 | | 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...(skaergaardite) with minor native Pd, [Ru(Ir, Os)S2] (laurite), and Au-Pd-Ag alloy (palladian electrum). These...second fluid migration event. The Pd/Pt ratio of the reef (~3.3) is higher than most mafic magmas and the...of the Pd in the reef was leached from the underlying rocks and deposited in the reef as PGM associated |  | | Journal (article/letter/editorial) | | Re-Os isotopic investigation of the Stillwater Complex, Montana C.E. M a r t i n Department of Geology and...1989 Samples from the J-M Reef and the G-chromitite horizons of the Stillwater Complex were analyzed...in-situ Re decay since the time at which the Stillwater Complex formed. The lowest initial 187Os/lS6Os...intermediate in 187Os/la6Os between this value and the J-M Reef average initial 187Os//lS6Os of 1.32 + 0.10. The...phases, predominantly laurite (Ru, Os, Ir)S2). Oxygen isotopic analyses of the J-M Reef indicate that the |  | 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...the sulfide mineralization in the J-M reef horizon of the Stillwater Complex along the strike and down...down the dip of the deposit in the area of the Stillwater mine. We compare these results with data from...the composition of the reef sulfides in different spatial domains of the Stillwater mine area and between |  | Marcantonio, Franco, Zindler, Alan, Reisberg, Laurie, Mathez, E.A. (1993) Re-Os isotopic systematics in chromitites from the Stillwater Complex, Montana, USA. Geochimica et Cosmochimica Acta, 57 (16) 4029-4037 doi:10.1016/0016-7037(93)90351-v | Journal (article/letter/editorial) | | syste~~ti~s in ~hro~tites from the Stillwater Complex, Monks + .OO USA FRANCO MARCANTONIO,’ ALAN ZINDLER...Observatory ofColumb~a University, Palisades, NY 10964, USA 2Department of Mineral Sciences, American Museum...Museum of Natural History, New York, NY 10024, USA (Received March 24, 1993; accepted in revised form May 27...Abstract-New Re-0s isotopic data on chromitites of the Stillwater Complex demonstrate isotopic equilibrium between...observed in chromitites and other rocks from the Stillwater Complex could result from interaction with these |  | | Journal (article/letter/editorial) | | whole rocks of the J-M Reef (Stillwater Complex): Implication for the formation of the reef Bélinda Godel...and whole rocks of the J-M Reef (footwall, reef and hanging wall) of the Stillwater Complex (U.S.A.). The...the role of alteration in the formation of the J-M Reef. Only a minor quantity of PGE (∼ 10 to 140 ppb)...the J-M Reef, which contain only small amounts of sulfur (∼ 140 to 400 ppm). In contrast, the reef samples...indicate that Pd is more strongly enriched in the reef relative to surrounding rocks than the other PGE |  | | 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...deposits. K E Y WO R D S : Stillwater Complex, layered intrusions, J-M Reef, platinum-group element deposits |  | Aird, Hannah M., Ferguson, Katherine M., Lehrer, Malia L., Boudreau, Alan E. (2017) A study of the trace sulfide mineral assemblages in the Stillwater Complex, Montana, USA. Mineralium Deposita, 52 (3) 361-382 doi:10.1007/s00126-016-0664-x | Journal (article/letter/editorial) | | assemblages in the Stillwater Complex, Montana, USA Hannah M. Aird 1,2 & Katherine M. Ferguson 1 & Malia...2016 Abstract The sulfide assemblages of the Stillwater Complex away from the well-studied ore zones...assemblages are mainly found within and below the J-M reef, where native copper and sphalerite are also locally... and the same trend repeats from just below the reef and continues into the overlying N-II and GN-II...Modeling suggests that the sulfide Editorial handling: M. Fiorentin Electronic supplementary material The online |  | 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) | | Geochemistry of the Stillwater Complex, Montana: Implications for the Petrogenesis of the J-M Reef 1 2 4 Victorian...