 | | Journal (article/letter/editorial) | | PLATINUM GROUP ELEMENT DEPOSIT IN THE STILLWATER COMPLEX, MONTANA (USA) Corey J. Wall† and James S. Scoates... BC V6T-1Z4, Canada Abstract The Stillwater Complex, Montana (USA), is one of the world’s largest layered...high-precision crystallization ages for the reef and the Stillwater Complex. All samples are coarse grained to pegmatitic...samples are indistinguishable within uncertainty: Frog Pond adit (2709.11 ± 0.56 Ma), East Boulder mine (2709...± 0.45 Ma). A U-Pb baddeleyite date from the Frog Pond adit sample (2708.85 ± 0.46 Ma) is identical within |  | | Journal (article/letter/editorial) | | Nelson Lead isotopes in sul®des from the Stillwater Complex, Montana: evidence for subsolidus remobilization...Isotopic ratios of Pb in sul®de minerals (primarily pyrrhotite, chalcopyrite, and pentlandite) from a suite...samples from the platiniferous J-M Reef of the Stillwater Complex were measured to elucidate the temporal...351310 University of Washington Seattle, WA 98195, USA e-mail: mccallum@u.washington.edu Editorial responsibility:...enrichment and redistribution in the J-M Reef of the Stillwater Complex. Previous measurements of the isotopic |  | | Journal (article/letter/editorial) | | AND MINERALIZATION IN THE J–M REEF, STILLWATER COMPLEX, MONTANA JOSEPH S. POLOVINA 1254 Wonder Court...the J–M Reef and its footwall in the Stillwater Complex, Montana. We used optical microscopy, scanning...electron-microprobe analysis. The BMS identified are pyrrhotite, chalcopyrite, pentlandite and minor pyrite....petrography, geochemistry, layered intrusion, Stillwater Complex, Montana. SOMMAIRE Nous avons établi la minéralogie...J–M et les roches du socle du complexe de Stillwater, au Montana. A cette fin, nous avons utilisé la microscopie |  | | Journal (article/letter/editorial) | | the 1Montana College of Mineral Science, Butte, Montana, and the 2 Rockwell International Science Center...Mineralization in a Pegrnatoid Pyroxenite of the Stillwater Complex, Montana, U.S.A. A. Volborth 1 and R. M. Housley2...element mineralization in the Stillwater Layered Anorthosite Complex, Montana. The graphite occurs in a pegmatoid...under the main palladium-platinum zone of the Stillwater intrusion may have bearing on the genesis and...in einem pegmatoiden Pyroxenit des Stillwater-Komplexes, Montana: Ein vorla~tfigerBericht Wir beschreiben |  | Christopher Jenkins, M., Mungall, James E., Zientek, Michael L., Holick, Paul, Butak, Kevin (2020) The Nature and Composition of the J-M Reef, Stillwater Complex, Montana, USA. Economic Geology, 115 (8). 1799-1826 doi:10.5382/econgeo.4777 | Journal (article/letter/editorial) | | Nature and Composition of the J-M Reef, Stillwater Complex, Montana, USA M. Christopher Jenkins,1,2,† James...Washington 99201, USA 3Stillwater Mine, Sibanye-Stillwater, 2562 Nye Rd., Nye, Montana 59061, USA Abstract...mineralization in the J-M reef horizon of the Stillwater Complex along the strike and down the dip of...of the deposit in the area of the Stillwater mine. We compare these results with data from the East Boulder...different spatial domains of the Stillwater mine area and between the Stillwater and East Boulder mines. Most |  | | Journal (article/letter/editorial) | | Pt–Pd SULFIDE IN THE J–M REEF OF THE STILLWATER COMPLEX, MONTANA Chusi LI and Edward M. RIPLEY Department... Indiana 47401, USA Abstract Pt–Fe alloy (Pt3Fe) in the J–M Reef of the Stillwater Complex, as exposed...exposed in the Stillwater mine, in Montana, occurs intergrown with secondary Fe–Ni–Cu sulfide; together,...samples (>20 vol.