 | | Report (issue) | | NOTES ON THE MINERAL DEPOSITS OF THE BEARPAW MOUNTAINS, MONTANA. By LEON J. PEPPERBERG. INTRODUCTION...an investigation of the Milk River coal field, Montana, during the field season of 1909, the writer had...number of mineral prospects located in the Bearpaw Mountains. The following notes are the result of this...specimens collected. Their studies show the Bearpaw Mountains to be rich in rocks of unusual types and of...White in 1882 from the southern foothills of the mountains, in the vicinity of Eagle Creek. Some of the sedimentary |  | | Report (volume) | | of the Rattlesnake Quadrangle Bearpaw Mountains Blaine County, Montana By B. C. HEARN, JR., W. T. PECORA...central arch and southern volcanic field of the Bearpaw Mountains and surrounding plains UNITED STATES GOVERNMENT...Telegraph Creek Member_-___-__-_---___-__-_-_________ Montana Group_---___--___-_-__----__---__---_---_-___-__...Formation..-_____________________________ 17 Bearpaw Shale___--_--_-_-_-----_-_-_-_-_-_-__--_____- ..._______________________________________________ Bearpaw Mountains structural arch__________--______-__-________ |  | | Journal (article/letter/editorial) | | GLACIOLACUSTRINE DEPOSITS OF THE KEEWATIN GLACIER IN MONTANA Downloaded from gsabulletin.gsapubs.org on August................. 919 2. Map of Bearpaw Mountains, Little Rocky Mountains, and surrounding terri tory,...KNECHTEL----SNAKE BUTTE BOULDER TRAIN, NORTH-CENTRAL MONTANA ABSTRACT Glacial striae on shonkinite exposures...prominent intrusive in the plains south of Harlem, Montana, trend southeastward. A train of shonkinite boulders...as it piled against the north side of the Bearpaw Mountains, developing a downward gradient toward the |  | | Report (volume) | | Petrology of the Eagle Sandstone, Bearpaw Mountains Area, North-Central Montana By DONALD L. GAUTIER INVESTIGATIONS...Petrology of the Eagle Sandstone, Bearpaw Mountains area, north-central Montana. (Investigations of shallow...Sandstone-Montana-Bearpaw Mountains region. 2. Gas, Natural-GeologyMontana-Bearpaw Mountains region. I...52 ILLUSTRATIONS Page FIGURE 1. Index map of Bearpaw ~ountains study area, ~ontana, showing wellcore...descriptions of sampled cores from the Bearpaw Mountains area, Montana 2. Clay mineral data for selected samples |  | | Journal (article/letter/editorial) | | PEGMATITES OF E. WM. MONTANA. âą HEINRICH. CONTENTS. PAGE Abstract .......................................................................... Montana pegmatite..................................................................................... Bearpaw pegmatites................................................ .. 332 332 333 334 334 ABSTRACT. Montana pegrnatitesare oĆthree main age groups: pre-Beltian...stocksand Published bypermission oftheDirector, Montana Bureau ofMines andGeology. 307 308 E. WM. HEINRICH |  | | Journal (article/letter/editorial) | | intermediate between orthoclase and sanidine, and is preserved only in the orthoclase crystal cores. Minor...Analyst P. Povondra. 4 = Sodalite phonolite, KlĂnovec Hill. Analyst P. Povondra. 5 = Orendite, leucocratic...phonolite (3) from Louâ cnĂĄ and phonolite from KlĂnovec Hill (4). No. 2 3 4 Cs (ppm) Rb Sr Ba Ga* As* Sc...from pseudoleucites, (e.g. in the Highwood Mts., Montana; Larsen & Buie 1938), such relicts have not been...1968) of the K-feldspar varies between that of orthoclase and sanidine (cf. Pivec & Ulrych 1982). The difference |  | | Journal (article/letter/editorial) | | The dyke cluster occurs to the east of Phenai Mata hill in which are exposed basalt, gabbro, granophyre...microscopeis a coarseintergrowth (Fig. 2) of orthoclase and nepheline with small amounts of cancrinite...Pseudoleucite showing coarse intergrowth of nepheline and orthoclase; and peg structure in nepheline with rods of...cancrinite, with stray tiny rectangular crystals of orthoclase (2V*:57o). The