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 |  | | Journal (article/letter/editorial) | | mechanisms and post-formational redistribution BRONWEN M. COGHILL AND ALLAN H. WILSON Department of Geology...(sperrylite); and sulphides and sulpharsenides (cooperite, laurite, braggite and hollingworthite). Platinum Group...(~ Copyright the Mineralogical Society 614 B. M. C O G H I L L A N D A. H. WILSON or whether transport...the margin and increasing to a thickness of 9-10 m in the axis (Fig. 2b). The generally medium-grained...accessory titanite, apatite and zircon. The 'potato reef' is the name given to websterite and bronzitite |  | | Journal (article/letter/editorial) | | Merensky Reef in the Rustenburg section of the Bushveld Complex D . M . Nicholson i * and E.A. M a t h e...98195 USA 2 Department of Mineral Sciences,AmericanMuseum of Natural History,New York, NY 10024 USA Received...Abstract. A petrogenetic model for the Merensky Reef in the Rustenburg section of the Bushveld Complex...electron microprobe data. The model maintains that the reef formed by reaction of hydrous melt and a partially...feldspathic pyroxenite, there is a continuous range of reef lithology from pyroxenite to pegmatoidal harzburgite |  | Barkov, A. Y., Fleet, M. E., Martin, R. F., Halkoaho, T. A.A. (2005) New data on "Bonanza"-type PGE mineralization in the Kirakkajuppura PGE deposit, Penikat layered complex, Finland. The Canadian Mineralogist, 43 (5) 1663-1686 doi:10.2113/gscanmin.43.5.1663 | Journal (article/letter/editorial) | | unusual micro-aggregates), laflammeite [Pd3Pb2S2], laurite–erlichmanite series [(Ru,Os,Ir)(S,As)2 – (Os,Ru...[Pd–Pt zones associated with the low-sulfide SJ reef and Ru–Os-mineralized chromitite zones], resulting...inhabituels), laflammeïte [Pd3Pb2S2], membres de la série laurite–erlichmanite [(Ru,Os,Ir)(S,As)2 – (Os,Ru,Ir)(S...forms part of the sulfide-poor Sompujärvi (SJ) PGE reef, located at the boundary between the MCU III and...of minute vysotskite–braggite grains (up to 5–10 m each) are observed. A broad 1665 compositional range |  | | Journal (article/letter/editorial) | | Petrology © by Springer-Verlag 1990 The Sompuj irvi PGE Reef in the Penikat Layered Intrusion, Northern Finland...and J. J. Lahtinen 2 1Department of Geology, University of Oulu, Oulu, Finland, 2 0 u t o k u m p u Oy...December 14, 1989 Summary The Sompujfirvi (SJ) PGE Reef is located at the border between the third and fourth...d type within the SJ Reef was formed. Zusammenfassung Das Sompujiirvi PGE Reef in der Penikat-Intrusion...Sompuj/irvi (SJ) PGE Reef liegt im Grenzbereich von Megazyklus III und IV, 400 1000 m oberhalb der Basis |  | | Journal (article/letter/editorial) | | intergrowth as evidence of desulfurization in the Merensky Reef at Rustenburg (western Bushveld Complex, South Africa)...samples of the Normal (or undisturbed) Merensky Reef from Frank Shaft No.1 at Rustenburg Platinum Mine...petrographic results indicate that the normal thin reef has also undergone hydrothermal alteration. For...even in the undisturbed Merensky Reef. K E Y WO R D S : Merensky Reef, Bushveld Complex, platinum-group...Pt-Fe-alloy, desulfurization. Introduction THE Merensky Reef, a thin and laterally extensive platinum-group element |  | Wilhelm, H. J., Zhang, H., Chen, F. L., Elsenbroek, J. H., Lombard, M., de Bruin, D. (1997) Geochemical exploration for platinum-group elements in the Bushveld Complex, South Africa. Mineralium Deposita, 32 (4) 349-361 doi:10.1007/s001260050101 | Journal (article/letter/editorial) | | Wilhelm á H. Zhang á F.L. Chen á J.H. Elsenbroek M. Lombard á D. de Bruin Geochemical exploration for...concentrated in three distinct reefs, i.e. the Merensky Reef, the UG-2 chromitite seam and the Platreef. Signi®cant...G. Eriksson H.J. Wilhelm (&) á J.H. Elsenbroek á M. Lombard á D. de Bruin Council