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Analysis of Gravity Data from the Cienega Creek Area, Pima and Santa Cruz Counties, Arizona

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Analysis of Gravity Data from the Cienega Creek Area, Pima and Santa Cruz Counties, Arizona Analysis of gravity data from the Cienega Creek area, Pima and Santa Cruz counties, Arizona Item Type text; Thesis-Reproduction (electronic) Authors Bittson, Andrew George, 1951- 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 06/10/2021 09:20:44 Link to Item http://hdl.handle.net/10150/566652 ANALYSIS OF GRAVITY DATA FROM THE CIENEGA CREEK AREA, PIMA AND SANTA CRUZ COUNTIES, ARIZONA by Andrew George Bittson A Thesis Submitted to the Faculty of the DEPARTMENT OF GEOSCIENCES In Partial Fulfillment of the Requirements For the Degree of MASTER OF SCIENCE In the Graduate College THE UNIVERSITY OF ARIZONA 1 9 7 6 STATEMENT BY AUTHOR This thesis has been submitted in partial fulfillment of re­ tirements 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 thesis 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 judg­ ment the proposed use of the material is in the interests of scholar­ ship. In all other instances, however, permission must be obtained from the author. SIGNED: APPROVAL BY THESIS DIRECTOR This thesis has been approved on the date shown below: -JOHN S. SUNTNER Date J ofessor of Geosciences ACKNOWLEDGMENTS I wish to express my sincerest thanks to Cities Service Miner­ als Corporation for providing financial support for this project. I am especially grateful to Jack L. Young and Jack D. Corbett for their guid­ ance and encouragement during the past year and a half. I also thank John and Marianne Kaur of Digitgraph Computer Systems, Tucson, Arizona for their time and assistance with the computer-related aspects of the thesis. The assistance and helpful suggestions of my advisor. Dr. John S. Sumner, and of D rs. George H. Davis and Robert F. Butler were greatly appreciated. James L. Kelly, chief geologist, ANAMAX Mining Company, Tucson, was especially helpful in arranging to make available unpub­ lished drill-hole data. I also thank Glenn Zinn of Minerals Exploration Company, Tucson, for allowing me to review several unpublished reports on the Canelo Hills and Whetstone Mountains, and Jeff Randall, a gradu­ ate student in the Department of Hydrology, The University of Arizona, for sharing the geologic map of the Elgin quadrangle that he received from R. B. Raup of the U.S. Geological Survey, Denver, Colorado. Helpful criticism and suggestions were provided by Donald J. Robinson, a former graduate student, and Dr. Charles W. Stockton of the Tfee- Ring Laboratory, The University of Arizona. I would also like to extend special thanks to Dr. Carlos L. V. Aiken, Texas Christian University, Fort Worth, Texas, who through his ill iv patience, encouragement, and numerous discussions of all aspects of geophysics made the last two and a half years especially rewarding. I would like to thank Allan Hennessey of Cities Service Minerals Cor­ poration for providing information on the geology of the Santa Rita Moun­ tains and Elmer J. Hauer, Chief, DOD Gravity Services Division, Defense Mapping Agency, St. Louis Air Force Station, Missouri, for the most recent theoretical gravity formula and a description of the International Gravity Standardization Net, 1971. TABLE OF CONTENTS Page LIST OF ILLUSTRATIONS....................................................................................... v ii LIST OF TABLES............................................................................................................v iii ABSTRACT............................... lx INTRODUCTION........................................................................................................ 1 Purpose and S co p e........................................................................................ 2 Previous W o r k ................................................................................................. 4 GEOLOGY OF THE CIENEGA CREEK AREA......................................................... 6 Bedrock C om plex............................. CD CO PreCambrian Rocks................ Paleozoic Rocks ................... Trias sic and Ju ra ssic R ocks............................................................... 11 C retaceous R o c k s .................................................................................. 13 Late Cretaceous and Tertiary Igneous R ocks .......................................... 15 V alley -fill and Surficial D e p o s its ............................................................ 17 Structural S e t t i n g ........................................................................................... 17 Santa Rita M ountains........................................................................... 17 C anelo H i l l s ........................................................................................... 19 Huachuca M ountains ........................................................................... 21 M ustang M o u n ta in s............................................................................... 22 Whetstone Mountains........................................................................... 22 Empire M o u n ta in s .................................................................................. 23 Structural H is to r y ........................................................................................... 24 GRAVITY DATA COLLECTION AND REDUCTION................................................ 26 Data Collection ....................................................................... 26 Instru m en tatio n ................................................................................................. 28 G ravity D ata R eduction.................................................................................. 28 Tide C o rrectio n ........................................................................................ 29 D rift C o r r e c tio n ..................................................................................... 29 Latitude C o r r e c tio n ...................................................................................30 Free-air Correction ..................................... 31 Bouguer C o r r e c tio n ............................................................................... 31 Curvature Correction ........................................................................... 32 Terrain C o rre c tio n .................................................................................. 33 G ravity A n o m alies.................................................................................. 33 Error A n a ly sis.................................................................................................... 34 v vi TABLE OF CONTENTS—Continued Page D rill-hole D a ta .......................................................................................... ... 38 D ensity D a t a ....................................................................... 41 INTERPRETATION ................................................................................. 43 R egional—Residual S e p a ra tio n ......................................................................44 R esidual G ravity Anomaly M a p .................................................................. 50 D ensity C o n tra st............................................... .....'...............................57 T w o-dim ensional M o d e lin g ........................................................................ 59 Profile A n a ly s is ..................................................................................................61 Aeromagnetic D a ta ...............................................................................................67 C o n c lu sio n s.................................. 69 REFERENCES................................................................................................................. 71 LIST OF ILLUSTRATIONS Figure Page 1. Location map of the study area ........................................................... 3 2 Geologic map of the Cienega Creek area, showing locations of gravity stations and drill h o les ................in pocket 3. Complete Bouguer gravity anomaly map of the C ienega C reek a r e a ..................................................................in pocket 4. First-harmonic trend surface of West and Sumner's (1973) Bouguer gravity anomalies using mean se a level as d a tu m ........................................................................... 46 5. Relationship between topography, gravity reduction datums, and resulting anom alies ............................................... 47 6. First-harmonic trend surface of digitized terrain e le v a tio n s .............................................................................................. 49 7. Regional Bouguer gravity anomaly map of the C ienega C reek a r e a ........................................................................... 51 8. Residual gravity anomaly map of the Cienega
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