 | | Report (issue) | | Stillwater Complex, Montana: Rock Succession, Metamorphism, and Structure of the Complex and Adjacent...999 Stillwater Complex, Montana: Rock Succession, Metamorphism and Structure of the Complex and Adjacent...----Petrology and rock succession of the Stillwater Complex and adjacent rocks----------------------...metasedimentary rocks in the contact aureole of the Stillwater Complex -----------------------------------------Areal...---------------------------------------------------Stillwater Complex ---------------------------------------- |  | | Journal (article/letter/editorial) | | Old Main, 1 University Dr., Pembroke, NC 28372, USA; chaumba@uncp.edu Received: 24 May 2017; Accepted:...Great Dyke, Bushveld Complex in South Africa, the Stillwater Complex in Montana, USA, and the Noril’sk Ni-Cu-(PGE)...Bushveld Complex [7] and in the J-M reef of the Stillwater Complex [8–11]. In the Stillwater Complex, researchers... similar to those described from the Bushveld Complex [55,56]. The footwall fault (Figure 2b) is encountered...at Fayetteville State University, North Carolina, USA [58]. For all silicate samples, the Hyperprobe was |  | | Report (issue) | | from other stratiform bodies such as the Bushveld Complex, South Africa (Wager and Brown, 1968; Visser and...and von Gruenewaldt, 1970), Stillwater Complex, Montana (Hess, 1960; Jackson, 1961; Page, 1977), and Muskox...(1972^ documented evidence that in the Stillwater Complex, Montana, olivine within a single cumulate layer...original primocryst. Maal0e (1976) documented the complex compositional zoning of plagioclase in the Skaergaard...Continental strati form intrusions, such as the Stillwater, Bushveld, and Muskox, generally have chromite |  | Kanaris-Sotiriou, R., Gibb, F. G. F., Carswell, D. A., Curtis, C. D. (1978) Trace-element distribution and ore formation in vein-metasomatised peridotite at Kalskaret, near Tafjord, South Norway. Contributions to Mineralogy and Petrology, 67 (3) 289-295 doi:10.1007/bf00381456 | Journal (article/letter/editorial) | | near the boundary between the enstatite and anthophyllite zones gives rise to maxima in the Ni, Cu, S...mineralogy and major-element geochemistry of a complex assemblage of silicates in a vein crosscutting...position of the fracture and zones of tremolite, anthophyllite and enstatite between this and the peridotite...Almklovdalen, further west in the Norwegian Basal Gneiss Complex, have been tentatively dated as having formed in...was determined by A13 +, tremolite by Ca 2 +, anthophyllite by H 2 0 and enstatite possibly by Si(OH)~ |  | Hammarstrom, Jane Marie, Wilson, Anna B., Van Gosen, Bradley S., Carlson, Robert R., Kulik, Dolores M., Lee, Gregory K., Elliott, James E., Perry, William J., du Bray, Edward A., Zientek, Michael L. (1998) Mineral resource assessment; Custer and Gallatin national forests, Montana. Open-File Report Vol. 1998 (98-517) US Geological Survey doi:10.3133/ofr98517 | Report (issue) | | assessment: Custer & Gallatin National Forests, Montana by Jane M. Hammarstrom 1 , Anna B. Wilson2, Bradley...assessment: Custer & Gallatin National Forests, Montana The U.S. Geological Survey (USGS) conducts mineral...discrete parcels of federal land across southern Montana. Mineral resources are an important land management...production within the past 5 years include the Stillwater platinum-palladium mine, the Mineral Hill gold...contains the Stillwater Complex, a feature that is geologically unique in the western U.S. The Complex is a mafic |  | | Journal (article/letter/editorial) | | ultramafic rocks near the Pine Hill Intrusive Complex, a large mafic intrusion in the western Sierra...large mafic intrusion, the Pine Hill Intrusive Complex, have