 | | Journal (article/letter/editorial) | | ALTERATION AND MINERALIZATION IN THE J–M REEF, STILLWATER COMPLEX, MONTANA JOSEPH S. POLOVINA 1254 Wonder Court...Court, Gardnerville, Nevada 89460, U.S.A. DONALD M. HUDSON 1540 Van Petten Street, Reno, Nevada 89503...borehole samples from the J–M Reef and its footwall in the Stillwater Complex, Montana. We used optical microscopy...BMS identified are pyrrhotite, chalcopyrite, pentlandite and minor pyrite. Thirty-six grains of PGM were...altered in the least-altered reef sample. In the weakly altered samples of the reef, BMS occur in aggregates |  | 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 |  | | 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...establish: (i) whether the BMS minerals (pyrrhotite, pentlandite, and chalcopyrite) are the principal host of...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 |  | Bow, C., Wolfgram, D., Turner, A., Barnes, S., Evans, J., Zdepski, M., Boudreau, A. (1982) Investigations of the Howland Reef of the Stillwater Complex, Minneapolis Adit area; stratigraphy, structure, and mineralization. Economic Geology, 77 (6) 1481-1492 doi:10.2113/gsecongeo.77.6.1481 | Journal (article/letter/editorial) | | Investigations of the Howland ReefI of the StillwaterComplex,Minneapolis Adit Area: Stratigraphy,Structure...Mineralization C. Bow, D. WOLFGRAM,A. TURNER,S. BARNES,J. EVANS,M. ZDEPSKI,AND A. BOUDREAU AnacondaCopperCompany...depositoccurswithin the lower part of the banded zoneof the Stillwater Complex, a layered, tholeiitic intrusionof Archcanage...Archcanage. The zone of platinum concentration, the Howland reef, is coincidentwith the reappearanceof olivine...the composition and thickness of the Howland reefareevidentover700 m of underground development. Therearesuperimposed |  | | Journal (article/letter/editorial) | | OF THE J-M REEF PLATINUM GROUP ELEMENT DEPOSIT IN THE STILLWATER COMPLEX, MONTANA (USA) Corey J. Wall†... BC V6T-1Z4, Canada Abstract The Stillwater Complex, Montana (USA), is one of the world’s largest layered...layered intrusions and hosts the JohnsManville (J-M) Reef, a world-class platinum group element (PGE) deposit...extracted from three mineralized samples of the J-M Reef. The samples, which were collected over 15 km...high-precision crystallization ages for the reef and the Stillwater Complex. All samples are coarse grained |  | | 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...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...Bushveld Complex (South Africa) and the Stillwater Complex (Montana) contain stratiform layers, or “reefs |  | | Report (issue) | | Kojonenite Crystal Data: Tetragonal. Point Group: 4/m 2/m 2/m. Physical Properties: Cleavage: n.d. D(meas.)...63.1 11.7 24.7 100.0 (1) Howland Reef, Stillwater Complex , Montana, USA; average of 20 electron microprobe...cubanite, pentlandite, and pyrrhotite. Distribution: From the first crosscut of the Minneapolis adit, Howland...Howland Reef, lower part of the Banded zone, Stillwater Complex, Montana, USA. Name: Honors Kari K. Kojonen...telluride mineral from the Stillwater Layered Igneous Intrusion, Montana, U.S.A. Amer. Mineral., 100 |  | 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) | | secondary pyrite above and below the J-M Reef, Stillwater Complex, Montana B.W. Wernette, E.M. Ripley, C....secondary pyrite above and below the J-M Reef, Stillwater Complex, Montana. The address for the corresponding...Secondary Pyrite Above and Below the J-M Reef, Stillwater Complex, Montana IP T Wernette, B.W.1†, Ripley...Indiana University, Bloomington, Indiana 47405, USA US †– current address: Division of Earth and Ocean...Carolina 27708, USA AC CE PT ED M AN Keywords: Sulfur isotopes, Stillwater Complex, J-M Reef, secondary |  | | Journal (article/letter/editorial) | | telluride mineral from the Stillwater Layered Igneous Intrusion, Montana, U.S.A.