%) from the J–M Reef at the Stillwater mine and elsewhere along the strike of the reef...desulfurization, alteration, J–M Reef, Stillwater Complex, Montana. Sommaire L’alliage Pt–Fe (Pt3Fe) faisant |  | LAMBERT, D. D., WALKER, R. J., MORGAN, J. W., SHIREY, S. B., CARLSON, R. W., ZIENTEK, M. L., LIPIN, B. R., KOSKI, M. S., COOPER, R. L. (1994) Re--Os and Sm--Nd Isotope Geochemistry of the Stillwater Complex, Montana: Implications for the Petrogenesis of the J-M Reef. Journal of Petrology, 35 (6) 1717-1753 doi:10.1093/petrology/35.6.1717 | Journal (article/letter/editorial) | | and Sm-Nd Isotope Geochemistry of the Stillwater Complex, Montana: Implications for the Petrogenesis of...Park, Maryland 20742, USA 3 US Geological Survey, Reston, Virginia 22092, USA Department of Terrestrial...Washington, DC 20015, USA 5 US Geological Survey, Spokane, Washington 99201, USA 6 Stillwater Mining Company... Nye, Montana 59061, USA 1 Department of Geology, Lamar University, Beaumont, Texas 77710, USA (Received...mafic and ultramafic cumulates from the 2700-Ma Stillwater Complex and associated fine-grained sills and |  | Czamanske, Gerald K., Bennett, Pauline C., Zientek, Michael L., Weiblen, Paul W., Havach, George A., Foose, Michael P. (1986) Comprehensive bibliographies on mineralized and unmineralized layer mafic intrusions in the United States. Open-File Report Vol. 1986 (86-589) US Geological Survey doi:10.3133/ofr86589a | Report (issue) | | The Duluth Complex, Minnesota, and the Stillwater Complex, Montana, are given separate status in this contribution...bibliography on the Stillwater Complex is an update of the comprehensive bibliography in Montana Bureau of Mines...Special Publication 92, entitled "The Stillwater Complex, Montana: Geology and Guide." The bibliography...1986. All citations in the bibliography on the Stillwater Complex have been carefully checked for accuracy...1115. Austin, G. S., 1961, Photogeology of Cook County, Minnesota: University of Minnesota, M.S. thesis |  | Wernette, B.W., Ripley, E.M., Li, C., Wintsch, R.P. (2018) Strongly negative δ34S values associated with secondary pyrite above and below the J-M Reef, Stillwater Complex, Montana. Chemical Geology, 493. 58-66 doi:10.1016/j.chemgeo.2018.05.023 | Journal (article/letter/editorial) | | pyrite above and below the J-M Reef, Stillwater Complex, Montana B.W. Wernette, E.M. Ripley, C. Li, R...pyrite above and below the J-M Reef, Stillwater Complex, Montana. The address for the corresponding author...Pyrite Above and Below the J-M Reef, Stillwater Complex, Montana IP T Wernette, B.W.1†, Ripley, E.M...Indiana University, Bloomington, Indiana 47405, USA US † – current address: Division of Earth and Ocean...North Carolina 27708, USA AC CE PT ED M AN Keywords: Sulfur isotopes, Stillwater Complex, J-M Reef |  | | Journal (article/letter/editorial) | | COMPOSITION OF PLATINUM-GROUP MINERALS IN THE J-M REEF, STILLWATER COMPLEX BÉLINDA GODEL,† Centre for Exploration...platinum-group element (PGE)–bearing J-M reef, Stillwater Complex (Montana). The aims of the study were to determine...Bushveld Complex (South Africa) and the Stillwater Complex (Montana) contain stratiform layers, or “reefs...elements (PGE). In both the Bushveld and the Stillwater Complexes, the PGE are found spatially associated...vol %) base metal sulfides consisting mainly of pyrrhotite, pentlandite, and chalcopyrite. The PGE are found |  | | Journal (article/letter/editorial) | | June 2016, Vol. 80(4), pp. 585–637 The Stillwater Complex, Montana – Overview and the significance of volatiles...Sciences, Duke University, Box 90227, Durham, NC 27708, USA [Received 31 May 2015; Accepted 19 November 2015;...ACT The geology of the 2.7 Ga Stillwater Complex in South-Central Montana is reviewed with a focus on the...involved in the crystallization of the Stillwater Complex. A dry Stillwater magma would have been mineralogically...element and chromium deposits. K E Y WO R D S : Stillwater Complex, layered intrusions, J-M Reef, platinum-group |  | | Journal (article/letter/editorial) | | Sulfur IsotopeStudiesof the Stillwater Complex and Associated Rocks, Montana