100°0'0"W 90°0'0"W 80°0'0"W 70°0'0"W 6 17N 18N 19N 20N 7 1:2 000 000 Scale Geological 25 29 Compilation of the Superior Craton 28 Montsion, R.M., Thurston, P., Ayer, J. 17 11 14 ¯ 1Mineral Exploration Research Centre, Harquail School of Earth Sciences, Laurentian University, Sudbury, Ontario 3 *[email protected] , Willet Green Miller Centre, Rm. 4 6029, 933 Ramsey Lake Rd., P3E 6B5, Sudbury, Ontario 12 21 Disclaimer These compiled GIS layers were prepared for the sole purpose 13 22 9 23 18 of portraying recent, publically available bedrock geology 19 layers of the Superior Craton at 1:2 000 000 scale. It should 60°0'0"N 20 !( not be used for any other purpose. Use of this compilation !( 28 10 !( map/dataset is governed by the following principles: 8 26 1 32 15!( !( !( !( !( 2 1) The compilation map is scale dependent. Use of the !( !(!( 31 !( !( 15 8 2 30 24 information from the compilation at any scale other than !( !( !( 55°0'0"N 1:2 000 000 is unwarranted and will result in erroneous 26 5 !( conclusions. 30 !( 2) To enable the rapid dissemination of information, this digital compilation has not received a thorough technical edit. 16 Discrepancies may occur for which the Mineral Exploration Research Center does not assume liability. 14N 15N 16N The compilation does not fully portray the complex geology of the Superior Craton and users should verify critical information. 3) New data and observation are continually collected, synthesized and compiled. Users should be aware that the digital compilation was current at time of posting, but 55°0'0"N new information may substantially change the MANITOBA interpretation in any area. Users should verify the currency of data in any area before proceeding. Users are also directed to check the Metal Earth Website http://merc.laurentian.ca/metalearth/superior_compilation) for future updates and any newer versions of this map compilation 50°0'0"N 4) The GIS layers were prepared from compilation of available Chibougamau ONTARIO province/state-scale products from relevant public ! surveys. These maps were updated within the confines of the available time with information collected post–1990. Red Matagami No attempt was made to check source material published Lake ! prior to the creation of the manuscript maps. ! 5) The geology was subdivided to aid identification of QUEBEC economically important rock units. Kapuskasing Rouyn- QUEBEC Winnipeg Geraldton ! Kenora Dryden ! Noranda ! Val-d'Or ! ! For legend and addtional information related to this map, 50°0'0"N Kirkland ! ! ! see the Metal Earth website ! Lake Timmins ! Malartic (http://merc.laurentian.ca/metalearth/superior_compilation) Thunder Bay Wawa ! ! ! Cobalt Sault 45°0'0"N N. Sudbury ! Ste. Marie DAKOTA MINNESOTA ! MICHIGAN WISCONSIN 1:11,000,000 NAD 1983 CSRS Canada Lambert WKID 3979 0 62.5 125 250 375 500 45°0'0"N S. DAKOTA Kilometers MERC-ME-2018-017 90°0'0"W 80°0'0"W pg 1 1:2 000 000 Scale Geological Compilation of the Superior Craton Legend Montsion, R.M.1, Thurston, P.1, Ayer, J.1 Montsion, R.M.1, Thurston, P.1, Ayer, J.1, 2018, 1:2 000 000 Scale Geological Compilation of the Superior Craton - Version 1: Mineral Exploration Research Centre, Harquail School of Earth Sciences, Laurentian University Document Number MERC-ME-2018-017 1Mineral Exploration Research Centre, Harquail School of Earth Sciences, Laurentian University, Sudbury, Ontario *[email protected], Willet Green Miller Centre, Rm. 6029, 933 Ramsey Lake Rd., P3E 6B5, Sudbury, Ontario Abstract In general, older bedrock units are named after younger ones. The Superior Craton is the world's largest Archean craton and has been the Towns and cities Political boundaries subject of geologic research for over 100 years. The craton is comprised of Highways (inset map only) UTM zone boundaries amalgamated fault bounded, lithotectonic subprovinces that trend northeast to southwest. Subprovinces alternate between granite-greenstone regions and Fault traces Boundary of the Superior Craton high-grade gneissic blocks, separated by metasedimentary-dominated Canada - United States border (exposed at surface) domains. The 1:2 000 000 scale compilation presented here integrates recent Waterbodies Area of interest province/state-scale mapping products from public domain sources for the (50 km buffer to Superior Craton) Superior Craton. The geospatial dataset includes Precambrian bedrock geology layers and geophysical grids. Original work contained within the compilation Tectonic Subdivisions (inset map only) include new interpretations such as updated subprovince boundaries, 1 Abitibi 17 Minto reclassified lithologies into a standardized legend and classification of fault 2 Animikie Basin 18 Nemiscau traces based on scale. Compilation work was done in collaboration with the 3 19 Ministère de l'Énergie et des Ressources Naturelles, Ontario Geologic Survey, Ashuanipi North Caribou Core Minnesota Geological Survey, Manitoba Mineral Resources, and Geological 4 Beinville 20 Opatica Survey of Newfoundland and Labrador. The map provides a basis for future 5 Cobalt Embayment 21 Opinaca craton-scale and thematic projects within the Superior Craton as it presents 6 Diana 22 Oxford-Stull recent regional mapping products throughout the craton and across political 7 Douglas Harbour 23 Oxford-Stull / Uchi boundaries. 