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Geology and Mineral Resources of Park County, Colorado

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Geology and Mineral Resources of Park County, Colorado Resource Series 40 Geology and Mineral Resources of Park County, Colorado By L. Alex Scarbrough, Jr. LORAD O O C G E Y O E L V O U R G I CAL S Colorado Geological Survey Division of Minerals and Geology Department of Natural Resources Denver, Colorado 2001 Book and map designs by Cheryl Brchan Illustrations, and photos by Larry Scott Cover by Cheryl Brchan and Larry Scott Geology and Mineral Resources of Park County, Colorado ForewordForeword The purpose of Colorado Geological Survey Resource to provide geological information to resource develop- Series 40, Geology and Mineral Resources of Park County, ers, government planners, and interested citizens. Colorado is to describe the geological setting and to list Funding for this project came from the Colorado and describe the various mineral and mineral fuel Department of Natural Resources Severance Tax Oper- deposits of Park County. The report discusses the ational Fund. Severance taxes are derived from the known occurrences of precious and base metal production of gas, oil, coal, and minerals. deposits, industrial minerals, uranium deposits, coal, oil and gas, and the geothermal resources of Park James A. Cappa County. The report contains two maps, a geological Chief, Mineral Resources Section map and a mineral prospect map, both at a scale of 1:100,000. L. Alex Scarbrough, Jr. wrote this report in Vicki Cowart 1999 and early 2000. The objective of this publication is State Geologist and Director Colorado Geological Survey Resources Series 40 iii Geology and Mineral Resources of Park County, Colorado ContentsContents FOREWORD ______________________________________________________iii INTRODUCTION __________________________________________________1 GEOLOGIC SETTING ______________________________________________3 Summary_____________________________________________________________________3 Tectonic and Geomorphic History _______________________________________________6 STRATIGRAPHY ___________________________________________________7 Early Proterozoic Age (Approximately 1,700 Ma) Rocks ____________________________7 Metamorphic Rocks ________________________________________________________7 Amphibolite and Felsic Gneiss ___________________________________________7 Felsic Gneiss ___________________________________________________________7 Biotite Gneiss __________________________________________________________7 Migmatite _____________________________________________________________7 Amphibolite and Calc-Silicate Gneiss _____________________________________7 Igneous Rocks _____________________________________________________________7 Gabbro and Mafic Rocks ________________________________________________7 Granitic Rocks _________________________________________________________8 Quartz Diorite _________________________________________________________8 Granodiorite ___________________________________________________________8 Quartz Monzonite and Granodiorite ______________________________________8 Middle Proterozoic Age (Approximately 1,400 Ma) Rocks __________________________8 Granitic Rocks _____________________________________________________________8 Cripple Creek Quartz Monzonite of Silver Plume Age __________________________8 Quartz Monzonite of Elevenmile Canyon _____________________________________8 Quartz Monzonite _________________________________________________________8 Cripple Creek Quartz Monzonite ____________________________________________8 Pegmatite and Aplite (Early to Middle Proterozoic) ____________________________8 Middle Proterozoic Age (Approximately 1,000 to 1,100 Ma) Rocks ___________________8 Rocks of Pikes Peak Batholith _______________________________________________8 Pikes Peak Granite______________________________________________________9 Tarryall Creek Pluton of the Pikes Peak Batholith___________________________9 Redskin Stock of the Pikes Peak Batholith _________________________________9 Fine-Grained Granite ________________________________________________9 Colorado Geological Survey Resources Series 40 v Geology and Mineral Resources of Park County, Colorado Contents Continued Prophyritic Granite________________________________________________________________9 Medium-Grained Granite ____________________________________________9 Lake George Pluton of the Pikes Peak Batholith ____________________________9 Phanerozoic Rocks_____________________________________________________________9 Paleozoic Sedimentary Rocks ________________________________________________9 Cambrian Rocks________________________________________________________9 Sawatch Quartzite (Upper Cambrian) _________________________________9 Peerless Shale (Upper Cambrian) _____________________________________9 