 | | Journal (article/letter/editorial) | | SYENITE PEGMATITES, ROCKY BOY STOCK, BEARPAW MOUNTAINS, MONTANA Wrlrteu T. Pncone, Geologi.cal Survey...Segregation pegmatites Lens-shaped pegmatites. Pegmatite dikes 40r 402 403 408 408 409 409 409 Pegmatitic...420 421 422 422 423 423 424 Albite . . Brookite. Zircon... . Stilpnomelane. Elpidite (?). . Paragenesis...of Tertiary alkalic rocks in the Bearparv Mountains, Montana. The pegmatites occur in the field as small...geologicalinvestigations of the Bearpaw Mountains of north-central Montana, the writer studiedseveral unusual |  | | Journal (article/letter/editorial) | | nepheline-syenite pegmatites at Pegmatite Peak, Bearpaw Mts, Montana A. R. Chakhmouradian and R. H. Mitchell...1999 Summary The pegmatites at Pegmatite Peak (Bearpaw Mts., Montana) crystallized from an evolved fraction...accessory assemblage includes Mg-Fe mica, rutile, zircon, titaniferous magnetite and thorite. Precipitation...[chevkinite-(Ce)]. Strontiochevkinite from Pegmatite Peak is compositionally similar to the type material...yon Pegmatite Peak, Bearpaw Mrs., Montana Die Pegmatite yon Pegmatite Peak (Bearpaw Mts., Montana) sind |  | | 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) | | Survey, 956 National Center, Reston, Virginia 20192, USA ABSTR ACT The composition of chevkinite and perrierite...Society from nepheline syenite pegmatites in Montana (Chakhmouradian and Mitchell, 1999), polyakovite...polyakovite, found in a dolomite vein in the Ilmen Mountains in the Urals, Russia (Popov et al., 2001), a Mg-Al-rich...analyses of chevkinite-group minerals from the western USA, Virginia, Russia, Malawi, Mali and Madagascar are...Tshirege Member of the Bandelier Tuff, Jemez Mountains, New Mexico, where it is associated with quartz |  | | 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...malignites and nepheline microsyenites). All pegmatite veins are composed predominantly of potassium...earliest paragenesis to crystallize included accessory zircon and thorite. Sr-rich loparite also precipitated...Alkaline igneous rocks of central and western Montana (USA) exhibit great petrographic diversity, and are |  | | Report (volume) | | Arabia. A few determinations were made of detrital zircon from sedimentary rocks to obtain information of...ios of the different accessory minerals xenotime, zircon, and monazi l.e. The thorium to uranium ratio given...lead determinations were made on a given sample of zircon, all the values are entered in the tabulation and...DETERMINATION Replicate age determinations were made of zircon from the same rock in 85 of the 411 rocks reported...been measured. The agreement between the ages of zircon, monazite, and xenotime, separated from the same |  | | | | Geological Survey, 956 National Center, Reston, VA 20192, USA 4 Camborne School of Mines, School of Geography,...presented of chevkinite-group minerals from Canada, USA, Guatemala, Norway, Scotland, Italy and India. The...IMA-approved) include perrierite-(La) found in a syenitic pegmatite from BjĂžrkedalen, Oslofjord, Norway (Segalstad...perrierite-(Ca) perrierite-(Ca) 7 8 Pegmatitic Bearpaw Mts, Montana Burley Farm, Virginia BjĂžrkedalen, Norway...East Antarctica nepheline syenite granitoid pegmatite syenite cutting gneisses strontio-chevkinite |  | | Conference Paper/Abstract | | associated alkaline rocks from Gordon Butte, Crazy Mountains (Montana) Roger H. Mitchell (Lakehead University)...Alkaline igneous rocks of central and western Montana (U.S.A.) exhibit a great petrographic diversity...Alkaline parageneses of different provenance from Montana have been shown to contain a variety of rare minerals...Mitchell 1999). Igneous lithologies of the Crazy Mountains area include a subalkaline series (gabbro-diorite-granite)...assemblages from the Gordon Butte area, northern Crazy Mountains. At Gordon Butte, four major intrusive series |  | Macdonald, Ray, BagiĆski, BogusĆaw, Belkin, Harvey E., Stachowicz, Marcin (2019) Composition, paragenesis, and alteration of the chevkinite group of