| Title | Delimiting the extent of 'Boothia terrane' crust, Nunavut: new U-Pb geochronological results |
| Download | Downloads |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Regis, D; Sanborn-Barrie, M |
| Source | Geological Survey of Canada, Open File 8917, 2022, 17 pages, https://doi.org/10.4095/330703  Open Access |
| Image |  |
| Year | 2022 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | digital; on-line |
| Related | NRCan photo(s) in this
publication |
| File format | readme
|
| File format | pdf |
| Province | Nunavut |
| NTS | 57C/09; 57C/10; 57C/11; 57C/12; 57C/13; 57C/14; 57C/15; 57C/16; 57F; 57E/01; 57E/05; 67E/01; 67E/08; 67E/09; 67E/16; 67H/01; 67H/08; 57G; 58B; 58C; 58F/04; 58F/03; 58F/02; 58F/01; 58A/13; 58D/04; 58D/05;
58D/11; 58D/12; 58D/13; 58D/14; 58E/03 |
| Area | Somerset Island |
| Lat/Long WENS | -98.0000 -90.0000 74.1667 69.5000 |
| Subjects | Science and Technology; mineralogy; Nature and Environment; geochronology; geochemistry; uranium lead dating; Boothia Peninsula; Petrology |
| Illustrations | location maps; photographs; charts; diagrams |
| Program | GEM-GeoNorth: Geo-mapping for Energy and Minerals GEM Program Coordination |
| Released | 2022 10 03 |
| Abstract | The Boothia Peninsula - Somerset Island region of north-central Nunavut is a frontier region (70-74°N, 94°W) long considered as part of Rae craton. Recent field mapping and acquisition of isotopic
(U-Pb, Sm-Nd) data as part of the GEM-2 Boothia-Somerset project allowed this region's exposed Precambrian bedrock to be better characterized with respect to petrology and litho-geochemistry, and to be more extensively and more precisely
time-calibrated. The discovery of unique, possibly exotic, basement characterized by a ca. 2.55-2.51 Ga TTG suite overlain by ca. 2.5 Ga metasedimentary rocks, cut by 2.49- 2.48 Ga plutons, are all atypical components of the Archean Rae crust. This
new knowledge and the hint of similar 'Boothia terrane' crust south of Boothia Peninsula (Ryan et al., 2009), east of the Queen Maud block (Davis et al., 2014) in central Nunavut, and in northernmost Saskatchewan (Cloutier et al., 2021), raised the
possibility this terrane may extend >1600 km across north-central Canada. During the foundational year of GEM-GeoNorth, the extent of Boothia terrane crust was explored through legacy samples collected during the 2012 GEM Frontiers' transect across
mainland Nunavut. As part of this new study, field descriptions, photographic records and legacy samples were examined, and new U-Pb zircon geochronology was acquired. The new data and knowledge were used to: i) identify new components of Boothia
terrane on the mainland southwest of Boothia Peninsula; ii) further distinguish this crust from that of Rae affinity; and iii) better constrain the depositional age of Sherman Group metasedimentary rocks. |
| Summary | (Plain Language Summary, not published)
During the Foundational Year of GEM-GeoNorth, the extent of Boothia-Somerset geological terrane was investigated through legacy samples collected during
the 2012 GEM Frontiers' Transect across mainland Nunavut. Field descriptions, photographic records and legacy samples were examined, and new U-Pb zircon geochronology was acquired. The new data was used to identify components of Boothia terrane on
the mainland and call into question the depositional age of the Sherman basin. |
| GEOSCAN ID | 330703 |
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