| | Journal (article/letter/editorial) | CompositionalVariation in Laurite and EnclosingChromite from the Bird River Sill, Manitoba DANIEL OHNENSTETTER...uppermainchromitite, section225-180E, of the Bird River sill providessignificantevidencethat platinum-group...GeologicSettingof the Bird River Sill Chromitites -)'oĂžw 9'0Ăžw N.W.T âą THE Bird River sill is an Archcan...1981),butprimarytextures arecommonly preserved. The sill is characterizedby a lower ultramaficseries and...ophiolites(Constantinides âąC. 1. Location of the Bird Biver sill, Manitoba, after Talket al., 1980; Aug6,1985, for | | | Journal (article/letter/editorial) | Platinum-Group-Mineral Inclusions in Chromite from the Bird River Sill, Manitoba* W. Talkington**, D. H. Watkinson, P....Geology, Carleton University, Ottawa, Ontario, Canada K1S 5B6 Platinum-group minerals (PGM) have been...identified as inclusions in chromite from the Bird River Sill, Manitoba. The inclusions are small (< 20 microns)...euhedral. The PGM inclusions are (Ru, Os, Ir) $2, laurite, and (Os, Ir, Ru alloy), rutheniridosmine: Laurites...neither platinum nor palladium has been detected. Laurite inclusions in chromite from the ultramafic zone | | | Journal (article/letter/editorial) | extensive than Ru ,âą Ir. Both Pd and Rh abundances in laurite are lessthan 2 wt percent. No Pt wasdetected.At...Page(1971), andPage et al. (1972) have identified laurite inclusionsin chromite and olivine from the B seam... Whole-rock chemicalanalysesof Pt, Pd, and Rh Laurite is commonlya solitarymineralin a grainof havebeenperformedby...(1980), and Simonet al. (1980). Alternatively, laurite and other types of inclusions, The detection limits...Iridium and but not in contact with each other. Laurite has also Ru havebeen analyzedby the methoddescribedby | | | Journal (article/letter/editorial) | Geoscience Studies, Carleton University, Ottawa, Canada Platinum-Group Minerals and Other Solid Inclusions...sulphide phases. In addition to these associations, laurite (RuS 2 ) and PGE alloys occur in the same specimen...Bushveld Complex, South Africa samples and the laurite-silicate association described by Stockman (ms...Composition Size (/~m) Crystal Habit Reference a) laurite b) silicates c) fluid inclusions d) sulphide (1)...Kokkinorotsos Chrome Mine dunite in harzburgite a) laurite b) erlichmanite c) silicate d) pyrite e) pyrrhotite | | | Journal (article/letter/editorial) | 108, pp. 895â907 AGE OF THE BIRD RIVER SILL, SOUTHEASTERN MANITOBA, CANADA, WITH IMPLICATIONS FOR THE...Vancouver, BC V6T-1Z4, Canada 2 2502 Holyrood Drive, Nanaimo, BC V9S-4K9, Canada Abstract The Archean...Archean Bird River sill, a 20-km-long and up to 800-m-thick mafic-ultramafic layered intrusion in the Bird River...River greenstone belt of southeastern Manitoba, Canada, contains significant resources of chromium and...ultramafic rocks at the base of, or just below, the sill (e.g., past-producing MaskwaDumbarton mines). In | | | Journal (article/letter/editorial) | ultramafic rocks of the Bird River Sill, SE Manitoba, Canada P. Theyer Manitoba Energy and Mines, 555-330...555-330 Graham Avenue, Winnipeg, Manitoba, Canada, R3C 4E3 Received: March 2, 1989/Revisedversion: September...the Archean Bird River Sill, a mafic-ultramafic stratiform intrusion in southeastern Manitoba, is divided...crystallization histories. The Bird River Sill in southeastern Manitoba is a differentiated and layered...shifted in the last decade onto the potential of the Sill as a repository of platinum group elements. Documentation | | | Journal (article/letter/editorial) | GeoscienceCentre, Carleton University, Ottawa KIS 5B6, Canada Ansrru,cr Hollingworthite from a deposit rich...Evstigneeva, 1986); Werner Lake, Canada (Rucklidge, 1969); Rathbun Lake, Canada (Rowell and Edgar, 1986);Kambalda...pentlandite interstitial to chromite in the Bird River Sill, Canada(Cabri and Laflamme, 1988); in chromite...SEM at the BRGM and at the Geological Survey of Canada,and the X-ray scanningwas performed on the Camebaxmicrobeam...easily than would Os and Ru in hollingworthite. Laurite (RuSr) and erlichmanite (OsSr) have