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Geology of the Abajo Mountains Area San Juan County, Utah

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Geology of the Abajo Mountains Area San Juan County, Utah Geology of the Abajo Mountains Area San Juan County, Utah GEOLOGICAL SURVEY PROFESSIONAL PAPER 453 Prepared on behalf of the U.S. Atomic Energy Commission Geology of the Abajo Mountains Area San Juan County, Utah By IRVING J. WITKIND GEOLOGICAL SURVEY PROFESSIONAL PAPER 453 Prepared on behalf of the U.S. Atomic Energy Commission A study of a major laccolithic center on the Colorado Plateau UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1964 UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director The U.S. Geological Survey Library has cataloged this publication as follows : Witkind, Irving Jerome, 1917- Geology of the Abajo Mountains area, San Juan County, Utah. Washington, U.S. Govt. Print. Off., 1964. v, 110 p. illus., maps (1 col.) diagrs., tables. 29 cm. (U.S. Geo­ logical Survey. Professional paper 453) Part of illustrative matter fold, in pocket. Prepared on behalf of the U.S. Atomic Energy Commission. Bibliography: p. 107-108. 1. Geology Utah San Juan Co. I. Title: Abajo Mountains area, San Juan County, Utah. (Series) For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, B.C., 20402 CONTENTS Page Page Abstract.._________________________________________ 1 Structural geology. _____-__-_-_-_-____-_-------_---- 41 Introduction.______________________________________ 1 Structural features unrelated to i ntrusions _________ 42 Location_ ____________________________________ 3 Grabens _____-__----__-___-----_-_--------- 42 Transportation.________________________________ 3 Shay graben. .._______-__________-_-_--- 42 Geography and climate__________________________ 3 Verdure graben__ _ ______________--__--_- 45 Previous work__________________________________ 5 Igneous intrusions and related structural features. __ 46 Present investigation.___________________________ 6 The intrusions...-. -_----_--_----_---------- 46 Acknowledgments ______________________________ 7 East Mountain stock and related laccoliths. 47 Stratigraphy _______________________________________ 7 Abajo Peak laccolith. ______-_-_-_--_ 54 Concealed formations._-___--___-_____-_________ 7 Locust laccolith___ ____________----_ 54 Permian System._______________________________ 7 Jackson Ridge laccolith _ ___________ 55 Cutler Formation.__________________________ 7 Twin Peaks laccolith- _ ______________ 55 Organ Rock Tongue ____________________ 11 South Robertson Pasture laccolith. ___ 56 Triassic(?) and Triassic System.__________________ 11 North Robertson Pasture laccolith____ 56 Moenkopi Formation______________________ 11 Horsehead laccolith. _ _______________ 57 Hoskinnini Member..___________________ 11 Pole Creek laccolith.. _ ______________ 58 Upper unit____________________________ 11 Inferred laccolith under Corral anti­ Triassic System.______________________________ 13 cline ______-_-__-__--_-_----_--_- 58 Chinle Formation.._________________________ 13 Inferred laccolith under Spring Creek Shinarump Member..___________________ 13 anticline. ________-_-__-_---_----_ 59 Lower unnamed member.______________ 13 Gold Queen laccolith. _______________ 59 Moss Back Member___-___^___________ 14 South Creek laccolith.. _____________ 60 Upper unnamed member________________ 15 South Peak laccolith. _______________ 60 Glen Canyon Group...._____________________ 17 Dickson Creek laccolith ______-_-___- 60 Wingate Sandstone.____________________ 17 Verdure laccolith ___________________ 60 Triassic(?) System._____________________________ 17 Kayenta Formation.________________________ 17 Arrowhead laccolith.. _ ______________ 61 Triassic(?) and Jurassic Systems__-_______________ 18 Knoll laccolith_____________.___--_- 61 Navajo Sandstone._________________________ 18 Camp Jackson laccolith____--_ ------- 61 Jurassic System. _______________________________ 19 West Mountain stock and related laccoliths _ 62 San Rafael Group._________________________ 19 Shay Ridge laccolith. _______________ 63 Carmel Formation._____________________ 19 Indian Creek laccolith ______-___-_- 64 Entrada Sandstone____________________ 22 Dry Wash laccolith- _________-----_- 64 Moab Sandstone Member__________ 23 Mount Linnaeus laccolith_____ _______ 65 Summerville Formation________________ 24 Alien Canyon laccolith ______________ 65 Morrison Formation. _______________________ 25 Johnson Creek stock (?) and related lac­ Salt Wash Member.____________________ 25 Brushy Basin Member.. ________________ 27 coliths. .._______----_-_-_------------- 66 Cretaceous System..____________________________ 27 Prospect laccolith.. _ ____-__--_--_--_ 68 Dakota Sandstone and Burro Canyon Forma­ Scrub Oak laccolith_-__---___------- 69 tion.. ____________________________________ 27 Porcupine laccolith _ _ _ _____________ 69 Mancos Shale._____________________________ 30 Ridge laccolith____________--------- 71 Quaternary System.