Identification_Information: Citation: Citation_Information: Originator: Jackson, G.D. Publication_Date: 2013 Title: Belcher Islands Edition: 1.0 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Open File Issue_Identification: 4923 Publication_Information: Publication_Place: Ottawa, Ontario, Canada Publisher: Natural Resources Canada, Earth Sciences Sector, Geological Survey of Canada Other_Citation_Details: Recommended citation: 2013: Jackson, G.D., 2013. Geology, Belcher Islands, Nunavut; Geological Survey of Canada, Open File 4923, scale 1:125 000. Online_Linkage: Description: Abstract: Abstract of4923 Basement rocks are not exposed on the Belcher Islands, but might be relatively close to the surface below Tukarak Island and east of Laddie Island. The initial miogeoclinal stage of the Belcher Group is represented by the 1200 m thick Kasegalik Formation composed mostly of evaporitic and stromatolitic dolostones deposited on a transgressive-carbonate shelf or platform that sloped west to southwest. Depositional environments range upward from supratidal and evaporitic at the bottom to shallow subtidal near the top. Sedimentation was halted by abrupt extrusion of the Eskimo contaminated, tholeiitic, continental basalts, possibly at 1960 ma. They thicken north-northeast to 950 m at Eskimo Harbour and extrusion ended almost as abruptly as it began. They are coeval and likely correlative with the Persillon and Nastapoka mainland tholeiitic basalts and the Qingaaluk Formation in the Richmond Gulf Graben, based mainly on chemistry and paleopole positions. Sedimentation during the second miogeoclinal stage followed the volcanism, but was carried out in a more unstable environment than the first miogeoclinal stage. The first six formations of the second stage (Fairweather - Laddie, about 1730 m) were deposited in cyclic fashion on a west- to southwest-dipping transgressive carbonate shelf or platform. Strata include clastic and stromatolitic dolostones and minor limestones, mudstones to quartzarenites and local channel conglomerates. Depositional environments range from supratidal to subtidal, slope and basin. Fantastic stromatolite buildups, large biohermal domes, thin-, rhythmically- interlayered dolostone and limestone and soft-sediment deformation in slope deposits are present. Deposition of the top three formations (Rowatt-Kipalu, about 560 m) of the second miogeoclinal stage changed to progradation in a restricted basin. Sedimentation ranged from a tidal flat carbonate buildup to deposition of the Kipalu iron-formation in slightly deeper water in a restricted environment. The second miogeoclinal stage was terminated as abruptly as the first stage by the extrusion of the Flaherty slightly contaminated contintental, tholeiitic basalts. These flows are part of a magmatic belt that extends from west of the Sutton Inlier east and north to the Cape Smith Belt and beyond. Thicknesses range from 200 m on eastern Tukarak Island to at least 1650 m in the western Belchers. The flows were accompanied by intrusion of the Haig diabase-gabbro sills and a few dykes in all of the underlying formations and are not known to be present in the uppermost part of the Flaherty Formation. Precise, identical baddeleyite ages of 1870 Ma for two Haig sills, chemical data and paleopole positions indicate the sills are the same age as and are probably all related to the Flaherty volcanism. These data help to correlate these flows and sills and the underlying Flaherty Iron-Formation and Mukpollo quartzarenite with similar strata present in the Sutton Inlier, along the offshore islands of the Nastapoka Arc and on the Sleeper Islands. Accumulation of the volcanic pile to the west led to depression of the land to the east, changed the paleoslope from southwesterly to easterly and helped to transform the miogeoclinal stage into a foredeep of a foreland basin system. When volcanism ceased, the foredeep continued to be depressed and the thick turbidite greywacke flysch of the Omarolluk Formation (about 3300 m) was deposited in a submarine fan. As the basin began to fill, deep water deposits graded upward into shallow-water crossbedded arkoses of the Lower Loaf Member (about 500 m), that underlie most of the Bakers Dozen and King George islands. They are interpreted to be fluvial and shallow marine distal molasse strata and are overlain on a few Bakers Dozen Islands by about 215 m of mostly red and pink crossbedded arkoses interpreted to be terrestrial molasse. Deposition of molasse has been taken to indicate overfilling of the basin and these strata may be close to the original top of the Belcher Group. Most of the region in the southeastern Hudson Bay embayment that is under water is interpreted to be underlain by little-deformed Upper Omarolluk and Lower Loaf members. Field, topographic, and geophysical data indicate that relatively intense folding dies out abruptly east of a line extending south from the north end of the Nastapoka Arc along the Marcopeet and Sleeper islands. Continuing southerly, the line becomes arcuate and convex to the east as it passes southeast by the North Belcher Islands.to the north end of Tukarak Island whereit turns south and finally south-southwest toward the northeast corner of James Bay. The relatively intense deformation west of this arcuate belt in the southern part