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Precambrian Geology, Northern Swayze Greenstone Belt Precambrian Geology Northern Swayze Greenstone Belt Ontario Geological Survey Report 297 1995 1 2 Precambrian Geology Northern Swayze Greenstone Belt Ontario Geological Survey Report 297 J. A. Ayer 1995 CANADA ONTARIO This publication was funded under the Minerals program of the EDNO • Northern Ontario Canada-Ontario Northern Ontario Development Agreement (NODA), Development Agreement Entente de développement du nord de l'Ontario a four year joint initiative signed November 4, 1991. NODA Minerals • Minéraux i © Queen’s Printer for Ontario, 1995 ISSN 0704-2582 ISBN 0-7778-3813-3 Publications of the Ontario Geological Survey and the Ministry of Northern Development and Mines are available from the following sources. Orders for publications should be accompanied by cheque or money order payable to the Minister of Finance. Reports, maps and price lists (personal shopping or mail order): Mines and Minerals Information Centre M2-17 Macdonald Block 900 Bay Street Toronto, Ontario M7A 1C3 Toll-free long distance, 1-800-665-4480 Reports, maps and price lists (personal shopping): Publication Sales Ministry of Northern Development and Mines Willet Green Miller Centre Level B2, 933 Ramsey Lake Road Sudbury, Ontario P3E 6B5 Telephone: (705) 670-5691 Fax: (705) 670-5770 E-mail: [email protected] Canadian Cataloguing in Publication Data Ayer, John Albert Precambrian geology, Northern Swayze Greenstone belt (Ontario Geological Survey report, ISSN 0704-2582; 297) Includes bibliographic references. ISBN 0-7778-3813-3 1. Geology-Ontario-Swayze Region. 2. Geology, Stratigraphic-Precambrian. 3. Greenstone belts-Ontario-Swayze Region. I. Ontario. Ministry of Northern Development and Mines. II. Ontario Geological Survey. III. Title. IV. Series. QE191.A93 1995 551.7’1’09713133 C95-964027-4 Every possible effort is made to ensure the accuracy of the information contained in this report, but the Ministry of Northern Development and Mines does not assume any liability for errors that may occur. Source references are included in the report and users may wish to verify critical information. If you wish to reproduce any of the text, tables or illustrations in this report, please write for permission to the Director, Ontario Geological Survey, Ministry of Northern Development and Mines, Willet Green Miller Centre, 933 Ramsey Lake Road, Sudbury, Ontario P3E 6B5. Cette publication est disponible en anglais seulement. Parts of this publication may be quoted if credit is given. It is recommended that reference be made in the following form: Ayer, J.A. 1995. Precambrian geology, northern Swayze greenstone belt; Ontario Geological Survey, Report 297, 57p. Critical Reader: P.C. Thurston Edited/Produced by: Geomatics International Inc. ii Contents Introduction .................................................................................................................. 3 Mineral Exploration................................................................................ 3 Previous Geological Work ...................................................................... 4 Present Geological Survey...................................................................... 4 Acknowledgments .................................................................................. 4 General Geology .......................................................................................................... 6 Archean ................................................................................................................ 7 Ultramafic Metavolcanic Rocks .................................................................... 7 Mafic Metavolcanic Rocks ............................................................................ 8 Intermediate Metavolcanic Rocks ................................................................ 9 Felsic Metavolcanic Rocks ............................................................................ 9 Clastic Metasedimentary Rocks .................................................................... 10 Chemical Metasedimentary Rocks ................................................................ 10 Metamorphosed Ultramafic Cumulate Rocks .............................................. 11 Metamorphosed Mafic Intrusive Rocks ........................................................ 12 Felsic to Mafic Plutonic Rocks...................................................................... 12 Kapuskasing Structural Zone ................................................................ 13 Nat River Granitoid Complex ................................................................ 13 Kenogamissi Batholith .......................................................................... 14 Tom Smith Lake Granitic Complex ...................................................... 14 Kukatush Pluton .................................................................................... 15 Hoodoo Lake Pluton .............................................................................. 15 Ivanhoe Lake Pluton .............................................................................. 16 Alkalic Mafic Intrusive Rocks ...................................................................... 16 Proterozoic ............................................................................................................ 16 Mafic Intrusive Rocks .................................................................................. 16 Phanerozoic .......................................................................................................... 17 Pleistocene and Recent .................................................................................. 17 Metamorphism ...................................................................................................... 17 Alteration .............................................................................................................. 18 Silicification .................................................................................................. 18 Chloritoid-bearing Volcanic Rocks .............................................................. 18 Carbonatization .............................................................................................. 18 Epidotization .................................................................................................. 18 Geochemistry................................................................................................................ 20 Structural Geology ...................................................................................................... 43 Kapuskasing Structural Zone ................................................................................ 43 North Swayze Greenstone Belt Zone .................................................................. 43 Folding .......................................................................................................... 43 Faulting .......................................................................................................... 44 Ductile Faults ........................................................................................ 45 Brittle-Ductile Faults .............................................................................. 45 Brittle Faults .......................................................................................... 45 Economic Geology ...................................................................................................... 46 Gold ...................................................................................................................... 46 Arkell ............................................................................................................ 46 BHP-Utah Mines Limited .............................................................................. 46 B.P. Resources Limited.................................................................................. 46 Bromley.......................................................................................................... 47 Card Lake Copper Mines Limited ................................................................ 47 Hoodoo-Patricia ............................................................................................ 47 Joburke Mine ................................................................................................ 47 iii Johnson Wright .............................................................................................. 48 Jonsmith ........................................................................................................ 48 Kalbrook ........................................................................................................ 49 Little Long Lac Gold Mines Limited ............................................................ 49 Mining Corp .................................................................................................. 49 Nib Yellowknife ............................................................................................ 49 Tremblay ........................................................................................................ 49 Unigold Resources Limited .......................................................................... 49 Copper and Zinc.................................................................................................... 50 Dome Exploration .......................................................................................... 50 Hudbay Mining Limited ...............................................................................
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