 | | Journal (article/letter/editorial) | | Vol. 64(4), pp. 683–697 Primary zoning in pyrochlore group minerals from carbonatites D. D. HOGARTH1...of Earth Sciences, University of Ottawa, Ottawa, Canada K1N 6N5 Department of Mineralogy, The Natural History...Carleton University, Ottawa, Canada K1S 5B6 2 ABSTR ACT Pyrochlore group minerals have the general formula...OH. In this study, pyrochlore specimens were examined from carbonatites at Argor, Carillon Dam, Chilwa...by high Ta, in many cases coupled with U (here Argor, Meech Lake and Verity specimens), but Chilwa Island |  | Cordeiro, Pedro Filipe de Oliveira, Brod, José Affonso, Palmieri, Matheus, de Oliveira, Claudinei Gouveia, Barbosa, Elisa Soares Rocha, Santos, Roberto Ventura, Gaspar, José Carlos, Assis, Luis Carlos (2011) The Catalão I niobium deposit, central Brazil: Resources, geology and pyrochlore chemistry. Ore Geology Reviews, 41 (1) 112-121 doi:10.1016/j.oregeorev.2011.06.013 | Journal (article/letter/editorial) | | deposit, central Brazil: Resources, geology and pyrochlore chemistry Pedro Filipe de Oliveira Cordeiro a...July 2011 Keywords: Catalão I Carbonatite Phoscorite Nelsonite Pyrochlore a b s t r a c t The Catalão...Catalão I alkaline–carbonatite–phoscorite complex contains both fresh rock and residual (weatheringrelated)...Mine II and East Area, respectively emplaced in carbonatite and phlogopitite. Together, these orebodies contain...detail, the orebodies consist of dike swarms of pyrochlore-bearing, olivine-free phoscorite-series rocks |  | | Journal (article/letter/editorial) | | Geology, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada a r t i c l e i n f o Article history:...xxxx Keywords: Carbonatites Niobium ore deposits Pyrochlore Laterite Supergene ores a b s t r a c t This...production of Nb, with the primary St. Honoré carbonatite and other sources accounting for only for 7 and...deposit is unique with respect to the varieties of pyrochlore present; extent of replacement by other minerals;...petrographically-defined units of carbonatite contain distinct suites of pyrochlore. Bulk rock analysis for Nb |  | | Journal (article/letter/editorial) | | niobium, metallogeny of tantalum, tantaloniobates, carbonatite, nepheline syenite, alkali granite, syenite,...Siilinjärvi carbonatite and Saharjok nepheline–syenite (Zozulya et al., 2007). In the former, pyrochlore is only...(3) Brockman; (4) Katugin; (5) Mount Weld; (6) Argor; (7) Montviel; (8) Two Tom; (9) Strange Lake; (10)...Nechalacho Pitinga Brockman Katugin Mount Weld Argor Montviel Two Tom Strange Lake Tanbreez Motzfeldt...means alkali granite; as, alkali syenite; cb, carbonatite; h, hydrothermal ore; ns, nepheline syenite; |  | | 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 |
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