minerals. American Mineralogist, 104 (3) 348-369 doi:10.2138/am-2019-6772 | Journal (article/letter/editorial) | | Spring Tuff, southwest U.S.A. (titanite, chevkinite, zircon, and apatite), chevkinite played the dominant role...site of an Fe-rich chevkinite-(Ce) from Mianning County, Sichuan, China, was given 2+ 2+ by Yang et al...inter alia, of perrierite-(Ce) from the Bearpaw Mountains, Montana, U.S.A. (0.35â1.18 apfu; Chakhmouradian...may be an artifact arising from Ti uncorrected for peak interference. Figure 9. La vs.Y plot to show that...described, from a fenitised granite in the Ilmen Mountains, southern Urals, Russia, a phase that they named |  | Macdonald, R., BagiĆski, B., Kartashov, P., Zozulya, D., DzierĆŒanowski, P. (2012) Chevkinite-group minerals from Russia and Mongolia: new compositional data from metasomatites and ore deposits. Mineralogical Magazine, 76 (3) 535-549 doi:10.1180/minmag.2012.076.3.06 | Journal (article/letter/editorial) | | from the apical parts of granitic bodies) and a pegmatite (sample 5745b). Sample K3 is from borehole DH#...Cr-rich CGM polyakovite-(Ce) is in the Ilmen mountains, southern Urals. It was found in a dolomite veinlet...CGM (sample K4) from a syenite pegmatite in vein 35, Vishnevye mountains, Chelyabinsk Oblastâ, which is...probe current was 20 nA. Counting times were 20 s on peak and 10 s on each of two background positions. The...chevkinite-(Ce) Mineral metasomatite dolomite vein pegmatite pegmatite apatite ore ores associated ores associated |  | | Journal (article/letter/editorial) | | Mont SaintHilaire (QuĂ©bec, Canada), and Bearpaw Mts. (Montana, USA). The present work also provides new...(as pseudomorphs after loparite), and from a pegmatite at Mt. Kuivchorr (as discrete crystals) by Semenov...parageneses, where it is typically associated with zircon and ilmenite (e.g., Semenov et al., 1963). However...Selsurt (Chakhmouradian & Sitnikova, 1999), and a pegmatite vein intersected by the Karnasurt mine (Zadov...assemblage characteristic of miaskitic rocks, i.e., with zircon, biotite, ilmenite, titanite and apatite, attesting |  | Macdonald, R., BagiĆski, B., Kartashov, P. M., Zozulya, D., DzierĆŒnowski, P. (2015) Hydrothermal alteration of chevkinite-group minerals. Part 2. Metasomatite from the Keivy massif, Kola Peninsula, Russia. Mineralogical Magazine, 79 (5) 1039-1059 doi:10.1180/minmag.2015.079.5.02 | Journal (article/letter/editorial) | | areas 1b and 2. Chv, chevkinite; Qtz, quartz; Zrn, zircon. intruded and metasomatically altered a range...mineralization includes, in addition to chevkinite(Ce), zircon, thorite, allanite-ferriallanite-(Ce), fergusonite-(Y)...with the quartz are abundant euhedral crystals of zircon. Areas marked as 1b and 2 show the transition from...aeschynite-(Y) and hydroxylbastnĂ€site-(Ce) (Bst). The zircon (Zrn) at the bottom of the image is taken to be...britholite-(Ce) grains occur near the contact with a zircon crystal which is assumed to have been primary. |  | | Journal (article/letter/editorial) | | pyrochlore but observed that some have biotite + zircon in place of astrophyllite + dalyite. Whole-rock...arfvedsonite, augite and/or aegirine, Fe-Ti oxide, zircon, pyrochlore, rare biotite and a few modal percent...0 â 5% quartz. Apatite, titanite, aenigmatite, zircon, chevkinite-(Ce), pyrochlore, dalyite and thorite...titanite, Ap = apatite, Ang = aenigmatite, Zrc = zircon, Chv = chevkinite-(Ce), Thr = thorite, Dlt = dalyite...Photomicrographs of: (a) interstitial amphibole, zircon and chevkinite-(Ce) (plane-polarized light, sample |  | Cooper, Alan F., Collins, Alice K., Palin, J. Michael, Spratt, John (2015) Mineralogical evolution and REE mobility during crystallisation of ancylite-bearing ferrocarbonatite, Haast River, New Zealand. Lithos, 216. 