 | | 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 |  | 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) | | o r ev The Catalão I niobium deposit, central Brazil: Resources, geology and pyrochlore chemistry Pedro...Instituto de Geociências, Brasília-DF, 70910-900 Brazil Universidade Federal de Goiás, Campus Samambaia...Federal de Goiás, Goiânia-GO, 74001-970 Brazil Anglo American Brazil LTDA, Avenida Interlândia 502, Setor...Setor Santa Genoveva, Goiânia-GO, 74672-360 Brazil a r t i c l e i n f o Article history: Received 24...Elsevier B.V. All rights reserved. 1. Introduction Brazil is the largest niobium producer in the World due |  | | Report (issue) | | REPORT Brazil Investigations (IR)BR-76 NIOBIUM (COLUMBIUM) AND TANTALUM RESOURCES OF BRAZIL U. S. Geological... NIOBIUM (COLUMBIUM) AND TANTALUM RESOURCES OF BRAZIL By Max G. White U.S. Geological Survey CONTENTS...deposits ............................... 10 The Barreiro (Araxa) deposit ..................... 10 The...Distribution of alkalic intrusives in Southern Brazil .. 16 Alkalic intrusions in the western side of...geologic setting of deposits .............. 24 Minas Gerais ...................................... 24 Bahia |  | 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 |  | | 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 |  | Cordeiro, Pedro F.O., Brod, José A., Dantas, Elton L., Barbosa, Elisa S.R. (2010) Mineral chemistry, isotope geochemistry and petrogenesis of niobium-rich rocks from the Catalão I carbonatite-phoscorite complex, Central Brazil. Lithos, 118 (3) 223-237 doi:10.1016/j.lithos.2010.04.007 | Journal (article/letter/editorial) | | Catalão I carbonatite-phoscorite complex, Central Brazil Pedro F.O. Cordeiro a,⁎, José A. Brod a,b, Elton...Geociências, Universidade De Brasília, Brasília-DF, Brazil Instituto De Estudos Socio-Ambientais, Universidade...Universidade Federal De Goiás, Goiânia-GO, Brazil a r t i c l e i n f o Article history: Received 28 July...Igneous Province (APIP), central Brazil, particularly in the Catalão I and Araxá carbonatite-bearing complexes...available by Mineração Catalão (Anglo American Brazil) from the Catalão I niobium deposit provide an |  | | 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...Trace–1.0 Orthorhombic Lueshite (Perovskite) (NaNbO3) Loparite (Perovskite) ([Ce,La,Na,Ca,Sr][Ti,Nb]O3)...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 |  | | Journal (article/letter/editorial) | | tropicaland•equatorialcountriessuch as Australia,BelgianCongo,Brazil, India, and Nigeria, whereweatheringis rapid and...pyrochlore with lesseramountsin the titanium minerals,perovskite,loparite, fersmannite and in the zirconiumminerals...niobium mineral Lueshite (NaNbOa) isomorphous with perovskite (CaTiOs) was recently found in this deposit and...manganese-iron ores from Lueshe (Belgian Congo), Barreiro (Brazil), Kaiserstuhl(Germany) and from a new depositin...grabenareas,in the Mesozoicprovinceof Southeast Brazil, and in manyothercountriesof the world. The grabenareaandits |  | | 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...loparite (table O2), which is a mineral of the perovskite group. This loparite reportedly contains more...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; |  | GIBSON, S. A., THOMPSON, R. N., LEONARDOS, O. H., DICKIN, A. P., MITCHELL, J. G. (1995) The Late Cretaceous Impact of the Trindade Mantle Plume: Evidence from Large-volume, Mafic, Potassic Magmatism in SE Brazil. Journal of Petrology, 36 (1) 189-229 doi:10.1093/petrology/36.1.189 | Journal (article/letter/editorial) | | GEOCIENCIAS, UNIVERSIDADE DE BRASILIA, 70910 BRASILIA DF, BRAZIL 'DEPARTMENT OF GEOLOGY, McMASTER UNIVERSITY, is8o...plutonic comAlto Paranaiba Igneous Province, in SE Brazil, is one of the plexes at ~ 85 Ma. Reconstructions...is one Late Cretaceous alkaline magmatism in SE Brazil may have of several Cretaceous alkaline igneous...around the margin of the Parana