 | | Journal (article/letter/editorial) | | water samples collected from two mine sites in Brazil. Aqueous speciation of acid mine waters is a dif...stoichiometry for the aqueous ions as that for goethite: Fe(OH) 3 +3H + = F e 3 + + 3 H 2 O , (1) FeOOH+3H...hydrous ferric oxides ranges from about -0.2 for goethite (D'yakonov et al., 1994; Sergeeva et al., 1999)...shifted down from the initial p H line). The p H values do not agree Downloaded by [Acadia University] at...mine and the Morro do Ferro thorium and rare-earth-element deposit near Pogos de Caldas, Brazil (Chapman |  | | Journal (article/letter/editorial) | | FORTALEZA DE MINAS DEPOSIT, BRAZIL: EVIDENCE OF HYDROTHERMAL REMOBILIZATION Carolina Michelin de ALMEIDA...Ontario K7L 3N6, Canada Sebastião Gomes de CARVALHO Departamento de Petrologia e Metalogenia, Universidade...Rio Claro, São Paulo, 13506-900, Brazil Abstract The Fortaleza de Minas Ni–Cu–PGE sulfide deposit is hosted...hosted by Archean komatiitic rocks of the Morro do Ferro greenstone belt, near the southwestern margin...margin of the São Francisco craton, Minas Gerais state, Brazil. The deposit contains 6 million tonnes of ore |  | | Report (issue) | | BR-76 MINISTERIO DAS MIMAS E ENERGIA COMPANHIA DE PESQUISA DE RECURSOS MINERAIS UNITED STATES DEPARTMENT...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...Distribution of alkalic intrusives in Southern Brazil .. 16 Alkalic intrusions in the western side of...geologic setting of deposits .............. 24 Minas Gerais ...................................... 24 Bahia |  | | Journal (article/letter/editorial) | | within six natural analogue studies: Pocß os de Caldas, Cigar Lake, Maqarin, El Berrocal, Oklo and Palmottu...undertaken in the following systems: Pocß os de Caldas (Brazil), a Mesozoic volcanic ring-structure hosting...methodology of the BPM exercises, from the Pocß os de Caldas to the Oklo and Palmottu projects, has not varied...included in this revision: Pocßos de Caldas: SKB (Sweden), KTH (Sweden), PSI (Switzerland)...model the U/Fe association was done in Pocß os de Caldas by assuming the coprecipitation of U3O8 with Fe(OH)3 |  | Bruno, J, Duro, L, de Pablo, J, Casas, I, Ayora, C, Delgado, J, Gimeno, M.J, Peña, J, Linklater, C, Pérez del Villar, L, Gómez, P (1998) Estimation of the concentrations of trace metals in natural systems. Chemical Geology, 151 (1) 277-291 doi:10.1016/s0009-2541(98)00085-0 | Journal (article/letter/editorial) | | Berrocal žSpain / and Poços de Caldas žBrazil / J. Bruno a,) , L. Duro a , J. de Pablo b, I. Casas b, C....Barcelona, Spain ETSEIB, UniÕersitat Politecnica de Catalunya, AÕda. Diagonal 647, 08028 Barcelona, Spain...Franques, ` 08028-Barcelona, Spain Ciemat, Centro de InÕestigaciones Energeticas, Medioambientales y Tecnologicas...methodology to the El Berrocal ŽSpain. and Poços de Caldas ŽBrazil. sites. Trace metals under investigation...oxyhydroxides Žboth in El Berrocal and in Poços de Caldas., Ž2. the interaction of barium and manganese |  | | Journal (article/letter/editorial) | | measured in groundwaters from the Pocos de Caldas complex in Brazil. INTRODUCI’ION During the past years...information on the adsorption of carbonate on goethite and hematite suggests that coordinative interactions...groundwaters from Osamu Utsumi uranium mine and Morro do Ferro thorium/rare earth deposit. The groundwaters...in twenty water samples from the Poqos de Caldas complex (Brazil), The saturation indexes were calculated...different locations of the Osamu