| | 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 | | | 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 | | 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 | | 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 | | 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 | | Coelho, Mariana Barroso, Trouw, Rudolph Allard Johannes, Ganade, Carlos E., Vinagre, Rodrigo, Mendes, Júlio Cezar, Sato, Kei (2017) Constraining timing and P-T conditions of continental collision and late overprinting in the Southern Brasília Orogen (SE-Brazil): U-Pb zircon ages and geothermobarometry of the Andrelândia Nappe System. Precambrian Research, 292. 194-215 doi:10.1016/j.precamres.2017.02.001 | Journal (article/letter/editorial) | overprinting in the Southern Brasília Orogen (SE-Brazil): U-Pb zircon ages and geothermobarometry of the...overprinting in the Southern Brasília Orogen (SE-Brazil): U-Pb zircon ages and geothermobarometry of the...overprinting in the Southern Brasília Orogen (SE-Brazil): U-Pb zircon ages and geothermobarometry of the...Rio de Janeiro, Brazil 2. Serviço Geológico do Brasil – SBG/CPRM, Rio de Janeiro, Brazil 3. Universidade...Universidade de São Paulo – USP, São Paulo, Brazil ABSTRACT The Andrelândia Nappe System (ANS) is an important | | | Report (issue) | xenotime-monazite accumulations in mafic gneiss, (f) ion-absorption clay deposits, and (g) monazite-xenotimebearing...the world’s primary source of the heavy REEs. Monazite-bearing placer deposits were important sources...led by, in decreasing order of reserves, China, Brazil, Australia, and India (Gambogi, 2015). Australia...contain significant quantities of REEs; however, monazite has not been produced from heavy-mineral sands...primarily owing to the presence of thorium in monazite. Lynas Corporation Ltd. of Australia began production | | | 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 | | | Journal (article/letter/editorial) | foreland basin in Quadrilitero Ferrifero, southeast Brazil N. Machado a** , A. Schrank b, C.M. Note ‘, G....13081-970 Campinas. SP Brazil ’ Instituto de Geocitncias, UniLaersidadeFederal de Minas Gerais, 31270-901 Belo...Belo Horizonte, Brazil d Dipartement de Giologie, lJniGersit&de Mont&al. CP6820 Montreal, Qc H3C 357 Canada...greenstone belt, emplaced at 2772-2780 Ma; and the Minas SupergroupItacolomi Group Paleoproterozoic sedimentary...2.85 Ga; (2) the lower detrital sequence of the Minas Supergroup was supplied with sediments derived from | | | Journal (article/letter/editorial) | tropicaland•equatorialcountriessuch as Australia,BelgianCongo,Brazil, India, and Nigeria, whereweatheringis rapid and...pyrochloreor microlite are associatedwith magnetite, monazite,rutile and other mineralsin the black sands. The...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...radioactiveelementsare in accessory mineralssuchas pyrochlore, monazite,thorite, uranothorianite,zircon and apatite that | | Marimon, Rodrigo S., Trouw, Rudolph A.J., Dantas, Elton L., Ribeiro, André, Santos, Priscila, Kuster, Klaus, Vinagre, Rodrigo (2021) Provenance of passive-margin and syn-collisional units: Implications for the geodynamic evolution of the Southern Brasília Orogen, West Gondwana. Sedimentary Geology, 413. 105823pp. doi:10.1016/j.sedgeo.2020.105823 | Journal (article/letter/editorial) | RJ, Brazil of c Universidade de Brasília, Instituto de Geociências, Brasília, DF, Brazil Mineral...setting. Two metamorphic ages were obtained by U-Pb monazite dating at ~633 and 606 Ma, indicating that protracted... from the Brasília Orogen, such as part of the Araxá Group (e.g., Piuzana et al., 2003) and Jo the...similarity (Pereira et al., 1994). Some samples of the Araxá Group also show similar U-Pb age patterns to those...common collisional setting. The obtained (U-Pb monazite) metamorphic ages: ~633 and 606 Ma indicate that | | | Report (issue) | and Ore Deposits of the Alegria District, Minas Gerais, Brazil GEOLOGICAL SURVEY PROFESSIONAL PAPER 341-J...the Departamento National da Producao Mineral of Brazil under the auspices of the Agency for International...District, Minas Gerais, Brazil By CHARLES H. MAXWELL GEOLOGY AND MINERAL RESOURCES OF PARTS OF MINAS GERAIS...GERAIS, BRAZIL GEOLOGICAL SURVEY PROFESSIONAL PAPER 341-J Prepared in cooperation with the Departamento...Departamento National da Producao Mineral of Brazil under the auspices of the Agency for International Development | | | Journal (article/letter/editorial) | Zhu á R.K. O'Nions Monazite chemical composition: some implications for monazite geochronology Received:...An investigation of the chemical composition of monazite from a number of localities has been carried out...hydrothermal ore deposit. The REE distribution pattern of monazite varies greatly in accordance with its geological...distribution of monazite exerted by the host rock or source material from which monazite crystallised.... whereas monazites in rocks without garnet or monazite that formed after the garnet breakdown contain | | | Journal (article/letter/editorial) | THE DIAMOND-B[SARING MINAS REGION OF NORTHERN GERAES, BRAZIL. LUCIANO J. MORAES AND DJALMA GUIMAR_•ES...diamond-bearing regionin the northernpart of the Stateof Minas Geraesstretchesfrom the head-watersof the Jequitinhonha...northeasternflanks of Serra do Cabral, such as Burity Grande,Barreiro, Jequitahy,and othersoccurin the valleyof the...situatedthe principal mineral depositsof economicvalue to Brazil, such as iron, man- ganese,gold, and diamonds...meters. 