been emplaced during at least two separate...evidently unaffected by the Pine Hill Intrusive Complex and composed largely of serpentine minerals, were...Intrusive Complex. Those ultramafic rocks, contact metamorphosed by the Pine Hill Intrusive Complex, show...olivine+talc+chlorite+tremolite+Fe-Cr spinel-*- olivine +anthophyllite+chlorite+tremolite+Fe-Cr spinel ->• olivine |  | | Journal (article/letter/editorial) | | 1979Printed in GreatBritm Sm-Nd age of the Stillwater complex and the mantle evolution curve for neodymium...isochron determined for a gabbro from the Stillwater complex by the Sm-Nd method yields a precise age...8 + 0.2. A spectrum of total rocks in the Stillwater complex ranging from anorthosite to pyroxenite were...fractionation (-612% Nd/Sm enrichment) or that the Stillwater complex was highly contaminated with REE from much...we have confirmed that the RbSr data for the Stillwater are highly disturbed. This comparison indicates |  | | Journal (article/letter/editorial) | | show Cl enrichment as high as that seen in the Stillwater and Bushveld complexes beneath the major stratabound...OGabn = olivine gabbronorite, Tr-An = tremolite-anthophyllite peridotite, Troc = troctolite 1 Geochronology...microprobe at Duke University, Durham, North Carolina, USA. Typical analytical conditions were 15 Kev acceleration...y'y' d d d s y' a y' a a w ww a a a a y' s y' Stillwater and Bushveld below PGE reefs OH FIG 3. Halogen...show compositional ranges in the Bushveld and Stillwater complexes, the Great Dyke, and the Skaergaard |  | | Journal (article/letter/editorial) | | intrusions, located in gneisses of the Goias basal complex (Almeida, 1968), Goifis State (Fig. 1). The only...Proterozoic metamorphic belt I--[ Goi6s basal complex 8° _ L..~:- [-~--~J Ma f ic ultramafic complexes...zones composed of anthophyllite schists, amphibolites, mylonites, etc, crosscut the complex. Portions of the...the complex pre- 30 M . A . F . Candia and ~. C. Oaspar r~a w ~ X o ~ , I.d o ~ ~ ~ ~ ...resulted in a granoblastic anthophyllite-bearing amphibolite containing anthophyllite, magnesio-hornblende |  | | Journal (article/letter/editorial) | | evolution of anthophyllite/cummingtonite-cordierite rocks from the upper unit of the Ordenes Complex (Galicia...are described for the first time in the Ordenes Complex (Galicia, NW Spain). The first type exhibits an...assemblage containing sillimanite, staurolite and anthophyllite, which are found as microinclusions in cordierite...matrix by a medium to low-pressure assemblage of anthophyllite, cordierite and garnet. The second type is represented...the uppermost unit of the Ordenes Complex, in which the anthophyllite-cummingtonite rocks are located, |  | | Report (issue) | | Iron Deposits of the Southwestern Ruby Range, Montana , , 'A " U,S. GEOLOGICAL SURVEY PROFESSIONAL...Iron Deposits of the Southwestern Ruby Range, Montana By HAROLD L. JAMES With a section on THE KELLY...mineral deposits of the southwestern Ruby Range, Montana UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON...iron deposits of the southwestern Ruby Range, Montana. (U.S. Geological Survey professional paper ; 1495)...Geology, Stratigraphic Precambrian. 2. Geology Montana Ruby Range. 