Utsumi and Morro do Ferro deposits (NORDSTROMet al., 1991a). We have |  | 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) | | * Departament de Cristal·lografia, Mineralogı́a i Dipòsits Minerals, Universitat de Barcelona, c/Martı́...Departamento de Geologia, Faculdade de Ciências, Universidade Agostinho Neto, Av. 4 de Fevereiro 7,...processes have produced late-stage carbonates, goethite, hollandite and rare earth element (REE) minerals...distribution of carbonatites and kimberlites. Modified after de Carvalho et al. (2000). 394 NIOBIUM AND RARE EARTH...supergene minerals including botryoidal aggregates of goethite or hollandite (Fig. 5f). The contact between these |  | Fernandes, Alexandre Martins, Conceição, Fabiano Tomazini da, Spatti Junior, Eder Paulo, Sardinha, Diego de Souza, Mortatti, Jeferson (2016) Chemical weathering rates and atmospheric/soil CO2 consumption of igneous and metamorphic rocks under tropical climate in southeastern Brazil. Chemical Geology, 443. 54-66 doi:10.1016/j.chemgeo.2016.09.008 | Journal (article/letter/editorial) | | metamorphic rocks under tropical climate in southeastern Brazil Alexandre Martins Fernandes, Fabiano Tomazini da...da Conceição, Eder Paulo Spatti Junior, Diego de Souza Sardinha, Jeferson Mortatti PII: DOI: Reference:...Conceição, Fabiano Tomazini, Spatti Junior, Eder Paulo, de Souza Sardinha, Diego, Mortatti, Jeferson, Chemical...metamorphic rocks under tropical climate in southeastern Brazil, Chemical Geology (2016), doi: 10.1016/j.chemgeo...tropical climate in southeastern SC RI P T Brazil NU Alexandre Martins Fernandes1, Fabiano Tomazini |  | | Report (issue) | | PLURINATIONAL STATE OF BOSNIA AND HERZEGOVINA BOTSWANA BRAZIL BRUNEI DARUSSALAM BULGARIA BURKINA FASO BURUNDI...remain the responsibility of the contributors and do not necessarily represent the views of the IAEA or....................................... 38 6.4.3. Brazil..................................................most frequent concentrations of thorium in monazite do not exceed 10%. Other common minerals, however lower...specific circumstances, thorium may form deposits that do not contain uranium or only in very small amounts |  | | Journal (article/letter/editorial) | | sorbed onto amorphous Fe oxides. In contrast, goethite-rich nodules from the pan have a low REE content...preferential sorption onto Fe oxides (Koeppenkastrop and De Carlo, 1993; White, 2000) as well as clay minerals...SS7cC Pan sediments ZA-SS1 micaceous sand ZA-SS8 goethite nodule ZA-SS2b black mud ZA-SS2c green muddy sand...relative to the granite (Fig. 8). The REE content of goethite-rich nodules from the surface of Fig. 10. REE...metal oxides more so than HREE (Koeppenkastrop and De Carlo, 1993). In addition, synthetic ferrihydrite |  | | Journal (article/letter/editorial) | | precipitation/coprecipitation equilibria ‘MBT, J. BRUNO, I.*.+ J. DE PABLO,~L. DURO,~ and E. FIGUEROLA’ Tecnologia Ambiental...silica-gel column method developed in our laboratories (De Pablo et al., 1992). This method uses a complexing...Hematite syn (WL: 1.5406 Ao) G 29-0713 FeO(OH) Goethite (WL: 1.5406 Ao) I I FIG.2. X-Ray Diffractograms...coprecipitated at 3% of uranium. The hematite (a-Fe20J) and goethite (mFeOOH) patterns are also shown. (a) X-Ray of...pattern of hematite is clearly defined, and also goethite appears. These results agree with the information |  | | Journal (article/letter/editorial) | | and by alkaline volcanic rock in the Poços de Caldas, Brazil. One rare study of a granite-hosted