 | | 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 |  | 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) | | Lueshe (Zaire) and bariopyrochlore from Minas Gerais (Brazil), which are excellent examples of secondary...and zirkelite: comparison with pyrochlore and zirconolite. American Mineralogist, 68, 262–276. Möller,...pyrochloregroup minerals from the Lueshe and Araxá (Barreiro) carbonatites by 57Fe Mössbauer spectroscopy |  | | Journal (article/letter/editorial) | | In some classifications the cesstibtantite and zirconolite subgroups are considered to belong to the pyrochlore...submicron-sized inclusions of any Zr-rich phases (zircon, zirconolite, baddeleyite, etc.) are found within the zoned... such Zr-rich compositions resemble niobian zirconolite and zirkelite from the Kola carbonatitic rocks...rutile, zircon or other Zr-bearing minerals (zirconolite, baddeleyite, khibinskite, etc.) are found, although...rocks, whereas other Zr-minerals (calzirtite, zirconolite, zirkelite) may crystallize earlier, later or |  | 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) | | perovskite and minerals, baddeleyite (ZrO2), zirconolite (CaZrTi2O7), calzirite (Ca(Zr,Ca)2Zr4(Ti,Fe)2O16)...(Mitchell, 2015). Three mines are in operation today: Araxá and Cataláo-II (Brasil) and St. Honoré (Canada)... magnetite, amphibole, forsteritic olivine, zirconolite, calzirite and baddeleyite. Rare medium-to fine-grained...of the Barreiro carbonatitic complex, SC Araxá, MG, Brazil. Carbonatitic complexes of Brazil: geology: |  | 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...fenites and other alkali metasomatic rocks) Zirconolite, pyrochlore 1.6 Mt at 0.53% Nb2O5, 0.017% Ta2O5;...Johnson/ Pawnee Co's, Nebraska, USA Barreiro, Araxá, Minas Gerais, Brazil Boa Vista and other projects, Catalão |  | Atencio, D., Andrade, M. B., Christy, A. G., Giere, R., Kartashov, P. M. (2010) The pyrochlore supergroup of minerals: nomenclature. The Canadian Mineralogist, 48 (3) 673-698 doi:10.3749/canmin.48.3.673 | Journal (article/letter/editorial) | | Paulo, Rua do Lago, 562, 05508-080, São Paulo, SP, Brazil Marcelo B. ANDRADE Instituto de Física de São...Universidade de São Paulo, 13560–970, São Carlos, SP, Brazil Andrew G. CHRISTY Research School of Earth Sciences...Mineralogy of Brazil (first ed.). Museu de Geociências, Universidade de São Paulo, São Paulo, Brazil. Baldwin...in the Borborema Pegmatitic Province, northeast Brazil. Anais da Academia Brasileira de Ciências 77, 169-182...and zirkelite: comparison with pyrochlore and zirconolite. American Mineralogist 68, 262-276. Kovalenko |  | | Journal (article/letter/editorial) | | lower amphibolite-facies conditions (Smith and Barreiro 1990; Catlos et al. 2002). However, monazite may...facies metamorphism (Overstreet 1967; Smith and Barreiro 1990). However, some studies have suggested that...silicate minerals, including staurolite (Smith and Barreiro 1990; Kingsbury et al. 1993; Kohn and Malloy 2004)...27:1431–1450 Rasmussen B, Fletcher IR (2004) Zirconolite: a new U–Pb chronometer for mafic igneous rocks...systems in monazite. Chem Geol 191:165–181 Smith HA, Barreiro B (1990) Monazite U–Pb dating of staurolite grade |  | | Journal (article/letter/editorial) | | monazite under metamorphic conditions, Smith and Barreiro, 1990; Kingsbury et al., 1993; Bingen et al.,...once the greenschist facies is passed (Smith and Barreiro, 1990; Kingsbury et al., 1993; Ohr et al., 1994;...determined the solubility of zircon crystals from Brazil and Madagascar using a variety of analytical methods...