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Information to Users KINEMATIC SIGNIFICANCE OF MYLONITIC FOLIATION (METAMORPHIC). Item Type text; Dissertation-Reproduction (electronic) Authors NARUK, STEPHEN JOHN. 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 17:42:32 Link to Item http://hdl.handle.net/10150/184087 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: o Manuscript pages may have indistinct print. In such cases, the best available copy has been filmed. o Manuscripts may not always be complete. In such cases, a note will indicate that it is not possible to obtain rnissing 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 posHive 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. 8712901 Na ruk, Stephen John KINEMATIC SIGNIFICANCE OF MYLONITIC FOLIATION The University of Arizona PH.D. 1987 University Microfilms International 300 N. Zeeb Road, Ann Arbor, MI48106 Copyright 1987 by Naruk, Stephen John All Rights Reserved PLEASE NOTE: In all cases this material has been filmed in the best possible way from the available copy. Problems encountered with this document have been identified here with a check mark_../_. 1. Glossy photographs or pages ~ 2. Colored illustrations, paper or print L 3. Photographs with dark background ~ 4. Illustrations are poor copy ___ 5. Pages with blacl( 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 /' 8. Print exceeds margin requirements __ 9. Tightly bound copy with print lost in spine ___ 10. Computer printout pages with indistinct print ___ 11. Page(s) lacking 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 KINEMATIC SIGNIFICANCE OF MYLONITIC FOLIATION by Stephen John Naruk 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 198 7 Copyright 1987 by Stephen John Naruk THE UNIVERSITY OF ARIZONA GRADUATE COLLEGE As members of the Final Examination Committee, we certify that we have read the dissertation prepared by stephen J. Naruk entitled -----------------------------------------------------------------Kinematic Significance of Mylonitic Foliation and recommend that it be accepted as fulfilling tte dissertation requirement Doctor of Philosophy Date Date Date /J I es.... ~~:e \'\'tI ? Date IS-It!?!','! /182 Date I Final approval and acceptance of this dissertation is contingent upon the candidate's sUbr.lission of the final copy of the dissertation to the Graduate College. I hereb~ertify that I have read this dissertation prepared under my uirectlon and recommend that it be accepted as fulfilling the dissertation requi ementa~ 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 allow­ able without special permission, provided that accurate acknowledgment of source is made. Requests for permission for extended quotation from or reproduction of this manu­ script in whole or in part may be granted by the copyright holder. SIGNED:~ ii ACKNOWLEDGMENTS I am greatly indebted to my friends and mentors, George Davis, Clem Chase, Steve Reynolds, Bill Dickinson, Bob Butler, Arild Andresen, and Chuc]c Thorman for advice, encouragement, and thoughtful critcisms and reviews. Research support was provided by SOHIO Petroleum Company, the University of Tromso, the Geological Society of America, Sigma Xi, the U.S. Geological Survey, the University of Arizona Graduate College, Judge and Mrs. Henry J. Naruk, and Regina M. Capuano. iii TABLE OF CONTENTS Page LIST OF ILLUSTRATIONS .............................. vi LIST OF TABLES ......•.............................. viii ABSTRACT ....•••.••••••..•••••....•..••••.•••...•..• ix 1. INTRODUCT.. ION ...... 4. 0 ~ •••••••••••••••••••••••••••••• 1 Interpretations of Foliation Surfaces as Displacement Surfaces ....................... 3 Interpretations of Foliation Surfaces as Finite Flattening Surfaces .................. 3 Interpretations of Foliation Surfaces as Minimum Strain Surfaces ................•..•. 5 Tectonic Implications .................•......... 9 Summary of Problem and Methods .................. lO 2. BJORNFJELL ZONES ................................... 12 Introduction .................... ~ ............. .. 12 Geometric Analysis ...................... 0 ••••••• 14 Kinematic Analysis ........................ t •••••• 20 3. PINALENO MOUNTAINS METAMORPHIC-CORE-COMPLEX ZONE ... 23 Int roduct i on ....... fool •••••••••••••••••••••••••••• 23 Geornet ric Analys is .............................. 25 Kinematic Analysis .............................. 30 4. SANTA CATALINA METAMORPHIC-CORE-COMPLEX ZONE ....... 35 Introduction ................................................. 35 Geometric Analysis ....................................................... 37 Kinematic Analysis ....................................... 41 Northwestern Domain ......................... 41 Southern Domain ............................. 45 Central Domain ......................................... 49 Summary ...................................................... 51 iv v TABLE OF CONTENTS--Continued Page 5. STRAIN SIGNIFICANCE OF S-SURFACES .................. 53 6. DYNAMIC SIGNIFICANCE OF C-SURFACES ................. 56 7. SUMMARY ............•.....•............•.........•.. 63 8. LIST OF REFERENCES ................................. 66 LIST OF ILLUSTRATIONS Figure Page 1. Shear zone block diagrams ........................ 4 2. Geologic map of Bjornfjell mylonite zones ........ 13 3. Cross sections of Bjornfjell mylonite zones ...... 15 4. Photographs of mylonitic foliation and crenulation cleavage in Bjornfjell zones ......... 17 5. Lower hemisphere, equal area projections of Bjornfjell Zone data ..............•......•.•.• 19 6. Geologic map of Pinaleno Mountains metamorphic-core-complex mylonite zone ........... 24 7. Lower he~isphere, equal area projections of Pinaleno Zone dnta ............................ 26 8. Cross sections of Pinaleno Mountains mylonite zone .................................... 27 9. Photographs of shear bands in Pinaleno Mountains mylonitic granite and mylonitic gneiss ..............•............................ 29 10. Derivation of strain equation 3 ............. ,...•. 32 11. Geologic map of the Santa Catalina mylonite zone ..................................... 36 12. Lower hemisphere, equal area projections of Santa Catalina zone data ......................... 39 13. Lower hemisphere, equal area projections of poles to di]{es ................................... 42 14. Cross section of the Santa Catalina mylonite zone .................................... 46 vi vii LIST OF ILLUSTRATIONS--Continued Figure Page 15. Stress-strain curve and failure envelope for ideal elasticoviscous material ............... 59 16. Orientations of shear bands, X, and Z in simple shear and pure shear ...................... 60 LIST OF TABLES Table Page I. Calculated and observed values of 8' in Pinaleno zone ................. " ................ 31 f II. Calculated and observed values of 8 in Santa Catalina zone ...........•................ 44 viii ABSTRACT Geom~tric analyses of three mylonite zones, including two metamorphic-core-complex SC-mylonite zones, show that the mylonitic foliation surfaces (S-surfaces) are consistently discordant to the margins of the shear zones. Finite-strain analyses show that the foliation surfaces in each zone are consistently oriented parallel to the XY­ plane of the finite strain ellipsoid. The shear bands within the mylonites (C-surfaces, C'-surfaces, extensional crenulations, and shear-band cleavages) are uniformly oriented subparallel to the margins of the shear zones. The finite lengths and discontinuous natures of the shear bands require that the displacement along them be accomo­ dated by the S-surfaces
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