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The Stillwater Complex, Montana – Overview and the significance of volatiles

Published online by Cambridge University Press:  02 January 2018

Alan E. Boudreau
Alan E. Boudreau*
Affiliation:
Division of Earth and Ocean Sciences, Duke University, Box 90227, Durham, NC 27708, USA
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Abstract

The geology of the 2.7 Ga Stillwater Complex in South-Central Montana is reviewed with a focus on the role of volatiles in locally modifying both the crystallization sequence of the evolving parent magma and the initially precipitated solid assemblages to favour olivine ± chromite. A secondary origin for these two minerals is particularly probable for the olivine-bearing rocks of the Banded series and, at a minimum, also increasing their modal abundance in the Peridotite zone of the Ultramafic series. Direct evidence for volatiles includes the presence of high-temperature fluid inclusions in pegmatoids and hydrous melt inclusions (now crystallized) in chromite and olivine from both the Ultramafic and the Banded series rocks. Indirect evidence includes the boninitic character of the parent magma, the presence of volatile-bearing minerals including high-temperature carbonates, rock textures, and Cl / F variations in apatite. Mechanisms which favour the formation of olivine (± chromite) over pyroxene include volatile phase boundary shifts induced by added H2O, incongruent melting of pyroxene by hydration of a partly-molten mush, and the near- to sub-solidus replacement of pyroxene by olivine and chromite by silica-undersaturated fluids. These mechanisms cast doubt that magmas with different liquid lines of descent were involved in the crystallization of the Stillwater Complex. A dry Stillwater magma would have been mineralogically and modally much less varied and lacking in high-grade platinum-group element and chromium deposits.

Keywords

Stillwater Complexlayered intrusionsJ-M Reefplatinum-group element deposits
Type
Research Article
Information
Mineralogical Magazine , Volume 80 , Issue 4 , June 2016 , pp. 585 - 637
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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References

Abbott, D.M.Jr., Bullock, R.L., Gibbs, B. and Kunter, R.S. (2011) Technical report for the mining operations at Stillwater Mining Company, Stillwater Mine, 45°23’ N, 109°53'W, East Boulder Mine, 45°30'N, 109°05’ W: Denver, Colorado, Behre Dolbear & Company Ltd., Project 11-030, 87 pp. URL: http://secfilings. nyse.com/filing.php?ipage=7682024.Google Scholar
Aird, H.M. and Boudreau, A.E. (2013) High-temperature carbonate minerals in the Stillwater Complex, Montanaa, USA. Contributions to Mineralogy and Petrology, 166, 1143–1160.CrossRefGoogle Scholar
Aird, H.M., Ferguson, K.M., Lehrer, M.L. and Boudreau, A.E. (2016) A study of the trace sulfide mineral assemblages in the Stillwater Complex, Montanaa. Mineralium Deposita, doi: 10.1007/s00 126-016-0664-x.CrossRefGoogle Scholar
Armitage, G.J. (1992) The petrogenesis of potholes in the UG2 chromitite layer, Crocodile River Mine, Western Bushveld complex., Unpublished PhD dissertation, University of Natal, Pietermaritzburg South Africa.Google Scholar
Bachmann, O. and Bergantz, G.W. (2006) Gas percolation in upper-crustal silicic crystal mushes as a mechanism for upward heat advection and rejuvenation of near-solidus magma bodies. Journal of Volcanology and Geothermal Research, 149, 85–102.CrossRefGoogle Scholar
Barnes, S.J. and Campbell, I.H. (1988) Role of late magmatic fluids in Merensky-type platinum deposits: a discussion. Geology, 16, 488–491.2.3.CO;2>CrossRefGoogle Scholar
Barnes, S.J. andNaldrett, A.J. (1985) Geochemistry of the J-M (Howland) Reef of the Stillwater Complex, Minneapolis Adit Area. I. Sulfide chemistry and sulfide-olivine equilibrium. Economic Geology, 80, 627–645.CrossRefGoogle Scholar
Barnes, S.J. andNaldrett, A.J. (1986) Geochemistry of the J-M Reef of the Stillwater Complex, Minneapolis Adit Area II. Silicate mineral chemistry and petrogenesis. Journal of Petrology, 27, 791–825.CrossRefGoogle Scholar
Barnes, S.-J., Pagé, P., Prichard, H.M., Zientek, M.L. and Fisher, P.C. (2015) Chalcophile and platinum-group element distribution in the Ultramafic series of the Stillwater Complex, MT, USA - implications for processes enriching chromite layers in Os, Ir, Ru, and Rh. Mineralium Deposita, 51, 25—47.Google Scholar
Boorman, S., Boudreau, A.E. and Kruger, F.J. (2004) The Lower zone - Critical Zone transition of the Bushveld Complex: A quantitative textural study. Journal of Petrology, 45, 1209–1235.CrossRefGoogle Scholar
Boudreau, A.E. (1986) The role of fluids in the petrogenesis of platinum-group element deposits in the Stillwater Complex, Montanaa., Unpublished PhD dissertation, University of Washington, Seattle USA.Google Scholar
Boudreau, A.E. (1987) Pattern formation during crystallization and the formation of fine-scale layering. Pp. 453—471 in: Origins of Igneous Layering, (I. Parsons, editor). NATO ASI Series, Series C: Mathematical and Physical Sciences,Vol. 186. Kluwer Academic, Dordrecht The Netherlands.Google Scholar
