• Abstract and Figures
• Public Full-text

An exploration gravity survey in the San Pedro Valley, southeastern Arizona Item Type text; Thesis-Reproduction (electronic); maps Authors Halvorson, Phyllis Heather Fett 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 27/09/2021 12:54:48 Link to Item http://hdl.handle.net/10150/557989 AN EXPLORATION GRAVITY SURVEY IN THE SAN PEDRO VALLEY, SOUTHEASTERN ARIZONA b y Phyllis Heather Fett Halverson A Thesis Submitted to the Faculty of the DEPARTMENT OF GEOSCIENCES In Partial Fullfillment of the Requirements For the Degree of MASTER OF SCIENCE WITH A MAJOR IN GEOPHYSICS In the Graduate College THE UNIVERSITY OF ARIZONA 1 9 8 4 — r I i ,, >——» OQ a Call No. BINDING INSTRUCTIONS INSTRUCTIONS INTERUBRARY STATEMENT BY AUTHOR This thesis has been submitted in partial fulfillment of require­ ments 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 quotations 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 School when in his judg­ ment the proposed use of the material is in the interests of scholarship. In o.U other instances, however, permission must be obtained from the author. SIGNED: Zvl/i CdOx APPROVAL BY THESIS DIRECTOR This thesis has been approved on the date shown below: \ J. S. SUMNER Date Professor of Geophysics ACKNOWLEDGMENTS I would like to thank my advisor, Dr. John S. Sumner, for initiating this project and encouraging me to develop a complete and descriptive final product. I would also like to thank the other members of my thesis committee, Drs. Randall M. Richardson and Robert F. Butler, who have also taken the time to review this thesis. A very dynamic lady, H. R. Hauck, has edited and typed the thesis. Richard S. Brokaw drafted my figures and maps and is responsible for their professional look. The data collection in the northern San Pedro Valley was organized and carried out by Kurt Kretvix, with the help of Paul Boissevain, Siki Sene, and Randy Himes. Boissevain and Himes also helped me process the data from the northern San Pedro Valley. I would like to thank John D. Fett of Earth Science and Engineering, Inc., of Hemet, California, for supervising me while I gathered new data in the southern San Pedro Valley. Mr. Fett also assisted in obtaining additional gravity data in the southern San Pedro Valley that had been gathered by Earth Science and Engineering em­ ployees for Tenneco. I would like to thank Tenneco, Englewood, Colorado, for allowing roe to use these gravity data. Simple Bouguer anomaly values for my data were calculated by Earth Science and Engi­ neering . I would like to thank Donald R. Pool for accompanying us occa­ sionally in the field and more importantly for finding the pertinent iii iv maps, well logs, and reports at the U.S. Geological Survey Water Re­ sources Division. Dr. Denis L. Norton and his daughter Debbie, surveyed the line south of Knob Hill for me. Dr. Norton also had numerous interesting chats with me and provided references on the geology of the Dragoon Mountains while I was developing the depth-to-bedrock map and the interpretation section of this thesis. Stanley G. Davis reviewed the data processing programs thoroughly and brought discrepancies between the various programs to my attention. I would like to thank my parents for providing me with a pleasant abode for the duration of my stay in Tucson. I would also like to thank my father, John D. Fett, for the ample loans that made finishing this thesis possible. I would like to thank my friends and loved ones for being such great amigos. This research was financed in part by the U.S. Department of the Interior, as authorized by the Water Research and Development Act of 1978 (P.L. 95-567). This research was also supported by Project A-108-ARIZ. TABLE OF CONTENTS Page LIST OF ILLUSTRATIONS................................................................................. vii LIST OF T A B L E S ........................................................................................................viii A B S T R A C T ................................................................................................................ ix 1. INTRODUCTION....................................................................................................... 1 2. DATA COLLECTION.............................................................................................. 7 3. DATA PRO CESSING ..................................................... 11 Input P a r a m e te r s .......................................................................................... 11 Data R e d u c t io n .............................................................................................. 12 Southern San Pedro Valley Da ta .................................................... 12 N orthern San Pedro Valley Da ta .................................................... 12 G ravity C o r r e c tio n s..................................................................................... 13 T heoretical S ea-level G r a v i t y ...................................................... 13 Free-air Anomaly ................................................................................. 14 B ouguer G ravity A n o m a ly ............................................................... 16 T errain C o r r e c tio n s............................................................................ 17 Regional C o r r e c tio n ............................................................................ 18 Arizona G ravity Data B a se........................................................................ 18 4. PLOTTING AND CONTOURING D A T A ...................................................... 20 P osting Stations and D a t a ........................................................................ 20 Contouring D a t a ................................................................................ .... 20 5. GENERAL GEOLOGY OF THE SAN PEDRO VALLEY.............................. 22 P re-B asin and Range G e o lo g y ............................................................... 22 Basin and Range D is tu r b a n c e ............................................................... 24 Basin Alluvial F i l l .......................................................................................... 25 General G eom orp h ology............................................................................. 27 6. H Y D R O LO G Y ............................................................................................................ 29 Upper San Pedro H ydrologic B a sin ...................................................... 29 Lower San Pedro H ydrologic B a sin ................................................. 30 v vi TABLE OF CONTENTS—C ontinued Page 7. DEPTH-TO-BEDROCK MODELING................................................................... 32 Preliminary Depth Estimates................................................................... 32 Two-dim ensional M o d e lin g ........................................................................ 36 Three-dimensional M odeling ................................... 38 8. INTERPRETATION................................................................................................... 39 Lower San Pedro H ydrologic B a sin ...................................................... 39 Upper San Pedro H ydrologic B a sin ...................................................... 44 Volume of Ground W ater............................................................................ 57 9. SUMMARY AND CONCLUSIONS........................................................................ 61 REFERENCES............................................................................................................ 64 LIST OF ILLUSTRATIONS Figure Page 1. Map of the San Pedro Valley showing its principal fe a tu r e s ...................... 2 2. Benson base station two (BN2)............................................................... 10 3. Gravity station location map, San Pedro Valley, A r iz o n a ................................................................................................... in pocket 4. Depth to bedrock versus anomalous gravity value for quick estimate pu rp ose ......................................................................... 35 5. Complete Bouguer gravity anomaly map, San Pedro Valley, Arizona ................................................................................. in pocket 6. Residual Bouguer gravity anomaly map, San Pedro Valley, Arizona ................................................................................. in pocket 7. Depth-to-bedrock map, San Pedro Valley, Arizona . in pocket 8. D ep th -to -b e drock profile of line 1 ........................................................ 41 9. Depth-to-bedrock profile of line 2 ....................................................... 42 10. Depth-to-bedrock profile of line 3 ......................................................

Load more

  91

Copy Link