†k Chris J. Stanley1,* and Anna...specimens from the Stillwater Layered Igneous Intrusion, Stillwater Valley, Montana, U.S.A. (45°23′11′′N...telluride, new mineral, layered intrusion, Howland Reef, Stillwater Complex Introduction Kojonenite, is a...of the Minneapolis Adit, Howland Reef of the Stillwater Layered Igneous Intrusion, Stillwater Valley...Valley, Montana, U.S.A. (45°23′11′′N and 109°53′03′′W). The Howland Reef is a platinum-group mineral deposit |  | | Journal (article/letter/editorial) | | Saini-Eidukat 1, P. W. Weiblen l, G. Bitsianes 2, and M. D. Glascock 3 1Newton Horace Winchell School of Earth...Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota, U.S.A., 2 Mineral Resources Research...Research Center, University of Minnesota, Minneapolis, Minnesota, U.S.A., 3 Reactor Research Facility, University...textures and the sulfide assemblage (pyrrhotite, pentlandite and chalcopyrite) are similar to the sulfide...different biotite compositions reported from the Stillwater and Bushveld Complexes. Zusammenfassung Unterschiede |  | | 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 |  | | Journal (article/letter/editorial) | | Petrology © by Springer-Verlag 1990 The Paasivaara PGE Reef in the Penikat Layered Intrusion, Northern Finland...Finland T. A. Huhtelin 1, T. T. Alapieti 1, and J. J. Lahtinen 2 Department of Geology, University of Oulu...initial discovery. The uppermost of these, the PV Reef, has the highest Pt/Pd ratio. It is located in the...interstices of this plagioclase orthocumulate. The Reef has also been encountered in other parts of the...sulphide paragenesis is chalcopyrite-pyrrhotite-pentlandite, whereas the PGM identified are represented by |  | Ripley, Edward M., Wernette, Benjamin W., Ayre, Annie, Li, Chusi, Smith, Joshua M., Underwood, Benjamin S., Keays, Reid R. (2017) Multiple S isotope studies of the Stillwater Complex and country rocks: An assessment of the role of crustal S in the origin of PGE enrichment found in the J-M Reef and related rocks. Geochimica et Cosmochimica Acta, 214. 226-245 doi:10.1016/j.gca.2017.07.041 | Journal (article/letter/editorial) | | Manuscript Multiple S isotope studies of the Stillwater Complex and country rocks; An assessment of the...origin of PGE enrichment found in the J-M Reef and related rocks Edward M. Ripley, Benjamin W. Wernette, Annie...Annie Ayre, Chusi Li, Joshua M. Smith, Benjamin S. Underwood, Reid R. Keays PII: DOI: Reference: S0016-7037(17)30465-9...Keays, R.R., Multiple S isotope studies of the Stillwater Complex and country rocks; An assessment of the...S in the origin of PGE enrichment found in the J-M Reef and related rocks, Geochimica et Cosmochimica |  | 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...variable proportions of pyrrhotite, chalcopyrite, pentlandite, and ±pyrite. Excluding vein assemblages and...assemblages are mainly found within and below the J-M reef, where native copper and sphalerite are also locally...no silicate alteration. An upward trend from pentlandite-rich to pyrrhotite-rich to pyrite-rich assemblages |  | | Report (volume) | | Gabbronoritic Rocks below the J-M Reef in the Mountain View Area, Stillwater Complex, Montana U.S. GEOLOGICAL SURVEY...Rocks below the J-M Reef in the Mountain View Area, Stillwater Complex, Montana By NORMAN J PAGE and BARRY...Data Page, Norman, J Petrology of the noritic and gabbronoritic rocks below the J-M Reef in the Mountain...Mountain View area, Stillwater Complex, Montana / by Norman J Page and Barry C. Moring. p. cm. (U.S. Geological...Moring, Barry C. II. Title. III. Title: Stillwater Complex, Montana. IV. Series. V. Series: Contributions |  | | Report (volume) | | Inclusions Within the B Chromitite, Stillwater Complex, Montana U.S. GEOLOGICAL SURVEY BULLETIN 1674-D...Inclusions Within the B Chromitite, Stillwater Complex, Montana By MICHAEL P. FOOSE and SUZANNE W. NICHOLSON...inclusions within the B chromitite of the Stillwater Complex, Montana, provide evidence for complex high-temperature...inclusions within the B chromitite, Stillwater Complex, Montana. (U.S. Geological Survey bulletin ; 1674-D)...Bibliography: p. 1. Sulfide minerals Montana. 