uranium...calcite Ž3–5%. and trace Fe-oxides Žhematite, goethite and ferrihydrite.. The clay size fractions consist... Testing of geochemical models in the Poços de Caldas analogue study. Nagra Tech. Rep., NTB 90-29rSKB..., Shea, M.E., Smellie, J.A.T., 1992a. The Poços De Laldas Project: natural analogues of processes in...Shea, M.E., Smellie, J.A.T., 1992b. The Poços De Caldas: an introduction and a summary of its implications |  | | Journal (article/letter/editorial) | | Madeira Sn-Nb-Ta world-class deposit (Pitinga, Brazil) Ingrid.W. Hadlich, Artur C. Bastos Neto, Nilson...Madeira Sn-Nb-Ta world-class deposit (Pitinga, Brazil), Ore Geology Reviews (2019), doi: https://doi...Madeira Sn-Nb-Ta world-class deposit (Pitinga, Brazil). Ingrid. W. HADLICH1, Artur C. BASTOS NETO2, Nilson...Programa de Pós-graduação em Geociências, Instituto de Geociências, Universidade Federal do Rio Grande...Grande do Sul. Avenida Bento Gonçalves 9500, Porto Alegre, 91501-970, RS, Brazil. ingrid.hadlich@ufrgs.br |  | | Journal (article/letter/editorial) | | changes in dissolved REE concentration at F3, nor do they help to explain the systematic variation in...prepared FeOOH. In a similar study, Koeppenkastrop and De Carlo (1992) reported Kd values of 105 to 106 for...and amorphous HFO and goethite at pH 7.9. Although the Koeppenskastrop and De Carlo (1992) study showed...noted in similar experiments conducted at lower pH (De Carlo et al., 1998). This difference in sorption...seawater. Geochim. Cosmochim. Acta 57, 519 –526. De Carlo E. H., Wen X.-Y., and Irving M. (1998) The |  | | Journal (article/letter/editorial) | | nappes d’eau souterraines ont été échantillonnés près de deux gisements du sulfures massifs intacts, Halfmile...le camp minier de Bathurst, au Nouveau-Brunswick, Canada. Dans la plupart des cas, de tels sédiments...Les oxyhydroxides de fer sont probablement présents sous forme de recouvrements de surface, en partie...suspension prélevés des trous de forage qui croisent le gisement de Restigouche près de son expression à la surface...surtout des sulfates, de Fe, Pb, et de Zn, ainsi que des particules de sulfure de fer. En général, ces |  | Walter, A.-V., Nahon, D., Flicoteaux, R., Girard, J.P., Melfi, A. (1995) Behaviour of major and trace elements and fractionation of REE under tropical weathering of a typical apatite-rich carbonatite from Brazil. Earth and Planetary Science Letters, 136 (3) 591-602 doi:10.1016/0012-821x(95)00195-i | Journal (article/letter/editorial) | | weathering of a typical apatite-rich carbonatite from Brazil A.-V. Walter aT*,D. Nahon b, R. Flicoteaux b, J...Marseille Cedex 20. France h Laboratoire de Gt!osciences de I’Enuironnement, URA CNRS 132. Uniuersitt...d’Aix-Marseille III, 13397 Marseille Cedex 20, France ’ Bureau de Recherche Giologique et Mini&es, Dipartement Giochimie...ansCedex 2. France ’ Instituto de Astronomia e Geojisica, Unioersidade de Sad Paula, 4200 aoenida Miguel...Miguel Stefano, CP 30627, 0100 Sac?Paula. Brazil Received 12 December 1994; revised 5 August 1995; accepted |  | | Journal (article/letter/editorial) | | carbonatite at Mt Weld, Western Australia Finland, Brazil, Guyana, Kenya, Tanzania, Zaire and Uganda (McNeil...hydrous Fe - Nb degradation product (?Nb-bearing goethite), whereas others are partly or totally replaced...assumptions are valid because the abundance of goethite, lepidocrocite, hematite and maghemite and the...carbonatite in Canada and from carbonatite laterites in Brazil. Long-term, deep weathering