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Ontario Geological Survey 1991. Bedrock geology of Ontario, southern sheet; Ontario Geological Survey, Map 2544, scale 1: 1 000 000.
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Ministry of Northern Development and Mines Ontario MAP 2544 BEDROCK GEOLOGY OF ONTARIO
SOUTHERN SHEET
Greene I
NEO-ARCHEAN (2.5 to 2.9 Ga) SUPRACRUSTAL ROCKS Coarse clastic metasedimentary rocksr: mainly coarse clastic metasedimentary rocks, with minor, mainly alkalic, mafic to felsic metavolcanic flows, tuffs and breccias ©Queen's Printer for Ontario, 1991. NEO- TO MESOARCHEAN (2.5 to 3.4 Ga) This map published with the permission of V.G. Milne, Di• SUPRACRUSTAL ROCKS rector, Ontario Geological Survey. Migmatized supracrustal rockseg: metavolcanic rocks, minor metasedimentary rocks, mafic gneisses of This map is one of a set published to mark the 1991 cen• uncertain protolith, granitic gneisses tennial of the establishment of an Ontario Bureau of eg Mines. It was produced specifically to accompany The Metasedimentary rocks : wacke, Geology of Ontario, Ontario Geological Survey, Special arkose, argillite, slate, marble, chert, iron Volume 4. formation, minor metavolcanic rocks 7a Paragneisses and migmatitess 7b Conglomerate and arenite Pour une version française de la légende et des notes Felsic to intermediate metavolcanic marginales de cette carte, prière de se référer aux Notes rocksgt: rhyolitic, rhyodacitic, dacitic and explicatives et Légende (carte OGS 2545). andesitic flows, tuffs and breccias, chert, iron formation, minor metasedimentary and intrusive rocks; related migmatites Mafic to intermediate metavolcanic rocksgt: basaltic and andesitic flows, tuffs and breccias, chert, iron formation, SOURCES OF INFORMATION minor metasedimentary and intrusive rocks, related migmatites Geology compiled from published and unpublished maps and reports of the Ontario Geological Su rvey and the Geo• 5a Andesitic flows, tuffs and breccias u logical Survey of Canada, and unpublished data on file with minor rhyolites with the Ontario Geological Survey. Data on thegeology of Mafic to ultramafic metavolcanic immediately adjoining areas of adjacent provinces and rocksS': mafic metavolcanic rocks with states were provided by geologists of the government sur• minor komatiite, minor metasedimentary vey organizations of those jurisdictions, as noted in the and pyroclastic rocks Explanatory Notes and Legend (OGS Map 2545). MESOARCHEAN (2.9 to 3.4 Ga)v Base map assembled by the Ontario Geological Survey. SUPRACRUSTAL ROCKS Geographic information, derived from maps 21-6, 22-6, Mafic metavolcanic and
23-6, 24-6, 25-6, 26-6, 27-6 and 28, by the Surveys and t Mapping Branch, Ontario Ministry of Natural Resources, metasedimentary rocks : mafic was compiled onto a Lambert Conformal Conic grid with metavolcanic rocks, minor iron formation MESO- TO PALEOPROTEROZOIC standard parallels 49° N and 77° N, central meridian Felsic to intermediate metavolcanic 92° W and grid origin 92° W 0° N provided by Dataplotting (0.9 to 2.5 Ga) rockst: rhyolitic, rhyodacitic, dacitic and Services, Markham, Ontario. Felsic intrusive rocks andesitic flows, tuffs and breccias For information as to the status and extent of all restricted 27a Granite, alkali granite, granodiorite, Metasedimentary rocks and mafic to lands in Ontario, users are referred to the provincial or fed• quartz feldspar porphyry; minor ultramafic metavolcanic rockstw: eral agency within whose jurisdiction the lands are admin• related volcanic rocks >'(1.4 to 1.5 Ga) coarse clastic metasedimentary rocks, istered. 27b Killarney monzogranite and granitic marble, quartz arenite, iron formation, rocksk (1.7 and 1.4 Ga) komatiite, mafic metavolcanic rocks, and Geology not tied to surveyed lines. 