Boudreau, A.E. (1988) Investigations of the Stillwater Complex: Part IV. The role of volatiles in the petrogenesis of the J-M Reef, Minneapolis adit section. The Canadian Mineralogist, 26, 193—208.Google Scholar
Boudreau, A.E. (1992) Volatile fluid overpressure in layered intrusions and the formation of potholes. Australian Journal of Earth Sciences, 39, 277–287.CrossRefGoogle Scholar
Boudreau, A.E. (1994) Pattern formation during crystallization in two crystal, two component systems. South African Journal of Geology, 97, 473—485.Google Scholar
Boudreau, A.E. (1995) Crystal aging and the formation of fine-scale layering. Mineralogy and Petrology, 54, 55–69.CrossRefGoogle Scholar
Boudreau, A.E. (1999) Fluid fluxing of cumulates: The J-M reef and associated rocks of the Stillwater Complex, Montanaa. Journal of Petrology, 40, 755—772.CrossRefGoogle Scholar
Boudreau, A.E. (2011) The evolution of texture and layering in layered intrusions. International Geology Review, 53, 330–353.CrossRefGoogle Scholar
Boudreau, A.E., Mathez, E.A. and McCallum I.S. (1986) Halogen geochemistry of the Stillwater and Bushveld Complexes: Evidence for transport of the platinum-group elements by Cl-rich fluids. Journal ofPetrology, 27, 967–986.CrossRefGoogle Scholar
Boudreau, A.E. and McBirney, A.R. (1997) The Skaergaard Layered series. Part. III. Non-dynamic Layering. Journal ofPetrology, 38, 1003–1020.CrossRefGoogle Scholar
Boudreau, A.E. and McCallum, I.S. (1985) Features of the Picket Pin Pt-Pd deposit. Pp. 346-357 in: Stillwater Complex, Montanaa: Geology and Guide, (G.K. Czamanske and M.L. Zientek, editors). Montanaa Bureau of Mines and Geology, Special Publication, 92. Billings, Montana USA.Google Scholar
Boudreau, A.E. and McCallum, I.S. (1986) Investigations of the Stillwater Complex. Part III. The Picket Pin Pt-Pd deposit. Economic Geology, 81, 1953—1975.CrossRefGoogle Scholar
Boudreau, A.E. and McCallum, I.S. (1989) Investigations of the Stillwater Complex: Part V Apatite as indicators of evolving fluid composition. Contributions to Mineralogy and Petrology, 102, 138–153.CrossRefGoogle Scholar
Boudreau, A.E. and McCallum, I.S. (1992a) Concentration of platinum-group elements by mag-matic fluids in layered intrusions. Economic Geology, 87, 1830–1848.CrossRefGoogle Scholar
Boudreau, A.E. and McCallum, I.S. (1992b) Infiltration metasomatism in layered intrusions — An example from the Stillwater Complex, Montanaa. Journal of Volcanology and Geothermal Research, 52, 171—183.CrossRefGoogle Scholar
Boudreau, A.E., Stewart, M.A. and Spivack, A.J. (1997) Stable Cl isotopes and origin of high-Cl magmas of the Stillwater Complex, Montanaa. Geology, 25, 791–794.2.3.CO;2>CrossRefGoogle Scholar
Bow, C., Wolfgram, D., Turner, A., Barnes, S., Evans, J., Zdepski, M. and Boudreau, A.E. (1982) Investigations of the Howland reef of the Stillwater Complex, Minneapolis Adit area: Stratigraphy, structure and mineralization. Economic Geology, 77, 1481-1492.CrossRefGoogle Scholar
Braun, K., Meurer, W., Boudreau, A.E. and McCallum, I.S. (1994) Compositions of pegmatoids beneath the J-M Reef of the Stillwater Complex, Montanaa. Chemical y, 113, 245–25.Google Scholar
Brozdowski, R.A. (1985) Cumulate xenoliths in the Lodgepole, Enos Mountain and Susie Peak intrusions: a guide. Pp. 368-372 in: Stillwater Complex, Montanaa: Geology and Guide, (G.K. Czamanske and M. L. Zientek, editors). Montanaa Bureau of Mines and Geology, Special Publication 92. Billings, Montana USA.Google Scholar
Campbell, I.H. and Murck, B.W. (1993) Petrology of the G and H Chromitite Zones in the Mountain View Area of the Stillwater Complex, Montanaa. Journal of Petrology, 34, 291–316.CrossRefGoogle Scholar
Campbell, I.H., Naldrett, A.J. and Barnes, S.J. (1983) A model for the origin of the platinum-rich sulfide horizons in the Bushveld and Stillwater Complexes. Journal of Petrology, 24, 133–165.CrossRefGoogle Scholar
Cawthorn, R.G. and Walraven, F. (1998) Emplacement and crystallization time for the Bushveld Complex. Journal of Petrology, 39, 1669–1687.CrossRefGoogle Scholar
Childs, I.E, Evans, J.R., Wood, K.Y., Koski, M.S. and Evans, J.D. (2002) Some preliminary descriptive aspects of ballroom mineralization at the Stillwater palladium-platinum Mine, Stillwater Mining Company, Nye, Montanaa. Pp. 91—92 in: 9th International Platinum Symposium, Abstract with Program, 21-25 July 2002., Billings, Montana USA.Google Scholar
Chutas, N.I., Prevec, S., Bates, E. Coleman, D. and Boudreau, A.E. (2011) Pb and Sr isotopic disequilibrium between orthopyroxene and plagioclase in the Critical zone, Bushveld Complex S.. Africa. Contributions to Mineralogy and Petrology, 163, 653–668.CrossRefGoogle Scholar
Cooper, R.W. (1997) Magmatic unconformities and stratigraphic relations in the peridotite zone, Stillwater Complex, Montanaa. Canadian Journal of Earth Sciences, 34, 407–425.CrossRefGoogle Scholar
Corkery, J.T. (2002) Petrographic implications for the Picket Pin PGE deposit, Stillwater Complex, Montanaa: Pp. 97-100 in: 9th International Platinum Symposium, Abstract with Program, 21—25.July 2002., Billings, Montana USA.Google Scholar
