 | | Journal (article/letter/editorial) | | crystallization of the surrounding rock of the Stillwater Complex, Montana Samantha R. Baker1,2 · Alan E. Boudreau3...Abstract The Banded Series of the Archean-aged Stillwater Complex contains three thick anorthosites overlain...different liquid line of descent than the rest of the complex. Alternatively, it has been suggested that the...of the underlying anorthosites. Keywords Stillwater Complex · Layered intrusions · Troctolite · Igneous...Upper School, 3601 Ridge Rd., Durham, NC 27705, USA The reappearance of minerals such as olivine and |  | | Journal (article/letter/editorial) | | 1980 Contact-metamorphiceffects of the Stillwater Complex, Montana: the concordant iron fomation D. T. VelltMAN...contact-concordant at the base of the Stillwater Igneous Complex, Montanao was contact-metamorphosedto...two-stageexsolution textures suggestinginversion from Fe-pigeonite; the thermal stability of identical pyroxene compositions...igneous body. Exchange along fractures in the Stillwater Iron Formation included limited introduction...introduction of Cu, S, and Al, probably from the Stillwater Complex. absent).Our major purposeis to evaluatethe |  | | 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) | | terrestrial orthopyroxenites and norites (Stillwater Complex, Montana). We emphasizedthe REE (La, Ce, Nd, Sm...orthopyroxenite sequence(Bronzitite zone of the Stillwater Complex). An important lessonto be learned from thesestudiesin...of cumulus orthopyroxene grains from the Stillwater Complex (Papike et al. 1995) we noted that thin rims...investigations becausewhen pigeonite inverts to orthopyroxeneby slow cooling, a very complex exsolution texture...elementsbetweenaugiteand orthopyroxeneor augite and pigeonite from inverted pigeonite in several cumulate eucrites.Table |  | | Report (issue) | | Stillwater Complex, Montana Structure, Mineralogy, and Petrology of the Basal Zone with emphasis on the...Cataloging in Publication Data Page, Norman J Stillwater Complex, Montana Structure, Mineralogy, and Petrology...Igneous. 2. Intrusions (Geology) Montana. 3. Sulphides. 4. Ore-deposits Montana. I. Title. II. Series: United................... Geologic history of the Stillwater Complex and adjacent rocks Previous work and acknowledgments...FIGURH 1. 2. 3. 4. 5. 6. 7. Index map of the Stillwater Complex ........................................ |  | | Journal (article/letter/editorial) | | 280-A, 1980, P. 59-87] INVESTIGATIONS OF THE STILLWATER COMPLEX: PART I. STRATIGRAPHY AND STRUCTURE OF THE...�ACT: The plagioc::Jasc-rich rocks of the Stillwater Complex have been subdivided mto three rnaior zones...percent (by volume) of this zone. Two exceptionally complex olivine bearing suhzones are sandwiched between...zone of the Stillwater Complex will remain the standard of com parison. The Stillwater Complex has continually...large reserves of chrome ore combine to make the complex a significant repository of magmatic ore deposits |  | Snyder, Gregory A., Taylor, Lawrence A., Jerde, Eric A., Sharkov, E. V., Liachovitch, V. V., Ledneva, G. V. (1995) Petrology and Chemistry of an Early Proterozoic Lherzolite-Gabbronorite-Anorthosite Pluton of the White Sea Complex, Northern Karelia, Russia. International Geology Review, 37 (6) 547-560 doi:10.1080/00206819509465417 | Journal (article/letter/editorial) | | Lherzolite-GabbronoriteAnorthosite Pluton of the White Sea Complex, Northern Karelia, Russia a a a Gregory A. Snyder...LherzoliteGabbronorite-Anorthosite Pluton of the White Sea Complex, Northern Karelia, Russia, International Geology...LherzoliteGabbronorite-Anorthosite Pluton of the White Sea Complex, Northern Karelia, Russia G R E G O R Y A. S N...igneous bodies in the early Preeambrian White Sea complex— the Severnyy and Yuzhnyy massifs on Pezhostrov...similar age worldwide, including the Stillwater intrusion, Montana, USA. Thus, this character of magmatism |  | | Journal (article/letter/editorial) | | plagioclase from anorthosites in the Stillwater Complex, Montana: implications for the origin of the anorthosites...1US Geological Survey, M.S. 954, Reston, VA 22092, USA 2Department of Geology and Geophysics, University...plagioclase grains from anorthosites in the Stillwater Complex, Montana, and in other rocks from the Middle Banded...anorthosites compared to other rocks in the Stillwater Complex. A lack of correlation between P contents...One of the enigmatic aspects of the Stillwater Complex, Montana is the origin of two massive sheets of |  | | Journal (article/letter/editorial) | | the growth of exsolution lamellae in augite and pigeonite, we deducedcooling rates and from theseestimated...measuredacrosshost-(001) lamellar pairs in augite and pigeonite from a variety of lunar highland samples.Most...LUNAR CRUSTAL STRATIGRAPHY 1.2 Augite 1'0 s pigeonite \I = {ot o-o Deconvolved ._. convotve. 