Identification_Information: Citation: Citation_Information: Originator: Tella, S. Publication_Date: 1994 Title: Amer Lake (66H), Deep Rose Lake (66G) and parts of Pelly Lake (66F) Edition: 1.0 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Open File Issue_Identification: 2969 Publication_Information: Publication_Place: Ottawa, Ontario Publisher: Geological Survey of Canada, Natural Resources Canada Other_Citation_Details: Recommended citation: Tella, S. 1994: Geology, Amer Lake (66H), Deep Rose Lake (66G) and parts of Pelly Lake (66F), District of Keewatin, Northwest Territories; Geological Survey of Canada, Open File 2969, scale 1:250 000. Online_Linkage: Description: Abstract: This open file consists of three 1:250 000 scale preliminary geological maps (Amer Lake, 66H; Deep Rose Lake, 66G; Parts of Pelly Lake, 66F). Bedrock mapping was completed during the field seasons 1976 through to 1983. This compilation map incorporates additional data from topical studies carried out by several previous workers. Neoarchean granulite, garnet-biotite paragneiss, mafic schist and minor amphibolite appear to be the oldest rocks in the Amer Lake (66H) region. The oldest supracrustal rocks in the region are metamorphosed layered rocks, intermediate to mafic volcanic rocks, greywacke, chlorite schist, banded iron formation, with subordinate chert, carbonate, and quartzite. Zircon fractions from a dacite porphyry yielded a U-Pb upper concordia intercept age of 2801 +/- 20 Ma. Although considerable controversy exists as to the age of quartzites in the the Amer Lake area (66H), recent studies confirm an Archean age for these quartzites. Archean, spinifex textured, komatiitic rocks are associated with the above supracrustal rocks. Deformed supracrustal rocks of uncertain age, in part consisting of stromatolite bearing units, occur in the Deep Rose Lake map area (66G). Other rock units that range in composition from diorite to granite occur throughout the region, and collectively they represent a basement complex to the deformed and metamorphosed supracrustal rocks of the Paleoproterozoic Amer group. Zircon fractions from a granite from this basement complex yielded a U-Pb upper concordia intercept age of 2617 +/- 20 Ma. The Paleoproterozoic Amer group is dominately made up of two clastic sequences- a lower conglomerate-orthoquartzite and an upper feldspathic sandstone-arkose-siltstone, carbonate, and mudstone-siltstone-sandstone rhythmite. Stratabound uranium mineralization occurs within the upper parts of the transitional sequence. The intensity of deformation within the rocks of the Amer group increases from southwest to northeast with a corresponding increase in metamorphic grade from subgreenschist to lower amphibolite facies. Several north-northwesterly transported thrust sheets have been mapped within the lower Amer group strata. The Amer group was intruded by a younger suite of granite-syenite plutons. Zircon fractions form a syenite intrusion yielded a U-Pb upper concordia intercept age of 1849 +/- 18 Ma. Paleohelikian clastic rocks of the Thelon Formatio unconformably overlie the granitoid basement complex and the Amer group. Northeast-trending ductile high-strain zones (e.g., Amer mylonite zone), and northwest-trending brittle faults affect both the basement and the cover rocks. At least two periods of displacement occurred along the Amer mylonite zone, and that the latest movement (with a dextral sense of displacement) could be as young as ca. 1.7 Ga. 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: 11°29'E, changing 25.9'W annually. Magnetic declination at SW corner of map: 11°21'E, changing 23.5'W annually. Magnetic declination at NE corner of map: 1°51'W, changing 11.3'W annually. Magnetic declination at SE corner of map: 0°56'W, changing 11.3'W annually. Magnetic declination at center of map: 5°12'E, changing 18.8'W annually. Proximity of the North Magnetic Pole causes the compass to be erratic in this area. Number of base data sets used: 3 Base data set 1: Source is NTDB, ID is parts of 66F, scale 1:250000 Base data set 2: Source is NTDB, ID is 66G, scale 1:250000 Base data set 3: Source is NTDB, ID is 66H, scale 1:250000 Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Range_of_Dates/Times: Beginning_Date: 1976 Ending_Date: 1994 Currentness_Reference: Field work years are 1976, 1978, 1979, 1980, 1981, 1982, 1983. Compilation years are 1994. 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G-Ring_Longitude: -99.9985 G-Ring_Point: G-Ring_Latitude: 65.9182 G-Ring_Longitude: -99.9989 G-Ring_Point: G-Ring_Latitude: 65.9245 G-Ring_Longitude: -100.0019 G-Ring_Point: G-Ring_Latitude: 65.9308 G-Ring_Longitude: -100.0038 G-Ring_Point: G-Ring_Latitude: 65.9540 G-Ring_Longitude: -100.0080 G-Ring_Point: G-Ring_Latitude: 65.9582 G-Ring_Longitude: -100.0078 G-Ring_Point: G-Ring_Latitude: 65.9687 G-Ring_Longitude: -100.0046 G-Ring_Point: G-Ring_Latitude: 65.9793 G-Ring_Longitude: -100.0030 G-Ring_Point: G-Ring_Latitude: 65.9898 G-Ring_Longitude: -100.0022 G-Ring_Point: G-Ring_Latitude: 66.0000 G-Ring_Longitude: -100.0033 G-Ring_Point: G-Ring_Latitude: 66.0000 G-Ring_Longitude: -98.2183 Keywords: Theme: Theme_Keyword: geoscientificInformation Theme_Keyword: Geological and geophysical Theme_Keyword: Geology Theme_Keyword_Thesaurus: None Place: Place_Keyword: Naujatuuq Lake Place_Keyword: Meadowbank River Place_Keyword: Amer Lake Place_Keyword: Buliard Lake Place_Keyword: Lower Macdougall Lake Place_Keyword: Deep Rose Lake Place_Keyword: Sand Lake Place_Keyword: Back River Place_Keyword: Lower Garry Lake Place_Keyword: Garry Lake Place_Keyword: Upper Garry Lake Place_Keyword: Ditrict of Keewatin Place_Keyword: Northwest Territories Place_Keyword_Thesaurus: None Access_Constraints: None Use_Constraints: Her Majesty the Queen in Right of Canada 1994 For more information, please contact the Copyright Officer at the following address: ESS Copyright Officer Business Development Office Earth Sciences Sector 615 Booth St., Ottawa, Ontario K1A 0E9 Sa Majesté la Reine du chef du Canada 1994 Pour plus d'information, prière de communiquer avec le responsable du droit d'auteur à l'adresse suivante : Responsable du droit d'auteur du SST Bureau d'expansion des affaires Secteur des sciences de la Terre 615, rue Booth Ottawa (Ontario) K1A 0E9 Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Subhas Tella Contact_Organization: Natural Resources Canada Contact_Address: Address_Type: Physical Address: 601 Booth Street City: Ottawa State_or_Province: Ontario Postal_Code: K1A 0E8 Country: Canada Contact_Voice_Telephone: 613-995-4926 Contact_Facsimile_Telephone: 613-995-7997 Contact_Electronic_Mail_Address: Subhas.Tella@nrcan-rncan.gc.ca Data_Set_Credit: Additional geology by Thompson, D.L., James, D.T., Ashton, K.E., Miller, A.R., Roddick, J.C.M., Heywood, W.W., Tippett, C.R., Annesley, I.R., Patterson, J.G., Barrett, K.R., Laporte, P.J., Schaub, P. and Knox, A.W. Digital cartography by Allard, R.L. 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