324-337 doi:10.1016/j.lithos.2015.01.005 | Journal (article/letter/editorial) | | have been recorded from carbonatite at Rocky Boy, Montana (Reguir and Mitchell, 2000), from ancylite-(La)...Ilimaussaq (Petersen et al., 2001), and from BearPaw Mountains (Chakhmouradian pers. comm. 2012). In the...of which, from pegmatite-hosted parageneses at Iveland, Norway and Jefferson County, USA, have chondritenormalised...nepheline-syenite pegmatites at Pegmatite Peak, Bearpaw Mts, Montana. Mineralogy and Petrology 67, 85â110...alkaline pegmatites from Gordon Butte, Crazy Mountains Montana, USA): comparisons between potassic and sodic |  | KrmĂÄek, LukĂĄĆĄ, CempĂrek, Jan, HavlĂn, AleĆĄ, PĆichystal, AntonĂn, Houzar, Stanislav, KrmĂÄkovĂĄ, Michaela, Gadas, Petr (2011) Mineralogy and petrogenesis of a BaâTiâZr-rich peralkaline dyke from Ć ebkovice (Czech Republic): Recognition of the most lamproitic Variscan intrusion. Lithos, 121 (1) 74-86 doi:10.1016/j.lithos.2010.10.005 | Journal (article/letter/editorial) | | A few contacts between the dyke and an older pegmatite have been found. The dyke is at least 200 m long...each background corresponded to the one half of the peak counting time. The following standards were used...Tiâbenitoite, Nbâcolumbite, TaâCrTa2O6, SrâSrSO4, Zrâ zircon, Pbâvanadinite, Crâchromite, Znâgahnite, ScâScP5O14...features were observed at the contact with the host pegmatite (Fig. 2a and b). The very ïŹne-grained margin shows...any of the other early minerals (e.g. apatite, zircon). Subhedral crystals of microcline show the characteristic |  | | Journal (article/letter/editorial) | | incompatible and volatile elements in late-magmatic, pegmatite and postmagmatic mineral parageneses. These substitutions...the early âmiaskiticâ paragenesis together with zircon, pyrochlore, allanite and fergusonite. In some...eudialyte-I replaced by a mixture of britholite-(Ce), zircon, strontiopyrochlore and allanite-(Ce) followed...data than using single-LREE standards. However, peak proïŹles used for the analytical lines were established...unidentiïŹed deuteric silicate of Th (huttonite?), Zrn: zircon. 469 R. P. LIFEROVICH AND R. H. MITCHELL but |  | | Book | | Buffalo, New York 14205 66 Leek Crescent Richmond Hill, Ontario L4B 1H1 Design and Layout: Joseph Gisini/PageWave...139) Page 248: Quartz (amethyst variety), Erongo Mountains, Namibia * 5 x 6 x 3 cm Page 251: Calcite, Irai...Serbia Âą tixex7 cm LEFT: Fluorite, Taihang Shan Mountains, Hebei, China * (Sexes selem 10 | MINERALS:...considered to be minerals. Microcline, Crystal Peak, Colorado, USA * 12 x 9x 5 om MINERALS: PRODUCTS OF A...a fracture, producing such forms as aegirine pegmatite. As well, hot hydrothermal fluids often carry |  | | Journal (article/letter/editorial) | | described by CÌernyÌ et al. (1995) in a granite pegmatite contains considerably more total Ta plus Nb, but...ilmenite (Fe, Ti), hematite (Fe), periclase (Mg), zircon (Zr), wollastonite (Ca), metallic Mn (Mn), Ta (Ta)...with EDS spectrum-stripping techniques. However, peak profiles used for the analytical lines were obtained...(see text for details). pegmatite at Pegmatite Peak, Bearpaw Mountains, Montana (Chakhmouradian & Mitchell...nepheline-syenite pegmatites at Pegmatite Peak, Bearpaw Mts., Montana. Mineral. Petrol. 67, 85-110. ________ |  | Barkov, Andrei Y., Fleet, Michael E., Martin, Robert F., Men'shikov, Yuri P. (2006) Sr-Na-REE titanates of the crichtonite group from a fenitized megaxenolith, Khibina alkaline complex, Kola Peninsula, Russia: first occurrence and implications. European Journal of Mineralogy, 18 (4) 493-502 doi:10.1127/0935-1221/2006/0018-0493 | Journal (article/letter/editorial) | | (Sr), MAC standards (Ce, La, Sm, Pr, Nd, and Y), zircon (Zr), Na2Nb2O6 (Nb), BaSO4 (Ba), and ZnS (Zn)....titanates from other localities Garnet Ridge, Arizona, USA (Wang et al., 1999). Landauite from the Burpala alkaline...from nepheline syenite pegmatites at Pegmatite Peak, Montana, USA (Chakhmouradian & Mitchell, 1999). Minerals...nepheline-syenite pegmatites at Pegmatite Peak, Bearpaw Mts., Montana. Mineral. Petrol., 67, 85-110. Filippov...inclusions in pyrope crystals from Garnet Ridge, Arizona, USA: implications for processes in the upper mantle. |  | | Journal (article/letter/editorial) | | common minerals such as