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N G The Journal of The Tobacco Root Geological Society Volume 46, July 2017 42nd Annual Field Conference Geology of the Leadore Area and Other Papers July 27–30, 2017 View south of Yellow Lake in the central Lemhi Range—type locality of the Yellow Lake Formation. Photo by Jeff Lonn. Published by The Tobacco Root Geological Society, Inc. P.O. Box 118 Butte, Montana 59703 http://trgs.org Edited by: Bruce Cox, Phyllis A. Hargrave, and Katie McDonald i The Tobacco Root Geological Society, Inc. P.O. Box 118 Butte, Montana 59703 Offi cers, 2017: President: Jesse Mosolf, Montana Bureau of Mines and Geology, Butte, MT Vice-President: William M. Phillips, Idaho Geological Survey, Moscow, ID Treasurer: Katie McDonald, Montana Bureau of Mines and Geology, Butte, MT Secretary: Emily Geraghty Ward, Rocky Mountain College, Billings, MT Corresponding Secretary: Lara Strickland, Columbus, MT Webmaster: Dick Gibson, Consultant, Butte, MT Board of Directors, 2017: Ted Antonioli, Geologist, Missoula, MT Bruce E. Cox, Geologist (semi-retired), Missoula, MT Larry Johnson, Consultant, Missoula, MT Larry N. Smith, Dept. of Geological Engineering, Montana Tech, Butte, MT Mike Stickney, Montana Bureau of Mines and Geology, Butte, MT Robert C. Thomas, Dept. of Environmental Sciences, U. of Montana-Western, Dillon, MT Emily Geraghty Ward, Geology Dept., Rocky Mountain College, Billings, MT 2017 Conference Organizers: Bruce Cox, Geologist, Missoula, Montana Editors: Bruce Cox, Phyllis A. Hargrave (MBMG), and Katie McDonald (MBMG) Layout and Editing: Susan Barth (MBMG) Printed by Insty-Prints, Butte, Montana ISSN: 0096-7769 © 2017 The Tobacco Root Geological Society, Inc. http://trgs.org ii N G The Journal of The Tobacco Root Geological Society Volume 46, July 2017 Geology of the Leadore Area and Other Papers TABLE OF CONTENTS Link and Cox Development of geologic thought on the Lemhi and Beaverhead ranges ...........................................1 Burmester, Lewis, and Were we wrong? Second thoughts on geology of the Lemhi Basin ....................................................7 Lonn Jeff Lonn The Lemhi Group type section revisited and revised, east-central Idaho ............................................15 Pearson, Anderson, and Zircon U-Pb and LU-Hf analysis of basement rocks at Bloody Dick Creek and Maiden Peak, Link southwestern Montana: A record of Paleoproterozoic and Archean plutonism and metamorphism ...29 Kevin Lielke A geodynamic model for gravity-driven extension—Implications for the Cenozoic evolution of southwestern Montana .........................................................................................................................37 Stuart D. Parker Dividing the Beaverhead group at the Continental Divide ..................................................................45 Eastman, Doolittle, The Mount Evans gossan: A source of natural acid rock drainage and possible source of metals Gammons, and Poulson and sulfur for the Butte porphyry-lode orebodies ...............................................................................67 Vice and Hauptman Rare earth elements in a placer in Halfway Park, Jeff erson County, Montana ....................................75 Mitchell, Garverich, and Abstracts ..............................................................................................................................................81 Cuccio Thackray and Colandrea Glaciation of the central Lemhi range, Idaho .....................................................................................89 Cox and Antonioli Ore controls of the Leadville (Junction) and Gilmore mining districts, Lemhi County, Idaho: A fi eld trip guide..................................................................................................................................93 Pearson and Link Field guide to the Lemhi Arch and Mesozoic-Early Cenozoic faults and folds in east-central Idaho: Beaverhead Mountains .............................................................................................................101 Elliott and Lonn Walking tour of the Monument Fault near the confl uence of Bloody Dick Creek and Horse Praire Creek, southwestern Montana .............................................................................................................113 FIELD GUIDES Lewis, Gillerman, Road log to the geology and mineralization of the Agency Creek and Lemhi Pass areas, Idaho Burmester, Mosolf, and and Montana .........................................................................................................................................119 Lonn Little and Clayton Field guide to the compressional structures along the western margin of the southern Beaverhead Mountain range, Scott Butte 7.5’ quadrangle, east-central Idaho ........................................................133 Brenner-Younggren and Lithologic and structural controls of mineral deposits in the Horse Prairie basin, Beaverhead Cox County, Montana, with notes on Horse Prairie history ........................................................................143 Stuart D. Parker Tension faults of the Centennial Shear Zone .......................................................................................153 iii TRGS 2017 SCHOLARSHIP AWARD WINNERS • Andrew Canada (TRGS) University of Idaho The Eocene Elko Formation: A Paleogeographic Record of High-Elevation Lake Basin Formation and Topographic Evolution in the North American Cordilleran Hinterland • Philip Dalhof (Foster) Colorado State University Mapping of hydrothermal alterations in the Boulder Batholith and related igneous rocks using a pXRF • Garrett Hill (Harrison) Montana Tech Using fl uid inclusions and C, O, H, and Sr isotopes to understand the genesis of dolomite-hosted talc mineralization in Montana • Erin Lathrop (Harrison) Utah State University Capturing changes in the Mesoproterozoic carbon cycle: C-isotope stratigraphy of the 1255 Ma Bass Formation, Grand Canyon Supergroup, AZ • Zachary Lettenga (Foster) Montana Tech Prospecting Placer Gold in Libby Creek • Jacob McCane (Foster) Colorado State University The Petrogenesis of Lamprophyric Rocks of the Absaroka Volcanic Province and their Association with Gold Mineralization • William Moynihan (TRGS) Idaho State University Paleontology and sequence stratigraphy of the near-shore facies of the Permian Phosphoria Formation in the Teton, Gros Ventre, and Wind River ranges, Wyoming • Ashely Provow (Skipp) Utah State University Reconstructing paleofl uidrock interactions using electron microprobe dating of authigenic monazite in Neoproterozoic sandstones • Jacob Thacker (TRGS) University of New Mexico Regional tectonic analysis of Laramide orogenesis using fi eld studies, apatite fi ssion track, and (U-Th)/He thermochronology • Richard Trippe (Harrison) University of Montana Geology of a structurally inverted graben of possible Cambrian age, southern Pioneer Mountains, southwestern Montana • Matthew Wanker (TRGS) Indiana University Tracking sediment through a river bifurcation on the Jeff erson River, MT • Mike Zawaski (TRGS) University of Colorado, Boulder Stromatolites as chemical and isotopic probes of paleoenvironmental conditions during the Permian-Triassic extinction event iv TRGS HAMMER AWARD TRGS CHARTER MEMBERS RECIPIENTS Stanley W. Anderson Clyde Cody William S. Cordua Awarded for distinguished achievement Lanny H. Fisk in the study of the geology of the Richard I. Gibson† Northern Rocky Mountains Thomas Hanley Stephen W. Henderson 1993: Ed Ruppel* Thomas E. Hendrix 1994: Dick Berg Mac R. Hooton Inda Immega 2003: Don Winston Steven W. Koehler 2004: Dean Kleinkopf* Marian Millen Lankston† 2009: Betty Skipp Robert W. Lankston† 2010: Jim Sears J. David Lazor Joe J. Liteheiser, Jr. 2011: John Childs Judson Mead* 2012: J. Michael O’Neill Marvin R. Miller 2013: Paul Karl Link Vicki M. Miller Allen H. Nelson 2014: Reed Lewis Alfred H. Pekarek 2015: Jeff Lonn Patricia Price* 2016: Bruce Cox Donald L. Rasmussen Raymond M. Rene TRGS HONORARY MEMBERS 1980: Charles J. Vitaliano* TRGS LIFETIME MEMBERS 2008: Elizabeth Younggren John Childs (also honorary Board member) Rob Foster 2010: Dick Berg Joan (Mrs. Jack) Harrison* Karen Keefer 2010: Bruce Cox Layaka Mann 2010: Dean Kleinkopf* Chris Pool 2010: Dave Lageson 2011: Marie Marshall Garsjo 2011: Paul Link 2011: Rob Thomas † = co-founder 2012: Jeff Lonn * = deceased 2012: Mitch Reynolds 2013: Reed Lewis 2015: Don Winston v DEDICATIONS EDWARD T. RUPPEL (1925–2014) The Tobacco Root Mountains were the backdrop for many years of Ed Ruppel’s life–fi rst his birth, child- hood, and youth in Twin Bridges, Montana, and then full-circle to his retirement years. During the interven- ing period, Leadore, Idaho became a second special place for Ed and his family as he worked many years in the Lemhi Range. Ed was a faithful Tobacco Root Geological Society member and received the TRGS’s fi rst award for Excellence in Field Work. He authored more than 50 signifi cant geologic maps and geologic research publications in western Montana and eastern Idaho. Colleagues admired Ed for many decades as a quintessential fi eld geologist. It is most appropriate that we dedicate this volume to Ed! Ed left Twin Bridges after high school to serve in the U.S. Navy, and then obtained degrees from University of Montana, University of Wyoming, and a Ph.D. from Yale University. His subsequent 30-year career with the U.S. Geological Survey produced numerous classic publications on the geology of western Montana, east- ern Idaho, and Yellowstone National
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