the same Pa3 | | | Journal (article/letter/editorial) | Upper Central Layered Zone of the Fox River Sill, Northeastern Manitoba* R. F. J. SCOATESAND O. R. ECKSTRAND...ECKSTRAND GeologicalSurveyof Canada,601 BoothStreet,Ottawa, CanadaK1A OE8 Abstract Platinum-groupelement abundancesrangingup...certaincyclicunitsof the FoxRiver sill, northeasternManitoba.The sill is a 250-km-long,predominantlyultramaficstratiform...could result if its principal occurrence were as laurite inclusions in chromite. Althoughthe chondrite-normalized...Fox River sill shouldoccurin thin, highlydifferentiatedcyclicunits. Introduction THE Fox River sill | | | Journal (article/letter/editorial) | following order of abundance: (1) sulfides [Os-rich laurite, erlichmanite and unnamed (Ir,Rh)(Ni,Cu,Fe)2S3]...common abundance of PGE sulfides, i.e., Os-rich laurite, in the Oman chromitites is ascribed to the su...fugacity was sufficiently high to produce the Os-rich laurite and, to a lesser extent, erlichmanite and Ru-poor...an early stage of serpentinization. Keywords: laurite, chromitite, ophiolite, platinum-group elements...dans un ordre selon leur abondance: (1) sulfures [laurite osmifĂšre, erlichmanite et (Ir,Rh)(Ni,Cu,Fe)2S3 | | | Journal (article/letter/editorial) | trendis probablydueto upwardcrypticvariationin laurite,the mostlikelymineralhostfor these elementsin the...and Fesq, 1986) suggestedthat the chemistry of laurite [(Ru,Os,Ir)S2]was sensitive to magma composition...Rh-bearingphasesas interstitial minerals;subhedralto euhedral laurite grains occurasinclusionsin the chromitegrains(Talking-...chromititesare mitites in the ultramafic series of the Bird River sill. enriched in platinum-group elements compared...chromite(Ru + Os + Ir) al., 1986). Chromite from the Bird River sill con- and the other as sulfideplatinum-groupelements | | Prichard, Hazel M., Barnes, Sarah-Jane, Fisher, Peter C., PagĂ©, Philippi, Zientek, Michael L. (2017) Laurite and Associated PGM In the Stillwater Chromitites: Implications For Processes of Formation, and Comparisons With Laurite In the Bushveld and Ophiolitic Chromitites. The Canadian Mineralogist, 55 (1) 121-144 doi:10.3749/canmin.1600006 | Journal (article/letter/editorial) | pp. 121-144 (2017) DOI: 10.3749/canmin.1600006 LAURITE AND ASSOCIATED PGM IN THE STILLWATER CHROMITITES:...FOR PROCESSES OF FORMATION, AND COMPARISONS WITH LAURITE IN THE BUSHVELD AND OPHIOLITIC CHROMITITES HAZEL...QueÌbec aÌ Chicoutimi, Chicoutimi, QueÌbec G7H 2B1, Canada PETER C. FISHER* School of Earth and Ocean Sciences...QueÌbec aÌ Chicoutimi, Chicoutimi, QueÌbec G7H 2B1, Canada MICHAEL L. ZIENTEK¶ United States Geological Survey...The most common PGM observed is laurite [Ru(Os,Ir)S2], but how the laurite formed is not clearly understood | | Zaccarini, F., Pushkarev, E. V., Fershtater, G. B., Garuti, G. (2004) COMPOSITION AND MINERALOGY OF PGE-RICH CHROMITITES IN THE NURALI LHERZOLITE GABBRO COMPLEX, SOUTHERN URALS, RUSSIA. The Canadian Mineralogist, 42 (2) 545-562 doi:10.2113/gscanmin.42.2.545 | Journal (article/letter/editorial) | change from lauriteâerlichmanite-dominated to enriched in PtâPd sulfides and alloys. Laurite is the first...dominance de lauriteâerlichmanite Ă une dominance de sulfures de PtâPd et dâalliages. La laurite a cristallisĂ©...the precipitation of chromite: sulfides of the lauriteâerlichmanite series, accompanied by minor OsâIrâRu...CHRâI, and PtâFe alloy and PGE sulfides such as laurite, erlichmanite and cooperite in CHRâII. 2) Secondary...CHRâI chromitite of Nurali. A) Primary grain of laurite (L) with erlichmanite (E) rim included in fresh | | | Journal (article/letter/editorial) | comprise sulphides and alloys and are dominated by laurite (RuS2). Other sulphides are Ru-poor. Alloys includc...dominated by Ru-Os-Ir-bearing phases, particularly laurite (RuSz) and rutheniridosmine. However, some ophiolitic...Constantinideset al. (1980) detected inclusions of laurite and extremely rare erlichmanite (OsS2) in chromites...The present study has confirmed the presence of laurite as the most abundant PGM, but has also led to the...Table 1. Representative microprobe