Corkery, J.T. (2003) Petrographic observations and implications for the Picket Pin PGE deposit, Stillwater Complex, Montanaa. Geological Society of America Abstracts with Programs, 35(6), 231.Google Scholar
Corson, S.R., Childs, IE, Dahy, IP, Keith, D.W., Koski, M.S. and LeRoy, L.W. (2002) The reef package stratigraphy that contains the J-M platinum-palladium Reef ofthe Stillwater Complex, Montanaa. Pp. 101-102 in: 9th International Platinum Symposium, Abstract with Program, 21-25 July 2002., Billings, Montana USA.Google Scholar
Crawford, A.J., Fallon, T.J. and Green, D.H. (1989) Classification, petrogenesis and tectonic setting of boninites. Pp. 1-9 in: Boninites (A.J Crawford, editor). Unwin Hyman, London Google Scholar
Criscenti, L.J. (1984) The origin of macrorhythmic units in the Stillwater Complex., Unpublished MS thesis, University of Washington, Seattle USA.Google Scholar
Czamanske, G.K. and Bohlen, S.R. (1990) The Stillwater Complex and its anorthosites: an accident of magmatic underplating. American Mineralogist, 75, 37—45.Google Scholar
Czamanske, G.K. and Loferski, P.J. (1996) Cryptic trace-element alteration of anorthosite, Stillwater Complex, Montanaa. The Canadian Mineralogist, 34, 559—576.Google Scholar
Czamanske, G.K. and Scheidle, D.L. (1985) Characteristics of Banded-series anorthosites. Pp. 334-345 in: Stillwater Complex, Montanaa: Geology and Guide, (G.K. Czamanske and M.L. Zientek, editors). Montanaa Bureau of Mines and Geology, Special Publication, 92. Billings, Montana USA.Google Scholar
Czamanske, G.K. and Zientek, M.L. (editors) (1985) Stillwater Complex, Montanaa: Geology and Guide., Montanaa Bureau of Mines and Geology, Special Publication, 92. Billings, Montana USA.Google Scholar
Czamanske, G.K., Zientek, M.L. and Manning, C.E. (1991) Low-K granophyres of the Stillwater Complex, Montanaa. American Mineralogist, 76, 1646–1661.Google Scholar
Dahy, I.P, Corson, S.R., Geraghty, E.P., Koski, M.S., Langston, R.B. and Leroy, L.W. (1995) Stratigraphic relationships of the J-M Reef package within the troctolite-anorthosite zone I, Stillwater Complex, Stillwater Mine, Montanaa. Geological Society of America, Abstracts with Programs, 27, 7—8.Google Scholar
DePaolo, D.J. and Wasserburg, G.J. (1979) Sm-Nd age of the Stillwater Complex and the mantle evolution curve for neodymium. Geochimica et Cosmochimica Acta, 43, 999–1008.CrossRefGoogle Scholar
Dunn, T (1986) An investigation ofthe oxygen isotope geochemistry of the Stillwater Complex. Journal of Petrology, 27, 987–997.CrossRefGoogle Scholar
Emeleus, C.H. and Troll, V.R. (2104) The Rum Igneous Centre, Scotland. Mineralogical Magazine, 78, 805–839.CrossRefGoogle Scholar
Foose, M.P. and Nicholson, S.W. (1990) Sulfide inclu-sions within the B Chromitite, Stillwater Complex, Montanaa. U.S. Geological Survey Bulletin, 1674, D1–D21.Google Scholar
Ford, C.E., Biggar, G.M., Humphries, D.J., Wilson, G., Dixon, D. and O'Hara, M.J. (1972). Role of water in the evolution ofthe lunar crust; an experimental study of sample 14310; an indication of lunar calc-alkaline volcanism. Proceedings of the Third Lunar Science Conference, Geochimica et Cosmochimica Acta, Supplement 3, 1, 207–229.Google Scholar
Friedman, R.M., Wall, C.J., Scoates, J.S., Weis, D.A. and Meurer, W.P. (2011) Exploring the U-Pb systematics of titanite from the Archean Stillwater Complex. American Geophysical Union, Fall Meeting 2011.Abstract V51A-2504.Google Scholar
Gee, J.S., Meurer, W.P., Selkin, P.A. and Cheadle, M. (2004) Quantifying three-dimensional silicate fabrics in cumulates using cumulative distribution functions. Journal of Petrology, 45, 1983–2009.CrossRefGoogle Scholar
Gitlin, E.C., Salpas, P.A., McCallum, I.S. and Haskin, L.A. (1985) Small scale compositional heterogeneities in Stillwater anorthosite II. Lunar and Planetary Science XVI., Lunar and Planetary Institute, Houston USA. [Extended abstract p. 272].Google Scholar
Godel, B. and Barnes, S.-J. (2004) Image analysis and composition of platinum-group minerals in the J-M Reef, Stillwater Complex (U.S.A.). Economic Geology, 103, 637–651.CrossRefGoogle Scholar
Godel, B. and Barnes, S.-J. (2008) Platinum-group elements in sulphide minerals and the whole rocks of the J-M Reef (Stillwater Complex): Implication for the formation of the reef. Chemical Geology, 248,272—294.CrossRefGoogle Scholar
Godel, B., Barnes, S.-J. and Maier, W.D. (2006) 3-D distribution of sulphide minerals in the Merensky Reef (Bushveld Complex, South Africa) and the J-M Reef (Stillwater Complex, USA) and their relationship to microstructures using X-Ray computed tomography. Journal of Petrology, 47, 1853–1872.CrossRefGoogle Scholar
Godel, B. Maier, W.D. and Barns, S.-J. (2008) Platinum-group elements in the Merensky and J-M reefs: A review of recent studies. Journal Geological Society of India, 72, 595–609.Google Scholar
Gualda, G.A.R.. andGhiorso, M.S. (2015) MELTS_Excel: A Microsoft Excel-based MELTS interface for research and teaching of magma properties and evolution. Geochemistry, Geophysics, Geosystems, 16, 315–324.CrossRefGoogle Scholar
Hamlyn, P.R. and Keays, R.R. (1986) Sulfur saturation and second-stage Melts: Application to the Bushveld platinum metal deposits. Economic Geology, 81, 1431–1445.CrossRefGoogle Scholar