2. Mineralogy Montana. SuzanneW. II. Title. III. Series. |  | | Journal (article/letter/editorial) | | tomography; microstructures; sulphides; Merensky Reef; J-M Reef Large mafic–ultramafic layered intrusions...in two oriented samples of the Merensky Reef and the J-M Reef. The aim of the study was to test the hypothesis...and silicates or oxides. In the Merensky Reef and the J-M Reef, sulphides are connected in three dimensions...the cumulate. In the melanorite of the Merensky Reef, the sulphide content increases from top to bottom...Bushveld Complex (South Africa) or the Stillwater Complex (Montana, USA) contain layers enriched in platinum-group |  | | 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,...vol.%) from the J–M Reef at the Stillwater mine and elsewhere along the strike of the reef. The occurrence...occurrence of original chalcopyrite and pentlandite inclusions in altered Pt–Pd sulfide suggests that this Pt–Pd |  | 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) | | of Cumulates: the J-M Reef and Associated Rocks of the Stillwater Complex, Montana ALAN BOUDREAU∗ DEPARTMENT...GEOLOGY, DUKE UNIVERSITY, BOX 90227, DURHAM, NC 27708, USA RECEIVED MAY 5, 1998; REVISED TYPESCRIPT ACCEPTED...platinumgroup element deposit of the Stillwater complex, the J-M reef. OB I is characterized by a lower...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 |  | 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) | | Department of Geology, University of Minnesota, Minneapolis *U.S. Geological Survey, Res ton, Virginia. ...= = = = = = nickel or cobalt or platinum or pentlandite mineralization or ore deposit or dissemination... 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 |  | | Journal (article/letter/editorial) | | ARTICLE Sulfide saturation history of the Stillwater Complex, Montana: chemostratigraphic variation in platinum...km-thick stratigraphic section of the Stillwater Complex, Montana was undertaken to refine and test a geochemical...the western part of the Stillwater Complex where the J-M reef occurs ∼1,460 m above the floor of the intrusion...of the J-M reef were analyzed to detail compositional variations directly above and below the J-M reef...reef. Below the J-M reef, background concentrations of Pt (10 ppb) and Pd (7 ppb) are features of peridotites |  | | Journal (article/letter/editorial) | | Sulfide and platinum mineralization in the Merensky Reef: evidence from hydrous silicates and fluid inclusions...Abstract. The base metal sulfides of the Merensky Reef are associated with hydrous silicates and intense...have thus far not been described from the Merensky Reef. The earliest fluid inclusion compositions are NaCI-(H20)...intercumulus stage of the crystallizing Merensky Reef is directly related to the mode of sulfide precipitation...pattern of platinum-group minerals in the Merensky Reef better than any orthomagmatic mineralization concept |  | 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 |  | | Report (issue) | | Studies of the Stillwater Complex and Associated Rocks, Montana Michael L. Zientek1 and Edward M. Ripley2 ...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...(PGE)-enriched sulfide mineralization that constitutes the J-M Reef and the Picket Pin deposit. The 834s values for...metashale (mean 2.8 per mil); 2) iron-formation, Stillwater-associated sills and dikes, and basal sulfide |
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