analyses of laurite HP/23 HP/36 KKR2A KKR4B KKR4C S As Os Ru Ir | | | Journal (article/letter/editorial) | the most likely platinum-group mineral (PGM) is laurite. The Pt group (Pt, Pd and Rh; hereafter E Pt) is...origin of inclusions of PGMs in chromite of the Bird River sill, by Buchanan (1976) for sulphide and oxide...Despite a probably continuous crystalliTation of laurite, no depletion of ERu can be detected through the...earlier stages dominated by the crystallization of laurite, and accumulation within the massive layers. Because...silicate liquid, and high-temperature PGMs, mainly laurite and alloys, were formed. When the precipitation | | Slansky, E., Barron, L. M., Suppel, D., Johan, Z., Ohnenstetter, M. (1991) Platinum mineralization in the Alaskan-type intrusive complexes near Fifield, N.S.W., Australia. Part 2. Platinum-group minerals in placer deposits at Fifield. Mineralogy and Petrology, 43 (3) 161-180 doi:10.1007/bf01166889 | Journal (article/letter/editorial) | isoferroplatinum, native osmium, osmiridium, iridosmine, laurite and bowieite. Isoferroplatinum is the matrix mineral...inclusions of euhedral chromite. Two sulphidic phases--laurite and bowieite--are rare and occur embedded as trapped...chromite crystal (c). 5. Euhedral crystals of laurite (arrows) in isoferroplatinum (p). 6. Bowieite (b)...isoferroplatinum, native osmium, osmiridium, iridosmine, laurite, and bowieite--kashinite. Isoferroplatinum Isoferroplatinum...analysis (Table 1). When there are inclusions of laurite crystals, isoferroplatinum contains 0.03 wt.% Ru | | | Journal (article/letter/editorial) | the resultanthybridliquid.Under theseconditions,laurite was precipitatedas an early formed cumulusphase...fractionationof the Ir group of the ultramafic Heazlewood River Complex, Tasmania. platinum-groupelementsfrom the...Research, Laurentian University, Sudbury, Ontario, Canada of the HeazlewoodRiver Complex,anda detailedacP2E...HeazlewoodRiver Complex occurrencesin the Heazlewood River Complex that is situatedwithin the northern part...Creek 2 Forth 3 Heozlewood River 4 Mt Stewerr .5 Wilson River b Huskisson River Ordovicion-Devonion ĆocombrionCambrian | | | Journal (article/letter/editorial) | close association of the principal Ir-bearing PGM (laurite) in the UG2 chromitite and the chromite layers...Reef, and suggested on textural evidence that laurite and chromite crystallization was simultaneous....relationship between these two could not be established. Laurite and ruthenoiridosmine together with base-metal...minute amounts compared with the abundance of laurite ((Ru,Ir,Os) $2), notably in or close to the chromite-rich...parts of the mineralized sequences in the Complex. Laurite has also been recorded as the dominant Ir-bearing | | | Journal (article/letter/editorial) | posits,Australia.Hudsonconcludesthat someof the River sill, which also has similarities to the critical...they believe Westdepositin theCapeSmithfoldbelt,Canada,and that Pd largelyoccursin discretemineralphases...massivesulfideoresandto a lesserextent Cryptic variation in laurite inclusions in cumulus in the matrix and disseminated...sulfide ores. In the chromitefrom the Bird River sill, Canada,are the nextpaper,Papunenintroducesnew...Finnish NiJones,andTalkington.They concludethat the laurite Cu depositsand discusses the relationships between | | | Journal (article/letter/editorial) | Ottawa, Canada, K1N 6N5 z Canada Centre for Mineral and Energy Technology, Ottawa, Canada, K1A 0G1 3...rocks; vertical-lined area, Upper Proterozoic Rokel River Series Fig. 3. a. Backscattered-electron image...minor O s - I r - Ru alloys, and erlichmanite/laurite and tulameenite (Bowles 1981). The PGM in Fig...image of cuprorhodsite and laurite inclusions in P t - F e nugget, SL-UP3. Laurite exhibits Os-rim (brighter)...