MICHAEL L. ZIENTEK U.S....University,Bloomington,Indiana 47405 Abstract The Stillwater Complexin south-centralMontanais a late Archcanlayered...isotopiccompositionof sulfurin metamorphosedsedimentaryrocks,Stillwater-associated sillsanddikes,sulfideaccumulations...andmetashales (mean = 2.8%0);(2) iron-formation, Stillwater-associated sillsanddikes,andbasalsulfideaccumulations...constitutes the fide mineralsare presentin mostof the Stillwater PicketPin deposit(BoudreauandMcCallum,1986). |  | | Journal (article/letter/editorial) | | northwesttrendingbandon the northeastsideof Bear Creek Valley in the Medford Quadranglewhere it generallystrikes...greenstoneand schist,and one (Mammoth Lode) with the May Creek schist. Associated IntrusiveRocks. Intrusiverocksoutcropnear...(Silver Peak mines.) Magnification 48 X. Fxa. 3. Pyrrhotite (Pr) automorphically replacing quartz I,Q). (Waldo...replacementof pyrrhotite (Pr) developsrounded grain. Chalcopyrite (Cp) replaces pyrrhotite along a fracture...fracture (Fall Creek Coppermine.) Magnification48 X. Fxg. 5. Bornite (Bo) and chalcopyrite(Cp) reversiblerelationships |  | | Report (issue) | | Custer and Gallatin National Forests, South-Central Montana compiled by Bradley S. Van Gosen1 Open-File Report...references ...................................... 5 I. Stillwater Complex .......................................Absaroka-Beartooth study area in south-central Montana ... 4 INTRODUCTION This bibliography lists more...Mountains and Absaroka Range in south-central Montana. It was compiled during an evaluation of the mineral...ABSA, The 12 categories are: I. Stillwater Complex. The Stillwater Complex (fig. 1) is a geologically |  | Todd, S. G., Keith, D. W., Le Roy, L. W., Schissel, D. J., Mann, E. L., Irvine, T. N. (1982) The J-M platinum-palladium reef of the Stillwater Complex, Montana; I, Stratigraphy and petrology. Economic Geology, 77 (6) 1454-1480 doi:10.2113/gsecongeo.77.6.1454 | Journal (article/letter/editorial) | | KEITH, L. W. LE RoY, Stillwater PGM Resources, 1826 Grand Avenue,Billings,Montana 59102 D. J. SCHISSEL...SCHISSEL, Department of Geology,Universityof Montana, Missoula,Montana 59812 E. L. MANN, Manville International...small concentrations (0.5-1.0%) of chalcopyrite,pyrrhotite,and pentlanditcin which are containedtiny grainsof...0861-0128/82/77/1454-2752.50 1454 J-M REEF, STILLWATER COMPLEX 1455 reachedcontinuous saturationwith...Unconformlty :+•*-1Granitlc Intrusions iOetgJ•'--J Stillwater Complex • Metamorphic rocks • Fault • Thrust |  | | Report (issue) | | Sulfur Isotopic Studies of the Stillwater Complex and Associated Rocks, Montana Michael L. Zientek1 and Edward...Bloomington, IN 47405 ABSTRACT The Stillwater Complex, in south-central Montana, is a Late Archean layered,...of sulfur in metamorphosed sedimentary rocks, Stillwater-associated sills and dikes, sulfide accumulations...metashale (mean 2.8 per mil); 2) iron-formation, Stillwater-associated sills and dikes, and basal sulfide...that occur above the basal accumulations in the Stillwater Complex (mean 1.2 per mil). The isotopic composition |  | | 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) | | J-M Reef and Associated Rocks of the Stillwater Complex, Montana ALAN BOUDREAU∗ DEPARTMENT OF GEOLOGY...GEOLOGY, DUKE UNIVERSITY, BOX 90227, DURHAM, NC 27708, USA RECEIVED MAY 5, 1998; REVISED TYPESCRIPT ACCEPTED...principal platinumgroup element deposit of the Stillwater complex, the J-M reef. OB I is characterized...crystallized layered igneous intrusions such as the Stillwater complex have traditionally been considered to...that the highCl, high-Mg parent liquids of the Stillwater and Bushveld complexes, like their modern-day |  | | Journal (article/letter/editorial) | | associations with elevated sulfur fugacities, pyrrhotite (mss) appears to be a principal solid-state collector...accelerated decrease in Pd solubility values in pyrrhotite is observed at any temperature where the Fe1–xS...Considering the fact that in geological conditions pyrrhotite continues reequilibrating according to the immediate...Laflamme (1974) found up to 1.5 wt.