 | | Journal (article/letter/editorial) | | PYROCHLORE-GROUP MINERALS FROM THE LUESHE AND ARAXÁ (BARREIRO) CARBONATITES BY 57Fe MÖSSBAUER SPECTROSCOPY...Lueshe in the Democratic Republic of Congo, and Araxá in Brazil. In contrast to the common assumption that...O2– and 1 OH–, whereas in bariopyrochlore from Araxá, the unusually large value of the quadrupole splitting...Republic of Congo, and the Barreiro carbonatitic complex at Araxá, in Brazil, using 57Fe Mössbauer spectroscopy...bariopyrochlore with BaO up to 19% (Mariano et al. 1997) from Araxá was used for the present investigation. All samples |  | Gomide, Caroline Siqueira, Brod, José Affonso, Junqueira-Brod, Tereza Cristina, Buhn, Bernhard Manfred, Santos, Roberto Ventura, Barbosa, Elisa Soares Rocha, Cordeiro, Pedro Filipe Oliveira, Palmieri, Matheus, Grasso, Carla Bertuccelli, Torres, Murilo Gomes (2013) Sulfur isotopes from Brazilian alkaline carbonatite complexes. Chemical Geology, 341. 38-49 doi:10.1016/j.chemgeo.2013.01.006 | Journal (article/letter/editorial) | | de Brasília (UnB), CEP 70910-900, Brasília, DF, Brazil Instituto de Estudos Sócio-Ambientais, Universidade... Caixa Postal 131, CEP 74001-970, Goiânia, GO, Brazil Laboratório Multiusuário de Microscopia de Alta... Caixa Postal 131, CEP 74001-970, Goiânia, GO, Brazil d Anglo American, Mineração Catalão Ltda, Rodovia...s/n - Fazenda Chapadão, Zona Rural, Ouvidor, GO, Brazil e Vale Fertilizantes, Fazenda Chapadão, s/n - Zona...Zona Rural, CEP 75701-970, Catalão, GO, Brazil f Universidade Católica de Brasília, QS 07 lote 01 EPCT |  | Gomes, Celso de Barros, Comin-Chiaramonti, Piero, Azzone, Rogério Guitarrari, Ruberti, Excelso, Rojas, Gaston Eduardo Enrich (2018) Cretaceous carbonatites of the southeastern Brazilian Platform: a review. Brazilian Journal of Geology, 48 (2) 317-345 doi:10.1590/2317-4889201820170123 | Journal (article/letter/editorial) | | Universidade de São Paulo – USP, São Paulo (SP), Brazil. E-mails: cgomes@usp.br, rgazzone@usp.br, exrubert@usp...carbonatite occurrences of different regions of Brazil, Paraguay and Bolivia. Locality Occurrence Petrography...Petrography Mineralogy Age References BRAZIL Ribeira Valley 1 Barra do Itapirapuã Dike, vein, breccia..., Flo, Op (Hm, Il), Ch n.d. 75, 76 15 Araxá (Barreiro) Stock, dike Mg-ca, Ca-ca, Fe-ca Gl, Py,...Toniolo et al. (2013); 76, Monteiro et al. (2016); Araxá: 77, Issa Filho et al. (1984); 78, Traversa et al |  | | Journal (article/letter/editorial) | | Tourmaline-Bearing Gold Deposit' Passagemde Mariana (Brazil) ROlAnD FnE•SCI•I• A•D P• Abstract A facies...the "Quadril/ttero Ferrlfero," State of Minas Gerais, Brazil. Exploited sincethe end of the seventeenth...Rocksin the Quadrilfitero Ferrlfero(MinasGerais,Brazil) Accordingto Dorr (1969)and SlightlyModifiedby...J. V. N. et al. (1969) Fm Lithology Itacolomi Minas Orthoquartzite, protoquartzite, conglomerate, grit...phyllite, phyllitic quartzite Piracicaba Sabara Barreiro TaboSes F{cho do Funil Cercadinho •Itabira Gandarela |  | | Report (volume) | | workshop held December 1-10,1986, in Belo Horizonte, Brazil, was hosted by the Institute Brasileiro de Mineragao...Quintas, Mineragao Morro Velho Club, Nova Lima, Brazil December 4,1986 1. 2. 3. 4. 