0.6...coefficients of Ca (D*) parallel to c in augite and pigeonite were determined by Fujino et al. (1990, and 1993...of the modeling of compositional profiles of pigeonite and augite from two ferroan anorthosite samples(60025 |  | | Report (issue) | | Geological Society of America Memoir 80 STILLWATER IGNEOUS COMPLEX, MONTANA A QUANTITATIVE MINERALOGICAL STUDY...Edward Sampson began the study of the Stillwater complex, Montana, in 1930. The writer commenced a detailed...detailed study of the mineralogy of the complex in 1935 after several periods in the field in preceding...Peoples would write the general geology of the complex, Howland the floor rocks and sulfide deposits,...have published a number of short papers on the complex. (Peoples, 1933; 1936; Howland, Peoples, and Sampson |  | | Journal (article/letter/editorial) | | Zircon from the Anorthosite zone II of the Stillwater Complex as a U–Pb geochronological reference material...Zircon from the Anorthosite zone II of the Stillwater Complex as a U–Pb geochronological reference material...Zircon from the Anorthosite zone II of the Stillwater Complex as a U-Pb SC RI geochronological reference...Anorthosite zone II (AN2) of the Neoarchean Stillwater Complex (Montana, USA) is a TE D candidate for an Archean...ratios determined by LA-ICP-MS are variable in Stillwater AN2 zircon (e.g., U = 54-585 ppm, Hf = 5500-9800 |  | | Journal (article/letter/editorial) | | clinobronzite parallel to (100). Pigeon& crystals are very complex c~stallo~&p~c~ly and chemic&lly, with optic&ly... XF-= values for five host-lsmellae pairs in pigeonite K-4 indicate a significtlnt amount of subso~dua...unzoned or only slightly zoned, pyroxenes exhibiting complex exsolution and inversion phenomena, indicrttive...by X-ray diffraction, one (K-4) is primarily pigeonite, the rest being orthopyroxenes. RESULTS BND DIscussroN...dimensions and estimated compositions of Luna 20 pigeonite (spaoe group PZJc), orthopyroxene (space group |  | | Report (chapter) | | Laramie, Bighorn and Beartooth ranges of Wyoming, USA. Close geochemical similarities between typical coarse-grained...basic igneous intrusions, such as Bushveld and Stillwater, were derived by the mixing of two different...layered basic intrusions (e.g. the Bushveld and Stillwater Complexes) were derived (Irvine et al. 1983;...Laramie, Bighorn and Beartooth mountains of Wyoming, USA (Snyder 1984; Snyder et al. 1985; Hall & Hughes unpublished...olivine and elongate zoned crystals of Mg-rich pigeonite mantled by augite occur within a very fine-grained |  | McCallum, I. Stewart, Domeneghetti, M. Chiara, Schwartz, Jeffrey M., Mullen, Emily K., Zema, Michele, Cámara, Fernando, McCammon, Catherine, Ganguly, Jibamitra (2006) Cooling history of lunar Mg-suite gabbronorite 76255, troctolite 76535 and Stillwater pyroxenite SC-936: The record in exsolution and ordering in pyroxenes. Geochimica et Cosmochimica Acta, 70 (24) 6068-6078 doi:10.1016/j.gca.2006.08.009 | Journal (article/letter/editorial) | | Mg-suite gabbronorite 76255, troctolite 76535 and Stillwater pyroxenite SC-936: The record in exsolution and...Sciences, University of Washington, Seattle, WA 98195, USA b Dipartimento di Scienze della Terra, Università...Geosciences, University of Arizona, Tucson, AZ 85721, USA Received 9 February 2006; accepted in revised form...terrestrial sample (orthopyroxenite SC-936 from the Stillwater Complex), on the basis of their Fe–Mg ordering states...for the lunar samples and 106 C/year for the Stillwater sample. A cooling rate for 76255, determined |  | 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...and ultramafic cumulates from the 2700-Ma Stillwater Complex and associated fine-grained sills and dykes |  | | Journal (article/letter/editorial) | | Universityof New Mexico, Albuquerque, NM 87 13l- 1126, USA (Received February 16, 1994; accepted in revised&m...eucrites, and diogenites or “HED.” Eucrites are pigeonite/plagiocla~ basalts, and diogenites are orthopyroxenites...the various cumulate horizons in the Stillwater Complex, Montana, USA. These authors demonstrated that the...( 1993) noted REE depletion near the rims of Stillwater orthopyroxene grains but suggested that this...pyroxene phase is pigeonite. In slowly cooled cumulate assemblages, monoclinic pigeonite inverts to orthopyroxene |  | Rifai, Kheireddine, Michaud Paradis, Marie-Chloé, Swierczek, Zofia, Doucet, François, Özcan, Lütfü, Fayad, Alejandro, Li, Jing, Vidal, François (2020) Emergences of New Technology for Ultrafast Automated Mineral Phase Identification and Quantitative Analysis Using the CORIOSITY Laser-Induced Breakdown Spectroscopy (LIBS) System. Minerals, 10 (10) 918 doi:10.3390/min10100918 | Journal (article/letter/editorial) | | were used in this study were collected at the Stillwater platinum group element mine in the United States...in the present study come from the Stillwater Complex, Montana (USA). The USGS organization recently