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Xerox University Microfilms 300 North Zeeb Road Ann Arbor, Michigan 48106 75-26,628 INFORMATION TO USERS This material was produced from a microfilm copy of the original document. While the most advanced technological means to photograph and reproduce this document have been used, the quality is heavily dependent upon the quality of the original submitted. The following explanation of techniques is provided to help you understand markings or patterns which may appear on this reproduction. 1. The sign or "target" for pages apparently lacking from the document photographed is "Missing Page(s)". If it was possible to obtain the missing page(s) or section, th ey are spliced into the film along with adjacent pages. This may have necessitated cutting thru an image and duplicating adjacent pages to insure you complete continuity. 2. When an image on th e film is obliterated with a large round black mark, it is an indication that the photographer suspected that the copy may have moved during exposure and thus cause a blurred image. You will find a good image of the page in the adjacent frame. 3. When a map, drawing or chart, etc., was part of the material being photographed the photographer followed a definite method in "sectioning" the material. It is customary to begin photoing at the upper left hand corner of a large sheet and to continue photoing from left to right in equal sections with a small overlap. If necessary, sectioning is continued again — beginning below the first row and continuing on until complete. 4. The majority of users indicate that the textual content is of greatest value, however, a som ewhat higher quality reproduction could be made from "photographs" if essential to the understanding of the dissertation. Silver prints of "photographs" may be ordered at additional charge by writing the Order Department, giving the catalog number, title, author and specific pages you wish reproduced. 5. PLEASE NOTE: Som e pages may have distinct print. Filmed as received. Xerox University Microfilms 300 North Zeeb Road Ann Arbor, Michigan 48106 75-26,628 MJKTAUGH, John Graham, 1934- GEOLOCy OF THE MANICOUAGAN CRYPTOEXPLOSION STRUCTURE. The Ohio State IMiversity, Ph.D., 1975 Geology Xerox University Microfiims,Ann Arbor, Michigan 481 oe THIS DISSERTATION HAS BEEN MICROFILMED EXACTLY AS RECEIVED. GEOLOGY OF THE MANICOUAGAN CRYPTOEXPLOSION STRUCTURE DISSERTATION Presented In Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy In the Graduate School of The Ohio State University John Graham Murtaugh, B.S., M.S. The Ohio State University 1975 Reading Committee: Approved by George E. Moore, Jr. Gunter Faure George E, Moore, Jr. Ernest E. Ehlers Department of Geology and M ineralogy Frontispiece — The Manicouagan Cryptoexplosion StT«-ture photographed frcn MSA's ERTS Satellite, Light grey is land, black is water, white is clouds. Diameter of structure to median of bounding lakes is 65 km. ACKNOÏOLEDGEMENTS This investigation was carried out under the auspices of The Geological Exploration Service of the Quebec Department of Natural Resources. The Service provided both the opportunity and funds for the investigation by employing me as a party chief for four field seasons, and providing thin sections, chemical analyses, and funds for miscellan­ eous expenses. Some laboratory work and writing was done while I held the Bownocker Fellowship of the Department of Geology at The Ohio State University. Several professors at the Department of Geology (now the Department of Geology and Mineralogy) of the Ohio State University were helpful during the investigation. Dr. G. E. Moore, Jr., ray adviser, visited me in the field, helped in the examination of numerous thin sections, and read interim reports and drafts over a period of several years. Drs. Gunter Faure and E. E. Ehlers helped in discussions of specific problems. M. R. Dencc, of the Dominion Observatory of Canada, deserves special thanks for Intercepting me on the way to my first field season in the Manicouagan Cryptoexplosion Structure and warning me of the strange and wondrous things I would soon behold. Without this warning my first field season would undoubtedly have been a catastrophe. K. L. Currie, of the Geological Survey of Canada, collaborated with me in producing a preliminary geologic map and report. Although we disagree on the interpretation of almost everything concerning the geology of this area, the free interchange of information between us helped this report Immeasurably. It is impossible to list all the field assistants who served during the course of four long field seasons. Particular thanks are due D. W. Roy, Jr., and Jean-Pierre Bassaget, who survived two field seasons as senior assistants, and who undertook independent investiga­ tions of part of the geology of the area. S. R. Wolfe worked with the party under the auspices of the U. S. Geological Survey, and in fact contributed the work of a senior assistant for the better part of a field season. December 12, 1934 . ............................ .... Bom - Mlneola, New York 1959 ............................................................................... B.S., University of Dayton, Dayton, Ohio 1962 , ............................ .........................................M.S., University of Idaho, Moscow, Idaho 1961-1963 ...................................................................... Instructor, Department of Geology, University of Dayton, Dayton, Ohio 1963-1968 ................ Teaching Assistant, Department of Geology, The Ohio State U niversity, Columbus, Ohio 1964-1967 ........................ .......................................... Party Chief, Geological (summers) Exploration Service, Depart­ ment of Natural Resources, Province of Quebec, Canada 1966 .................................................................................... Bownocker Fellow, Department of Geology, The Ohio State University, Columbus, Ohio 1968-1973 ...................................................................... Assistant Professor, Depart­ ment of Geology, University of Dayton, Dayton, Ohio 1973-1975 ...................................................................... Instructor, Department of Geosciences, State University of New York, College at Buffalo, Buffalo, New York PUBLICATIONS Murtaugh, J. G., 1965, Geology of Tetepisca Lake area: Quebec Dept. Natural Resources, Prelim. Kept. no. 536. Faure, G., Murtaugh, J. G., and Montigny, R. J. E., 1968, Geochronology of the basement complex of the Central Transantarctic Mountains: Canadian Jour. I^rth Sci., p. 555-560. Murtaugh, J. G. and Currie, K. L., 1969, Preliminary study of the Manicouagan Structure: Quebec Dept. Natural Resources, Prelim. Rept. no. 583. Murtaugh, J. G., 1969, Geology of the Wisconsin Range batholith, Transantarctic Mountains: New Zealand Jour. Geol. and Geophysics, V . 12, p . 526-550. Murtaugh, J. G., 1972, Shock metamorphism in the Manicouagan Crypto­ explosion Structure, Quebec: 24th International Geol. Congr. Rept., Sect. 15, p. 133-139. FIELDS OF STUDY Major Field: Geology and Mineralogy Studies In Mineralogy. Professors Ernest E. Ehlers and Henry Wenden Studies in Isotope Geology and Geochemistry. Professor Gunter Faure TAJJLIi OF CONTENTS FRONTISPIECE...................... l i ACKNOWLEDGEMENTS ............................................ ill VITA ..................................................................... V LIST OF T A Ü L E S ................................................................................................................ x l LIST OF ILLUSTRATIONS.................................................................................................. x l l INTRODUCTION GENERAL STATEMENT ........................................................................................................... 1 FIELD W O RK....................................................................................... 2 PREVIOUS WORK.................................................................................................................... 3 DESCRIPTION OF THE AREA............................................................................................. 5 Location and Access Settlement and Resources PHYSIOGRAPHY.................................................................................................................... 7 Terrain Outside the Structure Terrain Inside the Structure GLACML GEOLOGY ..................................... 12 GENERAL GEOLOGY SUMMARY OF AREAL GEOLOGY......................................................................................... 13 PART I : THIÎ PRECAHBRIAN AND PALEOZOIC COUNTRY ROCKS MANICOUAGAN UPLANDS METAGABBRO ...................................................................... Pyroxene Metagabbro Biotite-homblende Metagabbro Granulite Facies Rocks Intercalated with Metagabbro Metamorphism and Deformation Contact Relations O rig in and Age CHARNOCKITIC ROCKS L ith o lo g y Metamorphism and Deformation C o n ta ct R e la tio n s and Age O rig in AMPHIBOLITE-GRANULITE TRANSITIONAL FACIES ROCKS Tan Gneisses Melanocratic Gneisses Metamorphism and Deformation Contact Relations, Origin, and Age GREY GNEISS COMPLEX , Metamorphosed Mafic and Ultramafic Rocks Metamorphism and Deformation C o n ta ct R e la tio n s and Age O rig in GRANITIC GNEISS , C o n ta ct R e la tio n s and Age O rig in GAGNON GROUP (GRENVILLE SUPERGROUP ?) Description of Rock Units Brecciated Metaquartzite Miite Banded M etaquartzite Ferruginous Metaquartzite Iron Formation Well-banded Graphitic Paragneiss Muscovite-bearing Quartzofeldspathic Gneiss Metamorphism and Deformation
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