Ordovician Rocks _____________________________________________________10 Manitou Dolomite (Lower Ordovician) _______________________________10 Harding (Quartzite) Sandstone (Middle Ordovician) ___________________10 Fremont Dolomite (Upper Ordovician) _______________________________10 Devonian Rocks _______________________________________________________10 Chaffee Group (Upper Devonian and Lower Mississippian) _____________10 Mississippian Rocks ___________________________________________________10 Leadville Limestone (Lower Mississippian) ___________________________10 Pennsylvanian Rocks __________________________________________________10 Minturn Formation (Middle and Lower Pennsylvanian) ________________10 Belden Formation (Lower Pennsylvanian)_____________________________11 Weber Formation (Permian and Pennsylvanian)________________________11 Sangre de Cristo Formation (Permian and Pennsylvanian) ______________11 Maroon Formation (Permian and Pennsylvanian) ______________________11 Paleozoic Igneous Rocks ___________________________________________________11 Diabase (Ordovician and Cambrian) _____________________________________11 Mesozoic Rocks___________________________________________________________11 Jurassic Rocks_________________________________________________________11 Entrada Formation (Upper Jurassic) __________________________________11 Morrison Formation (Upper Jurassic) _________________________________11 Cretaceous Rocks _____________________________________________________11 Dakota Sandstone (Lower Cretaceous) ________________________________11 Graneros Shale (Upper Cretaceous) __________________________________11 Greenhorn Limestone (Upper Cretaceous)_____________________________11 Carlisle Shale (Upper Cretaceous)____________________________________12 Niobrara Formation (Upper Cretaceous) ______________________________12 Pierre Shale (Upper Cretaceous) _____________________________________12 Fox Hills Sandstone (Upper Cretaceous) ______________________________12 Laramie Formation (Upper Cretaceous)_______________________________12 Cretaceous Igneous Rocks ______________________________________________12 Whitehorn Granodiorite ____________________________________________12 Tertiary-Cretaceous Rocks ______________________________________________12 Intrusive Rocks (Eocene, Paleocene, Upper Cretaceous) _________________12 Cenozoic Sedimentary Rocks _______________________________________________13 Tertiary Sedimentary Rocks_____________________________________________13 vi Colorado Geological Survey Resources Series 40 Geology and Mineral Resources of Park County, Colorado Contents Continued South Park Formation (Paleocene) ___________________________________13 Echo Park Alluvium (Eocene) _______________________________________13 Tallahassee Creek Conglomerate (Oligocene) __________________________13 Florissant Lake Beds (Oligocene)_____________________________________13 Antero Formation (Oligocene) _______________________________________13 Wagontongue Formation (Miocene) __________________________________13 Gravel (Pliocene? Or Miocene)_______________________________________14 Dry Union Formation (Pliocene and Miocene) _________________________14 Tertiary Igneous Rocks _________________________________________________14 Latite Porphyry (Eocene) ___________________________________________14 Tertiary Intrusive Rocks (Oligocene)__________________________________14 Wall Mountain Tuff (Oligocene)______________________________________14 Thirtynine Mile Andesite (Oligocene)_________________________________14 Rocks of the Guffey Volcanic Center (Oligocene) _______________________14 Andesite (Oligocene) _______________________________________________14 Ash-flow Tuff ((Oligocene) __________________________________________14 Inter-Ash Flow Andesitic Lavas and Breccias (Oligocene) _______________15 Gribbles Park Tuff (Oligocene)_______________________________________15 Buffalo Peaks Andesite (Oligocene) __________________________________15 Badger Creek Tuff (Oligocene) _______________________________________15 Basalt (Miocene) ___________________________________________________15 Quaternary Alluvial Sediments__________________________________________15 Alluvial Deposits __________________________________________________15 Alluvium and Colluvium (Holocene and Pleistocene) __________________16 Landslide Deposits (Holocene and Pleistocene) ________________________16 Glacial Deposits ___________________________________________________16 STRUCTURAL GEOLOGY _________________________________________17 Major Faults _________________________________________________________________17 Mosquito Fault ___________________________________________________________17 London Fault _____________________________________________________________17 Sherman Fault ____________________________________________________________17
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