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Geology of the Payette National Forest and Vicinity West-Central Idaho

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Geology of the Payette National Forest and Vicinity West-Central Idaho Geology of the Payette National Forest and Vicinity, West-Central Idaho Professional Paper 1666 Version 1.1, April 2021 Supersedes USGS Miscellaneous Geologic Investigations Map I–2599 and the GIS data in USGS Open-File Report 98–219–B U.S. Department of the Interior U.S. Geological Survey Cover. View to south of Big Creek airstrip and Edwardsburg in midground from McFadden Point. North end of hogback at airstrip is dated location of the Neoproterozoic Hogback Rhyolite Member of the Edwardsburg Formation, one of the herein named and dated formations of the Windermere Supergroup. Western and northern edge of Thunder Mountain caldera in peaks to left and middle of Profile Gap, and roof pendants of Windermere Supergroup floating above Cretaceous granite in peaks to right. Geology of the Payette National Forest and Vicinity, West-Central Idaho Frontispiece. A first publication on the Mesoproterozoic biotite gneiss migmatite (Ygn) of the Middle Fork Salmon River (date unknown). Geology of the Payette National Forest and Vicinity, West-Central Idaho By Karen Lund Chapter A Geologic Setting of the Payette National Forest, West-Central Idaho By Karen Lund Chapter B Description of Map Units for the Geologic Map of the Payette National Forest, West-Central Idaho By Karen Lund Chapters A and B are issued as a single volume and are not available separately Professional Paper 1666–A–B Version 1.1, April 2021 Supersedes USGS Miscellaneous Geologic Investigations Map I–2599 and the GIS data in USGS Open-File Report 98–219–B U.S. Department of the Interior U.S. Geological Survey U.S. Geological Survey, Reston, Virginia First release: 2004 Revised: April 2021 (ver. 1.1) For sale by U.S. Geological Survey, Information Services Box 25286, Denver Federal Center Denver, CO 80225 For more information about the USGS and its products: Telephone: 1-888-ASK-USGS World Wide Web: https://www.usgs.gov/ Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. Suggested citation: Lund, K., 2004, Geology of the Payette National Forest and vicinity, west-central Idaho (ver. 1.1, April 2021): U.S. Geological Survey Professional Paper 1666–A, –B, 89 p., https://doi.org/10.3133/pp1666. [Supersedes USGS Miscellaneous Geologic Investigations Map I–2599 and the GIS data in USGS Open-File Report 98–219–B.] Geologic Setting of the Payette National Forest, West-Central Idaho By Karen Lund Chapter A of Geology of the Payette National Forest and Vicinity, West-Central Idaho By Karen Lund Professional Paper 1666–A Version 1.1, April 2021 Supersedes USGS Miscellaneous Geologic Investigations Map I–2599 and the GIS data in USGS Open-File Report 98–219–B U.S. Department of the Interior U.S. Geological Survey xi Contents Abstract ...........................................................................................................................................................1 Introduction.....................................................................................................................................................1 Metamorphic Rocks of Laurentia ................................................................................................................2 Mesoproterozoic Rocks .......................................................................................................................2 Metasedimentary Strata .............................................................................................................2 Stratigraphic Packages .....................................................................................................4 Associated Mineral Deposits ...........................................................................................6 Metaplutonic Rocks ....................................................................................................................6 Neoproterozoic Rocks .........................................................................................................................8 Windermere Supergroup ............................................................................................................8 Gospel Peaks Succession A ...........................................................................................11 Gospel Peaks Succession B ...........................................................................................12 Gospel Peaks Succession C ...........................................................................................13 Gospel Peaks Succession D ...........................................................................................14 Correlation and Regional Significance .........................................................................14 Metaplutonic Rocks ..................................................................................................................14 Neoproterozoic and Cambrian(?) Marble .......................................................................................15 Early Ordovician–Late Cambrian Syenite-Diorite Pluton .............................................................15 Undivided Metamorphic Strata ........................................................................................................15 Rocks of Island-Arc Derivation..................................................................................................................15 Metamorphic Rocks of Blue Mountains Island Arc ......................................................................15 Baker Terrane .............................................................................................................................16 Wallowa Terrane ........................................................................................................................16 Olds Ferry Terrane .....................................................................................................................16 Izee Terrane ................................................................................................................................17 Metamorphosed Volcanic/Plutonic Complex .................................................................................17 Post-Amalgamation Intrusive Rocks ...............................................................................................18 Salmon River Suture Zone Complex .........................................................................................................18 Late Cretaceous Idaho Batholith ..............................................................................................................18 Eocene Challis Magmatic Complex ..........................................................................................................19 Challis Volcanic Group .......................................................................................................................20 Hypabyssal Intrusive Rocks ..............................................................................................................20 Weiser Embayment ......................................................................................................................................22 Columbia River Basalt Group ............................................................................................................22 Other Deposits of the Weiser Embayment ......................................................................................22 Quaternary Deposits....................................................................................................................................23 Metamorphic History...................................................................................................................................24 Proterozoic Metamorphism of Laurentian Rocks ..........................................................................24 Triassic Metamorphism of Island-Arc Basement ..........................................................................24 Late Jurassic to Early Cretaceous Metamorphism of Island-Arc Rocks ..................................24 Cretaceous Overprinting Metamorphism .......................................................................................24 xii Structure........................................................................................................................................................25 Proterozoic Deformation in Laurentian Rocks ...............................................................................25 Triassic Deformation in the Wallowa Terrane ................................................................................25 Late Middle Jurassic to Early Cretaceous(?) Deformation in Island-Arc Rocks .....................26 Late Jurassic to Early Cretaceous Deformation in Island-Arc Rocks .......................................26 Cretaceous Deformation ...................................................................................................................26 Structures West of the Salmon River Suture ........................................................................27 Thrust Faulting and Folding East of the Salmon River Suture ............................................28 Western Idaho Shear Zone ......................................................................................................31
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