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Fracturing and Its Effects on Molybdenum Mineralization at Questa, New Mexico

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Fracturing and Its Effects on Molybdenum Mineralization at Questa, New Mexico Fracturing and its effects on molybdenum mineralization at Questa, New Mexico Item Type text; Dissertation-Reproduction (electronic) Authors Rehrig, William Allen, 1936- 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 08:48:40 Link to Item http://hdl.handle.net/10150/565196 FRACTURING AND ITS EFFECTS ON MOLYBDENUM MINERALIZATION AT QUESTA, NEW MEXICO by William Allen Rehrig A Dissertation Submitted to the Faculty of the DEPARTMENT OF GEOLOGY In Partial Fulfillment of the Requirements For the Degree of DOCTOR OF PHILOSOPHY In the Graduate College THE UNIVERSITY OF ARIZONA 1 9 6 9 THE UNIVERSITY OF ARIZONA GRADUATE COLLEGE I hereby recommend that this dissertation prepared under my direction by William Allen R e h r i g _____________________ entitled FRACTURING AND ITS EFFECTS ON MOLYBDENUM MINERALIZATION AT QUESTAj NEW MEXICO________________________________ _ be accepted as fulfilling the dissertation requirement of the degree of Doctor of P h i l o s o p h y _____________________ Dissertation D irector^ Date After inspection of the final copy of the dissertation, the following members of the Final Examination Committee concur in its approval and recommend its acceptance:* 9 / y x f t i t , 0! This approval and acceptance is contingent on the candidate's adequate performance and defense of this dissertation at the final oral examination. The inclusion of this sheet bound into the library copy of the dissertation is evidence of satisfactory performance at the final examination. PLEASE NOTE: Several pages contain colored illustrations. Filmed in the best possible way. UNIVERSITY MICROFILMS 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 bor­ rowers 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 re­ production 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 judgment the proposed use of the material is in the in­ terests of scholarship. In all other instances, however, permission must be obtained from the author. SIGNED: ACKNOWLEDGMENTS Special appreciation is due the staff cf the Department of Geology, The University of Arizona, for their assistance and sugges­ tions during the course of study. Dr. Spencer R. Tit ley visited the writer in the field and provided invaluable help in reading the manu­ sc rip t. Dr. Robert Carpenter, consulting geologist and professor at the Colorado School of Mines, directed the initial six months of field work. His knowledge and experience in the area proved most helpful throughout the course of the project. Helpful conversations were held with M essrs. John Schilling, Fred Graybeal, Donald Bryant, Charles Robinson, and Barry McMahon concerning various aspects of the work. Permission to publish this work was granted by the Molybdenum Corporation of America. The operational staff at the Questa mine, es­ pecially the Department of Geology, is thanked for aid in drafting, repro­ duction, access, transportation, and for geologic information. Financial assistance for the use of the computer during the study was made available from funds provided The University of Arizona by the American Metals Climax Corporation. In addition, the Department of Geology, The University of Arizona, provided funds for student help and computer time. Mr. Richard Call, engineering geologist, helped solve initial problems related to the computer processing of field data. Finally, thanks are extended to Dr. Paul Damon of the Labora­ tory of Isotope Geochemistry at The University of Arizona for permission ill to quote data on radiogenic dates from three samples collected in the area of interest. The New Mexico Bureau of Mines supplied the cost of one additional potassium-argon date. In addition to the sources of technical and scientific aid credited above, the writer wishes to acknowledge his wife, without whose help and patience the dissertation would not have been easily ended. Her many hours of work in figure preparation greatly hastened the termination date of the project. TABLE OF CONTENTS Page LIST OF ILLUSTRATIONS............................................................................... vii LIST OF TABLES.......................................................................... x ii ABSTRACT......................................... x iii INTRODUCTION.................................................................................................. 1 Purpose of the Study . L o c a tio n ............................ H is to ry ................................. H-* CO CO General Method of Study GENERAL G E O L O G Y ......................................................................................... 6 Sangre do Cristo M ountains ................................................................. 6 Red R iver-C abresto C reek A rea............................................................. 10 General Geology ............................................................................... 10 S tr u c tu r e ............................................................................................. 12 MINE GEOLOGY.................................................................................................. 15 Rock T y p e s .................................................................................................. 15 A ltera tio n ....................................................................................................... 18 Age R e la tio n s h ip s .................................................................................... 18 Fracturing and Faulting ................................................................. .... 21 Stockwork A s p e c ts ........................................................................... 21 F a u l t s .................................................................................................. 24 "Total" Fractures (Statistical Analysis)................................. 26 Summary S ta te m en t........................................................................... 46 M ineralization ............................................................................... .... 49 G eneral C h a r a c te r ........................................................................... 49 M ajor V e in s......................................................................................... 50 "Total" M ineralized S tr u c tu r e ................................................... 52 The Effects of More Recent D a t a ............................................... 59 Structure Analysis in Areas of Different Molybdenum Grade ................................................................. 60 Ore C o n t r o l s .................................................................................... 62 Summary S ta te m en t........................................................................... 67 v vi TABLE OF CONTENTS--(Continued) Page GENESIS OF FRACTURE FORMATION ............................................................. 69 Fracturing in the Mine A p l i t e ................................................................. 69 Fracture E le m e n ts ............................................................................... 69 Interrelation of Fracture E lem ents .............................................. 86 Relation of Fracture Elements to Mineralization and A lteration ............................................. 102 Sequence of Development of Fracture Elements...................... 103 Summary S ta te m en t.............................................................................. 109 Regional F a c to rs ............................................................................................ I l l The Red River Structural Z o n e ....................................................... I l l The N ortheast Structural Z o n e ....................................................... 113 Precam brian B a s e m e n t ..................................................................... 117 Structure in O ther P lu to n s ................................................................ 121 Summary S ta te m en t.............................................................................. 131 The Origin and Mechanics of Fracture Form ation ........................... 133 Local Fracturing ............................................................. 134 Regional Fracturing ......................................................................... 143 SUMMATION OF D A T A ....................................................................................... 168 CONCLUSIONS ...................................................................................................... 176 REFERENCES 188 LIST OF ILLUSTRATIONS Figure Page 1. Location Map of Ouesta Mine A re a .......................................... 3 2. Tectonic Map ..................................... : .............................................
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