27c Intermediate to felsic volcanic rocksk minor felsic metavolcanic rocks (1.8 to 1.9 Ga) PALEOPROTEROZOIC (1.6 to 2.5 Ga) ACKNOWLEDGMENTS Sudbury Igneous Complex (1850 Ma): norite, gabbro, granophyre a The letter "G" preceding a map unit number indicates Digital plots of colour separations produced by Environ• MESOPROTEROZOIC (0.9 to 1.6 Ga) l lithologic information interpreted from geophysical data. mental Information Systems Division, Environment Canada. Whitewater Gp. : fragmental rocks, CENTRAL GNEISS BELT mudstone, wacke b Phanerozoic stratigraphic nomenclature varies in the Felsic igneous rocks: tonalite, Carbonatite-alkalic intrusive suite level of detail to match the variable level of detail granodiorite, monzonite, granite, syenite; (ca. 1.9 Ga): carbonatite, nepheline displayed on the map face. derived gneisses syenite, alkalic syenite, ijolite, fenite; c Unassigned. CREDITS Anorthosite and alkalic igneous rocks: associated mafic and ultramafic rocks d anorthosite, anorthositic gabbro, gabbro i Subdivisions of Precambrian geologic time and units Compilation by staff of the Precambrian Geology and En• Mafic intrusive rocks and related gneisses, nepheline syenite, characterized by a range of ages are cited in terms of gineering and Terrain Geology sections of the Ontario alkalic syenite 23a Molson swarm (1884 Ma) diabase Ga. The subdivisions of geologic time correspond to Geological Survey, as noted in the Explanatory Notes and dikes; and Sutton Inlier: diabase sills international standards as described in the marginal Legend (OGS Map 2545). Migmatitic rocks and gneisses of 23b Wabigoon swarm: diabase dikes notes. All ages of individual units cited in the legend are undetermined protolith: commonly 23c North Channel swarm: diabase dikes based on high precision U/Pb zircon ages, and are cited Cartographic production by staff of the Publication and ORDOVICIAN layered biotite gneisses and migmatites; in terms of Ma. Cartographic Services unit of the Ontario Geological Sur• UPPER ORDOVICIAN locally includes quartzofeldspathic Sedimentary rocks vey, as noted in the Explanatory Notes and Legend (OGS gneisses, orthogneisses, paragneisses m e Shale, limestone, dolostone, siltstone 22a Animikie Gp. : wacke, shale, iron Granulite grade units are shown by screened overprint. Map 2545). a formation, limestone, minor volcanic f LEGEND 52a Queenston Fm. Mafic rocks: amphibolite, gabbro, diorite, The rocks of the Central Granulite Terrane in Quebec rocks Every possible effort has been made to ensure the accura• 52b Georgian Bay Fm.; Blue Mountain mafic gneisses are coded in a lithologic sense only and represent units b 22b Sutton Inlier: dolostone, chert cy of the information presented on this map; however, the PHANEROZOIC Fm.; Billings Fm.; Collingwood Mb.; Gneisses of metasedimentary origin: ofca. 1050 to 1150 Ma in age. Equivalents of these rocks Ontario Ministry of Northern Development and Mines Eastview Mb. breccias, argillite, wacke, are not known to be present in Ontario. quartzofeldspathic gneisses, pelitic to conglomerate, iron formation does not assume any liability for errors that may occur. Us• MESOZOIC 52c LiskeardGp. semi-pelitic gneisses, calc-silicate 9 Rocks in these groups are subdivided lithologically. The ers may wish to verify critical information. CRETACEOUS AND JURASSIC 52d Red Head Rapids Fm. gneisses, minor quartzite, minor marble i Mafic and related intrusive rocks order does not imply age relationship within or among LOWER CRETACEOUS AND MIDDLE 52e Churchill River Gp. and marble breccia Issued 1991. 21a Preissac swarm: diabase dikes groups. JURASSIC 52f Bad Cache Rapids Gp. h 21b Marathon swarm: diabase dikes SOUTHERN AND SUPERIOR h This part of the legend describes Proterozoic units of the Information from this publication may be quoted if credit is Kaolinitic clay, clay, sand, lignite: 21 c Kenora-Fort Frances swarm: MIDDLE ORDOVICIAN Southern Province, and those Proterozoic units within given. It is recommended that reference to this map be 60a Mattagami Fm.; Mistuskwia Beds PROVINCES diabase dikes made in the following form: Limestone, dolostone, shale, arkose, the Superior Province. Most diabase dike and alkalic 60b Evans Strait Fm. EARLY PALEOZOIC TO 21 d Nipissing sills (2219 Ma): diabase sandstone