Hamlyn, P.R., Keays, R.R., Cameron, W.E., Crawford, A.J. and Waldron, H.M. (1985) Precious metals in magnesian low-Ti lavas: Implications for metallogen-esis and sulfur saturation in primary magmas. Geochimica et Cosmochimica Acta, 49, 1797—1811.CrossRefGoogle Scholar
Hanley, J.J., Mungall, J.E., Pettke, T., Spooner, E.T.C.. and Bray, C.J. (2008) Fluid and halide melt inclusions of magmatic origin in the Ultramafic and Lower Banded series, Stillwater Complex, Montanaa, USA. Journal of Petrology, 49, 1133–1160.CrossRefGoogle Scholar
Harmer, R.E., Auret, J.M. and Eglington, B.M. (1995) Lead isotope variations within the Bushveld complex, Southern Africa: a reconnaissance study. Journal of African Earth Sciences, 21, 595–606.CrossRefGoogle Scholar
Harper, M.P. (2004) Platinum Group Element Mineralization in “Ballrooms” of the J-M Reef of the Stillwater Complex, Montanaa., Unpublished MS thesis, Brigham Young University, Provo USA.Google Scholar
Haskin, L.A. and Salpas P.A. (1985) Petrogenesis of Stillwater anorthosites of the middle banded zone: causes of geochemical trends. Lunar and Planetary Science XVI., Lunar and Planetary Institute, Houstonn, USA. [Extended abstrac p. 325.Google Scholar
Haskin, L.A. and Salpas, P.A. (1992) Genesis of compositional characteristics of Stillwater AN-I and AN-II thick anorthosite units. Geochimica et Cosmochimica Acta, 56, 1187—1212.Google Scholar
Helz, R.T. (1985) Compositions of fine-grained mafic rocks from sills and dikes associated with the Stillwater Complex. Pp. 97-117 in: Stillwater Complex, Montanaa: Geology and Guide, (G.K. Czamanske and M.L. Zientek, editors). Montanaa Bureau of Mines and Geology, Special Publication, 92. Billings, Montana USA.Google Scholar
Helz, R.T. (1995) The Stillwater Complex, Montanaa: A subvolcanic magma chamber. American Mineralogist, 80, 1343–1346.CrossRefGoogle Scholar
Hess, H.H. (1960) Stillwater igneous complex, Montanaa — a quantitative mineralogical study. Geological Society of America Memoir, 80. Geological Society of America, Boulder, Colorado, USA.CrossRefGoogle Scholar
Horan, M.F., Morgan, J.W., Walker, R.J. and Cooper, R.W. (2001) Re-Os isotopic constraints on magma mixing in the Peridotite zone of the Stillwater Complex, Montanaa, USA. Contributions to Mineralogy and Petrology, 141, 446–457.CrossRefGoogle Scholar
Irvine, T.N. (1975) Crystallization sequences in the Muskox intrusion and other layered intrusions II. Origin of chromitite layers and similar deposits of other magmatic ores: Geochimica et Cosmochimica Acta, 39, 991–1020.Google Scholar
Irvine, T.N. (1977) Origin of chromite layers in the Muskox intrusion and other stratiform intrusions: A new interpretation. Geology, 5, 273–277.2.0.CO;2>CrossRefGoogle Scholar
Irvine, T.N., Keith, D.W. and Todd, S.G. (1983) The J-M platinum-palladium reef of the Stillwater Complex, Montanaa: II. Origin by double-diffusive convective magma mixing and implications for the Bushveld Complex. Economic Geology, 78, 1287–1334.CrossRefGoogle Scholar
Jackson, E.D. (1961) Primary textures and mineral associations in the ultramafic zone of the Stillwater Complex, Montanaa. U.S. Geological Survey Professional Paper, 358. Reston, Virginia, USA, 106.pp.Google Scholar
Jackson, E.D. (1963) Stratigraphic and lateral variation of chromite composition in the Stillwater Complex. Mineralogical Society of America Special Paper, 106, 46–54.Google Scholar
Jones, W.R., Peoples, J.W. and Howland, A.L. (1960) Igneous and tectonic structures of the Stillwater Complex, Montanaa. U.S. Geological Survey Bulletin, 1071-H, 281–340.Google Scholar
Kahlweit, M., (1975) Ostwald ripening of precipitates. Advances in Colloidal Interface Science, 5, 1—35.Google Scholar
Kanitpanyacharoen, W and Boudreau, A.E. (2012). Sulfide-associated mineral assemblages in the Bushveld Complex, South Africa: platinum-group element enrichment by vapor refining by chloride-carbonate fluids. Mineralium Deposita, 48, 193–210.CrossRefGoogle Scholar
Keays, R.R., Lightfoot, P.C. and Hamlyn, P.R. (2102) Sulfide saturation history of the Stillwater Complex, Montanaa: chemostratigraphic variation in platinum group elements. Mineralium Deposita, 47, 151–173.CrossRefGoogle Scholar
Kelemen, P.B., Whitehead, J.A., Aharonov, E. and Jordahl, K.A. (1995) Experiments on flow focusing in soluble porous media, with applications to melt extraction from the mantle. Journal of Geophysical Research, 100(B1), 475–496.CrossRefGoogle Scholar
Kleinkopf, M.D., (1985) Regional gravity and magnetic anomalies of the Stillwater Complex area. Pp. 33-38 in: The Stillwater Complex, Montanaa: Geology and Guide, (G.K. Czamanske and M.L. Zientek, editors) Montanaa Bureau of Mines and Geology Special Publication, 92. Billings, Montana USA.Google Scholar
Kushiro, I. (1975) On the nature of silicate melt and its significance in magma genesis: regularities in the shift of the liquidus boundaries involving olivine, pyroxene, and silica minerals. American Journal of Science, 275, 411–431.CrossRefGoogle Scholar
