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Igneous Rocks and Related Mineral Deposits of the Barker Quadrangle, Little Belt Mountains,

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Igneous Rocks and Related Mineral Deposits of the Barker Quadrangle, Little Belt Mountains, CONTACT INFORMATION Mining Records Curator Arizona Geological Survey 416 W. Congress St., Suite 100 Tucson, Arizona 85701 602-771-1601 http://www.azgs.az.gov [email protected] The following file is part of the Grover Heinrichs Mining Collection ACCESS STATEMENT These digitized collections are accessible for purposes of education and research. We have indicated what we know about copyright and rights of privacy, publicity, or trademark. Due to the nature of archival collections, we are not always able to identify this information. We are eager to hear from any rights owners, so that we may obtain accurate information. Upon request, we will remove material from public view while we address a rights issue. CONSTRAINTS STATEMENT The Arizona Geological Survey does not claim to control all rights for all materials in its collection. These rights include, but are not limited to: copyright, privacy rights, and cultural protection rights. The User hereby assumes all responsibility for obtaining any rights to use the material in excess of “fair use.” The Survey makes no intellectual property claims to the products created by individual authors in the manuscript collections, except when the author deeded those rights to the Survey or when those authors were employed by the State of Arizona and created intellectual products as a function of their official duties. The Survey does maintain property rights to the physical and digital representations of the works. QUALITY STATEMENT The Arizona Geological Survey is not responsible for the accuracy of the records, information, or opinions that may be contained in the files. The Survey collects, catalogs, and archives data on mineral properties regardless of its views of the veracity or accuracy of those data. Igneous Rocks and Related Mineral Deposits of the Barker Quadrangle, Little Belt Mountains, .. Montana By IRVING J. WITKIND GEOLOGICAL SURVEY PROFESSIONAL PAPER 752 A laccolithic complex in central Montana is examined in detail with special attention given to the igneous rocks) the intrusions) and the related silver-lead-zinc deposits UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON 1973 UNITED STATES DEPARTMENT OF THE INTERIOR ROGERS C. B. MORTON, Secretary GEOLOGICAL SURVEY V. E. McKelvey, Director Library of Congress catalog-card No. 72-600361 For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402 Price: Paper cover.-U-OO..dc>maa~~re- Stock No. 2401-00312 /.5S- 58 IGNEOUS ROCKS AND RELATED MINERAL DEPOSITS OF THE BARKER QUADRANGLE, MONTANA rangle, Montana: U.S. Geol. Survey Geol. Atlas, Folio in the northern part of the Barker quadrangle, Little 55, 9 p., 4 maps. Belt Mountains, Montana, in Geological Survey research --- 1899b, Description of the Little Belt Mountains quad­ 1965; U.S. Geol. Survey Prof. Paper 525- C, p. C20-C24. rangle, Montana: U.S. Geol. Survey Geol. Atlas, Folio --- 1969, C1inopyroxenes from acidic, intermediate, and 56, 11 p., 4 maps. basic rocks, Little Belt Mountains, Montana: Am. - - - 1899c, Laccoliths and bysmaliths [abs.]: Science, new Mineralogist, v. 54, nos. 7-8, p. 1118-1138. ser., v. 10, p. 25- 26. --- 1970, Composite dikes in the Little Belt Mountains, CONTENTS - -- 1900, Geology of the Little Belt Mountains, Montana, central Montana, in Geological Survey research 1970: with notes on the mineral deposits of the Neihart, U.S. Geol. Survey Prof. Paper 700- C, p. C82-C88. Barker, Yogo, and other districts; accompanied by a --- 1971, Geologic map of the Barker quadrangle, Judith Page Page report on the petrography of the igneous rocks of the Basin and Cascade counties, Montana: U.S. Geol. Survey Abstract _____ ____ ___ ___ ___ ___ ___ ___ ____ ____ ___ __ _ 1 The intrusions-Continued district, by L. V. Pirsson: U.S. Geol. Survey 20th Ann. Geol. Quad. Map GQ- 898. Introduction __ __ _______ _______ ______ ____ __ ______ _ 2 Descriptions of laccoliths- Continued Rept. (1898- 99), pt. 3, p 257-581. Witkind, I. J., Kleinkopf, M. D., and Keefer, W. R., 1970, Previous and present work ___ __________ ___ ______ _ 3 Planoconvex laccoliths-Continued Westgate, L. G., 1920, Deposits of iron ore near Stanford, Geologic and gravity evidence for a buried pluton, Little Acknowledgments __ ___ ___ _____________ ___ ___ __ __ _ 3 Taylor Mountain laccolith ______ __ ____ _ 31 Montana : U.S. Geol. Survey Bull. 715-F, p. 85-92 Belt Mountains, central Montana, in Geological Survey Geographic and geologic setting ___ ___ ____ ____ ____ _ 3 Laccolith (?) underlying the Limestone [1921] . research 1970: U.S. Geol. Survey Prof. Paper 700-B, p. Igneous rocks ___________ __ ___ ______ _____________ _ 5 Butte dome _____ ___ ___ ___ ____ ___ __ _ 31 Witkind, I. J., 1964, Geology of the Abajo Mountains area, B63- B65. Felsic rocks ___ ___ ___ __ ________ __ ______ ___ ___ _ 5 Dry Wolf laccolith ___ ____ ______ ______ _ 31 San Juan County, Utah: U.S. Geol. Survey Prof. Paper Woodward, G. E., and Luff, Paul, 1945, Gold, silver, copper, Old felsic rocks ___ ___________ _______ ____ _ 5 SatelIitic laccoliths ___ ______ _________ ___ _ 31 453, 110 p. lead, and zinc in Montana, in Minerals yearbook, 1943: Porphyry of Clendennin Mountain ___ __ _ 5 Clendennin-Peterson laccolith _____ __ __ _ 31 --- 1965, Relation of laccolithic intrusion to faulting U.S. Bur. Mines, p. 381-407. Wolf Porphyry ___ ___ _____ ___ ___ ___ _ 9 Clendennin fault ________ ___ __ ___ _ 32 Young felsic rocks ____ ___ __ ___________ ___ _ 9 Peterson fault ___ _____ __ ___ _____ _ 32 Rhyolite of Granite Mountain ____ ___ __ _ 9 Otter laccolith __ ___ ___ ___ ___ ____ ____ _ _ 33 Porphyry of Galena Creek ___ ____ ____ _ 9 Asymmetric laccoliths _____ _______________ _ 33 Snow Creek ( ?) Porphyry __ _______ ___ _ 9 Barker laccolith ___ _____ ____ ____ __ ___ _ 33 Chemistry of the felsic rocks ___ ___ __ ___ __ _ 11 Mixes Baldy-Anderson Peak laccolith __ 34 Intermediate rocks ___ _________ _______ __ ____ _ _ 11 Bysmalith ____ ____ ___ ___ __ ___ __ __ ______ _____ _ 35 Quartz monzonite of Hughesville ___ ___ _ 11 Granite Mountain bysmalith ___ ___ _____ ___ _ 35 Barker Porphyry ___ ____ __ ____ __ __ ___ _ 16 Buried pluton ______ __ _______________ _______ _ 36 Chemistry of the intermediate rocks ___ __ __ _ 16 Indurated alluvium ______ __ __ _____ ____ ______ _ _ 37 Mafic rocks ____ _____ ____________ ____ ___ ____ _ _ 16 Emplacement sequence of the intrusions _____ ___ _ 41 Shonkinite ___ ___ ____ ____ _____________ ___ _ 19 First intrusive episode ___ ________ ____ ___ _ 42 Plagioclase shonkinite ______ ______ ______ _ _ 19 Second intrusive episode ___ ______ __ ______ _ 42 Syenite ___ ____ ___________ __ _____ __ ___ ___ _ 19 Formation of indurated alluvium __ ____ __ __ _ 42 Minette-kersantite _________ _____ __ ___ ____ _ 19 Third intrusive episode _____ ______ _____ ___ _ 42 Vogesite ___ ______ _____________ ___ ___ ____ _ 21 Radiometric ages of the intrusions ____ ______ ___ _ 42 Chemistry of the mafic rocks ______ __ __ __ __ _ 23 Mineral deposits ______ __ __ ____ _____ __ __ __ ___ ___ _ _ 43 Composite dikes __ _________ ____________ ______ _ 24 Barker mining district __ __ ______________ _____ _ 43 Similarities of clinopyroxenes ____ __ _______ __ _ 24 Fissure veins in the stock __ __ ____________ _ 45 The intrusions _____ ___ ______ __ _____ __ __ __ ___ ____ _ 24 Fissure veins beyond the stock ______ ___ _ _ 49 Stock __ _______ ___ __ ______ ________ ___ ___ _____ _ 25 Contact-replacement deposits ___ _____ ______ _ 50 25 Tenor ___ __________ ____ _______ ____ ____ __ _ Hughesville stock __ _______ _______ _______ _ 50 Laccoliths ____ ___ ____ __ _________ ______ ___ ___ _ 27 Age of the ores __ ____ _____ ___ ____ ___ __ __ _ 51 Planoconvex laccoliths __ _ . __ __ . __ ______ __ _ 28 Localization ___ ___ ____ __________ __ ______ _ _ 52 Tongue-shaped satellitic laccoliths ____ _____ _ 28 San Miguel district ____ ______ ___ _____ _______ _ 52 Asymmetric laccoliths _________ ________ _ _ 28 Ore potential __ __ _____ ___ ___ __ ___ _____ ___ __ __ _ 54 28 Sulfide veins __ ___ ______________ __ ____ ___ _ Descriptions of laccoliths ___ ______ __ ___ ______ _ 54 Planoconvex laccoliths ___ ____ ____ ___ _____ _ 28 Buried mineralized pluton ___ ______ __ _____ _ 56 Butcherknife Mountain laccolith ______ _ 28 References cited __ __ _________ _____ ___ __ ___ ___ ____ _ 57 ILLUSTRATIONS Page FIGURE 1. Index map of part of Montana and the study area __ __________ ______ ____ __ ____ ________ __ ____ __ ___ _ 2 2. Map showing pattern of intrusions in the Barker quadrangle ______ ___ ____ _____ __ ____ __ __ _____ ____ 4 3. Generalized section of sedimentary rocks exposed in the Barker quadrangle ____ ____ ___ ___ _________ 8 4. Photographs of the felsic igneous rocks ___ _________ _______ ___ _____ ___ ____ __ __ __ ___ ______ ____ __ __ __ 10 5. Triangular diagram showing some chemical char acteristics of old and young felsic rocks .___ _____ ______ 11 6. Geologic map of the Hughesville stock and adjacent intrusions ______ __ ____ ________ _____ ______ ______ 14 7. Photographs of the intermediate and mafic igneous rocks ____ _______ ___ ___ ____ __ _____ ___ __ ___ ____ ___ 17 8. Silica variation diagrams for intermediate rocks from intrusions in the Barker quadrangle ____ _____ __ 18 III U.S.
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