 | | Journal (article/letter/editorial) | | in an Olivine Cumulate from the Stillwater Complex, Southwestern Montana Norman J Page U.S. Geological...cumulates of the Ultramafic zone of the Stillwater Complex, Montana, are progressively altered to serpentine...serpentine minerals and thompsonite. Lizardite and chrysotile developed in the cumulus olivine and postcumulus...member, Ultramafic zone) from the Stillwater Complex, southwestern Montana, was selected for study because...Ultramafic zone. They include (1) the lizardite-chrysotile-magnetite _+thompsonite (or other zeolites) _+calcite |  | | Report (volume) | | Ultramafic Rocks from the Red Lodge District, Montana U.S. GEOLOGICAL SURVEY BULLETIN 1626-B Chapter...Ultramafic Rocks from the Red Lodge District, Montana By PATRICIA J. LOFERSKI Petrography, mineral chemistry...ultramafic rocks from the Red Lodge District, Montana. (Contributions to the geology of mineral deposits)...19.3.1626-B 1. Rocks, Ultrabasic. 2. Chromite Montana Red Lodge Region. I. Title. II. Series. III. Series:...Ultramafic Rocks from the Red Lodge District, Montana By Patricia J. Loferski Abstract The chromite |  | | Journal (article/letter/editorial) | | weathering origin. The 6D values of the lizardite-chrysotile serpentines from all of the ultramafic rock types...latitude of the sample locality. The lizardite-chrysotile samples show a progressive change in 6D that...- 162 to -205). The 601* values of lizardite-chrysotile range from +8*7 to -5.0 per mil and are more...serpentinization, suggest that much of this lizardite-chrysotile serpentinization probably formed by waters of...of serpentmization. In contrast to lizardite-chrysotile, the pure antigorites have very restricted ranges |  | | Journal (article/letter/editorial) | | Arm and the Central Sector of Mashava Igneous Complex in south central Zimbabwe from an investigation...Arm and the Central Sector of Mashava Igneous Complex in south central Zimbabwe from an investigation...Arm and the Central Sector of Mashava Igneous Complex in south central Zimbabwe from an investigation...of the economically important Mashava Igneous Complex (MIC) in Zimbabwe was conducted using petrographic...into its origin. The MIC, an ultramafic-mafic complex located in the western extremity of the Masvingo |  | | Journal (article/letter/editorial) | | High-temperature carbonate minerals in the Stillwater Complex, Montana, USA Hannah M. Aird ā¢ Alan E. Boudreau...platiniferous Johns-Manville (J-M) reef of the Stillwater Complex in a stratigraphic section that has been...serpentinite) that occur locally throughout the complex. The association of high-temperature carbonates...Ocean Sciences, Duke University, Durham, NC 27708, USA e-mail: hannah.aird@duke.edu them at a higher stratigraphic...J-M reef of the Stillwater Complex and the analogous Merensky reef of the Bushveld Complex in South Africa |  | | Report (issue) | | mafic-ultramafic Synorogenic synvolcanic Ni Dunitic Ni Chrysotile asbestos 3.4 3.5 Komatiitic Ni Volcanogenic...anorthoslte-gabbro and magnetite ilmenlte in intrusive complex. PGE placers. Metal Concentrations NI, PGE, Cr...Weathering Gossan Geochemical Signature; Examples Stillwater Complex Cu, Ni, PGE, Co References Page (1977) ...anorthosite, minor troctolite > LAYERED STRATIFORM COMPLEX X X X X PGE zone Cumulus pyroxenite Chromite...Geochemical Signature; Examples Bushveld Stillwater Complex PGE, Cu, Ni References Vermaak & Hendriks |  | | Report (issue) | | minerals in ultramaĀÆc igneous rocks. Association: Chrysotile, brucite, magnetite. Distribution: Probably...In the USA, in the Stillwater complex, Montana. Name: For the type locality, the Lizard complex, Cornwall...National Museum of Natural History, Washington, D.C., USA, 114569. References: (1) Whittaker, E.J.W. and J |  | | Journal (article/letter/editorial) | | studying these low temperature processes. The complex contains a sequence of chromitite layers hosted...with those of chromitite layers in the Bushveld complex of South Africa. Although the PGE geochemistry...Latitude South and 40 200 Longitude West. The complex consists of a tabular, arch-shaped body approximately...Transamazonic deformation event (2.2ā1.8 Ga), the layered complex underwent low-grade regional metamorphism and was...conclude the geological cycle of the Campo Formoso complex. As a consequence of this long geological history |  | 