Kushiro, I., Yoder, H.S. and Nishikawa, M. (1968) Effect of water on the melting of enstatite. Geological Society of America Bulletin, 79, 1685–1692.CrossRefGoogle Scholar
Labotka, T.C. (1985) Petrogenesis of metamorphic rocks beneath the Stillwater Complex: Assemblages and conditions of metamorphism. Pp. 70—76 in: Stillwater Complex, Montanaa: Geology and Guide, (G.K. Czamanske and M.L. Zientek, editors). Montanaa Bureau of Mines and Geology, Special Publication, 92. Billings, Montana USA.Google Scholar
Labotka, T.C. and Kath, R.L. (2001) Petrogenesis of the contact-metamorphic rocks beneath the Stillwater Complex, Montanaa. Geological Society of America Bulletin, 113, 1312–1323.2.0.CO;2>CrossRefGoogle Scholar
Lambert, D.D. and Simmons, E.C. (1987) Magma evolution in the Stillwater Complex, Montanaa: I. Rare earth element evidence for the formation of the Ultramafic series. American Journal of Science, 287, 1—32.CrossRefGoogle Scholar
Lambert, D.D. and Simmons, E.C. (1988) Magma evolution in the Stillwater Complex, Montanaa: II. Rare earth element evidence for the formation of the J-M Reef. Economic Geology, 83, 1109–1126.CrossRefGoogle Scholar
Lambert, D.D., Walker, R.J., Morgan, J.W., Shirey, S.B., Carlson, R.W., Zientek, M.L., Lipin, B.R., Koski, M.S. and Cooper, R.L. (1994) Re-Os and Sm-Nd isotope geochemistry of the Stillwater Complex, Montanaa: Implications for the petrogenesis of the J-M Reef. Journal of Petrology, 35, 1717–1753.CrossRefGoogle Scholar
Lambert, D.D., Morgan, J.W., Walker, R.J., Shirey, S.B., Carlson, R.W., Zientek, M.L. and Koski, M.S. (1989) Re-Os and Sm-Nd isotope systematics of the Stillwater Complex, Montanaa. Science, 244, 1169—1174.CrossRefGoogle Scholar
Latypov, R (2015) Basal reversals in sills and layered intrusions. Pp. 259-294 in: Layered Intrusions,(B. Charlier, O. Namur, R. Latypov and C. Tegner, editors). Springer Berlin.Google Scholar
Lechler, P.I, Arehart, G.B. and Knight, M. (2002) Multielement and isotopic geochemistry of the J-M Reef, Stillwater intrusion. Pp. 245—248 in: Montanaa: 9th International Platinum Symposium, Abstract with Program, 21-25 July 2002., Billings, Montana USA.Google Scholar
Lenaz, D., Garuti, G., Zaccarini, F., Cooper, R.W. and Princivalle, F. (2012) The Stillwater Complex chro-mitites: The response of chromite crystal chemistry to magma injection. Geologica Acta, 10, 33—41.Google Scholar
LeRoy, L.W. (1985) Troctolite-Anorthosite zone I and the J-M Reef: Frog Pond adit to the Graham Creek area. Pp. 325-333 in: Stillwater Complex, Montanaa: Geology and Guide (G.K. Czamanske and M. L. Zientek, editors.). Montanaa Bureau of Mines and Geology, Special Publication, 92. Billings, Montanaa, USA.Google Scholar
Li, C. and Ripley, E.M. (2006) Formation of Pt-Fe alloy by desulphurization of Pt-Pd sulphide in the J-M Reef of the Stillwater Complex, Montanaa. The Canadian Mineralogist, 44, 895–903.CrossRefGoogle Scholar
Li, C. and Ripley, E.M. (2009) Sulfur contents at sulfide-liquid or anhydrite saturation in silicate melts: empirical equations and example applications. Economic Geology, 104, 405–412.CrossRefGoogle Scholar
Lipin, B.R. (1993) Pressure increases, the formation of chromite seams, and the development of the Ultramafic series in the Stillwater Complex, Montanaa. Journal of Petrology, 34, 955–976.CrossRefGoogle Scholar
Lipin, B.R. and Zientek, M.L. (2002) The Stillwater Complex, Montanaa: The root of a flood basalt province? Pp. 265—268 in: 9th International Platinum Symposium, Abstract with Program, 21—25.July 2002., Billings, Montana USA.Google Scholar
Lipman, P.W., Banks, N.G. and Rhodes, M.J. (1985) Degassing-induced crystallization of basaltic magma and effects on lava rheology. Nature, 317, 604–607.CrossRefGoogle Scholar
Loferski, P.J. and Arculus, R.J. (1993) Multiphase inclusions in plagioclase from anorthosites in the Stillwater Complex, Montanaa: implications for the origin of the anorthosites. Contributions to Mineralogy and Petrology, 114, 63—78.CrossRefGoogle Scholar
Loferski, P.I, Lipin, B.R. and Cooper, R.W. (1990) Petrology of chromite-bearing rocks from the lowermost cyclic units in the Stillwater Complex, Montanaa. U.S. Geological Survey Bulletin, 1674E, E1–E28.Google Scholar
Loferski, P.J., Arculus, R.J. and Czamanske, G.K. (1994) Rare earth element evidence for the Petrogenesis of the Banded Series of the Stillwater Complex, Montanaa, and its anorthosites. Journal of Petrology, 35, 1623–1649.CrossRefGoogle Scholar
Maier, W.D. and Barnes, S.-J. (1999) Platinum-group elements in silicate rocks of the Lower, Critical, and Main zones at Union Section, western Bushveld complex. Journal of Petrology, 40, 1647–1671.CrossRefGoogle Scholar
Manning, C.E. and Aranovich, L.Y. (2014) Brines at high pressure and temperature: Thermodynamic, petrologic and geochemical effects. Precambrian Research, 253, 6–16.CrossRefGoogle Scholar
Marsh, B.D. (2004) A magmatic mush column Rosetta Stone: the McMurdo Dry Valleys of Antarctica. EOS Transactions, American Geophysical Union, 85, 497–502.CrossRefGoogle Scholar
Mathez, E.A. and Waight, T.E. (2003) Lead isotopic disequilibrium between sulfide and plagioclase in the Bushveld Complex and the chemical evolution of large layered intrusions. Geochimica et Cosmochimica Acta, 67, 1875–1888.CrossRefGoogle Scholar