for Geoscience, Private...signi®cant PGE mineralisation within the Merensky Reef and UG-2 chromitite seam is known to exist. A pilot...pro®le 1. Distance in km from the Merensky Reef (MR, Merensky Reef; UG-2, UG-2 chromitite seam) Pilot study |  | | Journal (article/letter/editorial) | | platinum-group-element reef deposits: examples from the Bushveld and Stillwater Complexes Eduardo T. Mansur...Barnes, S-J., The role of Te, As, Bi, Sn and Sb during the formation of platinum-group-element reef deposits:...deposits: examples from the Bushveld and Stillwater Complexes, Geochimica et Cosmochimica Acta (2020), doi:...platinum-group-element reef deposits: examples from the Bushveld and Stillwater Complexes Authors: *Eduardo...and Stillwater Complexes are reported. The samples are from: the Merensky Reef (Bushveld), the J-M Reef |  | | Journal (article/letter/editorial) | | ARTICLE The Lower Banded series of the Stillwater Complex, Montana: whole-rock lithophile, chalcophile,...rock types of the Lower Banded series of the Stillwater Complex are gabbronorite and norite with minor...Pd and Pt are enriched in a layer known as the J-M Reef which occurs in a zone containing olivine-bearing...the rocks above and below OB I. In particular, the reef rocks show no additional signs of continental crust...such as additional Th or LREE enrichment, and the reef rocks are not enriched in incompatible elements |  | Locmelis, M., Barnes, S. J., Pearson, N. J., Fiorentini, M. L. (2009) Anomalous Sulfur-Poor Platinum Group Element Mineralization in Komatiitic Cumulates, Mount Clifford, Western Australia. Economic Geology, 104 (6) 841-855 doi:10.2113/gsecongeo.104.6.841 | Journal (article/letter/editorial) | | Western Australia* MAREK LOCMELIS,1 STEPHEN J. BARNES,2 NORMAN J. PEARSON,1 AND MARCO L. FIORENTINI3 1 GEMOC...Western Australia, within the lower part of a 1,000-m-thick komatiitic dunite body. The host body consists...located in essentially sulfide free serpentine 2 m below the peak in sulfide abundance and can be categorized...this is inconsistent with current models for offset-reef PGE concentrations which involve the onset of sulfide...associated with either (1) chromitites (e.g., the UG-2 reef of the Bushveld Complex (Cawthorn, 1999; Cawthorn |  | | Journal (article/letter/editorial) | | Nelson Lead isotopes in sul®des from the Stillwater Complex, Montana: evidence for subsolidus remobilization...suite of samples from the platiniferous J-M Reef of the Stillwater Complex were measured to elucidate the...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...chemical disturbance since their formation. The Stillwater Complex has been described in a recent review |  | Maier, W. D., Barnes, S.-J., Groves, D. I. (2013) The Bushveld Complex, South Africa: formation of platinum–palladium, chrome- and vanadium-rich layers via hydrodynamic sorting of a mobilized cumulate slurry in a large, relatively slowly cooling, subsiding magma chamber. Mineralium Deposita, 48 (1) 1-56 doi:10.1007/s00126-012-0436-1 | Journal (article/letter/editorial) | | cooling, subsiding magma chamber W. D. Maier & S.-J. Barnes & D. I. Groves Received: 25 November 2011... Oulu, Finland e-mail: wolfgang.maier@oulu.fi S.-J. Barnes Sciences de la Terre, Université du Québec...conducted a detailed compositional study on the 3,000-m Bellevue drill core through the Main and Upper Zones...al. (2005) added Nd isotopic data on the Merensky Reef at Impala mine. Comprehensive Pb isotope studies...individual reefs were provided by Lee (1983: Merensky Reef, Rustenburg Platinum Mine), Hiemstra (1986: UG2 |  | | Journal (article/letter/editorial) | | ScienceDirect Lithos j o u r n a l h o m e p a g e : w w w. e l s ev i e r. c o m / l o c a t e / l i...horizons at different stratigraphic heights. A ~ 5 m-thick PGE-rich horizon at the base of the sill, which...layered intrusions, such as the Bushveld and Stillwater Complexes and the Great Dyke (Naldrett, 2004)...chromitite, such as the chromite layers of the Merensky Reef (Barnes and Maier, 2002; ⁎ Corresponding author... 