 | | Journal (article/letter/editorial) | | VARIATION OF PYROCHLORE-GROUP MINERALS AT THE OKA CARBONATITE COMPLEX, QUEBEC: EVIDENCE OF MAGMA MIXING? SHANNON...955 Oliver Road, Thunder Bay, Ontario P7B 5E1, Canada ABSTRACT Pyrochlore-group minerals are relatively...constituents of calcite carbonatite at the Oka Carbonatite Complex, Quebec. This complex is a member of...predominantly of calcite carbonatite and feldspathoidal silicate rocks. Mineralogical studies of the complex have...occurring within the NIOCAN and Bond Zone deposits. At Oka, pyrochlore [general structural formula: A16–xB16O48(O |  | | Journal (article/letter/editorial) | | inclusions as indicators of the magmatic origin of carbonatite rare metal and rare earth minerals Stanislav...Staromonetnyi per. 31, Moscow 109017, Russia Abstract Carbonatite melts, originating in the course of crystallization...experimental data relative to fractionation of carbonatite-forming systems and solubility of Nb and La in...carbonatites. Crystallization of RMM and REM from carbonatite melts is supported by the results of the present...van Groos (1975) was the first to suggest that carbonatite melts could be formed as primary melting in the |  | Chakhmouradian, Anton R., Reguir, Ekaterina P., Kressall, Ryan D., Crozier, Jeremy, Pisiak, Laura K., Sidhu, Ravinder, Yang, Panseok (2015) Carbonatite-hosted niobium deposit at Aley, northern British Columbia (Canada): Mineralogy, geochemistry and petrogenesis. Ore Geology Reviews, 64. 642-666 doi:10.1016/j.oregeorev.2014.04.020 | Journal (article/letter/editorial) | | com/locate/oregeorev Carbonatite-hosted niobium deposit at Aley, northern British Columbia (Canada): Mineralogy...Manitoba, 125 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada Department of Earth Sciences, Dalhousie University...1459 Oxford Street, Halifax, Nova Scotia B3H 4R2, Canada Hunter Dickinson Inc., 15th Floor, 1040 W. Georgia...Georgia Street, Vancouver, British Columbia V6E 4H8, Canada d School of Earth and Ocean Sciences, University...Finnerty Road, Victoria, British Columbia V8P 5C2, Canada b c a r t i c l e i n f o Article history: Received |  | | Journal (article/letter/editorial) | | SHORT COMMUNICATIONS Portlandite in Rocks of Carbonatite Massifs S. V. Sokolov Fedorovskii AllRussia...the Eastern Sayan, Russia, in association with calcite and fluorite [1]; – in phoscorites from the Phalaborwa...Phalaborwa Massif, South Africa, in association with calcite, clinopyroxene, amphibole, phlogopite, zeolites...and titanite [2]; – in forsterite–calcite carbonatites and calcite–for sterite–magnetite phoscorites...Kovdor Massif and in tetraferriphlogopite–amphibole–calcite car bonatites from the Vuoriyarvi Massif, Kola |  | | Journal (article/letter/editorial) | | constraints on crystallization temperatures of carbonatite magmas Elizabeth A. Haynes a,1, David P. Moecher...isotope compositions and fractionations between calcite (Cc) and magnetite (Mt), diopside-rich clinopyroxene...carbonatites from Oka (Canada), Magnet Cove (USA), Jacupiranga (Brazil), and Essonville (Canada), to obtain...temperatures are obtained from Cc – Mt fractionations from Oka (745 – 770 jC) and Cc – Mnt fractionations from Magnet...coarse-grained, euhedral magnetite phenocrysts and calcite from Jacupiranga are 700 jC. In samples that contain |  | | Journal (article/letter/editorial) | | BC, Canada; bSchool of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada; Natural...Natural Resources Canada NRCan, Geological Survey of Canada, Sidney, BC, Canada ABSTRACT ARTICLE HISTORY...alkaline silicate igneous rocks, forming alkaline-carbonatite complexes, but some occur as isolated pipes,...indicator mineral surveys Carbonatites and alkaline-carbonatite complexes are the main sources of rare earth... Nine per cent of carbonatites and alkaline-carbonatite complexes contain active or historic mines, making |  | | Journal (article/letter/editorial) | | “Coltan,” that caused Ta mines in Australia and Canada to be placed on care and maintenance. More recently...placer deposits and weathered crusts overlying carbonatite and peralkaline complexes account for the majority...majority of Ta production. Several carbonatite-related deposits (e.g. Upper Editorial handling: D. Huston... 