8 Eastern Wabigoon 24 Pontiac Acknowledgements 9 Eastmain 25 Qalluviartuuq This map product was undertaken as part of the Metal Earth project and was 10 English River 26 Quetico funded, in part, by the Canada First Research Excellence Fund (CFREF). 11 Goudalie 27 Tikkerutuk Metal Earth is an academically-led project through the Mineral Exploration 12 Hudson Bay Terrane 28 Uchi Research Centre (MERC) at Laurentian University. 13 Island Lake 29 Utsalik Special thanks to our research partners, the Ministère de l'Énergie et des 14 La Grande 30 Wawa Ressources Naturelles, Ontario Geologic Survey, Minnesota Geological 15 Marmion 31 Western Wabigoon Survey, Manitoba Mineral Resources, and Geological Survey of Newfoundland 16 Minnesota River 32 Winnipeg River and Labrador, for their contribution of datasets through their public, online Valley portals as well as correspondence and collaboration. This product was significantly improved through assistance and support from Metal Earth technical staff, Ryan Paquette and Jacqueline Edwards. Additionally, the various researchers working on the Metal Earth project contributed through stimulating discussion during the course of the project. MERC-ME-2018-017 pg 2 PHANEROZOIC (present - 542.0 Ma) metasedimentary rocks (sandstone to coarse QUATERNARY (present - 2.58 Ma) conglomerate), with minor, mainly alkali, mafic to felsic 17us Unconsolidated Quaternary sediments metavolcanic flows, tuffs and breccias PALEOZOIC (251.0 Ma - 542.0 Ma) 12sf Fine grained clastic metasedimentary rocks: Wacke, arkose, argillite, Carbonate units2 slate, marble, chert, minor metavolcanic layers 16cu Unsubdivided carbonate 12sm Migmatized supracrustal rocks: Migmatized metasedimentary rocks 16cd Dolomite with minor migmatized metavolcanic content 16cl Limestone Metavolcanic units2 PRECAMBRIAN1 (0.542 Ga - <3.85 Ga) 11vu Unsubdivided metavolcanic units: Based on reconnaissance mapping PROTEROZOIC (0.542 Ga - 2.50 Ga) – largely mafic Impactites2 11vm Mafic to ultramafic metavolcanics: Mafic metavolcanic rocks with 15is Sudbury units (1.85 Ga) minor komatiite, minor metasedimentary, and minor 15ic Carbonatites *Age varies. Varies from broadly gabbroic units to pyroclastic rocks suevite 11vi Mafic to intermediate metavolcanics: Basaltic and andesitic flows, Granitoids2 tuffs and breccias, chert, iron formation, minor 14gu Unsubdivided granitoid units: Includes all units listed below in areas metasedimentary and intrusive rocks, related migmatites without detailed maps 11vf Felsic to intermediate metavolcanics: Rhyolitic, rhyodacitic, dacitic 14gg Massive granodiorite to granite: Massive to foliated granodiorite to and andesitic flows, tuffs and breccias, chert, iron granite formation, minor metasedimentary and intrusive rocks; 14gd Diorite-monzonite- granodiorite suite: Diorite, tonalite, monzonite, related migmatites granodiorite, syenite and hypabyssal equivalents ARCHEAN (2.5 Ga - <3.85 Ga) 14gm Muscovite-bearing granitic rocks: Muscovite-biotite and cordierite- Granitoids2 biotite granite, granodiorite-tonalite 4gu Unsubdivided granitoid units: Includes all units listed below in areas 14gf Foliated tonalite suite: Tonalite to granodiorite – foliated to massive without detailed maps 14gt Gneissic tonalite suite: Tonalite to granodiorite – foliated to gneissic – 4gn Diorite-Nepheline syenite suite: Pyroxenite, diorite, monzonite, with minor supracrustal inclusions syenite, nepheline syenite 14gp Pyroxene-bearing granitic rocks: Granitic rocks containing pyroxene, 4go Granitic orthogneiss and migmatite: Granitic orthogneiss and including charnokites, enderbites etc. migmatite units from the Minnesota River Valley Gneiss Mafic and ultramafic intrusions2 (MRVG) suite. Possibly later than other MRVG units listed 13mu Unsubdivided mafic and ultramafic intrusions: Generally based on below. geophysical interpretation 4gga Massive granodiorite to granite: Massive to foliated granodiorite to 13mm Mafic intrusions: Gabbroic units, fine to coarse grained granite 13mi Ultramafic intrusions: Vary from anorthosite to various pyroxene- 4ggb Granitoid gneiss with dioritic to amphibolitic enclaves: Granitoid bearing units to dunite gneiss from the Minnesota River Valley Gneiss suite. Clastic metasedimentary2