5. Sergio C. Guedes...Quadrilatero Ferrffero, Minas Gerais, Brazil Workshop: Belo Horizonte, Brazil, December 1-10,1986 Sponsors:...Data Gold deposits related to greenstone belts in Brazil Deposit modeling workshop; Part A Excursions /...deposits related to greenstone belts in Brazil, Belo Horizonte, Brazil, 1986, by Charles H. Thorman and Eduardo |  | | Journal (article/letter/editorial) | | Weathered crusts overlying carbonatite complexes in Brazil and one hard rock carbonatite deposit in Canada...currently Mibra Mine, Volta Grande (Brazil), the Pitinga Mine (Brazil) and Marropinno (Mozambique). The...Papp (2009a, 2011a, 2013a) 1200 1000 Australia Brazil Canada 800 Rwanda Mozambique 600 Other World...Russia and India. Production comes primarily from Brazil. Production from Canada and other 500 400 300...and Papp (2009a, 2011b, 2013b) 70000 60000 50000 Brazil 40000 Canada 30000 Other World Total 20000 |  | | Report (issue) | | Development of the Quadrilatero Ferrifero Minas Gerais, Brazil GEOLOGICAL SURVEY PROFESSIONAL PAPER 641-A...the Departamento Nacional da Producao Mineral of Brazil under the auspices of the Agency for International...Development of the Quadrilatero Ferrifero Minas Gerais, Brazil By JOHN VAN N. DORR 2d REGIONAL GEOLOGY...GEOLOGY OF THE QUADRILATERO FERRIFERO, MINAS GERAIS, BRAZIL GEOLOGICAL SURVEY PROFESSIONAL PAPER 641-A...the Departamento Nacional da Producao Mineral of Brazil under the auspices of the Agency for International |  | | Report (issue) | | Horizonte, Ibirite, and Macacos Quadrangles Minas Gerais, Brazil GEOLOGICAL SURVEY PROFESSIONAL PAPER 341-D...the Departamento Nacional da Producao Mineral of Brazil under the auspices of the International Cooperation...Quadrangles Minas Gerais, Brazil By JOEL B. POMERENE GEOLOGY AND MINERAL RESOURCES OF PARTS OF MINAS GERAIS...GERAIS, BRAZIL GEOLOGICAL SURVEY PROFESSIONAL PAPER 341-D Prepared in cooperation with the Departamento...Departamento Nacional da Producao Mineral of Brazil under the auspices of the International Cooperation Administration |  | | Report (issue) | | the Departmento National da Produ^ao Mineral of Brazil under the auspices of the Agency for International...Ferrifero, Minas Gerais, Brazil By NORMAN HERZ REGIONAL GEOLOGY OF THE QUADRILATERO FERRIFERO, MINAS GERAIS...GERAIS, BRAZIL GEOLOGICAL SURVEY PROFESSIONAL Prepared in cooperation with the Departmento Nacional da Produqao...Produqao Mineral of Brazil under the auspices of the Agency for International Development of the United...Ferrifero, Minas Gerais, Brazil. (Regional geology of the Quadrilatero Ferrifero, Minas Gerais, Brazil) (Geological |  | | Report (issue) | | chart showing niobium resources and reserves in Brazil, Canada, and the United States...................lithium-cesium-tantalum (LCT)type pegmatites). Brazil and Canada are the leading nations that produce...produce niobium mineral concentrates, but Brazil is by far the leading producer, accounting for about 90 percent...from weathered material derived from carbonatites. Brazil and Canada also have the largest identified niobium...Malawi, Russia, and South Africa. Australia and Brazil have been the leading producers of tantalum mineral |  | | Report (issue) | | led by, in decreasing order of reserves, China, Brazil, Australia, and India (Gambogi, 2015). Australia...Western Australia, Australia, and Araxá in the