 | | Report (issue) | | Geochemical, and Isotopic Data for the Boulder Batholith, Southwest Montana Professional Paper 1793 U.S. Department...Pass, Montana. Synthesis of Petrographic, Geochemical, and Isotopic Data for the Boulder Batholith, Southwest...Southwest Montana By Edward A. du Bray, John N. Aleinikoff, and Karen Lund Professional Paper 1793 U...geochemical, and isotopic data for the Boulder batholith, southwest Montana: U.S. Geological Survey Professional...8. 9. 10. Index map showing location of Boulder batholith relative to major geologic features in the |  | | Journal (article/letter/editorial) | | andStrontiumIsotopeStudiesof the BoulderBatholith, Southwestern Montana B. R. DOE, R. I. TILLING, C. E. HEDGE,AND M. R...osition,the fact that Pb2ø•/Pb2ø4for the Butte Quartz Monzonite varies by 1.3 percent,comparedto a range...range of about 8.6 percentfor the batholith as a whole, suggeststhat perfect isotopicmixing of the magma...isotopicallyvery similar to feldsparleadsof the host Butte Quartz Monzonite. This isotopicsimilarity was interpretedby...not occurin the Butte Quartz Monzonite nor in any other pluton of the batholith, and that the isotopic |  | | Journal (article/letter/editorial) | | 8022S Nature of the Boulder Batholith of Montana ABSTRACT The Boulder batholith formed as a thin and...it. Eastward, the volcanic overflow from the batholith lies upon prebatholithic sedimentary rocks and...eastward over them. The westernmost part of the batholith, by contrast, is roofed by prebatholithic sedimentary...of the batholith, which lies atop the downtilted stratigraphic piles. The ends of the batholith are scalloped...anticlinal horns between the cusps flatteri into the batholith, and the floors of the cusps presumably flatten |  | | Journal (article/letter/editorial) | | Syncompressional Emplacement of the Boulder and Tobacco Root Batholiths (Montana-USA) by Pull-apart along Old Fault...plutons comprising the 6000 km' Late Cretaceous Boulder batholith were emplaced at mid- to upper-crustal levels...the Montana thrust belt. The Tobacco Root batholith, the largest satellite pluton of the Boulder batholith...margin of the thrust belt. Emplacement of the Boulder batholith and its satellite plutons was controlled principally...controlled the emplacement of the main mass of the batholith (Butte pluton). A third (NW-trending) fault set |  | | Journal (article/letter/editorial) | | State of Alkali Feldspar within the Rader Creek Pluton, Boulder Batholith, Montana1 by ROBERT I. TILLING U...petrographic and mineralogic study of the Boulder batholith, a wide range of variation in microscopic...feldspars of the Rader Creek pluton. Whereas all the other major plutons of the batholith contain essentially...orthoclase2 as the sole alkali feldspar, the Rader Creek pluton contains, in addition to orthoclase, grid-twinned...the alkali feldspar is more variable in the Rader Creek pluton than in the other plutons. Subsequent |  | Lund, K., Aleinikoff, J. N., Kunk, M. J., Unruh, D. M., Zeihen, G. D., Hodges, W. C., du Bray, E. A., O'Neill, J. M. (2002) SHRIMP U-Pb and 40Ar/39Ar Age Constraints for Relating Plutonism and Mineralization in the Boulder Batholith Region, Montana. Economic Geology, 97 (2) 241-267 doi:10.2113/gsecongeo.97.2.241 | Journal (article/letter/editorial) | | Plutonism and Mineralization in the Boulder Batholith Region, Montana KAREN LUND,†U.S. Geological Survey...Denver, CO 80225 GREGORY D. ZEIHEN, Montana Resources, Butte, Montana 59701 WENDY C. HODGES, U.S. Geological...Denver, CO 80225 Abstract The composite Boulder batholith, Montana, hosts a variety of mineral deposit types...silver-rich polymetallic quartz vein districts in the northern part of the batholith and the giant Butte porphyry...Stage vein system in the southern part of the batholith. Previous dating studies have identified ambiguous |  | | Report (issue) | | Potassium in Igneous Rocks of the Boulder Batholith Region, Montana, and Its Bearing on Radiogenic Heat...Potassium in Igneous Rocks of the Boulder Batholith Region, Montana, and Its Bearing on Radiogenic Heat...rocks of the Boulder batholith region _ _ Prebatholith volcanic rocks______ _ Batholith rocks________...the Boulder batholith region_______________ 2. Generalized geolgic map of the Boulder batholith and ...the Boulder batholith region____________________________________ 4. Rocks of the Boulder batholith-__ |  | | Journal (article/letter/editorial) | | Origins of Water in the Boulder Batholith and the Butte Ore Deposits,Montana* SIMONM. F. SI•EPP^m) Arm...feldspars,granophyric textures,and disequilibrium quartz-K-feldspar oxygenisotopefractionations. Theserocksmustall...Butte ore deposits,and the Late CretaceousBoulder batholith as well, appear to be Postbetholith rocks ,:::•QPrincipol...role of primary magmaticand meteoric hydrothermal Boulder betholith plutons ß Biotite fluids during the evolutionof...western FiG. 1. Generalizedgeologicalmap