3800 Finnerty Road (Ring Road), Victoria, BC, Canada V8P 5C2 G. J. Simandl (*) British Columbia Ministry...Victoria, BC, Canada V8W 9N3 e-mail: george.simandl@gov.bc.ca Fir and Crevier, Canada) are being considered |  | | Journal (article/letter/editorial) | | SEM-decrepitate analysis of fluid inclusions from Oka, Quebec, Canada IAIN M. SAMSON,’A. E. WILLIAMS-J• NES,~and...University of Windsor, Windsor, Ontario NYB 3P4, Canada ‘Department of Earth and Planetary Sciences, McGill...McGill University, Montreal, Quebec H3A 2A7, Canada (Received March 14, 1994; accepted in revised form... Abstract-Apatite and calcite from calcite carbonatites at Oka, Quebec, Canada, contain primary, liquidvapour...constituents of the fluids. Fenites around the Oka complex are characterized by the replacement of quartz-alkali |  | | Journal (article/letter/editorial) | | hydrothermal fluids in the Oka carhonatite, Evidence from fluid inclusions Quebec, Canada: IAINM. SAMSON,’WEINING...accepted in revised,fimn N9B 3P4, Canada Quebec H3A 2A7, Canada Februury 2 1. 1995 ) Abstract-Fluid...in apatite, monticellite, and calcite from the Oka carbonatite complex generally comprise either aqueous...contain a variety of trapped solids, including calcite, strontianite, nahcolite, and mirabilite. Microthermometry...the host minerals was monticellite + apatite -+ calcite, which, when combined with fluid inclusion data |  | | Journal (article/letter/editorial) | | Keywords: Pyrochlore Betafite Perovskite Kimberlite Carbonatite Venezuela a b s t r a c t Oscillatory-zoned...zoned spinel, phlogopite, carbonates (dolomite, calcite, magnesite), apatite, tetraferriphlogopite, Fe–Ni–Cu-sulfides...crystals of the pyrochlore-group mineral. Cal–calcite, other abbreviations see Fig. 2. Numbered points...spinel, dolomite, phlogopite–tetraferriphlogopite, calcite, magnesite, pyrochlore, Fe–Ni–Cu-sulfides and apatite...groundmass, usually contains rounded grains of calcite in the central parts. Both carbonates are rich |  | | Journal (article/letter/editorial) | | Springer-Verlag 1984 A periclase-dolomite-calcite carbonatite from the Oka complex, Quebec, and its calculated volatile...USA Abstract. The eutectic mineral assemblage calcite-dolomite- periclase-apatite-forsterite-magnes...te-pyrrhotite-alabandite in a carbonatite dike within the Oka complex, Quebec, buffers the fugacities...is consistent with experiments on synthetic carbonatite systems (e.g. Fanelli et al. 1981), although...in carbonatite petrogenesis by showing that excess H20 lowers the melting temperature of calcite to geologically |  | Mangler, Martin F., Marks, Michael A.W., Zaitzev, Anatoly N., Eby, G. Nelson, Markl, Gregor (2014) Halogens (F, Cl and Br) at Oldoinyo Lengai volcano (Tanzania): Effects of magmatic differentiation, silicate–natrocarbonatite melt separation and surface alteration of natrocarbonatite. Chemical Geology, 365. 43-53 doi:10.1016/j.chemgeo.2013.11.027 | Journal (article/letter/editorial) | | those of associated silicate rocks and to various calcite carbonatites from eleven occurrences worldwide...2010). The low viscosities and low densities of carbonatite melts favor their rapid rise to the surface and...halogen geochemistry of the mantle. We also analyzed calcite carbonatites from eleven occurrences worldwide...authors argue that the genetic processes are more complex: multiple immiscible liquids (Mitchell, 1997; Sharygin...fresh natrocarbonatite L → pirssonite carbonatite → calcite carbonatite. Major mineral phases along with known |  | | Journal (article/letter/editorial) | | University, 955 Oliver Road, Thunder Bay, Ontario, Canada P7B 5E1 825 Fitzpatrick Road, Nashville, TN 37214...groundmass silicates. K EY WORDS : natrocarbonatite, carbonatite, cuspidine, niocalite, monticellite, sulphides...concentrations of silicates and oxides (Fig. 4). carbonatite magma. Thus, they are not considered in this...