Geologic Map of Detrital, Hualapai, and Sacramento Valleys and Surrounding Areas, Northwest Arizona Pamphlet to accompany Open-File Report 2011–1225 U.S. Department of the Interior U.S. Geological Survey This page intentionally left blank Geologic Map of Detrital, Hualapai, and Sacramento Valleys and Surrounding Areas, Northwest Arizona By L. Sue Beard, Jeffrey Kennedy, Margot Truini, and Tracey Felger Pamphlet to accompany Open-File Report 2011–1225 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Marcia K. McNutt, Director U.S. Geological Survey, Reston, Virginia 2011 For product and ordering information: World Wide Web: http://www.usgs.gov/pubprod Telephone: 1-888-ASK-USGS For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment: World Wide Web: http://www.usgs.gov Telephone: 1-888-ASK-USGS Suggested citation: Beard, L. Sue, Kennedy, Jeffrey, Truini, Margot, and Felger, Tracey, 2011, Geologic map of Detrital, Hualapai, and Sacramento Valleys and surrounding areas, northwest Arizona: U.S. Geological Survey Open-File Report 2011-1225, pamphlet 43 p., 1 map sheet, scale 1:250,000, available at http://pubs.usgs.gov/of/2011/1225/ Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 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Contents Introduction ......................................................................................................................................................................1 Physiography .......................................................................................................................................................... 1 Gravity Modeling ..................................................................................................................................................... 2 Geology ...........................................................................................................................................................................3 Introduction ............................................................................................................................................................. 3 Geologic Units ........................................................................................................................................................ 3 Proterozoic Basement Rocks ......................................................................................................................... 4 Paleozoic Sedimentary Rocks ........................................................................................................................ 4 Mesozoic and Cenozoic Intrusive Rocks ........................................................................................................ 5 Cenozoic Volcanic and Sedimentary Rocks ................................................................................................... 5 Pre-extension Sedimentary and Volcanic Rocks .................................................................................... 5 Syn-extensional Sedimentary and Volcanic Rocks ................................................................................ 6 Late-stage Interior Basin-fill Deposits ..................................................................................................... 6 Surficial Geology .................................................................................................................................... 7 Correlation of Cenozoic Sedimentary Rocks to Alluvial Aquifer Units of Previous Hydrogeologic Studies .... 7 Structure ................................................................................................................................................................. 7 Faults ............................................................................................................................................................ 8 Detachment Faults ................................................................................................................................. 8 Moderate- to High-angle Normal Faults ................................................................................................. 9 Inferred Basin Faults ............................................................................................................................ 10 Hualapai Valley ............................................................................................................................. 10 Detrital Valley .............................................................................................................................. 11 Sacramento Valley ........................................................................................................................ 11 Accommodation zone ................................................................................................................................... 11 Description of Subbasins Identified from Depth-to-bedrock Gravity Model .......................................................... 12 Detrital Valley ................................................................................................................................................ 12 Northern Detrital Subbasin ................................................................................................................... 12 Central Detrital Subbasin ...................................................................................................................... 13 Southern Detrital Subbasin ................................................................................................................... 14 Hualapai Valley ............................................................................................................................................. 14 Hualapai Subbasin ............................................................................................................................... 15 Kingman Subbasin ............................................................................................................................... 16 Southern Gregg Subbasin .................................................................................................................... 16 Sacramento Valley ........................................................................................................................................ 17 Chloride Subbasin ................................................................................................................................ 18 Golden Valley Subbasin ....................................................................................................................... 18 Dutch Flat Subbasin ............................................................................................................................. 18 Geologic History ............................................................................................................................................................19 Acknowledgments .........................................................................................................................................................21 Description of Map Units ...............................................................................................................................................21 Surficial Deposits (Quaternary and Pliocene) ....................................................................................................... 21 Consolidated Basin-fill Deposits (Pliocene, Miocene, and Oligocene) ................................................................. 23 i Volcanic Rocks (Pliocene, Miocene, and Oligocene) ........................................................................................... 25 Intrusive Rocks (Miocene and Cretaceous) .......................................................................................................... 27 Paleozoic Sedimentary Rocks .............................................................................................................................. 28 Proterozoic Crystalline Rocks ............................................................................................................................... 29 References Cited .................................................................................................................................................. 30 Figures 1. Shaded-relief map showing hydrologic basin boundary of Detrital, Hualapai, and Sacramento valley basins, and highways, towns, and other physiographic and cultural features referred to in text. ............................... 36 2. Depth-to-bedrock gravity model showing subbasins and estimated thickness of basin fill beneath Hualapai, Detrital, and Sacramento Valley basins.. ....................................................................................................... 37 3. Gravity data used to create depth-to-bedrock model, overlain by outline of map area. .......................................... 38 4. Regional geologic map showing major geologic features referred to in text. .........................................................