 | | 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 |  | | 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...general order of abundance, quartz, fluorite, strontianite, barite, and hematite. Ancylite is an indicator...hydrothermal processes; it is found intergrown with strontianite in altered carbonatites (Mariano, 1989). The...20° 10° 0° 10° 20° 30° 40° 50° 60° 80° Araxá Buena Norte mining district Zandkopsdrift Lofdal |  | 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 hydrothermal veins; fluorite, baryte and strontianite are common in some of the veins (Fig. 6a,b)...consist of euhedral crystals of dolomite, quartz, strontianite and fluorite which do not exceed a few millimetres...intergrown with quartz and dolomite or ankerite. Strontianite tends to be euhedral and occurs as pseudohexagonal...in some hydrothermal veins, where it replaces strontianite (Fig. 6c). Niobium-rich rutile (Nb2O5 in the...infilling. (a) Vein infilled with dolomite (Dol) and strontianite (Str) cutting a carbonatite (righthand side |  | 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) | | Sr-, Ba- and Pb-pyrochlores include hematite, strontianite, barite and REE-fluocarbonates and phosphates...economic point of view: the Seis Lagos deposit in Brazil, the largest Nb deposit in the world, has reserves...(Ap2) veined by calcite (Cal2), barite (Brt) and strontianite (Srt) in dolomitized carbonatite. b) Pyrochlore-II...sequence including kutnohorite (Kut), followed by strontianite (Str), barite (Brt), rhabdophane-(La) (Rbd)...193 Fig. 5. (continued). infilling consist of strontianite (SrCO3), barite (BaSO4), bastnäsite-(La) [LaCO3F] |  | | 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...calcite, dolomite, norsethite (Cooper 1971), strontianite, daqingshanite(Ce) (Cooper 1986), a Ba–REE–Na...Institution of Washington, using techniques outlined by Barreiro & Cooper (1987). Mineral Chemistry Representative...wt% SrO) occurring in grains coexisting with strontianite. Barium contents are generally below detection...SrO, except for those phases coexisting with strontianite, where SrO contents reach 1.83%. Concentrations |  | 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) | | REE2O3, comprise assemblages of monazite-(Ce), strontianite and baryte forming hexagonal pseudomorphs after...fluids. Carbon and oxygen isotope ratios of strontianite, representing the REE mineral assemblage, indicate...et al. 1998, 2002, 2015); Barra do Itapirapuã, Brazil (Andrade et al. 1999; Ruberti et al. 2008); and...or monazite, commonly in an assemblage with strontianite and baryte. Partial replacement of burbankite...rock components. For this, we have analysed strontianite, which occurs as part of the REE pseudomorph |  | | Journal (article/letter/editorial) | | Keyworth Nottingham, NG12 5GG UK. F. Wall B.A. Barreiro B. Spire Introduction Methodology and analytical...ferrocarbonatites which host major monazite(Ce)-strontianite-baryte mineralization. A similar assemblage...dolomiteL~ B B Dark'c~176 olomite ~-3 m 1 ~ -4 [ Strontianite 1 O. s A••fi•d d" / -7 -8 Formation of...carbonatite-derived fluid as the intrusion cooled. Again the strontianite was unaffected and the REE mineralization is...that of the carbonate in the REE-rich rocks. Strontianite, representative of the REE mineralization, has |  | | Journal (article/letter/editorial) | | intrusion of mantle-derived lamprophyric magmas (Barreiro and Cooper, 1987) is thought to relate to tensional...loMgo.44Cao.96 (CO3)2)-titanian aegirine-calcian strontianite (Srl.23Cao.73Bao.o4(CO3)2)-Ba Ca Sr L R E E...late-crystallizing phase associated with calcian strontianite and a BaCa-Sr L R E E carbonate (possibly burbankite)...apatite. Contrib. Mineral. Petrol., 93, 491-503. Barreiro, B.A. and Cooper, A.F. (1987) A Sr, Nd, and Pb...Roy. Soc. New Zealand, 23, 313-36. Cooper, A.F., Barreiro, B.A., Kimbrough, D.L. and Mattinson, J.M. (1987) |  | 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 |  | | 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 (issue) | | geology, and notable localities of diamond mining in Brazil, and outlines plans for future diamond production... Svisero, James E. Shigley, and Robert Weldon Brazil, which commanded global production in the 1700s...principally in the states of Minas Gerais and Mato Grosso, are presented. W hile Brazil is widely known for...Tijuco (later named Diamantina) in the state of Minas Gerais (Calógeras, 1904; Leonardos, 1959; Barbosa,...and Bartorelli, 2010). For the next 150 years, Minas Gerais was the world’s major supplier of gem diamonds |  | | Journal (article/letter/editorial) | | Subbotin et al., 1999) and Barra do Itapirapuã, Brazil (Andrade et al., 1999). With the exception of Mountain...(1) ancylite-(Ce) + strontianite + baryte and (2) synchysite-(Ce) + strontianite + baryte (Zaitsev et...minerals Ancylite – (Ce) + strontianite + baryte; Synchysite – (Ce) + strontianite + baryte Carbocernaite...5 – 1.1 REE2O3 = 43.0 – 47.6 F = 1.0 – 2.5 Strontianite SrO = 61.8 – 68.8 CaO = 1.2 – 6.1 BaO = 0.4...(mixtures of ancylite – (Ce), strontianite and baryte; synchysite – (Ce), strontianite and baryte; carbocernaite |  | Broom-Fendley, Sam, Brady, Aoife E., Horstwood, Matthew S.A., Woolley, Alan R., Mtegha, James, Wall, Frances, Dawes, Will, Gunn, Gus (2017) Geology, geochemistry and geochronology of the Songwe Hill carbonatite, Malawi. Journal of African Earth Sciences, 134. 10-23 doi:10.1016/j.jafrearsci.2017.05.020 | Journal (article/letter/editorial) | | euhedral synchysite-(Ce), baryte, and anhedral strontianite are disseminated throughout the carbonatite...parisite-(Ce), euhedral baryte and anhedral strontianite or calcite (Fig. 4D). Cross-cutting relationships...partially fragmented apatite in a matrix of strontianite and fluorcarbonates (Fig. 4E). 3.4. Late-stage...carbonatite; (C) vugs of synchysite, baryte and strontianite in C2 calcite carbonatites; (D) truncation of...partially fragmented apatite in a matrix of strontianite and fluorcarbonates in C3 carbonatites; and, |  | | 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...of Catalao I ultramafic alkaline complex, Goias, Brazil, in Notholt, A.J.G., Sheldon, R.P., and Davidson |  | | Journal (article/letter/editorial) | | khanneshite, nyerereite, shortite, bradleyite, strontianite, britholite-(Ce) and barite. Three mineral parageneses...khanneshite, nyéréréite, shortite, bradleyite, strontianite, britholite-(Ce) et barite. Nous distinguons...The crystals of type (i) are associated with strontianite and barite, and those of type (ii), with cerite-(Ce)...versus SrO, and (b) CaO + SrO versus REE2O3. Strontianite This is a rare mineral in CAPR, occurring intergrown...6 wt.% BaO), typical substituent elements in strontianite from carbonatites (Kapustin 1980, Bulakh et |  | 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) | | ankerite, siderite, norsethite, daqinshanite, strontianite, a Sr–Ca phase, a burbankite-like Ba–REE–Na...Sr/86Sr ratios reported for the Alpine Dyke Swarm (Barreiro and Cooper, 1987). 15 samples of carbonatites...to represent interaction with the host schist (Barreiro and Cooper, 1987). In contrast to these low isotope...Contributions to Mineralogy and Petrology 88, 233–245. Barreiro, B.A., Cooper, A.F., 1987. A Sr, Nd, and Pb isotope...Canadian Mineralogist 46, 753–777. Cooper, A.F., Barreiro, B.A., Kimbrough, D.L., Mattinson, J.M., 1987 | | | Report (issue) | | apatite, fluorapatite monazite, bastnäsite quartz strontianite, celestite tantalite thorite, monazite ilmenite...