(Peterson, 1990; Church and Jones, 1995), the Oka carbonatite (this work), diverse kimberlites and alnöites...Monticellite from diverse samples of the Oka calcite carbonatite (Table 2) has a limited range in FeO content |  | | Journal (article/letter/editorial) | | applied to apatite from the Jacupirangaalkaline complex Ronnnro Y. SlNros* Department of the GeophysicalSciences...wt0/0.We have applied the method to apatite from carbonatite (=6.3-9.4 wto/oCOr) and metasomatic (10.6-1.0...3 wto/oCOr) rocks from the Jacupirangaalkaline complex. The results show that higher concentration of...to metasomatism related to the intrusion of carbonatite from Jacupiranga.Major and trace elementsof the...near 1440 cm-'' Besidesthe band at 1440 cm-', calcite also has infrared bands at 1 8 0 0 "8 7 2 .a n |  | | Journal (article/letter/editorial) | | S.A. Pb isotope geochemistry of the Fen carbonatite complex, S.E. Norway: Age and petrogenetic implications...carbonatites and associated silicate rocks from the Fen complex, southeast Norway, define a whole-rock Pb/Pb isochron...contamination taking place during differentiation of carbonatite magma in the middle to shallow crust. the authors...1985; Fen, Norway: ANDERSEN, 1987; Borden, Ontario, Canada: BELLet al., 1987; Alno, Sweden: Authors’ unpublished...metasomatic rocks for which relationships with the carbonatite are well established (BRUECKNERand REX, 1980; |  | | Journal (article/letter/editorial) | | Bulletin No. 122 Gardiner intrusion, an ultramafic complex at Kangerdlugssuaq, East Greenland by Wolfgang... 40.00 o. 114 Ferri-sepiolite in bydrothenna1 calcite-quartz-cbalcedony vein on l1p uaq in W t Greenland...McLean. o. 122 Gardiner intrusion, an ultramafic complex at Kangerdlugssuaq Bast Greenland. 1977 by W. Frisch...Bulletin No. 122 Gardiner intrusion, an ultramafic complex at Kangerdlugssuaq, East Greenland by Wolfgang... Abstract The Gardiner intrusion is an ultramafic complex in the inner region of Kangerdlugssuaq fjord, forming |  | | Journal (article/letter/editorial) | | metasomatism to carbonatite eruptions involve debates about the following issues. (1) Are carbonatite magmas primarily...(2) Are parental carbonatite magmas calcic, dolomitic, or sodic? (3) Are carbonatite magmas derived in...data provide the following constraints: primary carbonatite magmas formed in mantle lherzolite at depths...richer in calcite can be formed only in wehrlites at shallower depths; immiscible carbonatite magmas formed...a residual carbonatitic liquid, precipitating calcite and becoming enriched in Na 2 C0 3 ; the fractionation |  | | Journal (article/letter/editorial) | | Petrology and geochemistry of the carbonatite and syenite complex of Lueshe (N.E. Zaire) H. v. MARAVIC&...and geochemist~T of the carbonatitc and syenite complex of Lueshe (N E. Zaire). Lithos 13, 159-170. Oslo...Oslo. ISSN 0024-4937. The Lueshe carbonatite is intr~lded into schists which probably belong to the 13urundia~-system...weak fenitisafion at the contact to the carbonatite complex. Petrographical and chemical investigations...the different types of syenite of the alke,line complex belong mainly to the miaskitic group. Pyrochlore |  | | Journal (article/letter/editorial) | | low-pressure eutectic for the coprecipitation of calcite, portlandite, and periclase/ brucite (with H2O-rich...model for the existence and crystallization of carbonatite magmas. Attempts to determine conditions for...liquidus to temperatures below the crest of the calcite-dolomite solvus; the vapor-saturated liquidus surface...the ®eld boundary for liquids coexisting with calcite and periclase reaches a peritectic at 880 C,...eutectic at 659 C for the coprecipitation of calcite, dolomite and periclase (brucite should replace |  | Wu, Fu-Yuan, Yang, Yue-Heng, Li, Qiu-Li, Mitchell, Roger H., Dawson, J. Barry, Brandl, Günther, Yuhara, Masaki (2011) In situ determination of U–Pb ages and Sr–Nd–Hf isotopic constraints on the petrogenesis of the Phalaborwa carbonatite Complex, South Africa. Lithos, 127 (1) 309-322 doi:10.1016/j.lithos.2011.09.005 | Journal (article/letter/editorial) | | constraints on the petrogenesis of the Phalaborwa carbonatite Complex, South Africa Fu-Yuan Wu a,⁎, Yue-Heng Yang...Department of Geology, Lakehead University, Ontario,Canada P7B 5E1 School of Geosciences, University of Edinburgh...Sr–Nd–Hf isotopes Carbonatite Phalaborwa a b s t r a c t The Phalaborwa carbonatite Complex, situated