mafics in the rock are representedb1'...Mineralogically the Ghori pseudoleuciteand the Bearpaw variety (Zies and Chayes, 1960) are almost identical |  | | Journal (article/letter/editorial) | | 354 The orthoclase-microcline inversion. By WM. SCOTTMAcKENzIE, M.A., B.Sc., Ph.D. Geophysical Laboratory...January, 1954.] INTRODUCTION. HE association of orthoclase 1 and microcline in the same rock has been commented...in explaining the relationship of adutaria to orthoclase and microcline have been encountered. The identification...In one of the specimens to be described here, orthoclase is actually present along with microcline, and...hypothesis to untwinned microclines. 1 The term orthoclase is used throughout this paper to indicate low-temperature |  | | Journal (article/letter/editorial) | | alkaline pegmatites from Gordon Butte, Crazy Mountains (Montana, USA): comparisons between potassic and sodic...Springer-Verlag 2002 Abstract At Gordon Butte (Crazy Mountains, Montana), agpaitic nepheline±syenite pegmatites intrude...Alkaline igneous rocks of central and western Montana (USA) exhibit great petrographic diversity, and are...Alkaline parageneses of diÂerent provenance from Montana have been shown to contain a variety of rare minerals...igneous lithologies of the Crazy Mountains area (south-central Montana), which include a sub-alkaline series |  | | Journal (article/letter/editorial) | | frequently in common pegmatite with microcline and orthoclase as the chief feldspars present. SPESSARTITE,...Lode pegmatite near the Royal Gorge in Fremont County, Colorado. Common in the pegmatites of Yavapai...the Ben Nevis Mine on San Augustin Peak, Organ Mountains, New Mexico; in Connecticut, and Pennsylvania;...Mountain in the Crested Butte region of Gunnison County, Colorado, in good gem crystals. ANDRADITE, calcium-iron...Andradite has been found at Middletown, Delaware County, Pennsylvania and at other localities in Delaware |  | | Journal (article/letter/editorial) | | Montana Mineral Locality Index Downloaded by [University of Nebraska, Lincoln] at 20:00 09 April 2015...2015 K NOWN AS THE TREASURE STATE, Montana is rich in mineral and gemstone localities. The state motto...The middle third of the state is known as the Montana alkali province where the sediments have MICHAEL...Indian Queen mine ca. 1905 at Farlin, Beaverhead County. 208 ROCKS & MINERALS Downloaded by [University... the Rocky Mountains, and furthest to the northwest, the belt basin. The Rocky Mountains contain sedimentary |  | | Journal (article/letter/editorial) | | indicated on the accompanying map, figure 1, of Clinton county, New York, which shows them all with the exception...dike at Burke, Franklin county. They occur in greatest abundance on Rand hill, in Beekmantown and Altona...Altona town ships. The hill is an outlier of pre-Cambrian rocks projecting above the * K em p and M a r...feet on F i g u r e 1 . âSketch Map of Clinton County, New York. Showing by heavy black line the Potsdam-pre-Cambrian...within a radius of less than 20 miles from Rand hill, the one at Burke alone excepted. The latter is |  | Thakurdin, Yashirvad, Bolhar, Robert, HorvĂĄth, PĂ©ter, Rocholl, Alexander, Collerson, Kenneth (2019) Characterization of crustal xenoliths from the Bearpaw Mountains, Montana (USA), using U-Pb geochronology, whole-rock geochemistry and thermobarometry, with implications for lower crustal processes and evolution of the Wyoming Craton. Chemical Geology, 524. 