published...Mountain areas geological survey data from the same complex. The SEM-EDS technology used for all samples was...out on drill core fragments from the PGE Stillwater mine in USA [23]. The main objective of that study...PGE-bearing ultramafic core samples Origin Stillwater complex, USA Mineral content Major minerals: bytownite |  | | Journal (article/letter/editorial) | | into pigeonite, but that pigeonite is a definite and distinct mineral variety. Augite and pigeonite may...exists in a portion of the clinopyroxene field. Pigeonite inverts on slow cooling to hypersthene and this...geological thermometer. Hypersthene inverted from pigeonite can be distinguished from hypersthene of primary...Dikes. . D. Diabasic Border Facies of the Stillwater Complex E. Summary of Pyroxene Relations in Diabases...Noriles ond, Gabbros A.StillwaterComplex,Montana.... B. Bushveld Complex. Transvaal C. Skaergaard Intrusion |  | | Journal (article/letter/editorial) | | Sciences, University of Washington, Seattle, Wash. (USA) Original manuscript received August 30, 1974 Returned...olivine; 5 = 67075,18-14 pigeonite bulk analysis; 6 = 67075,18-14 pigeonite host; 7 = 67075,18-14 (001)...67075,18-4 augite host; 10 = 67075,18-4 (001)pigeonite lamella; 11 = 67075,18-4 spinel lamella. Healed...inverted pigeonite (at extinction) and many narrow (001) lamellae (1-2/~m) of uninverted pigeonite. Very...fine (100) pigeonite lameUae are visible in upper right corner. The bands in the broad pigeonite lamellae |  | | 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,...rocks, Stillwater-associated sills and dikes, sulfide accumulations near the base of the complex, and platinum-group...iron-formation, Stillwater-associated sills and dikes, and basal sulfide accumulations in the complex (mean -0...occur above the basal accumulations in the Stillwater Complex (mean 1.2 per mil). The isotopic composition |  | | Journal (article/letter/editorial) | | approximatelyMg.slFe.loCa.oaSizOo from the Stillwater Complex,Montana (Hess, 1960) which exhibits a lamellar...1960) took X-ray singlecrystalphotographs of the Stillwater bronzites and confirmed Henry's experimentalresults...Brown (1969) examineda bronzite from the Stillwater Complex in an electron resolution electron microscope...above and the secondwas an ion-thinnedspecimenof pigeonite from the Isle of Mull (Hallimond, 1914) which...I 9 r 4+ 0 . 1 8 Glass Standard 2735 Mull Pigeonite * Frc. 4. Electron micrograph of a large lamella |  | | Journal (article/letter/editorial) | | correspond to proposed parental liquids of the Bushveld Complex and other major layered basic igneous intrusions...of olivine, rare orthopyroxene and composite pigeonite - augite grains in a quenched, microcrystalline...microcrystalline matrix of various pyroxenes (pigeonite, subcalcic augite and augite), amphiboles after pyroxenes,...orthopyroxene, olivine and (most commonly) Mg-rich pigeonite mantled by augite, in a quenched, dendritic groundmass...only occurs as a groundmass phase. The composite pigeonite - augite primocrysts in this dyke are elongate |  | | Report (volume) | | Antarctica is a differentiated stratiform mafic igneous complex of unusually large areal dimension, probably at...poor in calcium, in the series bronzite-inverted pigeonite. Magnetite is a mjaor cumulus phase in many rocks...The resemblance also of rocks of the Stillwater Complex of Montana to sedimentary rocks was noted by Jones...intrusion are thus plagioclase-augiteinverted pigeonite-opaque oxide cumulates that may more simply be...Dufek and other layered complexes, such as the Stillwater and Bushveld, suggests that mafic cumulates on |  | | Journal (article/letter/editorial) | | Copyright © 1999 Elsevier Science Ltd Printed in the USA. All rights reserved 0016-7037/99 $20.00 1 .00 Pergamon...chamber: An example from the Freetown Layered Complex of Sierra Leone CHRISTOPHER I. CHALOKWU,*,1 EDWARD...29204, USA Department of Geological Sciences, Indiana University, Bloomington, Indiana 47405, USA 2 (Received...February 8, 1999) Abstract—The Freetown Layered Complex of Sierra Leone is a 7-km thick, rift-related tholeiitic...the opening of the middle Atlantic Ocean. The Complex was emplaced above Archean basement gneisses, granulites |  | | Journal (article/letter/editorial) | | olivine-bearing zones III and IV of the Stillwater Complex, Montana ± evidence for postcumulus ¯uid migration...and IV of the Middle Banded series of the Stillwater complex. The discordant bodies are elongate perpendicular...1992). This report focuses on bodies from the Stillwater complex that are mineralogically simple (composed...examples of these ``discordant bodies'' from the Stillwater complex include discordant dunites (Raedeke and McCallum...Grove The stratigraphic divisions of the Stillwater complex used in this report are summarized in Fig |
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