____________________________ 30 Viewpoint laccolith. ..________--__--- 71 Alluvium. _________________________________ 30 Shay Mountain stock (?) and related lac­ Dune sand_________________________________ 31 coliths _ __--__-____-_-----_--------- 71 Colluvium. ________________________________ 31 Shay Canyon laccolith (?)_______----_ 72 Rockslide and boulder-field deposits...-------- 31 North Flank laccolith (?).__..___._-_ 72 Pediment deposits__________________________ 32 73 Igneous rocks__-__-_-_-_____---_-_--_______________ 32 Laccolith not related to a stock ________ Quartz diorite porphyry. ________________________ 32 Rocky Trail laccolith. ________-___-_- 73 Quartz diorite porphyry breccia._________________ 40 73 Hornblendite inclusions_-______________________ 40 Dikes 74 in IV CONTENTS Structural geology Continued Mineral resources Continued Igneous intrusions, etc. Continued Uranium-vanadium deposits Continued Faults. -------__--_-____-_____-___________ 75 Salt Wash Member, etc. Continued Dry Wash fault, ______________________ 75 Uranium-vanadium deposits Continued Mount Linnaeus fault__________________ 76 Sunshine Mining claim_____________ 97 Indian Creek fault.____________________ 76 Age of the uranium-vanadium deposits.-. 98 Joints------_-_-_--_-____-___-____________ 77 Favorable ground-________-_________--- 98 Stage of intrusion.--.----__--_---_.________ 77 Oil and gas possibilities.____________-_-_--___--. 98 Stages in the emplacement of intrusions. _____ 78 Gold and silver deposits________________________ 101 Volume of stocks and laccoliths-...__________ 79 Lode deposits in East Mountain stock_______ 101 Age of intrusions- _-_-_.-_-____--__________ 79 Lode deposits near West Mountain stock. ___. 101 Geologic history-_--_----_-----____________________ 81 Lode deposits at the margins of laccoliths..... 102 Mineral resources._________________________________ 85 Dream mine. -_-.______---_--_--__--_. 102 Uranium-vanadium deposits.____________________ 85 Dixon's mine.._-_-_____--_---___-_---. 103 Shinarump Member of the Chinle Formation.. 86 Viking mine.___________--_--_------_. 103 Moss Back Member of the Chinle Formation.. 86 Log Cabin claim_____________________ 103 Entrada Sandstone.________________________ 86 Alma mine_______________--_-_-__---. 103 Salt Wash Member of the Morrison Formation . 87 Copper deposits--_____--__--____--__--------- 103 Types of ore bodies.___________________ Copper Queen mine_.______________________ 103 Oval-shaped ore bodies.____________ Tuffy Copper mine._________.---___-_-_--. 104 Tabular ore bodies.________________ 88 Water resources. __________________________________ 104 Uranium-vanadium deposits.____________ 91 Surface water.________________________________ 104 Shay Mountain deposit...._________ 91 Ground water________________________________ 106 Harts Draw deposit..._____________ 92 Road metal______-______-__--__-___---.-_-------- 107 Lakes Claim deposit. ______________ 93 Riprap __________________________________________ 107 Shay Road deposit-________________ 96 Literature cited.__________________._-_---------_ 107 Robertson Pasture deposit..________ 96 109 ILLUSTRATIONS [Plates are in pocket] Page PLATE 1. Geologic map of the Aba jo Mountains area. 2. Shaded relief map of the Aba jo Mountains area. FIGURE 13. Types of igneous rocks exposed in Abajo 3. Triangle diagrams showing some characteristics of Mountains.. _ _-_-_-__-----------_----- 34 igneous rocks in the area. 14. Plat of normative feldspar percentages for 4. Form lines showing inferred configuration of Abajo igneous rocks of the Abajo Mountains _ 38 Mountains area shortly after emplacement of 15. Silica-variation diagram of hypabyssal rocks laccoliths. from the Abajo Mountains______-___--_- 39 5. Map of Blue Claims, Shay Mountain, Utah. 16. Major tectonic units near the Abajo Moun­ Page tains area_____-------_----------_----- 43 FIGURE 1. Index map of the Abajo Mountains area.-.. 2 17. Map showing relations of the Abajo Moun­ 2. Panoramic views of the Abajo Mountains tains to the Shay and Verdure grabens... 44 from the east and the southeast. ________ 4 18. Verdure graben as exposed on east valley 3. Deep test wells adjacent to Abajo Mountains wall of Johnson Creek__-_-----_-------- 46 area__________________________________ 10 19. Block diagrams illustrating relations of stock 4. Pinchout of members of Cutler Formation.... 12 to its satellite laccoliths____-___-_-_--_- 48 5. Measured section of the Carmel Formation__ 19 20. Index map showing inferred distribution 6. Units constituting the Carmel Formation--- 20 pattern of stocks and laccoliths.--------- 50 7. The Moab Sandstone Member of the Entrada
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