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TitlePreliminary observations on the nature and origin of the eastern orthogneiss complex of southern Hall Peninsula, Baffin Island, Nunavut
AuthorFrom, R E; Camacho, A L; St-Onge, M R
SourceCanada-Nunavut Geoscience Office, Summary of Activities 2012, 2013 p. 43-54 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20120342
PublisherCanada-Nunavut Geoscience Office
File formatpdf
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 setting; tectonic environments; metamorphism; deformation; magmatism; Archean; orthogneisses; igneous rocks; tonalites; granodiorites; monzo-granites; granites; gabbros; 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. Southern Hall Peninsula on Baffin Island, in Nunavut, has been separated into eastern and western domains in accordance with observations made during the 2012 field season. A large orthogneiss complex dominates the eastern domain of Hall Peninsula, consisting of tonalitic gneiss that contains enclaves of mafic to ultramafic rocks and that is variably intruded by granodiorite, monzogranite, syenogranite and granitic pegmatite bodies. Reconnaissance geochronology work by Scott (1999) identified multiple tonalitic gneiss sequences in eastern Hall Peninsula to be Archean. This tonalitic gneiss is very similar in age and appearance to Archean tonalitic to granitic gneiss found elsewhere throughout Baffin Island and the subarctic region as a whole (St-Onge et al., 2009). The Archean gneisses and metasedimentary cover rocks of Baffin Island have been correlated with other adjacent crustal blocks, such as the Meta Incognita microcontinent (St-Onge et al., 2009) and the Aasiaat domain of west-central Greenland (Scott 1999; Hollis et al., 2006; Thrane and Connelly, 2006). With many of these terrane correlations appearing to converge on Hall Peninsula, the rocks of this peninsula may provide insight into better defining the regional tectonic assembly of northeastern Canada and the paleo-reconstruction of the Archean terranes. Research goals over the next few years will be to determine through detailed petrological, geochemical and geochronological studies the extent and characteristics of the voluminous orthogneiss complex on the peninsula,whereas its origin and source will be examined through Nd-isotopic analyses. Intrusive rocks that pierce crustal rocks at depth inherit the unique Nd-isotopic signature of the underlying crust, allowing comparison to Nd-isotopic data from the subarctic region. These basic data andmaps will be beneficial to themineral exploration industry, as well as to the local indigenous people of Nunavut who rely on the carvingstone trade for their livelihood.

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