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WE8TEHM Alluvium Qoii Y Gold Mt. Tuff Mgt Mtbelknop Rhyolite [«Br

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WE8TEHM Alluvium Qoii Y Gold Mt. Tuff Mgt Mtbelknop Rhyolite [«Br GEOLOGIC COLUMN WE8TEHM EASTERN ,_^~^ -•" Formation contact Alluvium Qoii y Qal | Alluvium _. Fault -< Strike and dip of beds Sr j Sevier River formation Axis of flow folds Mt. Belknap Series Mt. Belknap Series Mar | Groy Hills rhyolite Topogaphy from Delano Peak Groy Hills gloss Quadrangle, U.S. Geological Survey Gold Mt. tuff Mgt Gray Hills arkosic ss. MtBelknop rhyolite [«br MM | Beover Hill tuff Indian Hollow tuff McTI Crescent Hill rhyolite Staley Pasture tuff [MSI Mit | Indian Hollow tuff Kimberly rhyolite JMkr Glassy dike Mkr| Klmberly rhyolite Mir j Indian Hollow rhyolite Delano Peak Series Delano Peak Series Delano Peok latite [opl Dpi 1 Delano Peak latite Bullion Canyon Series Bullion Canyon Series Tbc Bullion Canyon vofcanics (undivided) TUSHAR FAULITIE ^FLA TSOUTH GEOLOGIC MAP OF THE BEAVER CREEK AREA WEST OF MARYSVALE, UTAH MOLLOY AND KERR, PLATE 1 Geological Society of America Bulletin, volume 73 Downloaded from http://pubs.geoscienceworld.org/gsa/gsabulletin/article-pdf/73/2/211/3416898/i0016-7606-73-2-211.pdf by guest on 24 September 2021 MARTIN W. MOLLOY Texaco, Inc., P. O. Box 3247, Ventura, Calif. PAUL F. KERR Dept. Geology, Columbia University, New Yor^, N. Y. Tushar Uranium Area, Marysvale, Utah Abstract: A thick sequence of late Tertiary volcanic Thin section and clay-mineral investigations yield tuff covers portions of the Tushar Plateau in south- information about the primary structure of the central Utah. Rhyolite of similar age fills parts of volcanic units and the chemical and mineralogical the Sevier River valley to the east. Mines along reaction to alteration. Zeolites, quartz, and feldspar the valley produce uranium ore from deposits represent primary alteration features. Variations in genetically related to the tuff and rhyolite. The kaolinite, montmorillonite, and mixed-layer clay threefold relation of mountain tuff, valley rhyolite, suites reflect differences in the intensity of second- and uranium mineralization has been investigated ary alteration along fault zones. by field mapping and laboratory study of the Quartz monzonite intrusives and associated ore Mount Belknap volcanic group. bodies lie along a major east-west zone of weakness Field mapping defines changes in the volcanic which passes through Marysvale, Utah. Younger stratigraphy and shows the interfingering of the fault systems cut across this zone and define the regional tuff with the local valley rhyolites. Primary north-south axis of the Tushar Range. Uranium features of compaction, intergradation, and flow mineralization and related alteration phenomena folding suggest unusual modes of air-fall aggregation have formed fissure veins along these younger fault and subsequent gravity flow for the emplacement trends. of some of the volcanic units. CONTENTS Introduction 212 Figure Acknowledgments 212 1. Index map of the Marysvale area, Utah . 213 Rock units 214 2. Diagrammatic section of the Tushar Range . 215 Basement 214 3. Thin sections of volcanic and sedimentary rock Sedimentary sequence 214 units 216 Bullion Canyon volcanic group 214 4. Thin sections of Mount Belknap rock units. 218 Delano Peak latite 214 5. A Gray Hills rhyolite flow 220 Dry Hollow latite 215 6. Volcanic rocks from the Tushar Range . .221 Monzonitic intrusives 215 7. Air view of the crests of the Tushar Range from Delano Peak arkose 215 the south 222 Mount Belknap volcanic group 215 8. The Tushar Range from the west, above Blue Introduction 215 Lake 223 Indian Hollow rhyolite 216 9. Unconformity and Delano Peak latite at the Indian Hollow tuff 217 base of the Mount Belknap volcanic group 225 Crescent Hill rhyolite 217 10. Air view of Bullion Canyon volcanic rocks . 226 Gray Hills arkose 219 11. Range in units of the Mount Belknap volcanic Gray Hills rhyolite 219 group 227 Beaver Hill tuff 219 12. Fault pattern and monzonite intrusives in the Staley Pasture tuff 220 Marysvale area 229 Gold Mountain tuff 222 Plate Facing Mount Belknap rhyolite 222 1. Geologic map of the Beaver Creek area west of Glass in the Mount Belknap volcanic group . 222 Marysvale, Utah 211 Clear Creek tuffs 224 Following Structure 224 2. Compaction features of the Marysvale Valley Tushar Range 224 volcanic rocks Emplacement of the volcanic units 226 3, Flowage features in the Mount Belknap rhyo- Basement latites 226 lites 220 Mount Belknap volcanic group 226 4. Flow glass, dike glass, and alteration phenomena Fault patterns 228 5. Gold Mountain and Joe Lott tuff units .... Mineralization and alteration 230 Facing Alteration features 230 6. Geologic map of the Clear Creek area north of Clay mineralogy 230 Marysvale, Utah 226 Uranium mineralization 232 7. General volcanic and sedimentary features. 