intrusive rock map units listed for the Grenville Province Ontario Geological Survey 1991. Bedrock geology of sills, dikes and related granophyre JURASSIC NEOPROTEROZOIC (0.45 to 0.9 Ga) cut Grenville and Southern provinces; therefore, they Ontario, southern sheet; Ontario Geological Survey, 51a Ottawa Gp.; Simcoe Gp.; Shadow 21 e Mafic dikes and plutons of uncertain Carbonatite-alkalic intrusive suite are listed in the Southern Province part of the legend. Map2544,scale 1:1 000 000. Alkalic dikes and intrusions: kimberlite Lake Fm. age (450 to 600 Ma): carbonatite, nepheline i and lamprophyre 51b Chazy Gp., Rockcliffe Fm. A generalized distribution of diabase dikes is shown. syenite, alkalic syenite, ijolite, fenite; Felsic intrusive rocks (Murray Granite Some individual swarms occur in more than one LOWER ORDOVICIAN associated mafic and ultramafic intrusions 2388 Ma, Creighton Granite 2333 Ma): PALEOZOIC 35a Intrusions of uncertain age geological province. c granite MISSISSIPPI AN TO DEVONIAN Dolostone, sandstone: Beekmantown Gp. j This unit has a geographic distribution from the west Mafic intrusive rocksi HURONIAN SUPERGROUP shore of Lake Nipigon to the north shore of Lake Huron, Shale: Port Lambton Gp. (2.2Gato 2450 Ma) 34a Grenville swarm (-575 Ma): diabase including the Cutler, Chief Lake, Croker Island, English CAMBRIAN n dikes Cobalt Gp. : conglomerate, wacke, Bay and Manitoulin granites. DEVONIAN Conglomerate, sandstone, shale, 34b Frontenac swarm (850 to 900 Ma): arkose, quartz arenite, argillite dolostone: Potsdam Gp.; Nepean Fm., k This unit includes the Killarney and related granitoids UPPER DEVONIAN diabase dikes Quirke Lake Gp.; Hough Lake Gp.; Covey Hill Fm. and equivalent metavolcanic units, as well as the 34c Gabbro, diorite, ultramafic rocks, Elliot Lake Gp. Shale Killarney area granitoids. 57a Kettle Point Fm. granophyre 18a Conglomerate, wacke, arkose, quartz d l This unit includes the Chelmsford, Onwatin and 57b Long Rapids Fm. PRECAMBRIAN PROTEROZOIC arenite, argillite, limestone, dolostone Onaping formations. GRENVILLE PROVINCEe 18b Volcanic rocks of the Elliot Lake Gp. MIDDLE DEVONIAN MESOPROTEROZOIC (0.9 to 1.6 Ga) m INTRUSIVE ROCKS This unit includes the Gunflint and Rove formations. Limestone, dolostone, shale PROTEROZOIC UPPER KEWEENAWAN SUPERGROUP n This unit includes the Gowganda, Lorrain, Gordon Lake 56a Hamilton Gp. (<1086 Ma) Mafic and ultramafic intrusive rocks NEO- TO MESOPROTEROZOIC and Bar River formations. 56b Marcellus Fm. Jacobsville Gp.; Oronto Gp.: 17a Matachewan and Hearst swarms (0.57 to 1.6 Ga) i º sandstone, shale, conglomerate (2454 Ma): diabase dikes This unit was formerly classified as Algoman and/or 56c Dundee Fm. Tectonite unit: tectonites, straight 56d Detroit River Gp.; Onondaga Fm. 17b Gabbro, anorthosite Laurentian.Units 13, Hand 15aremainlyNeoarchean gneisses, porphyroclastic gneisses, INTRUSIVE ROCKS except in areas of the Sachigo Subprovince, where 56e Williams Island Fm. unsubdivided gneisses in major Carbonatite-alkalic intrusive suite SUPERIOR PROVINCE some examples of Mesoarchean age occur. 56f Murray Island Fm. deformation zones, mylonites, (1.0 to 1.2 Ga): carbonatite, nepheline 56g Moose River Fm. protomylonites syenite, alkalic syenite, ijolite, fenite; ARCHEAN p The intrusive rocks of Archean age range from 56h Kwataboahegan Fm. CENTRAL METASEDIMENTARY BELT associated mafic and ultramafic rocks NEOARCHEAN (2.5 to 2.9 Ga) approximately2.65 Ga to 3.2 Ga. q LOWER DEVONIAN Late felsic plutonic rocksf: Mafic and related intrusive rocks INTRUSIVE ROCKS This unit was formerly classified as Haileyburian. i (Keweenawan age) go r Sandstone, dolostone, limestone granodiorite, granite, syenite, pegmatite, Diorite-nepheline syenite suite : This unit was formerly classified as Timiskaming. This alkalic granite, migmatitic gneisses SYMBOLS 55a Bois Blanc Fm.; Oriskany Fm. 31 a Logan and Nipigon sills (1109 Ma): pyroxenite, diorite, monzonite, syenite, unit comprises fluvial to marine metasedimentary rocks 55b Stooping River Fm. Mafic