McBirney, A.R. (1987) Constitutional zone refining of layered mafic intrusions. Pp. 437—452 in: Origins of Igneous Layering (I., Parsons, editor). NATO ASI Series, Series C: Mathematical and Physical Sciences, vol. 186. Kluwer Academic, Dordrecht The Netherlands.Google Scholar
McBirney, A.R. (2008) Factors governing the textural development of Skaergaard gabbros: A review. Lithos, 111, 1–5.CrossRefGoogle Scholar
McBirney, A.R. and Creaser, R.A. (2003) The Skaergaard layered series, part VII: Sr and Nd Isotopes. Journal of Petrology, 44, 757–771.CrossRefGoogle Scholar
McBirney, A.R. and Noyes, R.M. (1979) Crystallization and layering of the Skaergaard Intrusion. Journal of Petrology, 20, 487–564.CrossRefGoogle Scholar
McCallum, I.S. (1996) The Stillwater Complex. Pp. 441—483 in: Layered Intrusions (R.G. Cawthorn, editor). Elsevier Science, Amsterdam.Google Scholar
McCallum, I.S., Raedeke, L.D. and Mathez, E.A., (1977) Stratigraphy and petrology of the Banded zone of the Stillwater Complex, Montanaa. EOS, 58, 1245.Google Scholar
McCallum, I.S., Raedeke, L.D. and Mathez, E.A. (1980) Investigations in the Stillwater Complex: Part I. Stratigraphy and structure of the Banded zone. Pp. 59-87 in: The Jackson Volume. Vol. 280-A, American Journal of Science (A. Irving and M. Dungan, editors). Kline Geology Laboratory, Yale University, New Haven, Connecticut.Google Scholar
McCallum, I.S., Thurber, D.W., O'Brien, H.E. and Nelson, B.K. (1999) Lead isotopes in sulfides from the Stillwater Complex, Montanaa: Evidence for subsolidus remobilization. Contributions to Mineralogy and Petrology, 137, 206–219.CrossRefGoogle Scholar
Meurer, W.P. and Boudreau, A.E. (1996a) The petrology and mineral compositions of the Middle Banded series of the Stillwater Complex, Montanaa. Journal of Petrology, 37, 583–607.CrossRefGoogle Scholar
Meurer, W.P. and Boudreau, A.E. (1996b) Evaluation of models for halogen variations in apatite from layered intrusions using a detailed study of apatite from OB-III and OB-IV of the Middle Banded series, Stillwater Complex, Montanaa. Contributions to Mineralogy and Petrology, 123, 225–236.CrossRefGoogle Scholar
Meurer, W.P. and Boudreau, A.E. (1996c) Compaction of density-stratified cumulates: effect on trapped-liquid distribution. Journal of Geology, 104, 115—120.CrossRefGoogle Scholar
Meurer, W.P. and Boudreau, A.E. (1998a) Compaction of igneous cumulates. Part I — Geochemical consequences for cumulates and liquid fractionation trends. Journal of Geology, 106, 281–292.CrossRefGoogle Scholar
Meurer, W.P. and Boudreau, A.E. (1998b) Compaction of igneous cumulates. Part II — Compaction and the development of igneous foliation. Journal of Geology, 106, 293–304.CrossRefGoogle Scholar
Meurer, W.P., Klaber, S.A. and Boudreau, A.E. (1997) Discordant bodies from Olivine-Bearing zones III and IV of the Stillwater Complex, Montanaa - Evidence for post-cumulus fluid migration in layered intrusions. Contributions to Mineralogy and Petrology, 130, 81—92.CrossRefGoogle Scholar
Meurer, W.P., Willmore, C.C. and Boudreau, A.E. (1998) Metal redistribution during fluid exsolution and migration in the Middle Banded series of the Stillwater Complex, Montanaa. Lithos, 47, 143–156.CrossRefGoogle Scholar
Mogk, D.W. and Mueller, P.A. (1990) Evidence for Archean accretionary tectonics in the northern Wyoming Province, SW Montanaa. Geological Society of America Abstracts with Programs, 22, 262.Google Scholar
Newton, R.C. and Manning, C.E. (2000) Quartz solubility in H2O-NaCl and H2O-CO2 solutions at deep crust-upper mantle pressures and temperatures: 2—15 kbar and 500—900 °C. Geochimica et Cosmochimica Acta, 64, 2993–3005.CrossRefGoogle Scholar
Nicholson, D.M. and Mathez, E.A. (1991) Petrogenesis of the Merensky Reef in the Rustenburg section of the Bushveld Complex. Contributions to Mineralogy and Petrology, 107, 293–309.CrossRefGoogle Scholar
Nunes, P.D. (1981) The age of the Stillwater Complex: a comparison of U-Pb zircon and Sm-Nd isochron systematics. Geochimica et Cosmochimica Acta, 45, 1961–1963.CrossRefGoogle Scholar
Nunes, P.D. and Tilton, G.R. (1971) Uranium-lead ages of minerals from the Stillwater Complex and associated rocks, Montanaa. Geological Society of America Bulletin, 82, 2231–2250.CrossRefGoogle Scholar
Page, N.J. (1971) Sulfide minerals in the G and H chromitite zones of the Stillwater Complex, Montanaa. U.S. Geological Survey Professional Paper, 694. Reston, Virginia, USA.Google Scholar
Page, N.J. (1977) Stillwater Complex, Montanaa: rock succession, metamorphism and structure of the Complex and adjacent rocks. U.S. Geological Survey Professional Paper, 999. Reston, Virginia, USA.Google Scholar
Page, N.J. (1979) Stillwater Complex, Montanaa -Structure, mineralogy and petrology of the basal zone with emphasis on the occurrence of sulfides. U.S. Geological Survey Professional Paper, 1038. Reston, Virginia, USA.Google Scholar
Page, N.J. and Moring, B.C. (1990) Petrology of the noritic and gabbronoritic rocks below the J-M reef in the Mountain View area, Stillwater Complex, Montanaa., U.S. Geological Survey Bulletin 1674-C. Reston, Virgini USA.Google Scholar