230 Summary and conclusions 233 8. Thrust fault along Clear Creek, and silica concre- References cited 234 tions from dikes 231 Geological Society of America Bulletin, v. 73, p. 211-236, 12 figs., 8 pis., February 1962 211 Downloaded from http://pubs.geoscienceworld.org/gsa/gsabulletin/article-pdf/73/2/211/3416898/i0016-7606-73-2-211.pdf by guest on 24 September 2021 212 MOLLOY AND KERR—TUSHAR URANIUM AREA, MARYSVALE, UTAH Creek (Fig. 1) and 25 miles to the southeast INTRODUCTION near Antimony, Utah, tuff similar to the Mount The Tushar Range of southern Utah, a mod- Belknap is found. A strip along Beaver Creek erately tilted, sedimentary block submerged by (PI. 1), from the Tushar crests to the Sevier Tertiary volcanic rocks, forms a transition be- River valley and joining the Marysvale map tween the Colorado Plateau and the Basin and published by Kerr et al. (1951) provides an op- Range provinces. portunity for continuous observation of the Since the 1860's the Tushar Range has pro- Mount Belknap units. This area includes sev- duced diverse mineral groups ranging from eral recently discovered deposits of uranium potassium to gold. In several areas a dacite host near the summit of Mount Belknap. Mine rock contains veins of gold, silver, and copper roads, bulldozed across the crests of the Tushar localized by minor tensional fractures parallel Range, afford an unusual opportunity to study to the axis of the range. Nearby, similar fissures a particularly mountainous area hitherto ac- contain large deposits of vein alunite. Where cessible only on foot or horseback. erosion has exposed the underlying Plateau In this paper the color nomenclature of the sediments, related faults cut replacement de- Rock-color Chart (Goddard, 1948) has been posits of lead, zinc, silver, mercury, and selen- followed. The designation of volcanic units as ium. tuff and rhyolite rather than ignimbrite has Late Tertiary intrusions of quartz monzonite been adopted in order to avoid a decision con- are scattered throughout the Tushar Range. cerning origin, since the method of formation Fracture zones in these intrusives have furn- and emplacement of the Mount Belknap units ished significant production of uranium in re- is controversial. cent years. X-ray spectrochemical (fluorescence) analy- This long history of mining has led to a series ses of volcanic material from the Tushar Range of geologic reports on the area, beginning with have been published (Molloy and Kerr, 1960). C. E. Dutton in 1880. More recent work by Some of the conclusions from that paper con- Eardley and Beutner (1934) has reviewed the cerning stratigraphic correlation and alteration geomorphology, and Callaghan (1939) has de- phenomena are incorporated in this report. scribed the volcanic sequence in general terms. In 1951 the Division of Raw Materials of the ACKNOWLEDGMENTS U. S. Atomic Energy Commission sponsored a This study has been supported by the U. S. joint study with Columbia University on the Atomic Energy Commission, Divisions of Re- uranium mineralization near Marysvale, Utah. search and Raw Materials; a graduate fellow- The field work and laboratory study of this ship of the Union Carbide Ore Company, project (Kerr, Brophy, Dahl, Green, and division of Union Carbide Corporation; and re- Woolard, 1957) and a subsidiary report (Bethke search grants from the Department of Geology, and Kerr, 1954) investigated the sedimentary Columbia University. The co-operation of basement, volcanic units, and alteration phe- Messrs. Ben Bowyer of the Atomic Energy nomena accompanying mineralization in the Commission and Bertram L. Myerson is grate- Sevier River Valley. The relation between fully acknowledged. Mr. Allen Taylor of Phil- glassy dikes and uranium ore in the Marysvale lips 66 Petroleum Company has aided in dis- mines led to the present investigation of the cussing the field relations of the Mount Belknap Mount Belknap volcanic rocks. volcanic rocks. Mr. Frank Nallick has been The Mount Belknap volcanic group consists particularly helpful with his knowledge of of extensive deposits of tuff with local rhyolite uranium prospects in the Tushar Range and covering the crests of the Tushar Range and Mr. LeRoy Kmetzsch has kindly provided sequences of rhyolite with local tuff filling por- similar information on the Clear Creek area. tions of the Sevier River valley on the eastern The authors are indebted to Mr. Charles Steen side of the range. Glass flows are found at sev- of Utex Mining Company and Mr. Loren eral levels in the valley and glassy dikes, similar Atherlee for providing aircraft for aerial re- to those in the uranium mines, transect tuff and connaissance of the Tushar Range. rhyolite in the mountain and the valley vol- The many courtesies of the people in Marys- canic units. Uranium deposits are also found vale during the 2 field seasons are deeply ap- among the highest peaks of the range in tuff of preciated. Special thanks are extended to Mrs. Mount Belknap age. Bernice Palmer and Messrs. Harvey Gibbs, Fifteen miles to the northwest along Clear Max Parker, and Richard Ward. During both Downloaded from http://pubs.geoscienceworld.org/gsa/gsabulletin/article-pdf/73/2/211/3416898/i0016-7606-73-2-211.pdf by guest on 24 September 2021 ACKNOWLEDGMENTS 213 >-' = ar reacreev' ail yV Xl5 f l; I / ( bJf,MJM/JMtM/S///MS/A',;?,js/jsjs/j///ss///s////j/js,:'•m 1 -,.- ^ V^ ^-^^ / L;—^.-!-;:1^ 1 \^ SEVIER CO.
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