of the southeast Hudson Bay embayment is interpreted to have resulted from forces acting in a southeast direction. The thrusting resulting from two continental masses colliding has been interpreted to have terminated just west of the Belchers, except for movement along a sole fault or decollement that may have continued to east of the "eastern islands". This movement may have been facilitated by occurring along a relatively low topographic belt that may mark the extension westward of the Richmond Gulf Graben (Aulacogen) to the Belcher Islands. Most of the region in the southeastern Hudson Bay embayment that is under water and east of the deformed belt is interpreted to be underlain by little-deformed Upper Omarolluk and Lower Loaf members. This is substantiated by the little-deformed nature of the islands examined in a large part of this region. The features noted above are probably considerably younger than the Nastapoka Arc and suggest that the intense deformation to the west of the line noted above is younger than the Nastapoka Arc and had little to do with the latter's formation. The Flaherty Iron-Formation has received considerable attention in the past, and exploration has recently been active again. Sizeable areas underlain by the iron-formation are drift covered, although indications of leaching and enrichment in outcrop areas are meagre. The drift is probably not thick and trying modern geophysical methods and drilling a few shallow holes might be worthwhile. Some drilling of copper showings was not encouraging, although hand-size specimens (10-15 cm across), looked interesting. Some traces of anthraxolite occur at a few localities, but have not been reported by others. However, they are probably not indicative of the presence of a subsurface hydrocarbon deposit. Purpose: Supplemental_Information: Data set is in English. Magnetic declination stated in degrees and minutes. Annual change stated in minutes. Magnetic declination at NW corner of map: 16°21'W, changing 8.3'E annually. Magnetic declination at SW corner of map: 15°17'W, changing 6.8'E annually. Magnetic declination at NE corner of map: 17°58'W, changing 10'E annually. Magnetic declination at SE corner of map: 16°52'W, changing 8.3'E annually. Magnetic declination at center of map: 16°38'W, changing 8.3'E annually. Number of base data sets used: 2 Base data set 1: Source is NTDB, ID is 33D&44A, version N/A, N/A, scale 1:250000 Base data set 2: Source is NTDB, ID is 33M&43P, version N/A, N/A, scale 1:250000 Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1979 Range_of_Dates/Times: Beginning_Date: 1958 Ending_Date: 1979 Currentness_Reference: Field work years are 1958,1959,1976,1977. Compilation years are 1979. Status: Progress: Complete Maintenance_and_Update_Frequency: None Planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -80.250 East_Bounding_Coordinate: -78.250 North_Bounding_Coordinate: 57.000 South_Bounding_Coordinate: 55.500 Data_Set_G-Polygon: Data_Set_G-Polygon_Outer_G-Ring: G-Ring_Point: G-Ring_Latitude: 57 G-Ring_Longitude: -80.2500 G-Ring_Point: G-Ring_Latitude: 57 G-Ring_Longitude: -78.2500 G-Ring_Point: G-Ring_Latitude: 55.5000 G-Ring_Longitude: -78.2500 G-Ring_Point: G-Ring_Latitude: 55.5000 G-Ring_Longitude: -80.2500 G-Ring_Point: G-Ring_Latitude: 57 G-Ring_Longitude: -80.2500 Keywords: Theme: Theme_Keyword_Thesaurus: %string% Theme_Keyword: geoscientific information Theme_Keyword: geological and geophysical Theme_Keyword: Geology Place: Place_Keyword_Thesaurus: %string% Place_Keyword: North Belcher Islands Place_Keyword: Sleeper Islands Place_Keyword: Snape Island Place_Keyword: Tukarak Island Place_Keyword: Omarolluk Sound Place_Keyword: Kasegalik Lake Place_Keyword: Flaherty Island Place_Keyword: Moore Island Place_Keyword: Churchill Sound Place_Keyword: Kugong Island Place_Keyword: Split Island Place_Keyword: King George Islands Place_Keyword: Bakers Dozen Islands Place_Keyword: Salikuit Islands Place_Keyword: Hudson Bay Place_Keyword: Belcher Islands Place_Keyword: Nunavut Access_Constraints: None Use_Constraints: Her Majesty the Queen in Right of Canada 2013 Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Natural Resources Canada, Earth Sciences Sector, Data Management and Dissemination Branch, Data Dissemination Division Contact_Position: Copyright Information Officer Contact_Address: Address_Type: Mailing and Physical Address: 615 Booth Street Address: Room 644B City: Ottawa State_or_Province: Ontario Postal_Code: K1A 0E9 Country: Canada Contact_Voice_Telephone: +01-613-947-6275 Contact_Facsimile_Telephone: +01-613-947-2410 Contact_Electronic_Mail_Address: ESSCopyright@NRCan.gc.ca Data_Set_Credit: Additional geology by Cooper, G.E., Manos, G., Ricketts, B.D. and Donaldson, J.A. Digital cartography by Everett, E. Data_Quality_Information: Lineage: Source_Information: Source_Scale_Denominator: 125000 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 17 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -81.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 1.0 Ordinate_Resolution: 1.0 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.9786982139058207616105371232 Distribution_Information: Distributor: This publication is available for free download through GEOSCAN (http://geoscan.ess.nrcan.gc.ca/). 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