3. Iron ores MontanaRuby Range. I. |  | | 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...be productive sources of mineral specimens. The Montana Gold Rush After giving up on the California gold...largest gold nugget found in Montana; it is displayed at (and owned by) the Montana Bureau of Mines and Geology |  | | Journal (article/letter/editorial) | | The Carr Boyd Rocks Complex is a small layered ultramafic to mafic intrusive complex of Archaean age about...petrographic studies. These studiesshow that the complex was formed from at least three compositionallydifferent...1971; Naldrett and .Gaspirini, 25 km. The layered complex under discussionintrudes 1971; Woodall and Travis...geochemicalsurveys. eralizedparts,on the westernmargin of the complex The broaddistributionof rock typesand the location...General Geology of the Complex x The interpretation of this stratiform complex is based The mineralization |  | | Journal (article/letter/editorial) | | Cr,ystallognaphy L83 516 2L3 1103 Gedrite-anthophyllite solws Geobaroneters 720 in pelitic schlsts 1031...iments Rocks (Cilpta and Yagl) 1309 Iron fomtlon, Montana The structure of FUESS, lt. see JoSWIG, W. 349...MEDENBACH,0. MITCHELL, R.H.: Pyroxenes of the 45 complex, Norway Fen alkaline MITCHELL, R.S., review of...(Dietrich and and, Minerals 576 Skinner) 1087 Montana, iron forMtion Monteregianite, new mineral (abstr)...phase transltlons Tridlrite, 1087 Conplex, Montana Stillwater 225 T U R N o C K ,A . C . s e e H U E B |  | | Journal (article/letter/editorial) | | compositions are characterized by cordierite + anthophyllite + chlorite + biotite + ilmenite ± plagioclase...quartz was also observed. Coexisting cordierite+ anthophyllite +cummingtonite was not observed in any rocks...cummingtonite-bearing rocks can apparently be derived from anthophyllite +garnet-bearing rocks by increasing temperature...may be a result of its rarity and reports of anthophyllite/gedrite overgrowths on cummingtonite in the...cummingtonite that is both mantled and unmantled by anthophyllite. We have seen similar textures in cordierite |  | | Journal (article/letter/editorial) | | melanorite and its stratiform pegmatoids, Bushveld Complex, South Africa – characteristics, timing and origins...Two Rivers Platinum Mine (eastern limb, Bushveld Complex) is fully enclosed within a UG2 melanorite that...Introduction The chromitite seams of the Bushveld Complex are the most laterally extensive on Earth, traceable...form pipes and sheet-like bodies in the Bushveld Complex (e.g. Viljoen and Scoon, 1985; Cawthorn et al....of the world-class PGE deposits in the Bushveld Complex (Merensky Reef, UG2, Platreef) are associated with |  | | Journal (article/letter/editorial) | | high-grade metamorphism Type II Min.-Ont., Type II Montana, Tvpe rrr asseEb.Zases -listed afe regatateal...+Otz+Mt Ol+Opx+Otz+Mt ffost I Southeestern Montana, Type I * (calcite, hematite) (cru) +etz+MtjOpx...1978):An l, anthophyllite ing reactions, Am, amosite (Goranson,1942);An 2, anthophyllite(Day andHalbach...(Krupaet al. 1979);Av, Hemleyet al.,1977); An 3, anthophyllite and averageheatcapacityof HzO (Miyano, 1978);Cr...assemblagesreported by Yaniman et al. (1980)from the Stillwater iron-formation suggestthat the following reaction |  | | Report (issue) | | OF ALTERED SERPENTINITES IN THE BURKS MOUNTAIN COMPLEX, COLUMBIA COUNTY, GEORGIA Mark D. Cocker GEORGIA...OF ALTERED SERPENTINITES IN THE BURKS MOUNTAIN COMPLEX, COLUMBIA COUNTY, GEORGIA Mark D. Cocker Georgia...43. Page Location map of the Burks Mountain complex and project area ................................OF ALTERED SERPENTINITES IN THE BURKS MOUNTAIN COMPLEX, COLUMBIA COUNTY, GEORGIA by Mark D. Cocker ABSTRACT...fragments of an elongate complex of mafic/ultramafic rocks called the Burks Mountain complex (Sacks and others |  | | Journal (article/letter/editorial) | | l0o/ogrunerite is less stable than magnesian anthophyllite at metamorphic temperatures of 600-700 'C. The...The inversion loop in the system FMSH, with anthophyllite as the low-temperatureform, probably has a minimum...equilibration below 300-400'C. rhombic (Pnma) anthophyllite is predominantly Mg rich Magnesio-cummingtonitehas...ferromaginto the range of gedrite. Mg-rich