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A Geophysical Investigation of a Possible Astrobleme in Southwestern Michigan

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A Geophysical Investigation of a Possible Astrobleme in Southwestern Michigan Western Michigan University ScholarWorks at WMU Master's Theses Graduate College 4-1984 A Geophysical Investigation of a Possible Astrobleme in Southwestern Michigan Suhas L. Ghatge Follow this and additional works at: https://scholarworks.wmich.edu/masters_theses Part of the Geophysics and Seismology Commons Recommended Citation Ghatge, Suhas L., "A Geophysical Investigation of a Possible Astrobleme in Southwestern Michigan" (1984). Master's Theses. 1498. https://scholarworks.wmich.edu/masters_theses/1498 This Masters Thesis-Open Access is brought to you for free and open access by the Graduate College at ScholarWorks at WMU. It has been accepted for inclusion in Master's Theses by an authorized administrator of ScholarWorks at WMU. For more information, please contact [email protected]. A GEOPHYSICAL INVESTIGATION OF A POSSIBLE ASTROBLEME IN SOUTHWESTERN MICHIGAN by Suhas L. Ghatge A Thesis Submitted to the Faculty of The Graduate College in Partial Fulfillment of the requirements for the Degree of Master of Science Department of Geology Western Michigan University Kalamazoo, Michigan April 1984 Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. A GEOPHYSICAL INVESTIGATION OF A POSSIBLE ASTROBLEME IN SOUTHWESTERN MICHIGAN Suhas L. Ghatge, M.S. Western Michigan U n iv ers ity , 1984 A circular pattern to the oil production in Calvin Township, Cass County, Michigan, absence o f about 1200 fe e t of Ordovician sediments and uplift indicated by a deep drill hole in the center of the productive area and absence o f anomalies on the regional g ra vity and magnetic maps led to detailed gravity and magnetic surveys over this structure to delineate it and provide information regarding its genesis. The Bouguer g ra v ity and magnetic anomaly maps show no anomaly associated w ith the s tru ctu re. The 28-m ile wavelength second harmonic residual gravity and magnetic maps show linear features in the area. Two dimensional gravity modeling of the NNW-SSE trending linear feature over the area of circular production is interpreted as upthrusting involving the basement rocks. The NNW-SSE trending Jefferson fie ld appears to be truncated by NE-SW trending faults. The lack of a circular gravity anomaly and the lack of direct geologic evidence in support of the impact origin leaves the question of genesis open. Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. ACKNOWLEDGEMENTS This p roject would not have been possible without the funds from the Western Michigan University Graduate College Research Grants and the support of Dr. William Sauck who organized and developed many of the ideas in this investigation. I would like to thank him for his help. I would also like to thank Dr. Straw, Dr. Grace and Dr. Harrison for ideas, recommendations and inform ation. I am also thankful to Mr. Florencio Mata of Hosking Geophysical for suggesting this problem and Mr. Ron DeHaas o f Michigan Petroleum Geologists Inc. and Mr. Robert Mannes of Mannes Oil Corp. for providing some geologic and geophysical inform ation. Special thanks are extended to Mr. Douglas Daniels of the Michigan Department of Natural Resources fo r providing time fo r discussions and for making available geological information on the area. Thanks are also extended to the Department of Geology, Albion College, fo r providing th e ir Magnetometer and to the Computer Center a t Western Michigan U niversity fo r the computer time. Last, but not the least, I would like to express my deepest appreciation and thanks to my wife Gauri who helped me in my data collection and during the process of writing this report. Her care and patience were important and vital during all aspects of the survey. Suhas L. Ghatge Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. INFORMATION TO USERS This reproduction was made from a copy of a document sent to us for microfilming. While the most advanced technology has been used to photograph and reproduce this document, the quality of the reproduction is heavily dependent upon the quality of the material submitted. The following explanation of techniques is provided to help clarify markings or notations which may appear on this reproduction. 1.The sign or “target” for pages apparently lacking from the document photographed is “Missing Page(s)”. If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting through an image and duplicating adjacent pages to assure complete continuity. 2. 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These prints are available upon request from the Dissertations Customer Services Department. 5. Some pages in any document may have indistinct print. In all cases the best available copy has been filmed. University Mfcitffilms International 300 N. Zeeb Road Ann Arbor, Ml 48106 Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. 1 3 2 3 1 3 3 GHATGE, SUHAS LAXMAN A GEOPHYSICAL INVESTIGATION OF A POSSIBLE ASTROBLEME IN SOUTHWESTERN MICHIGAN WESTERN MICHIGAN UNIVERSITY M.S. 1984 University Microfilms International 300 N. Zeeb Road. Ann Arbor, MI 48106 Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. 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 V ■ 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 text 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. Other_____________________________________________________________ __ University Microfilms International Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. TABLE OF CONTENTS ACKNOWLEDGEMENTS ........................................................................................................ i i LIST OF FIGURES....................................................................................................... v LIST OF PLATES........................................................................................................... vi Chapter I . INTRODUCTION ........................................................................................... 1 Objective ................................................................................................... 1 Location ................................................................................................... 7 Physiography ........................................................................................... 7 Approach ................................................................................................... 7 I I . GEOLOGY......................................................................................................... 9 Regional Geology .................................................................................. 9 Local G eo lo g y ..................................................................................... 15 I I I . GRAVITY AND MAGNETIC SURVEYS OVER ASTROBLEMES ....................... 17 IV. FIELD METHODS............................................................................................ 27 Gravity Survey ...................................................................................... 27 Magnetic Survey ...................................................................................... 28 V. DATA REDUCTION AND PLOTTING.............................................................
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