Geology of Foleyet and Ivanhoe Townships; Ontario Geological Survey, Open File Report 5851, 42P
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[email protected] 5691 (inside Canada, United States) Crown Copyright Queen’s Printer Local: (416) 326-2678 Toll Free: 1-800-668-9938 [email protected] (inside Canada, United States) Ministry of Northern Development and Mines Ontario Ontario Geological Survey Open File Report 5851 Geology of Foleyet and Ivanhoe Townships 1993 Ministry of Northern Development and Mines Ontario ONTARIO GEOLOGICAL SURVEY Open File Report 5851 Geology of Foleyet and Ivanhoe Townships By J.A. Ayer 1993 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: Ayer, J.A. 1993. Geology of Foleyet and Ivanhoe townships; Ontario Geological Survey, Open File Report 5851, 42p. © Queen's Printer for Ontario, 1993 3^OOTARIO Th's publication was funded under the Minerals program of the Canada-Ontario Northern Ontario Development .JZ'f^r^rs^-. Agreement (NODA), a four year joint initiative signed November 4, 1991. Ontario Geological Survey OPEN FILE REPORT Open File Reports are made available to the public subject to the following conditions: This report is unedited. Discrepancies may occur for which the Ontario Geological Survey does not assume liability. Recommendations and statements of opinions expressed are those of the author or authors and are not to be construed as statements of government policy. This Open File Report is available for viewing at the following locations: Mines Library Level A3, 933 Ramsey Lake Road Sudbury, Ontario P3E 6B5 Mines and Minerals Information Centre (MMIC) Rm. M2-17, Macdonald Block 900 Bay St. Toronto, Ontario M7A 1C3 The office of the Resident Geologist whose district includes the area covered by this report. Copies of this report may be obtained at the user's expense from: OGS On-Demand Publications Level B4, 933 Ramsey Lake Road Sudbury, Ontario P3E 6B5 Tel. (705)670-5691 Collect calls accepted. Handwritten notes and sketches may be made from this report. Check with MMIC, the Mines Library or the Resident Geologist's office whether there is a copy of this report that may be borrowed. A copy of this report is available for Inter-Library loan. This report is available for viewing at the following Resident Geologists' offices: Timmins, 60 Wilson Ave., Timmins P4N 2S7 The right to reproduce this report is reserved by the Ontario Ministry of Northern Development and Mines. Permission for other reproductions must be obtained in writing from the Director, Ontario Geological Survey - Geoscience Branch. iii FOREWORD Detailed geological mapping of Foleyet and Ivanhoe townships was undertaken by the Ontario Geological Survey, as part of the Canada - Ontario 1991 Northern Ontario Development Agreement (NODA), a subsidiary agreement to the Economic and Regional Development Agreement (ERDA) signed by the governments of Canada and Ontario. These two townships were mapped in detail to update the geological data base in a high mineral potential area In the light of new geological concepts several new areas of high base metal mineral potential and a new stratigraphic succession were outlined in the map area. B.O. Dressier AVDirector Geoscience Branch Ontario Geological Survey v CONTENTS Page ABSTRACT • xi INTRODUCTION 1 Location and Access 1 Mineral Exploration 1 Present- Geological Survey 2 Previous Geological Work 2 Physiography 3 Acknowledgments 4 GENERAL GEOLOGY 4 Archean 5 Ultramafic Metavolcanic Rocks 5 Mafic Metavolcanic Rocks 6 Intermediate Metavolcanic Rocks 9 Felsic Metavolcanic Rocks 9 Clastic and Chemical Metasedimentary Rocks . 10 Metamorphosed Ultramafic to Mafic Intrusions 11 Foliated Felsic to Intermediate Intrusive Rocks 13 Felsic to Intermediate Intrusive Rocks 15 Alkalic Mafic Intrusive Rocks 16 Proterozoic 17 Mafic Intrusive Rocks 17 Phanerozoic 17 Pleistocene and Recent 17 Metamorphism 18 Alteration 19 Correlation of Geology with Geophysical Data 21 STRUCTURAL GEOLOGY 2 2 Kapuskasing Structural Zone 2 2 North Swayze Structural Zone 23 ECONOMIC GEOLOGY 25 Description of Mineral Occurrences and Past Exploration 25 Bruneau, C. [1977] 26 Dubeau, R. [1980] 26 Hudbay Mining Limited [1983] 26 International Nickel Company of Canada Ltd. [1966] 28 Keevil Mining Group Limited [1965] 28 Noranda Exploration Company Limited [ 1972] 29 Guidelines For Mineral Exploration 30 Base Metals 30 Gold 31 REFERENCES 32 Conversion Table 42 vii LIST OF FIGURES Page 1. Key Map showing location of the Foleyet and Ivanhoe townships area xv 2. Generalized geology map of the Foleyet and Ivanhoe townships area. 34 3. Steronet plot of the poles to gneissosity from the Kapuskasing Structural Zone. 35 4. Steronet plot of structures from the Horwood assemblage. ..35 LIST OF PHOTOGRAPHS 1. B laded spinifex textures in ultramafic volcanic flows 36 2. Moderate hydrothermal silicification of mafic flow breccia. 36 3. Intense hydrothermal silicification. 3 7 4. Patchy silicification of felsic volcanic rocks. 37 5. Massive sulphide inclusion in the Ivanhoe Lake stock. 38 LIST OF TABLES 1. Table of lithological units for Foleyet and Ivanhoe townships 39 2. Assay results, comments and UTM location coordinates for samples collected from Foleyet and Ivanhoe townships. 40 MAPS IN BACK POCKET 1. P.3198 Precambrian Geology,Foleyet Township 2. P.3199 Precambrian Geology,Ivanhoe Township ix ABSTRACT Foleyet and Ivanhoe townships are underlain by two major subdivisions of the Superior Province consisting of the Kasuskasing Structural Zone in fault contact with the Abitibi Subprovince. The Kapuskasing Structuaral Zone rocks consist of paragneiss and amphibolite intruded by anorthosite, gabbro and ultramafic rocks of the Shawmere anorthosite complex in turn intruded by tonalite and granodiorite gneiss All thes rocks have been metamorphosed to granulite fades rank and represent rocks metamorphosed to lower crustal conditions thrust easterly over the Abitibi Subprovince along the northeast-trending Ivanhoe Lake cataclastic zone. Tonalite gneiss associated with the Shawmere anorthosite complex has been age dated at 2765 Ma. East of the Ivanhoe Lake cataclastioc zone the Swayze greenstone belt of the Abitibi Subprovince consists of easterly-trending deformed supracrustal rocks metamorphosed to greenschist and amphibolite rank that have been intruded by granitoid rocks. The supracrustal rocks have been subdivided into two assemblages separated by the easterly-trending Muskego River fault North of the fault, the Muskego-Reeves assemblage consists of diverse volcanic rocks of mafic, ultramafic, felsic and intermediate compositions and sedimentary rocks consisting of conglomerate, wacke, siltstone,mudstone and ironstone. Minor synvolcanic intrusions range from pyroxenite to leucogabbro.