Page, N.J. and Zientek, M.L. (1987) Composition of primary postcumulus amphibole and phlogopite within an olivine cumulate in the Stillwater Complex, Montanaa., U.S. Geological Survey Bulletin, 1674-A. Reston, Virgini USA.Google Scholar
Page, N.J., Zientek, M.L., Czamanske, G.K. and Foose, M.P. (1985) Sulfide mineralization in the Stillwater Complex and underlying rocks. Pp. 93-96 in: Stillwater Complex, Montanaa: Geology and Guide, (G.K. Czamanske and M.L. Zientek, editors), Montanaa Bureau of Mines and Geology Special Publication, 92. Billings, Montana USA.Google Scholar
Pagé, P., Barnes, S.J. and Zientek, M.L. (2011) Formation and evolution of the chromitites of the Stillwater Complex: a trace element study. Pp. 678-680 in: Let's Talk Ore Deposits: Proceedings of the 11th SGA Biennial Meeting, Antofagasta, Chile, (Barra, F., editors). Society for Geology Applied to Mineral Deposits.Google Scholar
Papike, J.J., Spilde, M.N., Fowler, G.W. and McCallum, I.S. (1995) SIMS studies of planetary cumulates: Orthopyroxene from the Stillwater Complex, Montanaa. American Mineralogist, 80, 1208—1221.CrossRefGoogle Scholar
Pass, K.D. and Salpas, P.A. (1990) Toward an under-standing of the bulk composition of thick Stillwater anorthosite unit An II. Lunar and Planetary Science XXI., Lunar and Planetary Institute, Houstonn, USA. [Extended abstract p. 938].Google Scholar
Pass, K.D. and Salpas, P.A. (1991) Progress toward understanding the petrogenesis of anorthosite in the Stillwater Complex, Montanaa: The bulk composition of AN II. Journal of the Alabama Academy of Science, 62, 938.Google Scholar
Peoples, J.W. and Howland, A.L. (1941) Chromite deposits of the eastern part of the Stillwater complex, Stillwater County, Montanaa. U.S. Geological Survey Bulletin, 922-N, 371–16.Google Scholar
Premo, W.R., Helz, R.T., Zientek, M.L. and Langston, R.B. (1990) U-Pb and Sm-Nd ages for the Stillwater Complex and its associated sills and dikes, Beartooth Mountains, Montanaa: Identification of a parent magma. Geology, 18, 1065–1068.2.3.CO;2>CrossRefGoogle Scholar
Prevec, S.A., Ashwal, L.D. and Mkaza, M.S. (2005) Mineral disequilibrium from the Merensky pegmatoid, western Bushveld Complex, South Africa: new Sm-Nd isotopic evidence. Contributions to Mineralogy and Petrology, 149, 306–315.CrossRefGoogle Scholar
Raedeke, L.D. (1982) Petrogenesis of the Stillwater Complex., Unpublished PhD dissertation, University of Washington, Seattle USA.Google Scholar
Raedeke, L.D. and McCallum, I.S. (1980) A comparison of fractionation trends in the lunar crust and the Stillwater Complex. Pp. 133-153 in. Proceedings of the conference on the lunar highlands crust (R.B. Merrill and J. J. Papike, editors). Geochimica et Cosmochimica Acta, sup. 12, 133–153.Google Scholar
Raedeke, L.D. and McCallum, I.S. (1984) Investigations in the Stillwater Complex: Part II. Petrology and petrogenesis of the ultramafic series. Journal of Petrology, 25, 395–420.CrossRefGoogle Scholar
Raedeke, L.D. and Vian, R.W. (1986) A three dimensional view of mineralization in the Stillwater J-M Reef. Economic Geology, 81, 1187–1195.CrossRefGoogle Scholar
Ryder, G. and Spettel, B (1985) The Parental Magma for Some Rocks from the Norite 1 Subzone of the Stillwater Complex: A Lunar Analog Study. Proceedings of the 15th Lunar and Planetary Science Conference, Part 2, Journal of Geophysical Research, 89(Supplement), C545-C559.CrossRefGoogle Scholar
Salpas, P.A. and Moss, B. (1989) A preliminary compositional study of anorthosite and related rocks from the Lower Banded series of the Stillwater Complex. Lunar and Planetary Science XX., Lunar and Planetary Institute, Houstonn, USA. [Extended abstract p. 972].Google Scholar
Salpas, P.A. and Pass, K.D. (1990) Geochemistry of the base of the main anorthosite bearing series, Stillwater Complex. Lunar and Planetary Science XXI., Lunar and Planetary Science Institute, Houstonn, USA. [Extended abstract Pp. 1065-1066].Google Scholar
Salpas, P.A., Haskin, L.A. and McCallum, I.S. (1983) Stillwater anorthosites: A lunar analog. Proceedings of the 14th Lunar and Planetary Science Conference, Journal of Geophysical Research, 88(Supplement), B27–B39.CrossRefGoogle Scholar
Salpas, P.A., Haskin, L.A. and McCallum, I.S. (1984) The scale of compositional heterogeneities in Stillwater anorthosites AN I and AN II. Lunar and Planetary Sciences XV., Lunar and Planetary Institute, Houstonn, USA. [Extended abstract p. 713].Google Scholar
Salpas, P.A., Haskin, L.A. and McCallum, I.S. (1987) Trace element distributions among subunits of a Stillwater anorthosite boulder. Lunar and Planetary Science XVIII, Lunar and Planetary Institute, Houstonn, USA. [Extended abstract, p. 872].Google Scholar
Scheidle, D.L. (1983) Plagioclase zoning and compositional variation in Anorthosites I and II along the Contact Mountain Traverse, Stillwater Complex, Montanaa., Unpublished MS thesis, Stanford University, Stanform USA.Google Scholar
Segerstrom, K. and Carlson, R.R. (1982) Geologic map of the banded upper zone of the Stillwater Complex and adjacent rocks, Stillwater, Sweet Grass, and Park Counties, Montanaa. , U.S. Geological Survey Miscellaneous Investigations series Map 1-1383, 2 sheets, scale 1 : 2000.Google Scholar