ilmenite, titanite and zircon, and (ii): The strongly SC R peralkaline agpaitic...Na-Ca-Zr-F disilicate minerals was preceded not by a zircon-bearing miaskitic mineral assemblage but by zirconium...boundary zone of a pegmatite vein and MA MEPB37C from the core of the same pegmatite. The most abundant...designated Amph2 (Fig. 2a, b, c, d). In CE P the pegmatite, minor amounts of amphibole similar to Amph2 in...mineral) were used. Counting time was 10 to 30 s on peak (and half-time on each of the 2 background positions) |  | | Journal (article/letter/editorial) | | schorlomite, phlogopite, titanite, cerite-(Ce), chlorite, zircon, zirconosilicates, CaâAl silicates, zeolites, carbonatite...schorlomite, phlogopite, titanite, cĂ©rite-(Ce), chlorite, zircon, zirconosilicates, silicates de CaâAl, zĂ©olites...typically found in an assemblage with ilmenite and zircon. All varieties of titanite deviate significantly...Al3+ and Nb5+ (cf. data of Hughes et al. 1997). Zircon is found as scarce crystals embedded in grayish...with zircon include amphibole, schorlomite and ilmenite. Three morphological types of 1357 zircon were |  | Liferovich, R. P., Mitchell, R. H., Zozulya, D. R., Shpachenko, A. K. (2006) Paragenesis and composition of banalsite, stronalsite, and their solid solution in nepheline syenite and ultramafic alkaline rocks. The Canadian Mineralogist, 44 (4) 929-942 doi:10.2113/gscanmin.44.4.929 | Journal (article/letter/editorial) | | postmagmatic phases. Accessories present include zircon, titanian magnetite, pyrochlore, fluorite, meliphanite...present. Accessories include early wollastonite, zircon, ZrâTi-rich garnet, and a variety of pyrochlore-group...(UK), and Tony Nikischer (Excalibur Mineral Corp., USA) for providing stronalsite and banalsite samples...nepheline-syenite pegmatites at Pegmatite Peak, Bearpaw Mts., Montana. Mineral. Petrol. 67, 85-110. Chakhmouradian...Zr-rich pegmatites from Gordon Butte, Crazy Mountains (Montana, USA): comparisons between potassic and sodic |  | | Journal (article/letter/editorial) | | Microscope (Thermo Fisher Scientific, Waltham, MA, USA) coupled with an INCA Energy 250 EDS microanalysis...microprobe (JEOL USA, Peabody, MA, USA) with five wavelength dispersive spectrometers (JEOL USA, Peabody, MA...MA, USA), also located at the Scientific and Technological Centres of the University of Barcelona. Operating...counting time was 10 s peak and 10 s background except for Ce, La, Ba (20 s peak and 20 s background),... and Na and F (30 s peak and 30 s background). The acquisition method used was two background measurements |  | Morgenstern, Regine, Turnbull, Rose E., Ashwell, Paul A., Horton, Travis W., Oze, Christopher (2019) Petrological and geochemical characteristics of REE mineralization in the A-type French Creek Granite, New Zealand. Mineralium Deposita, 54 (7) 935-958 doi:10.1007/s00126-018-0854-9 | Journal (article/letter/editorial) | | enrichment is defined by the occurrence of allanite, zircon, apatite, fergusonite, monazite, perrierite, and...bastnĂ€site group minerals, monazite, xenotime, and zircon. Quartz protuberances, dilatational microfractures...College, 1600 Campus Road, Los Angeles, CA 90041, USA Rare earth elements (REE) are a fundamental component...LA-ICP-MS analyses and U-Pb zircon dating Optical petrology In situ zircon and bastnĂ€site [(Ce,La)(CO3)F]...was used for 10 bastnĂ€site spot analyses. Raw mass peak count rates were background subtracted, corrected |  | | Report (issue) | | ..................... 24 Regional rare-metal pegmatite zoning and lithogeochemical anomalies ................................................... 25 Pegmatite dimensions and structure .............................................................. 33 Bald Hill ........................................................................................ 99 Beryl Hill ....................................................................................... 104 Camel Hill ............................................... |
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