| | 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 | | 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) | 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) | 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);...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....regolith (e.g. Catalão I, Brazil; Cordeiro et al. 2011; and Araxá, Brazil; Issa Filho et al. 2015). Although | | | Journal (article/letter/editorial) | inclusions have been described in perovskite and calzirtite from calcite carbonatite of the Guli complex...those from Kovdor or Gardiner. Perovskite and calzirtite from Guli contain inclusions of carbonate phases...The successive precipitation of baddeleyite, calzirtite and zirconolite also indicates a steady increase...Na-rich carbonate inclusions in perovskite and calzirtite from the Guli intrusive Cacarbonatite, Polar...Quebec. Can. Mineral. 10, 511-540. WALL, F., BARREIRO, B.A. & SPIRO, B. (1994): Isotopic evidence for | | | Journal (article/letter/editorial) | and alkaline rocks, whereas other Zr-minerals (calzirtite, zirconolite, zirkelite) may crystallize earlier...pyrochlore-group minerals from the Lueshe and Araxá (Barreiro) carbonatites by 57Fe Mössbauer spectroscopy | | Nikolenko, Anna M., Redina, Anna A., Doroshkevich, Anna G., Prokopyev, Ilya R., Ragozin, Alexey L., Vladykin, Nikolay V. (2018) The origin of magnetite-apatite rocks of Mushgai-Khudag Complex, South Mongolia: mineral chemistry and studies of melt and fluid inclusions. Lithos, 320. 567-582 doi:10.1016/j.lithos.2018.08.030 | Journal (article/letter/editorial) | Harmer, 2000; Russell et al., 1954), in Araxa, Brazil (Gittins, 1966; Issa Filho et al., 1984) and others...geology of the Barreiro carbonatitic complex, Araxá, MG, Brazil. Carbonatitic complexes of Brazil: geology...Na-rich carbonate inclusions in perovskite and calzirtite from the Guli intrusive Ca-carbonatite, polar | | | 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 | | | Book | BARTORELLI ::• . . .. MINERALS & PRECIOUS STONES OF BRAZIL Sponsored by: VALE MINISTER.IO DA CULTURA ©...Lavra do Sapo, Ferruginha, Conselheiro Pena, Minas Gerais. Collection of Alvaro Lucio. Photograph taken...Brasileira do Livro, SP, Brazil) Cornejo, Carlos .Minerals & precious stones of Brazil. Carlos Cornejo, Andrea...3. Minerals - Brazil 4. Minerals- Classification 5. Mineralogy 6. Mineralogy - Brazil - History 7. Precious...Precious stones - Brazil I. Bartorelli, Andrea. II. Title. 09-10025 Cover photograph: Crystal of brazilianite | | | Book | crandallite from the Alto Benedeto pegmatite, Parai'ba, Brazil (by J.P. Cassedanne & L. Barreto) 22: 183-185 ALTO...Burian goyazite from [Alto Bernardino, Paraiba,] Brazil (by J. S. White, Jr.) 12:379 ALUMOHYDROCALCITE...and muscovite from the Ze Pinto prospect, Minas Gerais, Brazil 21:405-408 --with J.P. Cassedanne: Crystallized...Pitora, Minas Gerais, Brazil 21:409-412 --with J. P. Cassedanne: The Jaguara~u pegmatite, Minas Gerais, Brazil...and platinum from C6rrego Born Sucesso, Minas Gerais, Brazil 23:471-474 AMARGOSA DESERT Hydroboracite | | | Book | deposited in the sedimentary basin of Curitiba, Brazil (Cesbron et al. 1979) is still problematical considering...REE patterns of lanthanide-(Nd) frorn Curitiba, Brazil (a) and lanthanide-(Ce) frorn Britannia Mine, UK...identified from only a single oeeurrenee at Alto do Giz, Brazil, where it forms as a replaeement produet ofmierolite...established its presence in the Alto do Giz pegmatite in Brazil. So far, alumotantite shows only limited Substitution...wolframite structure are so far unknown. 5.5 Calzirtite This tetragonal mineral is essentially an oxide | | | Journal (volume) | Myanmar Emeralds from the Piteiras mine, Minas Gerais State, Brazil: genetic implications from fluid inclusion...Piteiras mine in Itabira is located in the Minas Gerais State, Brazil and produces gem quality emeralds. Ultramafic...property. “Gem-quality” alexandrite specimens from Brazil, India, Madagascar, Russia, Sri Lanka, and Tanzania...sources. Alexandrite samples from the Hematita mines (Brazil) have typically high Sn (up to 2294 ppm) concentrations...showing LA-ICP-MS data [ppm] for alexandrites from Brazil (BZ), Madagascar (MAD), Russia, Sri Lanka, and |
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