anthophyllite is typinesian cummingtonite (cf. Prewitt et...lower temperatures, solution behavior becomesmore complex, with both positive and negative departuresfrom |  | | Report (issue) | | Geology of North Snowy Block, Beartooth Mountains, Montana ROL LAND R . REID University of Idaho Moscow...W ILLIA.i\1 J. M cMA1'!Nls Montana State University Bozeman, Montana 59715 JOHN C. P ALMQUIST Lawrence...General . . . . . . Sheared gneiss ("Sgn") Anthophyllite schist Metaorbiculite Pegmatite .. Pegmatite...Endowment and Research Foundation, Montana State University, Bozeman, Montana, for administering the grant...thanks. The contributions of Charles C. Bradley, Montana State University, who worked with us through the |  | | Journal (article/letter/editorial) | | 20059, USA Branch, Code 691, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA 3Faculty...rock 399 © Meteoritical Society, 2003. Printed in USA. 400 G. Kletetschka, T. Kohout, and P. J. Wasilewski...Minnesota 7.76 10 Rhyolite tuff, Frying Pan Basin, Montana 14 11 Rhyolite, Castle Rock, Colorado 7.3 12 Rhyolite...Colorado 7.1 23 Latite porphyry, Bear Paw Mountains, Montana 7.9 24 Tonalite (quartz diorite), San Diego County...County, California 9.41 26 Dacite, N. W. of Helena, Montana 5.73 27 Hornblende andesite, Mt. Shasta, California |  | | Journal (article/letter/editorial) | | the evolution of natural examples. Key words: anthophyllite; ferric iron; gedrite; NCKFMASHTO; pseudosection;...act, actinolite; als, aluminosilicate; anth, anthophyllite; bi, biotite; cd, cordierite; chl, chlorite;...diagnostic distinctions between gedrite and anthophyllite (Robinson et al., 1971, 1982; Stout, 1972; Spear... chloritoid, cordierite, staurolite, talc, anthophyllite, gedrite, cummingtonite, orthopyroxene, the...presented in Fig. 1. Although both gedrite and anthophyllite were considered in the calculations, only one |  | | Journal (article/letter/editorial) | | EXAMPLE FROM THE KAREE MINE, WESTERN BUSHVELD COMPLEX, SOUTH AFRICA Malte Junge,† Thomas Oberthür, and... Abstract The UG-2 chromitite of the Bushveld Complex in South Africa contains the world’s largest resources...chromitite at the Karee mine in the western Bushveld Complex was studied in detail. Geochemically, Pt correlates...suite of discrete PGMs. Introduction The Bushveld Complex in South Africa (Fig. 1) is the largest layered...argued that the cumulate rocks within the Bushveld Complex were generated by crystal sorting of slurries deposited |  | | Journal (article/letter/editorial) | | from the Judith Moun316 . . I. Friedman, tains, Montana, possible reFritz Ephraim's Inorganic Chemaction...Montebrasite, x-raY data tensitiesof(Brown).... unan comPlex, Montmorillonite Micas, redescription of the single...Montmorillonite, x-ray analysis of an adsorption complex of, with cetyltrimethyl ammonium bromite (lissolamine)...Review) 131 Rodingite from the Girvan-Ballantrae complex, Ayrshire (Bloxham) 345 Roebling Medal, acceptance...(Nickel). 699 Sills in the Elkhorn Mountains, Montana, form and mode of emplacement of (Smedes) 336 Silverman |  | | Journal (article/letter/editorial) | | glaucophane may be thought of as jadeitef taic, anthophyllite as enstatitef taic, edenite as diopsidef "Na-biotite"...natural assemblages and in experimental studies of complex systems involving these mineral phases. These three...the alkalic rocks of New England. The Stillwater Complex in Montana contains biotite, not amphibole, in...Washington, D. C. 2000g. An anthophyllite from the Dillon Complex, Montana (Rabbitt, l94g), was selected...in the stability feld of anthophyllite. Recrystallization to anthophyllite should occur but since this |
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