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Information to Users PALEOMAGNETISM OF JURASSIC VOLCANIC ROCKS IN SOUTHEASTERN ARIZONA AND NORTH AMERICAN JURASSIC APPARENT POLAR WANDER. Item Type text; Dissertation-Reproduction (electronic) Authors MAY, STEVEN ROBERT. Publisher The University of Arizona. Rights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. Download date 05/10/2021 16:53:24 Link to Item http://hdl.handle.net/10150/184199 INFORMATION TO USERS While the most advanced technology has been used to photograph and reproduce this manuscript, the quality of the reproduction is heavily dependent upon the quality of the material submitted. For example: G Manuscript pages may have indistinct print. In such cases, the best available copy has been filmed. (;) Manuscripts may not always be complete. In such cases, a note will indicate that it is not possible to obtain missing pages. o Copyrighted material may have been removed from the manuscript. In such cases, a note will indicate the deletion. Oversize materials (e.g., maps, drawings, and charts) are photographed by sectioning the original, beginning at the upper left-hand corner and continuing from left to right in equal sections with small overlaps. Each oversize page is also filmed as one exposure and is available, for an additional charge, as a standard 35mm slide or as a 17"x 23" black and white photographic print. Most photographs reproduce acceptably on positive microfilm or microfiche but lack the clarity on xerographic copies made from the microfilm. For an additional charge, 35mm slides of 6"x 9" black and white photographic prints are available for any photographs or illustrations that cannot be reproduced satisfactorily by xerography. Order Number 8727781 Paleomagnetism of .Jurassic volcanic rocks in southeastern Arizona an.d North American Jurassic apparent polar wander May, Steven Robert, Ph.D. The University of Arizona, 1985 U·M·! 300 N. Zeeb Rd. Ann Arbor, MI 48106 PLEASE (\JOTE: In all cases this material has been filmed in the best possible way from the available copy. Problems encounteied with this document have been identified here with a check mark---=L-. 1. Glossy photographs or pages_"__ 2. Colored illustrations, paper or print 3. Photographs with dark background _ 4. Illustrations are poor copy 5. Pages with black marks, not original copy 6. Print shows through as there is t~xt on both sides of page 7. Indistinct, broken or small print on several pages tI 8. Print exceeds margin requirements 9. Tightly bound copy with print lost in spine 10. Computer printout pages with indistinct print 11. Page(s) lacki~g when material received, and not available from school or author. 12. Page(s) seem to be missing in numbering only as text follows. 13. Two pages numbered . Text follows. 14. Curling and wrinkled pages __ 15. Dissertation contains pages with print at a slant, filmed as received ____ 16. Other_______________________________________________________ __ University Microfilms International PALEOMAGNE~ISM OF JURASSIC VOLCANIC ROCKS IN SOUTHEASTERN ARIZONA AND NORTH AMERICAN JURASSIC APPARENT POLAR WANDER by Steven Robert May A Dissertation Submitted to the Faculty of the DEPARTMENT OF GEOSCIENCES In Partial Fulfillment of the Requirements For the Degree of DOCTOR OF PHILOSOPHY In the Graduate College THE UNIVERSITY OF ARIZONA 1 9 8 5 THE UNIVERSITY OF ARIZONA GRADUATE COLLEGE As members of the Final Examination Committee, we certify that we have read the dissertation prepared by ~S~t~e~v~e~n~R~o~b~e~r~t~M~a~y____________________________ __ entitled Paleomagnetism of Jurassic volcanic rocks in southeastern Arizona and North American Jurassic apparent polar wander and recamnend that it be accepted as fulfilling the dissertation requirement for the Degree of Doctor of Philosophy Date /lrAQ, Z 7 J ;785"-- Date T\...,,,,,,0... ~~ 'y '\ 8 ~ Date '\ C Final approval and acceptance of this dissertation is contingent upon the candidate's submission of the final copy of the dissertation to the Graduate College. 