State of Minas Gerais, Brazil). The principal REE minerals...20° 10° 0° 10° 20° 30° 40° 50° 60° 80° Araxá Buena Norte mining district Zandkopsdrift Lofdal...the Araxá deposit, which overlies the Barreiro carbonatite complex in the State of Minas Gerais, Brazil;...Catalão I carbonatite complex in the State of Goiás, Brazil; and the Mount Weld carbonatite in Western Australia |  | | Report (issue) | | Igneous Rocks of the Quadrilatero Ferrifero, Minas Gerais, Brazil GEOLOGICAL SURVEY PROFESSIONAL PAPER 641-B...the Departmento Nacional da Producao Mineral of Brazil under the auspices oj the Agency for International...Ferrifero, Minas Gerais, Brazil By NORMAN HERZ REGIONAL GEOLOGY OF THE QUADRILATERO FERRlFERO, MINAS GERAIS...GERAIS, BRAZIL GEOLOGICAL SURVEY PROFESSIONAL PAPER 641-B Prepared in cooperation with the Departmento...Departmento Nacional da Producao Mineral of Brazil under the auspices of the Agency for International Development |  | | Journal (article/letter/editorial) | | in turn range from calcite-rich types through ankerite- and siderite- dominated ferrocarbonatites, with...has previously been metasomatically enriched (Barreiro and Cooper, 1987). Crustal interaction is limited...and post-cumulus processes. Lithos, 31, 207-25. Barreiro, B.A. and Cooper, A.F. (1987) A Sr, Nd, and Pb...Southwest Namibia. Geology, 19, 1193-6. Cooper, A.F., Barreiro, B.A., Kimbrough, D.L. and Mattinson, J.M. (1987)...Carbonatites, Pocos de Caldas, Minas Gerais, Brazil. Ministerio das Minas e Energia, 188, 207-12. Gold |  | | Journal (article/letter/editorial) | | of compositions from calcite- through dolomite–ankerite- to siderite- and norsethite-rich varieties. Carbonates...allant de roches à dominance de calcite, dolomite– ankerite, sidérite ou de norsethite. Des carbonates et...Cooper 1971). More recently, U–Pb and Rb–Sr ages (Barreiro & Cooper 1987, Cooper et al. 1987) and K–Ar studies...complex. Brown weathering varieties are dominated by ankerite or siderite, cream or whitish varieties contain...interpreted to be magmatic), calcite, Mn-rich ankerite– calcite and ferroan rhodochrosite – manganoan |  | de Abreu Cunha, Ioná, Misi, Aroldo, Babinski, Marly, Iyer, Sundaram Sankara S. (2007) Lead isotope constraints on the genesis of Pb–Zn deposits in the Neoproterozoic Vazante Group, Minas Gerais, Brazil. Gondwana Research, 11 (3) 382-395 doi:10.1016/j.gr.2006.02.008 | Journal (article/letter/editorial) | | deposits in the Neoproterozoic Vazante Group, Minas Gerais, Brazil Ioná de Abreu Cunha a , Aroldo Misi a,⁎...Universidade Federal da Bahia, Salvador, BA 40210-340, Brazil Centro de Pesquisas Geocronológicas, Instituto...Rua do Lago, 562, São Paulo, CEP 05508-080, SP, Brazil c Department of Physics and Astronomy, University...the western border of the São Francisco Craton, Brazil, hosts the largest Zn–Pb district in South America...deposits; Vazante Group; Neoproterozoic metallogeny; Brazil 1. Introduction The Neoproterozoic Vazante Group |  | Melgarejo, Joan C., Costanzo, Alessandra, Bambi, Aurora C.J.M., Gonçalves, Antonio O., Neto, Andrés B. (2012) Subsolidus processes as a key factor on the distribution of Nb species in plutonic carbonatites: The Tchivira case, Angola. Lithos, 152. 