(brighter). La, laurite; Cu, cuprorhodsite; Pt-Fe, matrix part of P t - F e alloy. Scale bar represents 50 | | | Report (issue) | de Maisonneuve Boulevard West MontrĂ©al, QuĂ©bec, Canada H3Z 3B8 ISBN 1-894475-27-5 Papers in this volume...Petroleum, Special Volume 54, p. 483-506. PRINTED IN CANADA by Marc Veilleux Imprimeur Inc. Preface Background...in countries like the Republic of South Africa, Canada, and Finland. Over the last five or so years, colleagues...to and immediately following my retirement from Canada Centre for Mineral and Energy Resources (CANMET)...Ed Schouwstra, Robert Scoates, Jon Winnipeg, Manitoba Johannesburg, Republic of South Africa Bloomington | | Auge, T., Salpeteur, I., Bailly, L., Mukherjee, M. M., Patra, R. N. (2002) MAGMATIC AND HYDROTHERMAL PLATINUM-GROUP MINERALS AND BASE-METAL SULFIDES IN THE BAULA COMPLEX, INDIA. The Canadian Mineralogist, 40 (2) 277-309 doi:10.2113/gscanmin.40.2.277 | Journal (article/letter/editorial) | isoferroplatinum, braggite and malanite, with sperrylite and laurite, included in pyroxene and plagioclase. The second...isoferroplatine, braggite et malanite, avec sperrylite and laurite, inclus dans les pyroxĂšnes et le plagioclase du...pentlanditeâpyrrhotite assemblage. Inclusions of laurite, sudburyite and sperrylite are commonly observed...1 contains abundant PGE sulfides that include laurite, braggite, malanite and its Nirich equivalent....minerals or uncommon end-members of known species. Laurite and hollingworthite are rare, and sperrylite is | | | Journal (article/letter/editorial) | platinum-group minerals identified were as follows: laurite (IrOsRu)S2, osmian iridium (Oslr), hollingworthite...palladian gold (CuPdAu), a Pd-Sb-Hg and HgTe phases. Laurite and osmian iridium occur preferentially in chromite...chromite. Os-Ir commonly forms composite PGM with laurite. Hollingworthite and tellurian arsenopalladinite...magmatic, but much of the PGE mineralogy except for laurite and osmian iridium in the center of chromite grains...are composed mainly of serpentine. Inclusions of laurite are frequently seen within chromite. Chemistry | | | Journal (article/letter/editorial) | through gabbro (up to 1.5 km thick), to a dolerite sill (~,0.5 km thick) and minor basalt at the top of...comprise sulphides and sulpharsenides, including laurite, irarsite, an unnamed bowieite type of (Os, Ir...inclusion consisting of a millerite and 8 grains of laurite (RuS2), enclosed by unaltered podiform chromite...phases include laurite and an unnamed, probable (Ru, Os, IrhSs. (d) Subhedral laurite located close to...with minor laurite, hollingworthite (RhAsS) and Ir-subgroup alloys. Subhedral to anhedral laurite is located | | Merkle, Roland K. W., Malitch, Kreshimir Nenadovitch, GrĂ€ser, Peter P. H., Badanina, Inna Yu. (2012) Native osmium from the Guli Massif, Northern Siberia, Russia. Mineralogy and Petrology, 104 (1) 115-127 doi:10.1007/s00710-011-0173-7 | Journal (article/letter/editorial) | worldâs largest resources of osmium metal in numerous river placers (Malitch et al. 1996, 1998, 2002; Malitch...compositional variations of Os-Ir-Ru alloys from individual river placers within the Guli Massif and to compare differences...during prospecting in the area of the Ingaringda river in the southern part of the Guli Massif (Fig. 1)...obtained from Quaternary sediments of the Ingaringda River (i.e., prospecting line L-365), and nine grains... 118 L-2), the left tributary of the Ingaringda River (Fig. 2). It is noteworthy that dunite is the only | | Barnes, Sarah-Jane, PagĂ©, P., Prichard, H. M., Zientek, M. L., Fisher, P. C. (2016) Chalcophile and platinum-group element distribution in the Ultramafic series of the Stillwater Complex, MT, USAâimplications for processes enriching chromite layers in Os, Ir, Ru, and Rh. Mineralium Deposita, 51 (1) 25-47 doi:10.1007/s00126-015-0587-y | Journal (article/letter/editorial) | are laurite and fine-grained intergrowths of pentlandite, millerite, and chalcopyrite. The laurite occurs...UniversitĂ© du QuĂ©bec Ă Chicoutimi, Chicoutimi G7H 2B1, Canada 2 School of Earth and Ocean Sciences, Cardiff...the sulfides to laurite. Keyword Platinum-group elements . Selenium . Chromite . Laurite . Ultramafic series...in the chromite layers. The first suggests that laurite, (RuOs)S2, co-crystallized with chromite from a...sulfideunderstaturated magma. The presence of laurite would enrich the rocks in Os, Ir, and Ru. The second |
|