% Pd in the Stillwater pentlandite material, whereas Todd et al. (1982)...analysis of pentlandite from the J-M Reef of the Stillwater Complex with up to 3.3 wt.% Pd, and an average |  | | Book | | Subsequent work by H.H. Hess and E.D. Jackson (Stillwater) and B.V. Lombaard (Bushveld) revealed problems...cycles. Similar cyclic units are present in the Stillwater, Great Dyke, Bushveld, Rum, Jimberlana, and other...the Merensky and J-M reefs in the Bushveld and Stillwater intrusions respectively, has also received much...proposed for the formation of cyclic units in the Stillwater intrusion in which each cyclic unit begins with...diffusively stratified magma (Wilson, 1992). In the Stillwater intrusion, it has been proposed that individual |  | | Report (issue) | | England Moscow, Russia London, Ontario Butte, Montana Modena, Italy Cape Town, Republic of South Africa...emplacement and solidification of the Stillwater Complex (Montana) are described and discussed by Zientek...Reef in the currently producing mines of the Stillwater Mining Company. The PGE mineralization in the...Platinum-Group Element Mineralization in the Stillwater Complex, Montana M.L. Zientek, R.W. Cooper, S.R. Corson...Barnes and Maier; Cawthorne et al., this volume), Stillwater Complex in United States (Zientek et al., this |  | | Book (volume) | | ASHTABULA COUNTY CONNEAUT, area pits, quarries, rd. cuts, etc.⎯cone-in-cone Calcite. CLERMONT COUNTY MILFORD...MILFORD, area creek gravels and alluvial deposits, rare⎯Diamond. CLINTON COUNTY WILMINGTON, area of Todd’s...Todd’s Ford, a mineral deposit⎯Hematite. COSHOCTON COUNTY AREA, townships of Washington, Virginia, Bedford...Keene, Mill Creek and Tuscarawas, as hard dark gray to black nodules⎯flint. CUYAHOGA COUNTY CHAGRIN FALLS...Geauga Co. line), area quarries⎯oilstone. DELAWARE COUNTY DELAWARE, area Co. exposures of blue clay, as clusters |  | | Book (volume) | | ASHTABULA COUNTY CONNEAUT, area pits, quarries, rd. cuts, etc.⎯cone-in-cone Calcite. CLERMONT COUNTY MILFORD...MILFORD, area creek gravels and alluvial deposits, rare⎯Diamond. CLINTON COUNTY WILMINGTON, area of Todd’s...Todd’s Ford, a mineral deposit⎯Hematite. COSHOCTON COUNTY AREA, townships of Washington, Virginia, Bedford...Keene, Mill Creek and Tuscarawas, as hard dark gray to black nodules⎯flint. CUYAHOGA COUNTY CHAGRIN FALLS...Geauga Co. line), area quarries⎯oilstone. DELAWARE COUNTY DELAWARE, area Co. exposures of blue clay, as clusters |  | | Book (volume) | | in elev. From 1,000’ on the eastern border with Montana and Iowa to 3,500’ along the western boundary with...beds, excavations, etc.Selenite roses. BRULE COUNTY AREA: in the Oacoma zone of the Pierre Fm. On Elm...gray Barite rosette up to 5 or 6 inches. CAMPBELL COUNTY MOUND CITY, W to the Missouri R., regional hillsides...gravels, etc.petrified wood, wood opal. CORSON COUNTY LITTLE EAGLE: area ridges, slopes, stream beds...Guide for Rock Hounds in the United States CUSTER COUNTY AREA: The November Mine, 1.2 mi. SE of the Needles |  | | Report (issue) | | GEOLOGY AND MINERAL RESOURCES OF JOSEPH_INE COUNTY, OREGON 1979 STATE OF OREGON DEPARTMENT OF GEOLOGY...100 GEOLOGY AND. MINERAL RESOURCES OF JOSEPHINE COUNTY, OREGON By LEN RAMP, Resident Geologist and NORMAN...030 Funded in part with a grant from Josephine County Board of Commissioners STATE GEOLOGIST GOVERNING...on California-Oregon line in headwaters of Blue Creek is pinkish-orange and should be tan. 2. Small lenticular...bluish gray of R. as. 4. Small patch north of Deer Creek mostly in SW* sec. 11, T. 38 S., R. 7 W., T. 39 |
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