of the Boulder bathoMontana-Idaho-easternWashington region during |  | | Journal (article/letter/editorial) | | Plutonic and Associated Volcanic Rocks, Boulder Batholith Region, Montana ROBERT I. TILLING U.S. Geological...areally weighted bulk compositions for the Boulder batholith and p r e b a t h o l i t h volcanic rocks...among themselves, as well as from many of the batholith units. Most sampled volcanic rocks are chemically...rocks, which form about 15 percent of the exposed batholith, apparently have no compositionally similar counterparts...composition. The Butte Quartz Monzonite, which makes up about three-quarters of the batholith in terms of individual |  | | Journal (article/letter/editorial) | | Amethyst Mine RUSS HAGE 701 Lolo Street Missoula, Montana 59802 dukbstr@aol.com MICHAEL A. MENZIES Unit...Alberta Canada T3B 4T7 mmenzies@shaw.ca Jefferson County, Montana P erched high on the south-facing side...steep ridge just east of the continental divide in Montana is the Little Gem amethyst mine. It is an imposing...the southern boundary of the Boulder Batholith in southwestern Montana. Map prepared by William Besse...southern extremity of the well-mineralized Boulder Batholith where those prospectors were seeking mineable |  | | Journal (article/letter/editorial) | | (including Southern California, Sierra Nevada, Boulder, and Boulder Creek batholiths and the Jemez Mountains volcanics)...from the Southern California, Sierra Nevada, Boulder (Montana) THE * Publication authorized hy the Director...GREENLAND, DAVID GOTTFRIEDand ROBERTI. TILLING and Boulder Creek (Colorado) batholiths. For comparison, biotite-hornblende...99 per cent or better. Small amounts of adhered quartz and/or feldspar constituted the predominant impurity...of a hornblende from the Southern California batholith. The precision of the analyses, expressed as relative |  | | Report (issue) | | Land Stewardship—Headwaters Province, Idaho and Montana Circular 1305 U.S. Department of the Interior...Land Stewardship—Headwaters Province, Idaho and Montana By U.S. Geological Survey Headwaters Province...land stewardship—Headwaters province, Idaho and Montana: U.S. Geological Survey Circular 1305, 92 p. Cover...Cover photographs. Front upper: Color Creek falls, tributary to Middle Fork Salmon River. Flowing across.... Geochronology and Geochemistry of the Idaho-Montana Porphyry Belt, by Cliff D. Taylor, Jeffrey A. Winick |  | | Journal (article/letter/editorial) | | an individual magmatic complex such as the Boulder batholith, and by at least one isotope ratio that is...to include all rock chemical compositions from quartz diorite through potassic or sodic granite and their...area Santa Lucia Mountains Southern California batholith Salton Sea Locality Material and filament material*...Vitrophyre, Willow Creek Member, Bachelor Mountain Rhyolite (Re 1) Welded tuff, flow, Fisher Quartz Latite (Re...Silver City Jcmcz Mountains Elkhorn Mountains Boulder batholiih Locality 30 29 28 27 26 25 24 |  | | Book | | Montana Hodges Robert Feldman Shaded relief indicates terrain and slope. Second Edition Rockhounding...longitude numbers and grid ticks are GPS compatible. Montana Enhanced detail shows more symbols, labels, and...history Cover photos of Montana agate (front) and ammonite imprint (back) © Montana Hodges Cover design by...imprint of The Globe Pequot Press MONTANA Search for stunning Montana agate along the Yellowstone River...paleontologists excavate dinosaurs in Malta. Rockhounding Montana points the way to the best rockhounding in the |  | | Journal (article/letter/editorial) | | CLINOCHLORE FROM THE SILVER STAR DISTRICT, MADISON COUNTY, MONTANA Key Words-Chemical analysis, Chlorite, Clinochlore...Golden Antler mine, about 40 km southeast of Butte, Montana, in the Silver Star district, a district where...mine is in the SWIJ4 sec. 14, T2S, R6W, in Madison County and is leased by Cyprus Industrial Minerals Company...to the northeast. The Rader Creek pluton of the Cretaceous-age Boulder batholith has intruded the Paleozoic...pluton, also considered to be part of the Boulder batholith, has intruded the Archean metamorphic rocks |  | | Journal (article/letter/editorial) | | oligoclaseand has a specificgravity similar to that of quartz. For each specimen the kind and amount of admixed...techniques used to obtain the separate with the least quartz. The possible effect of this mineral purification...