sedimentary basin in Brazil subcontinental lithosphere. Heat penetrating the...from Large-volume, Mafic, Potassic Magmatism in SE Brazil JOURNAL OF PETROLOGY VOLUME 36 Potassic-rich |  | | Journal (article/letter/editorial) | | Lueshe (Zaire) and bariopyrochlore from Minas Gerais (Brazil), which are excellent examples of secondary...Mitchell, R.H. (2002) New data on pyrochlore- and perovskite-group minerals from the Lovozero alkaline complex...pyrochloregroup minerals from the Lueshe and Araxá (Barreiro) carbonatites by 57Fe Mössbauer spectroscopy |  | 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) | | the crystallization of pyrochlores rather than perovskite-group minerals (Jago and Gittins, 1991, 1993;...2000) and the Catalão II carbonatitic deposit in Brazil (Rocha et al., 2001). In all these cases the A-site...Paraguay: a comparison with coeval carbonatites from Brazil and Angola. Pp. 231248 in: Alkaline magmatism...Paraguay; relationships with coeval magmatism in Brazil (P. CominChiaramonti and C.B. de Barros Gomes,...Editora da Universidade de São Paulo, São Paulo, Brazil, 464 pp. Chakhmouradian, A.R. and Mitchell, R.H |  | Walter, B.F., Parsapoor, A., Braunger, S., Marks, M.A.W., Wenzel, T., Martin, M., Markl, G. (2018) Pyrochlore as a monitor for magmatic and hydrothermal processes in carbonatites from the Kaiserstuhl volcanic complex (SW Germany) Chemical Geology, 498. 1-16 doi:10.1016/j.chemgeo.2018.08.008 | Journal (article/letter/editorial) | | in carbonatites are pyrochlore-group minerals, perovskite and minerals, baddeleyite (ZrO2), zirconolite...(Mitchell, 2015). Three mines are in operation today: Araxá and Cataláo-II (Brasil) and St. Honoré (Canada)...sphalerite, chalcopyrite), barite and rare Nb-perovskite (only in some Badberg samples). The modal amount... apatite, pyrochlore (mostly unzoned) and Nb-perovskite. In some cases, calcite ocelli, phlogopite, rare...accessory clinopyroxene, garnet, apatite, Nb-perovskite, and pyrochlore-group minerals. A carbonatite |  | 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 |  | Barreiro, J. Gómez, Lonardelli, I., Wenk, H.R., Dresen, G., Rybacki, E., Ren, Y., Tomé, C.N. (2007) Preferred orientation of anorthite deformed experimentally in Newtonian creep. Earth and Planetary Science Letters, 264 (1) 188-207 doi:10.1016/j.epsl.2007.09.018 | Journal (article/letter/editorial) | | deformed experimentally in Newtonian creep J. Gómez Barreiro a,⁎, I. Lonardelli a,b , H.R. Wenk a , G. Dresen...address: jgomezbarreiro@berkeley.edu (J. Gómez Barreiro). 0012-821X/$ - see front matter © 2007 Elsevier...“crystallographic preferred orientation”. J. Gómez Barreiro et al. / Earth and Planetary Science Letters 264...olivine (Fliervoet et al., 1999) and fine-grained perovskite (Karato et al., 1995). Since a Newtonian (linear)...apparatus equipped with an internal 190 J. Gómez Barreiro et al. / Earth and Planetary Science Letters 264 |  | | Book (edition) | | International Symposium on Carbonatites in Pocos de Caldas, Brazil for which this writer was keynote speaker. The... Pakistan, Quebec, Finland, Guyana, Venezuela, Brazil, Paraguay, Angola and South-West Africa, i.a. Carbonatites...Quebec and Araxa, Brazil) and important sources of P, Ti, Cu and CaCO; (Jacupiranga, Brazil). In addition...Carbonatites of the World United States Canada Brazil Greenland, Europe, and the U.S.S.R. Africa India...Algoma-Sudbury districts of Ontario (Parsons, 1961). For Brazil few detailed reports are available, but summaries |  | | Journal (article/letter/editorial) | | online 18 April 2009 Keywords: Pyrochlore Betafite Perovskite Kimberlite Carbonatite Venezuela a b s t r a...OH)−. The zoning patterns and the absence of perovskite indicate the dominant role of F among fluid components...concentrators of Nb, Zr, Ta, Th, U and possibly REE. No perovskite, rutile, zircon or other Zr-bearing minerals...pyrochlore-group mineral is stabilised in preference to