2007) and chromite-poor J-M reef and A and B chromitites of the Stillwater Complex (Page et al., 1985; |  | | Journal (article/letter/editorial) | | Noble Metal Enrichment Processes in the Merensky Reef, Bushveld Complex CHRIS BALLHAUS1,2∗ AND PAUL SYLVESTER1†...sulphides, silicates, and chromites of the Merensky Reef for platinum-group elements (PGEs), Re and Au using...the silicate melt layer that preceded the Merensky Reef was PGE oversaturated at early cumulus times. Experiments...role in enriching the noble metals in the Merensky Reef; rather, its role was to immobilize a pre-existing...chamber. INTRODUCTION Bushveld Complex; Merensky Reef; laser-ablation ICPMS; platinum-group mineralization |  | Chutas, N. I., Bates, E., Prevec, S. A., Coleman, D. S., Boudreau, A. E. (2012) Sr and Pb isotopic disequilibrium between coexisting plagioclase and orthopyroxene in the Bushveld Complex, South Africa: microdrilling and progressive leaching evidence for sub-liquidus contamination within a crystal mush. Contributions to Mineralogy and Petrology, 163 (4) 653-668 doi:10.1007/s00410-011-0691-7 | Journal (article/letter/editorial) | | Duke University, Box 90227, Durham, NC 27708-0227, USA e-mail: boudreau@duke.edu S. A. Prevec Department...Mitchell Hall, CB#3315, Chapel Hill, NC 27599-3315, USA Sri = 0.70654 (36) with calculated l2 of 10.32 for...in relatively narrow zones, such as the Merensky Reef, which have a mining thickness that is sub-meter...immediately underlying the mineralized J-M Reef of the Stillwater Complex, for example. It should be noted...significant magmamixing zone above the Merensky-Bastard Reef megacyclic unit, which marks the transition from |  | Bai, W., Robinson, P. T., Fang, Q., Yang, J., Yan, B., Zhang, Z., Hu, X.-F., Zhou, M.-F., Malpas, J. (2000) THE PGE AND BASE-METAL ALLOYS IN THE PODIFORM CHROMITITES OF THE LUOBUSA OPHIOLITE, SOUTHERN TIBET. The Canadian Mineralogist, 38 (3) 585-598 doi:10.2113/gscanmin.38.3.585 | Journal (article/letter/editorial) | | monophase minerals or composite grains associated with laurite (RuS2), erlichmanite (OsS2), silicates or PGE–BM...The outlined field represents compositions of laurite and erlichmanite from Kempirsai, southwestern Oregon...typically associated with PGE sulfides (e.g., laurite– erlichmanite). Those alloys interpreted as being...composition to the porous, Ru-rich alloys and the laurite–erlichmanite grains in Kempirsai (Melcher et al...believed to have formed by desulfurization of primary laurite during serpentinization (Stockman & Hlava 1984) |  | | Report (issue) | | Beneficiation of Platinum-Group Elements Edited by Louis J. Cabri Ottawa, Ontario Published for the Geological...England Moscow, Russia London, Ontario Butte, Montana Modena, Italy Cape Town, Republic of South Africa...recent work on the contact-type and magnetitite reef-type mineralization in ferroan olivine gabbros,...types of mineralization such as the Merensky Reef, the UG2 Reef, the Platreef, the Main Magnetitite, and...emplacement and solidification of the Stillwater Complex (Montana) are described and discussed by Zientek |  | | Report (issue) | | 569/PIO/ADB/1988 By: Michael L. Zientek1 and Norman J Page2 OPEN-FILE REPORT 90-527 Report prepared by...99201 2U.S. Geological Survey, Tucson, AZ 85705, USA 1990 5/14/91 TABLE OF CONTENTS Executive Summary...electron images of Pt-Fe alloy with inclusions of laurite from S. Pedohon, Tabang area, East Kalimantan....Back-scattered and secondary electron images of laurite, S. Pirik area, South Kalimantan. 5/14/91 Figure...Kodak spectrum analysis No. 1 i. Developer - D -19 j. Gas: 70 percent argon / 30 percent oxygen mixture |
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