1 hereby certify that I have read this dissertation prepared under my direction and recommend that it be accepted as fulfilling the dissertation requirement. (2 ~ QJ2k.. Dissertation Director Date STATEMENT BY AUTHOR This dissertation has been submitted in partial fulfillment of requirements for an advanced degree at The University of Arizona and is deposited in the University Library to be made available to borrowers under rules of the Library. Brief quotations from this dissertation are allowable without special permission, provided that accurate acknowledgment of source is made. Requests for permission for extended quotation from or reproduction of this manuscript in whole or in part may be granted by the head of the major department or the Dean of the Graduate College when in his or her judgment the proposed use of the material is in the interests of scholarship. In all other instances, however, permission must be obtained from the author. ACKNOWLDEGEMENTS It is a sincere pleasure to acknowledge the help and support of Bob Butler throughout all phases of my dissertation research. Bob, Pat, Jake, and Topper Butler also provided numerous hours of much enjoyed extracurricular companionship. This dissertation has benefited from reviews by my committee, Bob Butler, Myrl Beck, Bill Dickinson, Peter Coney, and Paul Damon. For their contributione of time and thought, I am grateful. Bob Butler, Pat Butler, Gary Calderone, Paul Ryberg, Laurel Vedder, and Steve Wust provided much appreciated help in the field. The computer program used for paleomagnetic Euler pole analysis was provided by Greg Cole along with very patient coaching. Muhammad Shafiqullah was instrumental to the successful completion and interpretation of Rb/Sr isotope analysis. Dave Steinke came to my aid during numerous instances of real or imagined laboratory calamity. A number of students in the Department of Geosciences provided moral support and were usually willing to listen to the theory of the day. Most courageous among these were Charlie lolinker, Rich Armin, Steve Wuat, Tekla Harms, Margaret Klute, and Laurel Vedder. Finally I would like to thank my parents, Kay and Bob May, for providing unwavering support throughout my dissertation study. Without them, this would not have been possible. Funding for this research was provided by National Science Foundation Grant EAR-83l4ll3. iii TABLE OF CONTENTS Page LIST OF ILLUSTRATIONS ....................................... vii LIST OF TABLES .............................................. xi ABSTRACT •••••••••••••••••••••••••••••••••••••••••• eo. • • • • • •• xi i 1. PALEOMAGNETISM OF JURASSIC VOLCANIC ROCKS IN THE PATAGONIA MOUNTAINS, SOUTHEASTERN ARIZONA: IMPLICATIONS FOR THE NORTH AMERICAN 170 MA REFERENCE POLE •••••••••••••••••••••••••••••• 1 Regional Geology....................................... 3 Rocks of Corral Canyon •••••••••••••• 8.................. 9 Stratigraphy •••••••••••••••••••••••••••••••••••••• 11 Rb/Sr Geochronology •••••••••••••••••••••••••••••••••••• 18 Paleomagnetic Techniquues •••••••••••••••••••••••••••••• 21 Analysis of Demagnetization Experiments •••••••••••••••• 23 Paleomagnetic Results •••••••••••••••••••••••••••••••••• 29 Colina Limestone •••••••••••••••••••••••••••••••••• 36 Paleomagnetic Pole Position •••••••••••••••••••••••••••• 37 Implications for the Age of the McCoy Mountains Formation ••••••••••••••••••••••••••••••••••••••••• 44 Summary •••••••••••••••••••••••••••••••••••••••••••••••• 57 2. PALEOMAGNETISM OF THE JURASSIC CANELO HILLS VOLCANICS, SOUTH- EASTERN ARIZONA •••••••••••••••••••••••••••••••••••••••••••••• 59 Stratigraphy and Regional Geology •••••••••••••••••••••• 62 Rhyolite Flow Member .............................. 63 Welded Tuff Member •••••••••••••••••••••••••••••••• 67 Structure •••••••••••••••••••••••••••••••• 0 •••••••• 69 Paleomagnetic Sampling •••••••••••••••••••••••••••• 73 Parker Canyon Section - Sampling ••••••••••••• 75 Collins Canyon Section - Sampling •••••••••••• 76 Canelo Pass Section - Sampling ••••••••••••••• 77 Paleomagnetic Techniques ••••••••••••••••••••••••••••••• 77 Analysis of Demagnetization Experiments •••••••••••••••• 77 Paleomagnetic Results •••••••••••••••••••••••••••••••••• 86 Parker Canyon Section - Results ••••••••••••••••••• 93 Collins Canyon Section - Results •••••••••••• & ••••• 97 Canelo Pass Section ~ Results ••••••••••••••••••••• 98 Discussion.••••••••••••••••••••••••••••••••••••••••••••• 99 iv v TABLE OF CONTENTS--continued Page Implications for Jurassic Volcanology in Southeastern Arizona •••••••• ~ ••••••••••••••••••••••••••••••••• 110 3. NORTH AMERICAN JURASSIC APPARENT POLAR WANDER: IMPLICATIONS FOR PLATE MOTION, PALEOGEOGRAPHY AND CORDILLERAN TECTONICS •••••• 113 Historical Development of the Jurassic APW Path ••••••• 116 Constructing APW Paths: Techniques and Critiques •••••• 122 Time Scales •••••••••••••••••••••••••••••••••••••• 127 Jurassic Paleomagnetic Poles •••••••••••••••••••••••••• 131 Late Jurassic: 143-163 Ma •••••••••••.• 0 ••••••••••• 131 Morrison Formation ••••••••••••••.•••••••••••• 131 Glance Conglomerate ••••••••••••••••••••••••• 136 Middle Jurassic: 163-188 Ma •••••••••••••••••••••• 138 Corral Canyon ••••••••••••••••••••••••••••••• 138 Newark Trend Intrusives ••••••••• ~ ••••••••••• 139 Other Poles •••••••••••••••••••••••••••••••••••••• 141 Summerville Formation
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