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Jurassic and Cretaceous Tectonic Evolution of the Southeast Castle Dome Mountains, Southwest Arizona Jonathan Hunter Reis Iowa State University

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Jurassic and Cretaceous Tectonic Evolution of the Southeast Castle Dome Mountains, Southwest Arizona Jonathan Hunter Reis Iowa State University Iowa State University Capstones, Theses and Graduate Theses and Dissertations Dissertations 2009 Jurassic and Cretaceous tectonic evolution of the southeast Castle Dome Mountains, southwest Arizona Jonathan Hunter Reis Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/etd Part of the Earth Sciences Commons Recommended Citation Reis, Jonathan Hunter, "Jurassic and Cretaceous tectonic evolution of the southeast Castle Dome Mountains, southwest Arizona" (2009). Graduate Theses and Dissertations. 12198. https://lib.dr.iastate.edu/etd/12198 This Thesis is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Graduate Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. Jurassic and Cretaceous tectonic evolution of the southeast Castle Dome Mountains, southwest Arizona by Jonathan Hunter Reis A thesis submitted to the graduate faculty in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Major: Geology Program of Study Committee: Carl E. Jacobson, Major Professor Paul Spry Chris Harding Iowa State University Ames, Iowa 2009 Copyright © Jonathan Hunter Reis, 2009. All rights reserved. ii Table of Contents List of Figures ................................................................................................................... iv List of Tables .......................................................................................................................v Abstract.............................................................................................................................. vi Introduction........................................................................................................................ 1 Regional Background ........................................................................................................ 3 Proterozoic Igneous and Metamorphic Terranes...................................................................3 Paleozoic Passive Margin Sequence.........................................................................................5 Mesozoic Arcs ............................................................................................................................5 Mesozoic Basins .........................................................................................................................6 McCoy Basin and McCoy Mountains Formation ..................................................................................8 Winterhaven Formation .........................................................................................................................9 Rocks of Slumgullion ..........................................................................................................................10 Pelona-Orocopia-Rand (POR) Schists...................................................................................10 Cenozoic Sequences .................................................................................................................12 Methods ............................................................................................................................ 13 Field Methods...........................................................................................................................13 Petrology...................................................................................................................................13 Geochronology .........................................................................................................................13 40Ar/39Ar Geochronology.....................................................................................................................13 LA-MC-ICPMS ...................................................................................................................................15 ArcGIS Geologic Map...................................................................................................... 17 Geologic Units in the Southeast Castle Dome Mountains ............................................. 19 Orocopia Schist........................................................................................................................19 Gneiss........................................................................................................................................24 Mesozoic Granitoids................................................................................................................25 Jurassic Monzogranite .........................................................................................................................26 Speckled Granite-Leucogranite ...........................................................................................................26 Rocks of Slumgullion...............................................................................................................27 Early Miocene Volcanic Rocks...............................................................................................29 U-Pb Zircon Analyses ...................................................................................................... 31 Zircon Distribution Patterns ..................................................................................................31 Ages and Distributions of Zircons..........................................................................................33 Rocks of Slumgullion ..........................................................................................................................33 Monzogranite.......................................................................................................................................36 Orocopia Schist....................................................................................................................................36 iii Previous Zircon Distribution Studies ....................................................................................38 Jurassic Ergs ........................................................................................................................................38 Winterhaven Formation .......................................................................................................................40 McCoy Mountains Formation..............................................................................................................41 Pelona-Orocopia-Rand (POR) Schists.................................................................................................42 Discussion .................................................................................................................................43 Rocks of Slumgullion ..........................................................................................................................43 Orocopia Schist....................................................................................................................................46 Argon Dating....................................................................................................................48 Samples.....................................................................................................................................48 Results.......................................................................................................................................49 Discussion .................................................................................................................................49 Previous Studies...................................................................................................................................49 Castle Dome Mountains.......................................................................................................................54 Summary........................................................................................................................... 57 References ........................................................................................................................ 62 Appendix. Thin Section Descriptions............................................................................ 101 Acknowledgements......................................................................................................... 108 iv List of Figures Fig. 1. Pre-Miocene reconstruction of southern California and adjoining areas. ............... 4 Fig. 2. Configuration of McCoy basin (California-Arizona).............................................. 7 Fig. 3. ArcGIS geologic map of the southeast Castle Dome Mountains. ......................... 20 Fig. 4. Photomicrographs of textural features of the Orocopia Schist and gneiss............ 23 Fig. 5) Photomicrographs and hand specimen photograph of units within the rocks of Slumgullion....................................................................................................................... 30 Fig. 6. ArcGIS geologic map of sample locations............................................................ 32 Fig. 7. Zircon U-Pb relative age probability plots and cumulative probability plots for samples from the Castle Dome Mountains....................................................................... 35 Fig. 8. Zircon
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