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 |  | | 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 |  | | Journal (article/letter/editorial) | | Stokesite Stolzite Strelkinite Stromeyerite Strontianite Strüverite Suanite Sugilite Sulfur native Svanbergite...gold-bearing quartz veins in the southern Para State, Brazil (Angelica et al., 1997). Chromium muscovite named...conglomerate-hosted U deposits of the Randtype at Jacobina, Brazil (pers. com. P. Laznicka). Chromium-bearing garnet...Canada, Dore Lake, Australia, Campo Formoso, Bahia-Brazil) (Barnes and Francis, 1995; Leinonen, 1998; Kojonen...ultrabasic rocks such as in the Bacuri Complex-Amapa, Brazil (Spier and Filho, 2001). Further sites are found | | | Journal (article/letter/editorial) | | Stokesite Stolzite Strelkinite Stromeyerite Strontianite Strüverite Suanite Sugilite Sulfur native Svanbergite...gold-bearing quartz veins in the southern Para State, Brazil (Angelica et al., 1997). Chromium muscovite named...conglomerate-hosted U deposits of the Randtype at Jacobina, Brazil (pers. com. P. Laznicka). Chromium-bearing garnet...Canada, Dore Lake, Australia, Campo Formoso, Bahia-Brazil) (Barnes and Francis, 1995; Leinonen, 1998; Kojonen...ultrabasic rocks such as in the Bacuri Complex-Amapa, Brazil (Spier and Filho, 2001). Further sites are found |  | | Journal (article/letter/editorial) | | indices (SI) of aragonite, calcite, barite and strontianite. Partial pressure of CO2 is given in the last...(aragonite) SI (calcite) SI (barite) SI (strontianite) Log pCO2 Uncia Catavi Llallugua Caleras Chaqui...of active Andean volcanism. In: Harmon, R.S., Barreiro, B.A. (Eds.), Andean Magmatism: Chemical and Isotope |  | | Book | | . . . . . . . . . . . . . . . . . . . . . . . Brazil . . . . . . . . . . . . . . . . . . . . . . . ......... . ..... . ........ . ................ . Brazil ...... . .... .... ............... .. ....... ...southern Norway; northern Karelia, U.S.S.R.; Brazil, in Minas Gerais at Brejauba and Engenho Central, in Paraiba...Finland, and Alto do Giz, Rio Grande do Norte, Brazil), on tantalite (Main Tantalite Dike, Strelley,...related type of occurrence is at Barreiro, Araxa, Nlinas Gerais, Brazil, in a calcite vein cutting an alkalic |  | | Journal (article/letter/editorial) | | 1172 ABSTRACTS (Carboniferous) of Southern Brazil. It was traced across the diamond region of Goias...diamantiferous glacial horizons in Minas Gerais and Bahia with those in the rest of Brazil. The facieologic unity...classification. DEVONIAN SYSTEM IN GOIAS AND MATO GROSSO, BRAZIL KENNETH E. CASTER Universities of Cincinnati and...co-operation with the Divisao de Geologia e Mineralogia of Brazil, more than doubles its area and makes stratigraphicpaleontologic...Cincinnati, Cincinnati, Ohio; University of Sao Paulo, Brazil A Portuguese translation of Du Toil's 1927 Geological |  | | Report (issue) | | rare-earth elements, and antimony in China; niobium in Brazil; and platinum-group elements in South Africa and...chart showing niobium resources and reserves in Brazil, Canada, and the United States...................industrialization in large developing countries, such as Brazil, China, and India. In addition, the development...cobalt (Democratic Republic of the Congo), niobium (Brazil), and platinum (South Africa), are also considered...Zhayrem (Gauert, 2001). 80° Neuquen-Mendoza Araxá Camamu 0° Jameson Land basin Jbel Irhoud 45° |
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