187-201 doi:10.1016/j.lithos.2012.06.024 | Journal (article/letter/editorial) | | economic point of view: the Seis Lagos deposit in Brazil, the largest Nb deposit in the world, has reserves...Minor replacement of dolomite by hydrothermal ankerite (Ank) occurs at the grains borders. J.C. Melgarejo...in the proximity of the pyrochlore crystal c) Ankerite (Ank) is mantled and veined by hydrothermal dolomite...mixture of calcite (Cal2) and goethite (Gth). d) Ankerite (Ank) replaced by quartz (Qtz) associated with...intrusion, the amount of fluorite decreases and that of ankerite increases, giving rise to ankeritized carbonatite |  | Torró, L., Villanova, C., Castillo, M., Campeny, M., Gonçalves, A. O., Melgarejo, J. C. (2012) Niobium and rare earth minerals from the Virulundo carbonatite, Namibe, Angola. Mineralogical Magazine, 76 (2) 393-409 doi:10.1180/minmag.2012.076.2.08 | Journal (article/letter/editorial) | | centimetres and contain quartz, baryte, calcite, ankerite and dolomite (Fig. 4c). In the vicinity of the...textures of the carbonatites 395 Calcite and ankerite are the dominant minerals in the Virulundo carbonatites...(a) Carbonatite breccias, with dark fragments of ankerite carbonatites (Fc) in a calcite matrix (Cc). (b)...than 0.5 mm across. Quartz, calcite, dolomite and ankerite are the dominant minerals in the hydrothermal...crystals, intergrown with quartz and dolomite or ankerite. Strontianite tends to be euhedral and occurs |  | | Report (issue) | | the Nova Lima and Rio Acima Quadrangles Minas Gerais, Brazil GEOLOGICAL SURVEY PROFESSIONAL PAPER 341-A...the Departamento N acional da Producao Mineral of Brazil under the auspices of the International Cooperation...Quadrangles Minas Gerais, Brazil By JACOB E. GAIR GEOLOGY AND MINERAL RESOURCES OF PARTS OF MINAS GERAIS, BRAZIL...the Departamento Nacional da Producao Mineral of Brazil under the auspices of the International Cooperation...Graywacke6 53 Ore deposits 6 Quartz-dolomite and quartz-ankerite rock (lapa 53 Gold 6 23 seca) 6 53 6 Morro Velho |  | | Journal (issue) | | mining-themed park was approved in 2000, and the Minas de Almadén y Arrayanes The Mineralogical Record...of the mines has been the responsibility of the Minas de Almadén y Arrayanes (MAYASA), a State-owned company...was at that time Governor of the Almadén mines (Barreiro, 1992). From 1776 to 1784, King Carlos III commissioned...others, several specimens of cinnabar from Almadén (Barreiro, 1992). In 1791, the Assistant Director of the...thin layer of galena, giving them 34 Figure 45. Ankerite crystals (rhombohedral) to 1 mm with minor cinnabar |  | | Report (issue) | | Monlevade and Rio Piracicaba Quadrangles, Minas Gerais Brazil GEOLOGICAL SURVEY PROFESSIONAL PAPER 341-E...the Departamento Nacional da Producao Mineral of Brazil under the auspices of the Agency for International...Quadrangles, Minas Gerais Brazil By ROBERT G. REEVES GEOLOGY AND MINERAL RESOURCES OF PARTS OF MINAS GERAIS, BRAZIL...the Departamento Nacional da Producao Mineral of Brazil under the auspices of the Agency for International...