295-322 doi:10.1016/j.chemgeo.2019.05.034 | Journal (article/letter/editorial) | | Characterization of crustal xenoliths from the Bearpaw Mountains, Montana (USA), using U-Pb geochronology, wholerock...Characterization of crustal xenoliths from the Bearpaw Mountains, Montana (USA), using U-Pb geochronology, whole-rock...the journal pertain. PT ACCEPTED MANUSCRIPT (USA), using U-Pb Geochronology, RI Characterization...Characterization of Crustal Xenoliths from the Bearpaw Mountains, Montana Whole-Rock Geochemistry and SC Thermobarometry...State University, Baton Rouge, Louisiana 70803, USA 5 6 Deutsches GeoForschungsZentrum GFZ, 14473 Potsdam |  | MACDONALD, R., UPTON, B. G. J., COLLERSON, K. D., HEARN, B. C. H., JAMES, D. (1992) Potassic Mafic Lavas of the Bearpaw Mountains, Montana: Mineralogy, Chemistry, and Origin. Journal of Petrology, 33 (2) 305-346 doi:10.1093/petrology/33.2.305 | Journal (article/letter/editorial) | | 0022-3530/92 $3.00 Potassic Mafic Lavas of the Bearpaw Mountains, Montana: Mineralogy, Chemistry, and Origin by...ABSTRACT The volcanic rocks of the Bearpaw Mountains are part of the Montana high-potassium province, emplaced...lithosphere keel. Structure The Bearpaw Mountains of north-central Montana (Fig. 1) form a drcular feature...varieties. The Eocene volcanic rocks of the Bearpaw Mountains, Montana, provide an excellent opportunity to...associated latites. POTASSIC MAFIC LAVAS OF THE BEARPAW MOUNTAINS 111° 110° CANADA 30? 109° 108° SWEETGRASS |  | | Report (issue) | | BUTTE INTRUSIVES GARFIELD COUNTY, MONTANA 0 ROBERT E. MATSON B.A. Montana State University, Presented...requirements for the degree of Master of Science MONTANA STATE UNIVERSITY I960 ÂŁ&-<& Approved by: This...List of Figures Figure 1. Sketch map of Central Montana ............ 3 Figure 2. Figure 3. Structure...PETROLOGY OF SMOKY BUTTE INTRUSIVES GARFIELD COUNTY, MONTANA Abstract The Smoky Butte intrusives are located...Garfield County, Montana on the extreme eastern edge of the petrographic province of Central Montana. They |  | | Journal (article/letter/editorial) | | Pseudoleucite in a Tinguaite from the Bearpaw Mountains, Montana by E . G. ZIES and F. CHAYES Geophysical...remarkable alkaline complex which underlies the Bearpaw Mountains. The United States Geological Survey has now...mineral is variously referred to as alkalifeldspar, orthoclase, anorthoclase, or, rarely, sanidine. The geological...localitiesâMagnet Cove, the Highwood and Bearpaw Mountains, Pocos de Caldas, Sierra de Tingua, Serra...evidence, that the primary phase of the Highwood Mountains 'pseudoleucites' was potassic analcime rather |  | Rukhlov, Alexei S., Blinova, Alexandra I., Pawlowicz, John G. (2013) Geochemistry, mineralogy and petrology of the Eocene potassic magmatism from the Milk River area, southern Alberta, and Sweet Grass Hills, northern Montana. Chemical Geology, 353. 280-302 doi:10.1016/j.chemgeo.2012.10.024 | Journal (article/letter/editorial) | | southern Alberta, and Sweet Grass Hills, northern Montana Alexei S. Rukhlov a,â, Alexandra I. Blinova b,...high-K rhyolite of the Sweet Grass Hills, northern Montana. These rocks comprise dikes, small plugs and a...Hills and mark the northern extent of the Cenozoic Montana Alkaline Province. Minerals restricted to peralkaline...within the Late CretaceousâOligocene (75â28 Ma) Montana alkaline province (MAP) and environs (e.g., Pirsson...for the origin of Cenozoic potassic rocks of the Montana alkaline province involve mixing of at least two |  | | Journal (article/letter/editorial) | | carbonate rocks. The Casper formation of the Laramie Mountains is tentatively divided into lower, middle, and...THE PRECAMBRIAN METAMORPHIC TERRANE, FARMINGTON MOUNTAINS, UTAH Gordon L. Bell 1520 Kensington Avenue, Salt...northern Farmington Mountains, a division of the north-central Wasatch Mountains, Utah, are characterized...fabric of the diaphthorite is presented. The mountains are essentially a composite series of north-northwest...trending fault blocks bounded by normal faults. The mountains are bounded on the west by the great Wasatch fault |  | | Journal (article/letter/editorial) | | mainly an oriented intergrowth of nepheline and orthoclase with additional minerals phases such as white...only in the sanidine that is associated with orthoclase in pseudoleucite crystal while the feldspar in...pseudoleucite from Ghori resembles that from the Bearpaw Mountain, Montana (Zies and Chayes, 1960), whereas it differs...Host Tinguaite PseudoChina Pseudoleucite PseudoMontana Or 900° Ne Ks Fig. 6. Composition of pseudoleucite...