to ultramafic plutonic rocksf: diabase sills nepheline syenite (saturated to with minor, commonly alkalic, metavolcanic rocks which undersaturated suite) locally unconformably overlie units 1 to 6. They have Geological boundary 55c Sextant Fm. diorite, gabbro, peridotite, pyroxenite, 31b Pigeon River and Pukaskwa anorthosite, derived metamorphic rocks swarms: diabase dikes generally only undergone the late deformation common Fault (traceable on surface, NEO- TO MESOARCHEAN in greenstone belts. SILURIAN 31 c Ultramafic, gabbroic and granophyric egop traceable in subsurface) Alkalic plutonic rocks: nepheline (2.5 to 3.4 Ga) UPPER SILURIAN syenite, alkalic syenite, fenite; associated intrusions s These units are shown only in the English River and INTRUSIVE ROCKS Iron formation Limestone, dolostone, shale, mafic, ultramafic and carbonatitic rocks 31 d Felsic to intermediate intrusive rocks Ouetico subprovinces. 31 e Abitibi swarm (1141 Ma): diabase Massive granodiorite to granite: sandstone, gypsum, salt t Granulite facies Early felsic plutonic rocksf: This unit was formerly classified as Keewatin. Most of dikes massive to foliated granodiorite to granite 54a Bass Islands Fm. granodiorite, tonalite, monzogranite, these sequences range in age from 2.7 Ga to 2.8 Ga Mafic intrusive rocksi 15a Potassium feldspar megacrystic units International boundary 54b Bertie Fm. syenogranite; derived gneisses and based on U/Pb zircon ages. 30a Mackenzie swarm (1267 Ma): 54c Salina Fm. migmatites Diorite-monzonite-granodiorite suite: u These units are large enough to show at the map scale Interprovincial boundary 54d Kenogami River Fm. (Upper Silurian diabase dikes diorite, tonalite, monzonite, granodiorite, GRENVILLE SUPERGROUP AND only within the Abitibi Subprovince, forming the Blake to Lower Devonian) 30b Sudbury swarm (1238 Ma): diabase syenite and hypabyssal equivalents District, County boundary g River Group and units south of Lake Abitibi. FLINTON GROUP dikes (saturated to oversaturated suite) MIDDLE AND LOWER SILURIAN v Geographic township boundary Carbonate metasedimentary rocks: Muscovite-bearing granitic rocks: The units under this heading include those greenstone (surveyed, unsurveyed) MIDDLE AND LOWER KEWEENAWAN Sandstone, shale, dolostone, siltstone marble, calc-silicate rocks, skarn, tectonic muscovite-biotite and cordierite-biotite belts which are older than 2.9 Ga based on U/Pb zircon breccias SUPERGROUP (1086 to 1107 Ma) 53a Guelph Fm. granite, granodiorite-tonalite chronology. All other Archean greenstones have been Railway Osier Gp.; Mamainse Point Fm., 53b Lockport Fm. Clastic metasedimentary rocksf: placed in the Neo- to Mesoarchean subdivision of the Multilane highway 53c Amabel Fm. Michipicoten Island Fm. Foliated tonalite suite: tonalite to legend. Index to Geology of Ontario Maps conglomerate, wacke, quartz arenite, granodiorite—foliated to massive 53d Clinton Gp.; Cataract Gp. arkose, limestone, siltstone, chert, minor 29a Basalt and associated conglomerate King's highway w 53e Thornloe Fm.; Earlton Fm. iron formation, minor metavolcanic rocks and arkose Gneissic tonalite suite: tonalite to This unit comprises those greenstone sequences in which shallow-water supermature sediments (quartz Secondary highway 53f WabiGp. 29b Rhyolite, quartz feldspar porphyry; granodiorite—foliated to gneissic—with Mafic to felsic metavolcanic rocks: arenites, shallow-water carbonates) have been 53g Attawapiskat Fm. associated conglomerate and arkose minor supracrustal inclusions Elevation (land, water) flows, tuffs, breccias, minor iron formation, identified. This type of unit unconformably overlies older The positions of all boundaries and surveyed lines are 53h Ekwan River Fm. minor metasedimentary rocks; includes Sibley Gp.: conglomerate, sandstone, Mafic and ultramafic rocksq: gabbro, granitoid rocks in the Steeprock Lake area, and older approximate. 53i Severn River Fm. reworked pyroclastic units, amphibolite shale anorthosite, ultramafic rocks greenstones in the North Caribou Lake area.