(separated by the fluorboric acid method) from the Boulder batholith as 0.20 and 0.13 ppm. We have augmented their...their analyseswith two addition al quartz samples(concentratedby specificgravity separations only). Sample...but the slightly cloudy, grayish appearanceof the quartz perhapsreflects the presenceof submicroscopicimpurities |  | | Journal (article/letter/editorial) | | and Composition of Sulfide Minerals, Boulder Batholith, Montana A. H. Brownlow and S. L. Kurz Department...Boston, Massachusetts 02215, USA Sulfide minerals in the Boulder batholith occur i. as disseminated grains...cent for unaltered rocks. Unaltered rock of the batholith may contain as much as 0.7 weight per cent sulfide...inclusions in pyrite, the most abundant sulfide of the batholith, are common and represent a captured iss-phase...Electron-probe analyses show that pyrites of the Boulder batholith have very similar compositions to those found |  | | Report (issue) | | HIGHLAND MOUNTAINS SILVER BOW AND MADISON COUNTIES, MONTANA By David R. Zimbelman, Byron R. Berger, and Wendy...Highland Mountains Silver Bow and Madison Counties, Montana————————————————————— 2. Generalized geologic...Highland Mountains Silver Bow and Madison Counties, Montana——————————— 4. 3 7 Rock sample sites, Highland...Highland Mountains Silver Bow and Madison Counties, Montana————————————————————— 8 5. Graphical depiction...Highland Mountains, Silver Bow and Madison Counties, Montana (fig.1), have been the site of frequent mining |  | | Report (issue) | | norms of an "homogeneous" pluton of the Boulder batholith, Montana, by R. I. Tilling________ Mafic lavas...Geochronology Radiometric ages of zircon and biotite in quartz diorite, Eights Coast, Antarctica, by A. A. Drake...and its use in ground-water studies in Niagara County, N.Y., by F. W. Trainer andJ. E. EddY---------...NORMS OF AN "HOMOGENEOUS" PLUTON OF THE BOULDER BATHOLITH, MONTANA By ROBERT I. TILLING, Washington, ...granodiorite of Rader Creek is one of the most homogeneous-appearing plutons in the composite Boulder batholith |  | | Report (issue) | | MINERALOGICAL VARIATION IN THE PIONEER BATHOLITH, SOUTHWEST MONTANA by Uane Marie Hammarstrom Open-File... 1 Previous work 3 Geology of the Pioneer Batholith 7 Field relations 10 Age 11 - Strontium...Modal analyses 13 Petrography 18 Cretaceous quartz diorite 18 Cretaceous tonal ites 21 Cretaceous... Introduction The Pioneer Batholith is a Late Cretaceous to Pal eocene composite batholith located in the Pioneer...Pioneer Mountains of southwestern Montana. Interest in this batholith stems from its proximity and gross |  | | Report (issue) | | the Basin and Boulder Mining Districts, Boulder River Watershed, Jefferson County, Montana Professional...Eva May mine looking across Cataract Creek valley at Hoodoo Creek drainage. Photograph by D.A. Nimick...the Basin and Boulder Mining Districts, Boulder River Watershed, Jefferson County, Montana Edited by David...historical mining in the Boulder River watershed, Jefferson County, Montana............................Geological Survey The Boulder River watershed study, Jefferson County, Montana ..................... |  | | Report (volume) | | Belt Supergroup, Highland Mountains, Southwestern Montana U.S. GEOLOGICAL SURVEY BULLETIN 2121-A AVAILABILITY...Belt Supergroup, Highland Mountains, Southwestern Montana By J. Michael O'Neill BELT SUPERGROUP IN THE HIGHLAND...THE PIONEER AND ANACONDA RANGES, SOUTHWESTERN MONTANA J. Michael O'Neill and Robert C. Pearson, Editors...Belt Supergroup, Highland Mountains, southwestern Montana / by J. Michael O'Neill. p. cm. (U.S. Geological...the Pioneer and Anaconda ranges, southwestern Montana; A) Includes bibliographical references. Supt. |  | | Report (issue) | | Northern Elkhorn Mountains I I Jefferson and Broadwater Counties, Montana GEOLOGICAt ' SURVEY PROFESSIONAL...Northern Ell(horn Mountains Jefferson. and Broadwater CountieS, Montana By HARRY w. SMEDES GEOLOGICAL..._______________ _ Ash-flow tuff __________________________ _ Quartz latite ash flows ______________ _ Rhyolite ash...Casey Peak mass ______________________ _ Moose Creek mass _____________________ _ South Fork mass __...Tertiary System ______________________ _ Boulder batholith ______________________________ _ Early mafic |  | | Journal (issue) | | the Bald Mountain Skarn, Pipestone Pass Area, Montana.. ........... 18 by Robert L. Reuss Famous Mineral...Brian Mason An Occurrence of Multiple Japan-Law Quartz Twins .................................. 34 by...and Mexican min erals, including ·boleite from Montana, coppers from Arizona and New Mexico, and others...great pleasure 1hat I learned 1ha1 1he Frederick County Rock . and Mineral Club produces a bulletin which...crystal 24 by l l mm) from the Thomas Mountains, Juab County, Utah, Al though collecting is tedious. this lo |  | | Journal (article/letter/editorial) | | perthites from the Precambrian Enchanted Rock batholith, central Texas, U.S.A., were investigated b y...perthites in the Enchanted Rock batholith and its associated dike rocks. The batholith is Precambrian in age and...include leucogranites to granodiorites within the batholith, a~ well as associated pegmatites and aplites...emplacement of the batholith. Determinative procedures Samples from the batholith were collected primarily...in Table 2. The (200)and (112) refections for ~t-quartz were used respectively as internal standards for |
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