in...pyroxenites, phoscorite and carbonatite (banded and transgressive). The complex is transected by mafic dykes...plug-like bodies outside of the border of the main complex, and the later mafic dyke have “similar” emplacement |  | | Journal (article/letter/editorial) | | the Tchivira carbonatites occur in a plutonic complex, the Bonga carbonatites represent hypabyssal carbonatites...also increase. Pyrochlores from Catanda display complex textures. They generally have a rounded corroded...volcanic carbonatites. K EY WORDS : Angola, carbonatite, zonation in pyrochlore, fluorine, high field strength...mineralization is associated with the early stages of carbonatite activity and carbonatites are commonly rich in...or enrichment in Nb is a good criterion for carbonatite identification. Niobium is usually concentrated |  | Casillas, Ramón, Demény, Attila, Nagy, Géza, Ahijado, Agustina, Fernández, Carlos (2011) Metacarbonatites in the Basal Complex of Fuerteventura (Canary Islands) The role of fluid/rock interactions during contact metamorphism and anatexis. Lithos, 125 (1) 503-520 doi:10.1016/j.lithos.2011.03.007 | Journal (article/letter/editorial) | | e / l i t h o s Metacarbonatites in the Basal Complex of Fuerteventura (Canary Islands). The role of...The Basal Complex of Fuerteventura, in the Canary Islands, contains an ultra-alkaline complex formed by...melteigites, ijolites, alkaline gabbros, syenites and carbonatite dykes cut by a basaltic dyke swarm. A later basaltic...in the contact-metamorphosed silicate rocks. Carbonatite dykes have been found in the metamorphic aureole... monticellite, diopside, vesuvianite, garnet, calcite, perovskite, alabandite, pyrrhotite and Nb–Zr–Ca |  | Amores-Casals, , Melgarejo, , Bambi, , Gonçalves, , Morais, , Manuel, , Neto, , Costanzo, , Molist, (2019) Lamprophyre-Carbonatite Magma Mingling and Subsolidus Processes as Key Controls on Critical Element Concentration in Carbonatites—The Bonga Complex (Angola) Minerals, 9 (10) 601 doi:10.3390/min9100601 | Journal (article/letter/editorial) | | minerals Article Lamprophyre-Carbonatite Magma Mingling and Subsolidus Processes as Key Controls on...Element Concentration in Carbonatites—The Bonga Complex (Angola) Sandra Amores-Casals 1,2, *, Joan-Carles... Abstract: The Bonga complex is composed of a central carbonatite plug (with a ferrocarbonatite...ferrocarbonatite core) surrounded by carbonatite cone sheets and igneous breccias of carbonatitic, fenitic, phoscoritic...mesostase. To reconstruct the dynamics of the complex, the pyrochlore composition and distribution have |  | Doroshkevich, Anna G., Veksler, Ilya V., Klemd, Reiner, Khromova, Elena A., Izbrodin, Ivan A. (2017) Trace-element composition of minerals and rocks in the Belaya Zima carbonatite complex (Russia): Implications for the mechanisms of magma evolution and carbonatite formation. Lithos, 284. 91-108 doi:10.1016/j.lithos.2017.04.003 | Journal (article/letter/editorial) | | of minerals and rocks in the Belaya Zima carbonatite complex (Russia): Implications for the mechanisms...mechanisms of magma evolution and carbonatite formation Anna G. Doroshkevich, Ilya V. Veksler, Reiner Klemd, Elena...of minerals and rocks in the Belaya Zima carbonatite complex (Russia): Implications for the mechanisms...mechanisms of magma evolution and carbonatite formation, LITHOS (2017), doi:10.1016/j.lithos.2017.04.003 This...of minerals and rocks in the Belaya Zima carbonatite complex (Russia): T implications for the mechanisms |  | | Journal (article/letter/editorial) | | Igaliko Nepheline-Syenite Complex of Gardar age (1300-l 120 Ma) includes carbonatite, lamprophyre, basalt...phonolite and rhyolite dykes. The relationship of carbonatite magma to the other magma types in this area is...series of dykes from the Igaliko Nepheline-Syenite Complex which are pertinent to the origin of these carbonatites...the dykes is consistent with closely related carbonatite and ultramafic lamprophyre magma genesis, prior...lamprophyres. Keywords: carbonatites; 1. Introduction Carbonatite Gardar; isotopes; geochemistry; and geological |
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Oka complex, Deux-Montagnes RCM, Laurentides, Québec, Canada