____________ Itabirite. - _______________________ Minas Series_-_--_____--_______--___-__-_ Caraga Grou |  | | Journal (article/letter/editorial) | | petrogenetically evolved, with assemblages dominated by ankerite, siderite and Ba-Sr-REE carbonates. Microprobe...intrusion of mantle-derived lamprophyric magmas (Barreiro and Cooper, 1987) is thought to relate to tensional...ranging from calcite-, through calcite-dolomite-, to ankerite- and sideritedominated mineralogies (Cooper, 1986;... Baotite also occurs in thin veins of calcite-ankerite carbonatite exposed in the nearby Burke River...OU58761: Norsethite-rich carbonatite Norsethite-ankerite-Ca Ba carb•nate-aegirine-arfveds•nite-a•bite- |  | 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) | | the supply market is essentially controlled by Brazil (N90% since 2000: IBRAM, 2012; Moreno, 2011), it...their own sources of this element independent of Brazil (e.g., Dzhumaylo and Skorobogat'ko, 2013; Pistilli...Ta)2O6] from granites and pegmatites of Africa and Brazil (Bastos Neto et al., 2009; Melcher et al., in this...Johnson/ Pawnee Co's, Nebraska, USA Barreiro, Araxá, Minas Gerais, Brazil Boa Vista and other projects, Catalão...Catalão I and II, Goiás, Brazil Neoprot.? Upper Permian? Lateritic profile with reduced horizons over |  | | Journal (article/letter/editorial) | | nio bium and several deposits such as Araxá and Cataláo (Brazil), Saint Honoré (Canada) and Lueshe (Zaire...early calcite carbonatites, late calcite, calciteankerite and sideriterhodoch rosite carbonatites and...calcite car bonatites and late calcite and calcite ankerite carbo natites. In early carbonatites it is xenocristic...of the Barreiro Car bonatitic Complex, Araxa, MG, Brazil”, in Carbonatitic Complexes of Brazil: Geology |  | Broom-Fendley, Sam, Wall, Frances, Spiro, Baruch, Ullmann, Clemens V. (2017) Deducing the source and composition of rare earth mineralising fluids in carbonatites: insights from isotopic (C, O, 87Sr/86Sr) data from Kangankunde, Malawi. Contributions to Mineralogy and Petrology, 172 (11) doi:10.1007/s00410-017-1412-7 | Journal (article/letter/editorial) | | et al. 1998, 2002, 2015); Barra do Itapirapuã, Brazil (Andrade et al. 1999; Ruberti et al. 2008); and...carbonatites, which comprise: (a) Light-coloured ankerite/ferroan dolomite carbonatite with little REE mineralisation...carbonatite BM number Ankerite Strontianite Strontianite Ankerite Ankerite Dolomite Strontianite Monazite-(Ce)...Monazite-(Ce) Ankerite Ankerite Ankerite Ankerite Strontianite Calcite Calcite Ankerite Ankerite Ankerite Ankerite...Ankerite Dolomite Ankerite Ankerite Strontianite Calcite Dolomite Dolomite Insoluble residue Dolomite Insoluble |  | Cooper, Alan F., Collins, Alice K., Palin, J. Michael, Spratt, John (2015) Mineralogical evolution and REE mobility during crystallisation of ancylite-bearing ferrocarbonatite, Haast River, New Zealand. Lithos, 216. 324-337 doi:10.1016/j.lithos.2015.01.005 | Journal (article/letter/editorial) | | and blocky patches of calcite and a more Ferich ankerite. The calcite is interpreted as the product of...dolomite and hematite, of the oxidation of primary ankerite during interaction with hydrothermal fluids. Late...indicates this stage of crystallisation post-dated the ankerite to dolomite replacement. The carbonatites, as...carbonate assemblages, with calcite, dolomite, ankerite, siderite, norsethite, daqinshanite, strontianite...patches of a second, more ferroan dolomite or ankerite (Fig. 2B, C. See later discussion). Patches of |
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