502 DIAMOND-BEARING REGION 44ø OF BRAZIL. 5o3 43" MAP OF THE DIAMONDRE510NOF NORTHERN | | | Journal (article/letter/editorial) | The EBPP is situated mainly in the State of Minas Gerais, but encompasses also parts of the States of...Universidade Federal de Minas Gerais, Av. AntoÃnio Carlos 6277, 31 000 Belo Horizonte MG, Brazil the context of...Argentina, (2) the north-eastern or Borborema in Brazil, and (3) the Eastern Brazilian. A description of...pegmatites of the north-eastern Pegmatite Province of Brazil and their geochemistry have been studied by Beurlen...Province (EBPP) is situated mainly in the State of Minas Gerais but also encompasses the southern part of the | | | 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 | | Maheshwari, Anil, Sial, Alcides N., Gaucher, Claudio, Bossi, Jorge, Bekker, Andrey, Ferreira, Valderez P., Romano, Antonio W. (2010) Global nature of the Paleoproterozoic Lomagundi carbon isotope excursion: A review of occurrences in Brazil, India, and Uruguay. Precambrian Research, 182 (4) 274-299 doi:10.1016/j.precamres.2010.06.017 | Journal (article/letter/editorial) | carbon isotope excursion: A review of occurrences in Brazil, India, and Uruguay Anil Maheshwari a,∗ , Alcides...Department of Geology, UFPE, Recife, PE 50740-530, Brazil Departamento de Geología, Facultad de Ciencias...Geosciences, UFMG, Belo Horizonte, MG 30430-120, Brazil b c a r t i c l e i n f o Article history: Received... Keywords: Lomagundi excursion Carbon isotopes Brazil Uruguay India a b s t r a c t Positive carbon...Aravalli Supergroup (northwestern India), the Minas Supergroup (Brazil), and new sections of the Paso Severino | | 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) | bustamite (Mn), sanidine (K), celestite (Sr), monazite (La, Ce, Pr, Nd), and pure elements (Nb, Sb, Ta...Lueshe (Zaire) and bariopyrochlore from Minas Gerais (Brazil), which are excellent examples of secondary...pyrochloregroup minerals from the Lueshe and Araxá (Barreiro) carbonatites by 57Fe Mössbauer spectroscopy | | | Journal (article/letter/editorial) | t e / c h e m g e o Reaction microtextures of monazite: Correlation between chemical and age domains...domains in the Nazaré Paulista migmatite, SE Brazil Lucelene Martins ⁎, Silvio Roberto Farias Vlach, Valdecir...São Paulo, Rua do Lago, 562, 05508-080 São Paulo, Brazil a r t i c l e i n f o Article history: Received...September 2008 Accepted 21 September 2008 Keywords: Monazite Migmatite Crustal anatexis Electron microprobe...reveal complex compositional and age zoning in monazite crystals from different layers and textural positions | | | 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...1993). Other accessory minerals include apatite, monazite, sporadic barite, hematite, niobian rutile, thorite...included accelerating voltage of 15 kV (or 20 kV for monazite), and sample current on MgO of 20 mA. Standards...Institution of Washington, using techniques outlined by Barreiro & Cooper (1987). Mineral Chemistry Representative...magnesiocarbonatite containing dolomite – barite – monazite – quartz – isokite – apatite – strontianite at | | | Journal (article/letter/editorial) | Institute de Geociências, 70910-900, Brasilia DF, Brazil Downloaded by [George Mason University] at 04:55...2016 Abstract The Goiás stanniferous province in Brazil is characterized by the occurrence of cassiterite...in situ Th(U)-Pb method on single crystals of monazite from granites and metasomatites of the Serra Branca...structural zone in central Brazil. The Tocantins structural province in cen tral Brazil is a quite complex...time. Th(U)-Pb Results Zircon, together with monazite, is by far the mineral most often used in U-Pb | | | Journal (article/letter/editorial) | of the Czech Geological Society 48/12(2003) A monazite-forming reaction, CHIME U-Pb ages and the choice...Ma for CHIME analyses. This study, proposes a monazite-forming reaction, emphasizes the importance of...elemental maps support a monazite-producing reaction from detrital monazite, epidote and allanite (Fig...outcrops have All-Ep-Mnz+/-Xno complexes. Smith and Barreiro (1990) also observed All-Ep-Ap-Mnz complexes in...Maine Terrane, monazite was located in the center of these complexes. Smith and Barreiro (1990) concluded | | | 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) | for crystallization of metamorphic allanite and monazite in metapelites: a case study from the Miyar Valley...textural and chemical evolution of allanite and monazite along a well constrained prograde metamorphic...the occurrence of the first metamorphic monazite. Both monazite and allanite occur as inclusions in staurolite...the breakdown of allanite and the formation of monazite proceeded during staurolite crystallization. Staurolite...limit for the monazite forming reaction at ~600 °C. Preservation of allanite and monazite inclusions in |
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