(open squared) and pseudoleucite from Bearpaw Mountains, Montana (star). mica, analcime that suggest |  | | Book (edition) | | most of the field work on the Iron Hill complex of Gunnison County, Colorado, in 1912-1913. Although his...accepted the idea of an igneous origin for the Iron Hill carbonatite. In 1924 Bowen, who had visited the...Cove, Arkansas (Erickson and Blade, 1963), Iron Hill, Colorado (Olson and Wallace, 1956), Mountain Pass...southwestern Montana (Heinrich and Levinson, 1961), and the Bearpaw Mountains, Montana (Pecora, 1962)...and the core carbonatite is eccentric, as at Iron Hill, Colorado, or Songwe, Nyasaland. It is not to be |  | | Journal (article/letter/editorial) | | mineral components such as a granite with quartz, orthoclase and biotite, and a gabbro with But others occur...with much quartz and orthoclase and little biotite, and a syenite with much orthoclase and little quartz...Yellowstone National Park. Crazy Mountains, Mont. Little Belt Mountains, Mont. * * DIAGRAM 5. DIAGRAM...DIAGRAM 6. Highwood Mountains, Mont. Bearpaw Mountains, Mont. ROCK CLASSIFICATION 97 does not occur...aluminium and potassium, for example, may enter orthoclase, leucite or biotite according to circumstances |  | | Journal (article/letter/editorial) | | leucite in glass 1118 2. Pseudoleucite from Bearpaw Mountains, Montana 1119 Table 1. Chemical analysis and...conditions is essential rocks of the Highwood Mountains, Montana, for an understanding of the genesis of all...of pseudoleucite specimens from the Bearpaw Mountains of Montana. The financial assistance of the National...cent of KAlSijOg (hereafter referred to as the "orthoclase" content) present in _the sanidine was determined...it was treated with HC1 before attempting the "orthoclase" determinations. Leucite reflections did not |  | | Report (volume) | | GEOLOGY OF THE IGNEOUS ROCKS OF THE HIGHWOOD MOUNTAINS, MONTANA BY LOUIS VALENTINE PIRSSO1ST WASHINGTON...................... ......................... Montana formation ._-.......-.....---... --.---.-.--.-...Page. PLATE I. Topographic map of the Highwood Mountains .........-..-.. . 14 II. A, View northward from...of vol' canic debris; 13, Upper Davis Creek, mountains of volcanic flows and breccias -..---.-...-.--...-... . 16 III. Geologic map of the Highwood Mountains ...................... 20 IV. A, Columns of |  | | Journal (article/letter/editorial) | | crystal was noted in the Luella mine near Avon, Latah county, Idaho, which measured 3x3x8 feet. Other large...Dakota. A black crystal from Micaville, Randolph county, Alabama, was 10 inches in diameter and from 3...noted in the School Section pegmatite of Fremont county, Colorado. ROCKS AND MINERALS Maine, Connecticut...pink and green crystals at Ohio City, Gunnison county, Colorado; dark green, pink, and indicolite tourmalines...miles west of Canon City, Colorado; at Clip, Yuma county, Arizona; and a few other places. CENTRALLASITE |  | | Journal (article/letter/editorial) | | MAINE1 EDSON S. BASTIN I. PROWERSOSE FROM KNOX COUNTY This unusual rock was collected by the writerin...summerof 1905 near Burkettville post-office in Knox County, Maine. It outcrops over a nearly circular area...Washington,and north into the town of Liberty (Waldo County). It intrudes pelite schists and gneisses, and...intergrowthor a somewhat irregularinterpenetrationof orthoclase or microcline, and albite. Microcline and orthoclasemay...phenocrystsare pure microcline, and a very few are pure orthoclase. Albite, not intergrown with the potash feldspars |
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