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Regional Geology, Sioux Lookout Orogenic Belt Ontario Geological Survey Open File Report 6017 Regional Geology of the Sioux Lookout Orogenic Belt, Western Wabigoon Subprovince: Stages of Archean Volcanism, Sedimentation, Tectonism and Mineralization 2000 ONTARIO GEOLOGICAL SURVEY Open File Report 6017 Regional Geology of the Sioux Lookout Orogenic Belt, Western Wabigoon Subprovince: Stages of Archean Volcanism, Sedimentation, Tectonism and Mineralization by J.R. Devaney 2000 Parts of this publication may be quoted if credit is given. It is recommended that reference to this publication be made in the following form: Devaney, J.R. 2000. Regional geology of the Sioux Lookout orogenic belt, western Wabigoon Subprovince: stages of Archean volcanism, sedimentation, tectonism and mineralization; Ontario Geological Survey, Open File Report 6017, 151p. e Queen’s Printer for Ontario, 2000 e Queen’s Printer for Ontario, 2000. 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Bag 3060, Hwy. 101 East, South Porcupine P0N 1H0 Toronto - MMIC, Macdonald Block, Room M2-17, 900 Bay St., Toronto M7A 1C3 This report has not received a technical edit. Discrepancies may occur for which the Ontario Ministry of Northern Devel- opment and Mines does not assume any liability. Source referencesare included in the report and users are urged to verify critical information. Recommendations and statements of opinions expressed are those of the author or authors and are not to be construed as statements of government policy. If you wish to reproduce any of the text, tables or illustrations in this report, please write for permission to the Team Leader, Publication Services, Ministry of Northern Development and Mines, 933 Ramsey Lake Road, Level B4, Sudbury, Ontario P3E 6B5. Cette publication est disponible en anglais seulement. Parts of this report may be quoted if credit is given. It is recommended that reference be made in the following form: Devaney, J.R. 2000. Regional geology of the Sioux Lookout orogenic belt, western Wabigoon Subprovince: stages of Archean volcanism, sedimentation, tectonism and mineralization; Ontario Geological Survey, Open File Report 6017, 151p. iii Contents Abstract .................................................................................. xv Introduction ............................................................................... 1 Access ................................................................................ 1 Acknowledgments ...................................................................... 1 Previous Work ......................................................................... 1 Geology of Stratigraphic Units ................................................................ 3 Stratigraphic Overview ................................................................... 3 Northern Volcanic Belt ................................................................... 5 Lithofacies ......................................................................... 5 Geochemistry ................................................................... 6 Interpretation ....................................................................... 6 Top Indications .................................................................. 6 Patara Formation ....................................................................... 6 Introduction, Definition and Age....................................................... 6 Lithofacies ......................................................................... 7 Conglomeratic Facies ............................................................. 7 Sandier Facies .................................................................. 8 Mudstone Facies ................................................................. 8 Interpretation ....................................................................... 8 Big Vermilion–Daredevil Unit ............................................................. 10 Introduction, Definition and Distribution................................................. 10 Lithofacies ......................................................................... 10 Western Exposures ............................................................... 11 Big Vermilion Lake Area.......................................................... 11 Big Vermilion Lake Area Alteration and Mineralization................................. 11 Highway 664 Area ............................................................... 12 Frog Rapids Area ................................................................ 12 Pelican Lake Area ............................................................... 12 Central Abram Lake Area......................................................... 13 Northeast Abram Lake Area....................................................... 13 Stratigraphic Conclusion .............................................................. 13 Stratigraphic Patterns, Potential Correlations, and Faulting................................... 14 Ament Bay Formation ................................................................... 14 Lithofacies ......................................................................... 14 Interpretation ....................................................................... 15 Basal Conglomerate Outcrop....................................................... 16 Stratigraphic Revision: Invalidation of the Term “Abram Group”............................. 16 Northeast Conglomerate Unit.......................................................... 16 Daredevil Formation ..................................................................... 16 Lithofacies ......................................................................... 17 Little Vermilion Formation ................................................................ 17 Rejection of the Term “Little Vermilion Formation”........................................ 17 Central Volcanic Belt: Northwest (Lower) Basaltic Part......................................... 17 Superior Junction .................................................................... 18 Abram Lake ........................................................................ 18 Little Vermilion Lake ................................................................ 18 Highway 72 Roadside Outcrops........................................................ 18 Miles Lake ......................................................................... 19 Lateral Lake ........................................................................ 19 v Southwest Echo Township ............................................................ 19 Central Volcanic Belt: Northeast Bay of Minnitaki Lake Area.................................... 19 Eastern Predominantly Basaltic Units.................................................... 20 Western Predominantly Andesitic Pyroclastic Units........................................ 20 Stratification .................................................................... 20 Primary Fragmental Fabrics........................................................ 20 Clast Composition ............................................................... 21 Clast Shape ..................................................................... 21 Clast Size ...................................................................... 21 Grading ........................................................................ 21 Sedimentary Structures........................................................... 22 Lava Flow Breccia Facies: Subaerial Deposits......................................... 23 Dikes .......................................................................... 23 Alteration Fabric ................................................................ 24 Sedimentary Facies: Subaerial (Fluvial) Reworking..................................... 24 Sedimentary Facies: Subaqueous
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