Selkin, P.A., J.S. Gee, J.S., Tauxe, L., Meurer, W.P. and Newell, A.J. (2000) The effect of remanence anisot-ropy on paleointensity estimates: a case study from the Archean Stillwater Complex. Earth and Planetary Science Letters, 183, 403–41.CrossRefGoogle Scholar
Selkin, P.A., Gee, J.S., Meurer, W.P. and Hemming, S.R. (2008) Paleointensity record from the 2.7 Ga Stillwater Complex, Montanaa. Geochemistry, Geophysics, Geosystems, 9, DOI: 10.1029/2008GC001950Google Scholar
Shirley, D.N. (1986) Compaction of igneous cumulates. Journal of Geology, 94, 795–809.CrossRefGoogle Scholar
Spandler, C., Mavrogenes, I and Arculus, R. (2005) Origin of chromitites in layered intrusions: Evidence from chromite-hosted melt inclusions from the Stillwater Complex. Geology, 33, 893–896.CrossRefGoogle Scholar
Sun, S.-S., Nesbitt, R.W. and McCulloch, M.T. (1989). Geochemistry and petrogenesis of Archean and early Proterozoic siliceous high-magnesian basalts. Pp. 149—173 in: Boninites, (A.J Crawford, editor), Unwin Hyma London.Google Scholar
Talkington, R.W. and Lipin, B.R. (1986) Platinum-group minerals in chromite seams of the Stillwater Complex, Montanaa. Economic Geology, 81, 1179—1186.CrossRefGoogle Scholar
Thurber, M.W. and McCallum, I.S. (1990) The ultramafic series-Banded series contact in the Stillwater Complex: Evidence for thermal erosion. Lunar and Planetary Science XXI., Lunar and Planetary Institute, Houstonn, USA. [Extended abstract pp. 1254-1255].Google Scholar
Todd, S.G., Keith, D.W., LeRoy, L.W., Shissel, D.J., Mann, E.L. and Irvine, T.N. (1982) The J-M platinum-palladium reef of the Stillwater Complex, Montanaa: I. Stratigraphy and petrology. Economic Geology, 77, 1454–1480.Google Scholar
Turner, A.R., Wolfgram, D. and Barnes, S.J. (1985) Geology of the Stillwater county sector of the J-M Reef, including the Minneapolis adit. Pp. 210—231 in: Stillwater Complex, Montanaa: Geology and Guide, (G. K. Czamanske and M.L. Zientek, editors). Montanaa Bureau of Mines and Geology, Special Publication 92. Billings, Montana USA.Google Scholar
Vaniman, D.T., Papike, J.J. and Labotka, T. (1980) Contact-metamorphic effects of the Stillwater Complex, Montanaa: the concordant iron formation. American Mineralogist, 65, 1087–1102.Google Scholar
Wall, C.J., Scoates, J.S., Friedman, R.M. and Meurer, W.P. (2009) Revisiting the age of the Stillwater Complex. American Geophysical Union, Fall Meeting 2009, Abstract V21A-1959.Google Scholar
Wall, C.J., Scoates, J.S., Friedman, R.M. and Meurer, W.P. (2010) Refining the precise age and duration of magmatism related to the Stillwater Complex. 11th , International Platinum Symposium, Sudbury Ontario, June 20-2 2010. [Extended abstract].Google Scholar
Wall, C.J., Scoates, J.S., Friedman, R.M. and Meurer, W.P. (2012) Age of the Stillwater Complex. Mineralogical Magazine, 76, 2506 [Goldschmidt Montreal Abstract #20565].Google Scholar
Waters, C. and Boudreau, A.E. (1996) A reevaluation of crystal size distributions in chromite cumulates. American Mineralogist, 81, 1452–1459.CrossRefGoogle Scholar
Willmore, C.C., Boudreau, A.E. and Kruger, F.J. (2000) The halogen geochemistry of the Bushveld Complex, Republic of South Africa: Implications for chalcophide element distribution in the Lower and Critical Zones. Journal of Petrology, 41, 1517–1539.CrossRefGoogle Scholar
Wooden, J.L., Czamanske, G.K. and Zientek, M.L. (1991) A lead isotopic study of the Stillwater Complex, Montanaa: constraints on crustal contamination and source regions. Contributions to Mineralogy and Petrology, 107, 80–93.CrossRefGoogle Scholar
Zientek, M.L. (1983) Petrogenesis of the Basal zone of the Stillwater Complex, Montanaa., Unpublished PhD dissertation, Stanford University, Stanford USA.Google Scholar
Zientek, M.L., Czamanske, G.K. and Irvine, T.N. (1985) Stratigraphy and nomenclature for the Stillwater Complex. Pp. 21-32 in: Stillwater Complex, Montanaa: Geology and Guide, (G.K. Czamanske and M.L. Zientek, editors). Montanaa Bureau of Mines and Geology, Special Publication 92. Billings, Montana USA.Google Scholar
Zientek, M.L., Fries, T.L. and Vian, R.W. (1990) As, Bi, Hg, S, Sb, Sn, and Te geochemistry of the J-M Reef, Stillwater Complex, Montanaa: constraints on the origin of PGE-enriched sulfides in layered intrusions. Journal of Geochemical Exploration, 37, 51–73.CrossRefGoogle Scholar
Zientek, M.L., Cooper, R.W., Corson, S.R. and Geraghty, E.P. (2002) Platinum-group element mineralization in the Stillwater Complex, Montanaa. Pp. 459-481 in: Geology, Geochemistry, Mineralogy and Mineral Benefication of Platinum-Group Elements, (L.J Cabri, editor). Special Volume 54. Canadian Institute of Minin Metallurgy and Petroleum.Google Scholar
Zientek, M.L., Foose, M.P. and Mei, L. (2008) Palladium, platinum, and rhodium contents of rocks near the lower margin of the Stillwater Complex, Montanaa. Economic Geology, 81, 1169–1178.CrossRefGoogle Scholar
Zientek, M.L. and Ripley, E.M. (1990) Sulfur isotopic studies of the Stillwater Complex and associated rocks, Montanaa. Economic Geology, 85, 376–391.CrossRefGoogle Scholar