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) | | established by Beeson and Jackson (1969) for the Stillwater complex can not be extrapolated to this rock suite...CHROMITE DT]RING SERPENTINIZATION 1237 FIo. 1. Chrysotile serpentine (dark) surrounding augen of clinopyroxene...standardized with a gravimetrically analyzed Stillwater chromite, sample 52NL-11, from E. D. Jackson...magnetite, and the surrounding dark areasare chrysotile. GENE C, ULMER 1238 surementswere performedat...no detectablealuminum.The genetic sequenceof--chrysotile and antigorite and the low aluminum content of |  | | Journal (article/letter/editorial) | | centres of randomly orientated lizardite and chrysotile with antigorite replacing the margin of the pseudomorph...serpentinite consists of mesh-textured lizardite-chrysotile partly replaced by antigorite, together with...indicate that they consist of randomly orientated chrysotile accompanied in places by subordinate amounts...Antigorite has partly replaced the lizardite-chrysotile mesh as coarse fibrolamellar fringes around and...by various secondary textures characterized by chrysotile and antigorite. He further concluded from a detailed |  | | Journal (article/letter/editorial) | | Worcester Polytechnical Institute, Worcester, MA 01609, USA CarbMinLab, Department of Earth, Ocean, and Atmospheric...University of Pennsylvania, Philadelphia, PA 19104, USA; jlwilcox@seas.upenn.edu Correspondence: cmwoodall@wpi...magnesium-bearing mine tailings. The Stillwater mine in Nye, Montana produces copper, nickel, and PGMs,... along with 1 Mt of tailings each year. Stillwater tailings samples have been characterized, revealing...structures at low-cost ambient conditions. The Stillwater tailings could be useful for developing strategies |  | | Journal (article/letter/editorial) | | by gneisses and schists of the Malawi Basement Complex (Bloomfield and Garson, 1965). The body is composed...resting in a m e s h structure o f pale-yellow chrysotile. Small grains o f o p a q u e spinel m a k e...carbonate. T h e identifications of chlorite a n d chrysotile were confirmed by X-ray powder p h o t o g r...Chimwadzulu Hill, have been described from the Stillwater Complex, Montana, and CHROMITE-CHLORITE INTERGROWTHS...specimens HH53 (A-E2) and I-IH26 (F-J). In the Stillwater Complex, Beeson and Jackson 0969) described a ferrit-chromit |  | | Journal (article/letter/editorial) | | n of REE-rich chlorapatite from the Stillwater Complex, Montana A. E. Bounnp.q,u Department of Geology...de mineralization of the J-M Reef of the Stillwater Complex. The chlorapatite may contain in excessof...platinum-group elernent(rce) deposit ofthe Stillwater Complex, the J-M Reef, are unusual in that they contain...StillwaterComplex,Page(1976)identified lizardite and chrysotile (after olivine) and thomp- terarion ofprimary...Apatite occurs as a minor phase throughout the Stillwater Complex and associated rocks (Boudreau and McCallum |  | | Report (issue) | | study area, Custer and Gallatin National Forests, Montana Edited by JANE M. HAMMARSTROM1, MICHAEL L. ZIENTEK2...Study Area, Custer and Gallatin National Forests, Montana U.S. Geological Survey Open-File Report 93-207...700 km2) of National Forest land in southwestern Montana adjacent to the northern part of Yellowstone National...elements. Mines in production in 1992 are the Stillwater mine (platinum, palladium, gold, rhodium, copper...exploration led to the discovery and development of the Stillwater mine and the discovery of gold-copper-silver |  | | Journal (article/letter/editorial) | | Great Dyke, Zimbabwe; Duluth, Canada; Stillwater, Montana, USA Central Lapland Greenstone Belt, Finland;...Belt, Australia Urals, Russia; Duke Island, Alaska, USA and Turnagain, British Columbia, Canada Bide et...areal extent of the Skaergaard layered igneous complex, which is 100 km2 (McBirney, 1996). For the BGS...example Muskox, Great Dyke, RincoĢn del Tigre and Stillwater, which all have areas between 1000 and 3000 km2...ultramafic rocks (Wilson, 1996) to the Bushveld Complex, one of the largest layered igneous intrusions |  | | Report (volume) | | Phlogopite Within an Olivine Cumulate in the Stillwater Complex, Montana U.S. GEOLOGICAL SURVEY BULLETIN 1674-A...Within an Olivine Cumulate in the Still water Complex, Montana By NORMAN J PAGE and MICHAEL L. ZIENTEK U...phlogopite within an olivine cumulate in the Stillwater Complex, Montana. (Contributions on ore deposits in the...3:1674-A 1. Amphiboles Montana. 