(Hayward, 1988), pyrochlore (Ca, REE[Ti2O7]), zirconolite (CaZrTi2O7), apatite (Ca4 XREE6 + X[SiO4]6...foreland basin in Quadrilátero Ferrı́fero, southeast Brazil. Earth Planet. Sci. Lett. 141, 259 – 276. Martin |  | | Journal (article/letter/editorial) | | corresponding with the staurolite isograd (Smith and Barreiro, 1990; Kingsbury et al., 1993). Its formation...particularly allanite (Overstreet, 1967; Smith and Barreiro, 1990; Ferry, 2000; Wing et al., 2003), though...338–351. Rasmussen, B., Fletcher, I.R., 2004. Zirconolite: a new U–Pb chronometer for mafic igneous rocks...East Antarctica. AGSO Bull., 244. Smith, H.A., Barreiro, B., 1990. Monazite U-Pb dating of staurolite |  | | 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 |  | Tang, Xu, Li, Qiu-Li, Zhang, Bin, Wang, Peng, Gu, Li-Xin, Ling, Xiao-Xiao, Fei, Chen-Hui, Li, Jin-Hua (2020) The Chemical State and Occupancy of Radiogenic Pb, and Crystallinity of RW-1 Monazite Revealed by XPS and TEM. Minerals, 10 (6) 504 doi:10.3390/min10060504 | Journal (article/letter/editorial) | | Lett. 1986, 77, 35–48. [CrossRef] Smith, H.A.; Barreiro, B. Monazite U-Pb dating of staurolite grade metamorphism...Swelling induced by alpha decay in monazite and zirconolite ceramics: A XRD and TEM comparative study. J |  | | Journal (article/letter/editorial) | | precipitation of baddeleyite, calzirtite and zirconolite also indicates a steady increase in a(Ca2+) (Chakhmouradian...Quebec. Can. Mineral. 10, 511-540. WALL, F., BARREIRO, B.A. & SPIRO, B. (1994): Isotopic evidence for |  | Smye, Andrew J., Roberts, Nick M.W., Condon, Daniel J., Horstwood, Matthew S.A., Parrish, Randall R. (2014) Characterising the U–Th–Pb systematics of allanite by ID and LA-ICPMS: Implications for geochronology. Geochimica et Cosmochimica Acta, 135. 1-28 doi:10.1016/j.gca.2014.03.021 | Journal (article/letter/editorial) | | primarily found in metapelitic rocks (Smith and Barreiro, 1990; Wing et al., 2003), but is also present...constrain accessory phase relationships (Smith and Barreiro, 1990; Kingsbury et al., 1993; Wing et al., 2003;...melts. Elements 3(1), 43–50. Gieré R. (1986) Zirconolite, allanite and hoegbomite in a marble skarn from...microanalysis. Chem. Geol. 249(1), 1–35. Smith H. A. and Barreiro B. (1990) Monazite U–Pb dating of staurolite grade |  | | 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...family of pyrochlore-microlite-betafite minerals. Zirconolite and niobzirconolite are identical with zirkelite |  | | Report (volume) | | Honeyman 1989). Smellie I 994), Poyos de Caldas in Brazil (Chapman et al. 1990) and the Oklo natural reactors...Mascarenhas YP 1991 Phurcalite from Perus, Sao Paulo, Brazil, and redetermination of its crystal structure....Ewing 1993). The structures of pyrochlore and zirconolite share some basic features with those of fergusonite...of the CaF2 structure (Chakoumakos 1984) and zirconolite is a derivative of the pyrochlore structure (Mazzi...M02 ABO, AB206 Pyrochlore Ar.2B206(0,0H,F) Zirconolite AA'B20, distorted cube distorted cube X X |  | | 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 |  | | Report (volume) | | face of apatite from the