The Bear Lake suite of the Paleoproterozoic Flin Flon Arc Assemblage consists of a large basaltic andesite shield volcano crowned by a caldera containing effusive to volcaniclastic rhyolite to andesite flows and a thick pelitic unit, the latter which hosts the
White Lake and Cuprus volcanogenic massive sulphide deposits (VMS). The Bear Lake suite is also host to an extensive zone of epidote-enriched synvolcanic hydrothermal alteration over 11 km by 3 km in dimension. This alteration zone is similar in size to that of the VMS-rich Archean Noranda cauldron
succession and yet contains an exponentially smaller VMS tonnage. Detailed mapping and geochemical analysis of the alteration zone indicates redistribution of large amounts of base metals unaccounted for in the presently known VMS deposits, suggesting good base metal exploration potential still
exists within this oceanic arc succession.
This map and the related geodatabase illustrate the bedrock geology of central and eastern Prince of Wales Island, Somerset Island, and northern Boothia Peninsula. Major features of the area include Archean and Paleoproterozoic granitoid and metasedimentary rocks
of Boothia Uplift overlain unconformably by Paleoproterozoic and Mesoproterozoic sediments, which are, in turn, unconformably overlain by Cambrian to Devonian strata of Arctic Platform. The higher Silurian and Lower Devonian interval provides a multiphase depositional record of Boothia Uplift.
Youngest events are recorded by Cretaceous kimberlite diatremes and outliers of Paleogene strata.
Foreword
The Geo-mapping for Energy and Minerals (GEM) program is laying the foundation for sustainable economic development in the North. The Program provides modern public geoscience that will set the stage for long-term decision making related to investment in responsible resource development. Geoscience
knowledge produced by GEM supports evidence-based exploration for new energy and mineral resources and enables northern communities to make informed decisions about their land, economy and society. Building upon the success of its first five-years, the program has been renewed (GEM-2) until 2020 to
continue producing new, publically available, regional-scale geoscience knowledge in Canada's North.
During the summer 2016, GEM-2 successfully carried out 17 research activities that included geological, geochemical and geophysical surveying. Many of these were undertaken in collaboration with provincial and territorial governments, northerners and their institutions, academia and the private
sector. GEM-2 will continue to work with these key collaborators as the program advances.
The Geo-mapping Frontiers project was initiated to improve geoscience knowledge in the least understood parts of Canada's north. Open File 7434 is part of a series of open files, 7434 to 7448, produced during the Geo-mapping Frontiers project. The series contains
legacy geology data and remote predictive mapping information for a large part of eastern mainland Nunavut, collected over 2 years.
The derived data products from this work are presented in 15 separate thematic packages to keep the downloads to a manageable size, between 1 and 4 GB. ArcGIS users (version 9.3 and above) can download OF 7434 and any of the georeferenced raster data in the rest of the series. Users not interested
in geodatabases will find data in shape files in Open Files 7434 and 7435, or in georeferenced raster data in the rest of the series.
This series of publications represents a compilation of available data sets for four regions, and their surrounding areas, that encompass a large part of eastern mainland Nunavut. Several interpretive Remote Predictive Mapping (RPM) layers are included. The data sets include airborne geophysics,
LANDSAT 7 imagery, lake sediment analyses, as well as legacy mapping and sample data from the Geological Survey of Canada (GSC) archives.
This series is the first of a group of reports for the Geo-mapping Frontiers project, and is intended to provide a basis of knowledge for the entire region.
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