Nunavut Geoscience Office, Summary of Activities 2012, 2013 p. 29-42 Open Access logo Open Access
LinksOnline - En ligne
Image
Year2013
Alt SeriesEarth Sciences Sector, Contribution Series 20120341
PublisherCanada-Nunavut Geoscience Office
Documentserial
Lang.English
Mediapaper
File formatpdf
ProvinceNunavut
NTS25I/07; 25I/08; 25I/09; 25I/10; 25I/11; 25I/13; 25I/14; 25I/15; 25J/15; 25J/16; 25O/01; 25O/02; 25O/06; 25O/07; 25O/08; 25O/09; 25O/10; 25O/11; 25O/15; 25O/16; 25P
AreaBaffin Island; Hall Peninsula; Beekman Peninsula
Lat/Long WENS -67.5000 -64.0000 64.0000 62.2500
Subjectsigneous and metamorphic petrology; tectonics; structural geology; tectonic interpretations; tectonic setting; tectonic environments; metamorphism; deformation; magmatism; Archean; metamorphic rocks; metasedimentary rocks; orogenesis; 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. The Hall Peninsula on southeastern Baffin Island, Nunavut, is part of the Paleoproterozoic accretion/collision zone of Trans-Hudson Orogen. Reconnaissance scale mapping and preliminary U-Pb geochronological work on the western Hall Peninsula has shown that it consists of Paleoproterozoic granitic plutons that intrude Paleoproterozoic metasedimentary rocks, and that the eastern Hall Peninsula is dominated by an Archean orthogneiss complex. The plutonic rocks have been considered correlative with the Cumberland Batholith, which composes much of southern Baffin Island. The metasedimentary units have been correlated with the Lake Harbour Group of the Meta Incognita microcontinent on southern Baffin Island and with the Tasiuyak gneiss in the Torngat Orogen of northern Labrador. The tectonic affinity of the Archean orthogneiss complex remains enigmatic but it has been linked with similar reworked Archean gneisses in the Nagssugtoqidian Orogen of West Greenland. Bedrock mapping (1:250 000) on southern Hall Peninsula, by the Canada-Nunavut Geoscience Office, in the summer of 2012 has revealed new insights into metamorphism and deformation, with implications for the tectonic history of the Hall Peninsula. Three regional deformational events are recognized: 1) an early east-directed thin-skinned thrusting event (D1); 2) a subsequent east-directed thick-skinned thrusting event (D2); and 3) a late, north-northwest - or south-southeast directed compressional event (D3) characterized by large (2 - 7 km wavelength) folds that plunge shallowly to the west-southwest. The D1 andD2 deformational events are together responsible for the overall northwest-southeast trends in the map pattern of Hall Peninsula, both are characterized by west- to southwest-dipping penetrative foliation and northwest- or southeast plunging fold axes and mineral lineations and both are accompanied by amphibolite-facies metamorphism. Evidence of an older granulite-facies metamorphic event predating both D1 and D2 is locally observed in the Archean gneisses. In order to resolve the nature and timing of metamorphism and deformation on Hall Peninsula, and implications for Paleoproterozoic tectonics within the Trans-Hudson Orogen, this report outlines the framework for a detailed pressure-temperature-time-deformation (P-T-t-d) analytical study.
GEOSCAN ID292132

 
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