Golconda Mine, Minas Gerais Brazil. The three vicinal faces of the hillock exhibit...reported on the {100} faces of apatites from Minas Gerais, Brazil (Rakovan and Reeder 1994). The formation...of a fluorapatite from the Golconda Mine, Minas Gerais, Brazil. Image is ~666 μm vertical. [Modified after...of a fluorapatite from the Golconda Mine, Minas Gerais, Brazil. Image is ~1 mm across. [Used by permission...United States, Australia, South Africa, Sri Lanka, Brazil, India, Malagasy, and Canada. As shown in Table |  | Kogel, Jessica Elzea, Trivedi, Nikhil C., Barker, James M., Krukowski, Stanley T. - Eds. (2006) Industrial Minerals and Rocks (7th ed.) Society for Mining, Metallurgy, and Exploration, Inc., Littleton, CO. | Book (edition) | | concentrat ed in southern Africa, the Siberian Platform, Brazil, and Western Australia. Ages range from Precambrian...associated with pegmatites in locations such as Brazil, the former U.S.S.R., and western Canada, pro duction...Venezuela, Guyana, Surinam, Guiana, and parts of Brazil and Colombia) • Northern Brazilian Shield Province...coming from Australia, Guinea, Jamaica, China, and Brazil. Nonmetallurgical grades used for refractories...specific deposits in China, Australia, Guinea, Brazil, Guyana, and Suriname. Fluorspar Manganese Lithium |  | | Report (issue) | | R., Fitton, J.G., George, R., Smith, R., and Barreiro, B., 2000, Two mantle plumes beneath the East... R., Fitton, J.G., George, R., Smith, M., and Barreiro, B., 2000, Two mantle plumes beneath East African... R., Fitton, J.G., George, R., Smith, M., and Barreiro, B., 2000, Two mantle plumes beneath the East... R., Fitton, J.G., George, R., Smith, M., and Barreiro, B., 2000, Two mantle plume beneath East African...São Paulo, Rua do Lago 562, 05508-080 São Paulo, Brazil ABSTRACT Post-Paleozoic magmatism in Angola and |  | | Book | | of about 2000), with production being moved to Brazil. The remainder of southern and central England...calcium cataplciite, nuorapatitc, monazite and zirconolite (Preston et al. 1998a, 2000a,b). MINERAL A...found on St Kilda (Hirta), Western Isles, with zirconolite (zirkclitc) in a granitic vein on Abhainn Mhor...lsles, the other species being allanite and zirconolite (zirkelite). Chevkinite is found in the Conachair...in grnnodioritc from the Mountsorrcl area (e.g. Brazil Wood, 153 Blackclinosafflorite encrustingdendritesof |  | | Report (volume) | | origin of colour and pleochroism in andalusite from Brazil. Can Mineral 10:47-56 Faye GH, Nickel EH (1971)...Borborema Province, and Rio Grande do Norte State, NE Brazil (Galindo et al. 1995; Sial et al. 1999a,b; Campos...from Serra Negra do Norte Pluton, northeastern Brazil. Chem Erde-Geochem 60:279-303 Cerredo ME, De Luchi...Umarizal-Caraubas region, Rio-Grande-Do-Norte, northeast Brazil. J S Am Earth Sci 8: 79-95 Gieré R, Sorensen SS...diverse magmatic epidote-bearing granitoid rocks in Brazil, Argentina and Chile. Lithos 46:367-392 Sial AN |  | | Report (volume) | | magmatism (Atherton and Tarney, 1979; Harmon and Barreiro, 1984; Pitcher et al., 1985) also see Hildreth's...Amer. Mineral. 71, 1297-1313. Harmon, R.S. and Barreiro, B.A. (1984) Andean Magmatism, Chemical and Isotopic...J. Met. Geol. 4, 285-308. Gieré, Reto (1986) Zirconolite, allanite and hoegbomite in a marble skarn from |
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