2. Phlogopite Montana. 3. Chrysolite Montana, I. Zientek, Michael L....olivine cumulate of cyclic unit 2, Still water Complex, Montana A8 3. Electron microprobe analyses and calculated |  | | Journal (article/letter/editorial) | | in the southern Appalachians Piedmont in Georgia, USA. Oxygen isotope compositions obtained by laser-fluorination...other bodies, the River Road and the Nancy Hart complex, show average plagioclase Ī“18O values of 7.2ā° and...Similarly, the River Road body and the Nancy Hart complex yield much lower oxygen isotope thermometry temperatures...Bindeman et al. 2008), the Stillwater Complex (e.g., Dunn 1986), the Bushveld Complex (e.g., Schiffries & Rye...intrusion (e.g., Chalokwu et al. 1993), the Duluth complex (Lee & Ripley 1996), the Great Dyke (Chaumba & |  | | Report (issue) | | these minerals (Ross, in press). For example, chrysotile asbestos, the most common form of asbestos used...mineralogic products of pre-mining oxidation are a complex function of deposit geology, hydrology, topography...are in their infancy. In detail, the subject is complex, but some generalizations can be made by considering...1993 Mined Land Reclamation Symposium, Billings, Montana, v. 1, p. 176-186. Rose, A.W., Hawkes, H.E., and...water, sediment and air, bioavailability is a complex function of many factors including total concentration |  | | Book (edition) | | layered intrusions, such as the famed Stillwater Complex in Montana. Perhaps the most famous layered intrusive...Bushveld Complex of South Africa, the source of much of the worldās platinum. These complex intrusions...monuments, and statues. The gabbros of Montana around the Stillwater Complex are the most noteworthy, but gabbro...England and along the East Coast. California, Montana, Colorado, Idaho, and Arizona are noteworthy in...serpentinite. Peridotite locales include Montanaās Stillwater Complex and Wyomingās State Line kimberlite district |  | | Journal (article/letter/editorial) | | Mountain massif of the Bay of Islands ophiolite complex, Newfoundland. In a suite of 59 dunites and werhiites...Iizardite + chrysotile t brucite + (accessory) magnetite. The ratio of (lizardite + chrysotile) to brucite...Mountain massif of the Bay of Islands ophiolite complex, N~foundiand, the cumulate ultramafic unit varies...North Arm Mountain frrTUS, 1984) has shown that chrysotile and lizardite are present in the serpentine mineral...20āC/minute. serpentine minerals liiardite and chrysotile. This may cause some confusion when āserpentineā |  | | Journal (article/letter/editorial) | | serpentinization of olivine websterite, Canyon Mountain complex, N.E. Oregon Bernard W. evans,1,* scott M. Kuehner...the higher Fe content of the serpentine. Unlike chrysotile, whose iron content expressed as X Fe [=Fe/(Fe+Mg)]...: YELLOW IRON-RICH LIzARDITE, CANYON MOUNTAIN COMPLEX, OREGON Lizardite 70 Frequency 60 50 40 30...websterite taken from the Canyon Mountain ophiolite complex, N.E. Oregon, which is inferred to exhibit M-site...: YELLOW IRON-RICH LIzARDITE, CANYON MOUNTAIN COMPLEX, OREGON 3.0 Si + Al/2 + Cr/2 apfu 2.8 2.6 Opx |  | | Report (issue) | | Geological Society of America Memoir 80 STILLWATER IGNEOUS COMPLEX, MONTANA A QUANTITATIVE MINERALOGICAL STUDY...Edward Sampson began the study of the Stillwater complex, Montana, in 1930. The writer commenced a detailed...detailed study of the mineralogy of the complex in 1935 after several periods in the field in preceding...Peoples would write the general geology of the complex, Howland the floor rocks and sulfide deposits,...have published a number of short papers on the complex. (Peoples, 1933; 1936; Howland, Peoples, and Sampson |  | | Report (issue) | | stratiform-type deposits, specifically those in the Bushveld Complex in South Africa and the Great Dyke in Zimbabwe...stratiform-type chromite deposits are the Bushveld Complex in the Republic of South Africa, the Kemi intrusion... , .. .... , - MADAGASCAR ..\ 'ā¢ >_;~ Selukwe Complex (11 . Ā· Ā·Ā· ( 'Ā· Tsaratanana district (11 (';I Great...Great Dyke (151 \.SOOTH AFRICA 'Ā·Ā·i-, ,Bushvetd Complex (61 Ā·Ā·--;-./' 1 . -~,. _; i' ,.. __ ; ~~...6. The discoveries of chromite in the Bushveld Complex in the Republic of South Africa and the Great Dyke |  | | 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 |
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