CAPISISIT LAKE AREA, ABITIBI-EAST COUNTY PROVINCE of QUEBEC, CANADA Department of Mines Honourable C
RG 048(A) CAPISISIT LAKE AREA, ABITIBI-EAST COUNTY PROVINCE OF QUEBEC, CANADA Department of Mines Honourable C. D. FRENCH, Minister A.-O. DUFRESNE, Deputy Minister GEOLOGICAL SURVEYS BRANCH I. W. JONES, Chief GEOLOGICAL REPORT 48 CAPISISIT LARE AREA ABITIBI-EAST COUNTY by J.-E. Gilbert QUEBEC RÉDEMPTI PARADIS PRINTER TO HIS MAJESTY THE KING 1951- TABLE OF CONTENTS Page "INTRODUCTION 1 Location and general statement 1 Means of access and conditions of travel 1 Field-work and acknowledgments 3 Previous work and related publications 4 Description of the area 4 Tôpography 4 Drainage 5 Timber, fish, and game 6 GENERAL GEOLOGY 8 General statement 8 Table of formations 9 Volcanic series 10 General statement 10 Southern belt of volcanic rocks 11 Petrography 12 Rounded inclusions in lava flows 14 Northern belt of volcanic rocks 15 Sedimentary series 16 Basic intrusives 18 Acidic intrusives 21 Gneissic biotite-quartz diorite 21 Diorite-syenite complex 24 Gabbroic facies 25 Dioritic facies 26 Syenitic facies 27 Origin of the diorite-syenite complex 29 Capisisit Lake granite 31 Waswanipi granite 32 Dyke rocks 34 Olivine diabase dyke (Keweenawan7) 35 Cenozoic deposits 35 STRUCTURAL GEOLOGY 36 Folding 36 ..Shearing and faulting 40 Jointing '42 ECONOMIC GEOLOGY 43 General statement 43 Mineralized exposures 44 Recommendations 45 Recent developments 46 Page BIBLIOGRAPHY «..... 47 MAPS AND ILLUSTRATIONS Maps Map No. 849 — Capisisit Lake area, Abitibi East county. (in pocket) Figure 1 — Map showing distribution of areas covered with trees of economic size 7 Plâtes (At the centre of volume) I.— Maicasagi river near the western boundary of the Capisisit Lake area.