perovskite, Fig. 8. Relations between the 2(Ti,Zr) + 2(Th...issue). To answer this, the relationships between perovskite-group and pyrochlore-group minerals in carbonatites |  | | Journal (article/letter/editorial) | | Cooper 1971). More recently, U–Pb and Rb–Sr ages (Barreiro & Cooper 1987, Cooper et al. 1987) and K–Ar studies...Institution of Washington, using techniques outlined by Barreiro & Cooper (1987). Mineral Chemistry Representative...in patterns of magnesian carbonatite at Juquia, Brazil (Beccaluva et al. 1992). The low LREE contents...Sr–Nd–Pb isotope ratios have been determined by Barreiro & Cooper (1987). Dykes from the Haast River segment...against a mantle plume origin (Hoernle et al. 2006). Barreiro & Cooper (1987) noted the similarity of isotopic |  | | Journal (article/letter/editorial) | | on the East Pacific Rise: a submersible study Barreiro, B.A. and Clark, A.H., Lead isotopic evidence...D.A., see Roden, M.F. et al. Clark, A.H., see Barreiro, B.A. and Clark, A.H. Converse, D.R., Holland...Jones, A.P. and Wyllie, P.J., Minor elements in perovskite from kimberlites and distribution of the rare |  | | Journal (article/letter/editorial) | | Carbonatite complex 1 2 3 Amba Dongar Otjisazu Araxá Total (km2) 6.7 11.9 21.2 km2 3.2 0.9 7.0 % 47...Paleoproterozoic collision zone of the Borborema province, NE Brazil (EJ dos Santos et al. 2013; RV Santos et al. 2013);...presence of blue– green Na- and K- amphiboles, perovskite, pyrochlore, Figure 16. Folds within dolomite...Mount Weld, Australia (Lottermoser 1990) and Araxá, Brazil (Neumann and Medeiros 2015). The REE mineralisation...Nb (Figures 21(c, d) and 23 (a); e.g. Catalão, Brazil; Lueshe, Democratic Republic of Congo; and St. | | | Report (issue) | | Paulista phosphate deposit in Pernambuco State, Brazil, in Notholt, A.J.G., Sheldon, R.P., and Davidson...adjacente incluindo depósitos minerais: Brasilia, Brazil, Departamento Nacional da Producao Mineral, p....1989a, The Jacupiranga apatite deposit, Sao Paulo, Brazil, in Notholt, A.J.G., Sheldon, R.P., and Davidson...1989b, The Ipanema phosphate deposit, Sao Paulo, Brazil, in Notholt, A.J.G., Sheldon, R.P., and Davidson...Nielsen, T.F.D., 1997, Rare earth chemistry of perovskite group minerals from the Gardiner Complex, East |  | | Journal (article/letter/editorial) | | reported for 13 carbonatites from Africa, Australia, Brazil, Europe and the United States. The carbonatites...with variable fractionation of sphene, apatite, perovskite, monazite or zircon. The samples range in age...1974; BASU and TATSUMOTO, 1980; BELL et al., 1982; BARREIRO, 1983; RODEN et al., 1985; GR~NENFELDERet al....Canadian continental crust since the late Archaean. BARREIRO(1983) also proposed a similar model for carbonatites...schists and granodiorite of southwest Sb Paulo, Brazil. The age of intrusion is well constrained by both |  | | Journal (article/letter/editorial) | | and other materials under extreme pressures. Perovskite-structured minerals, which dominate Earth’s mantle...developed for nanotechnology applications (Lazzeri and Barreiro 2014). E LEMENTS Incorporating nitrogen within...LEMENTS Grätzel M (2014) The light and shade of perovskite solar cells. Nature Materials 13: 838-842 Hellmann...Chemistry of Materials 25: 503-508 Lazzeri M, Barreiro A (2014) Carbonbased nanoscience. Elements 10: |  | | Book | | SERRA DA CAPIVARA Andrea Bartorelli 16c - CAMPOS GERAIS DO PARANÁ Mário Sérgio de Melo, Gilson Burigo Guimarães...investigados porque sua atuação se deu sob leis gerais idênticas às que vigoram hoje. O Princípio do Uniformitarismo...de um divulgador em Ciência apontar os “traços gerais” e os “princípios instigantes” da natureza por...seus pormenores, e deles extrair algumas linhas gerais. Convidamos o leitor a apreciar esse conjunto de...oferecem classificações variadas, mas, em linhas gerais, existe certa congruência na grande maioria delas |
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