processes of the carbonatite...horizon at Mt Weld, where there is carbonate present, do pyrochlores possess elevated CaO, SrO and Na20 contents |  | | Journal (article/letter/editorial) | | Martin et al., 1976; Elderfield and Greaves, 1982; De Baar et al., 1985; Goldstein and Jacobsen, 1988;...Sholkovitz, 1995; Elbaz-Poulichet and Dupuy, 1999; De Carlo et al., 2000). Experimental studies demonstrate...between aqueous and solid phases (Koeppenkastrop and De Carlo, 1992; Sholkovitz, 1992; Sholkovitz et al...., Sholkovitz, 1995; Byrne and Sholkovitz, 1996). De Carlo et al. (2000) evaluated the scavenging of REEs...Geochemistry 19 (2004) 1339–1354 4.4 4.2 pH 4.0 Portal do 3.8 wn gr ad 3.6 ie n t 3.4 3.2 (a) 3.0 |  | | Journal (issue) | | (049)-5132-836716 e-mail: envgeo@freenet.de Anne Marie De Grosbois for submittal of items for: Views and news...York Skougstad MW, Fishman MJ, Friedman LC, Erdmann DE, Duncan SS (1979) Methods for determination of inorganic...in both creeks were dependent on the water pH and de- Department of Geology and Geophysics University...(Benja- analyses, Yun et al. (2001) suggested that goethite is likely the most important scavenger (absorbent)...charge values (ZPC), although Fe oxyhydroxide (goethite) is believed to act as the major sorbent in the |  | | Book (edition) | | Salinas, Peru, H Variscite, xx 5 mm, Iturnbiara, Brazil, H Rhodocbrosite, polished, 50 mm, Capillitas,... China, H Page 1: MuscO\ite. 45 mm, Linopolis, Brazil, H Page 2: Vivianite, I 00 mm, Huanzala, Bolivia...Ethiopia, G Page 12: Brazilianite, 35 mm, Linopolis, Brazil, H Page 13: Gold, 35 mm.Eagle's est Mine, California..."Dana's System of Mineralogy•· ( 1944, I 951, 1962). de Fourestier (1999) and Strunz and Nickel (2001). Mi11eral...ASG -Archives de Science Geneve BM - Bulletin de la Societe fram;aise de mineralogie et de cristallographie |  | | Book | | present level of exposure. Even when veins 1008 do occur within or in the proximity of a "granite",... because most postmagmatic hydrothermal deposits do occur in the proximity, in the aureole of igneous...Paredes J.) in Bellido and de Montreuil (1972). Abbreviations: CP=Cerro de Pasco; M=Morococha; Ml=Mala...around the Andean Batholith of Peru (Bellido and de Montreuil, 1972; Putzer, 1976; Hollister, 1978) is...major Pb,Zn,Ag replacements and veins (e.g. Cerro de Pasco, Casapalca; Chapter 26), all marked by intensive |  | | Report (issue) | | (Australia) Pervomayskoye (Ukraine), Lagoa Real (Brazil), Valhalla (Australia) Pribram , Jachymov (Czech...(and other) rocks and commonly contain deposits that do not fit into other types, and have origins that are...examples of this deposit type are Lagoa Real in Brazil, Zheltye Vody deposit in Ukraine and Valhalla in...fertilizers by several countries and most countries do not report U from phosphorite as a resource. (8)...of Th include Australia, USA, Turkey, India and Brazil, although most countries have not been diligent |  | | Book (edition) | | International Symposium on Carbonatites in Pocos de Caldas, Brazil for which this writer was keynote speaker... 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...Survey and H. S. de Schmid (1912) Figure 12-4 : Canadian Geological Survey and H. S. de Schmid (1912) Figure |  | | Journal (article/letter/editorial) | | Alfonso Yuste Oliete3 Departamento de Ciencias de la Tierra, Universidad de Zaragoza, Pedro Cerbuna 12, 50...presence of opaque minerals, such as hematite, goethite and pyrite, and transparent resistant minerals...metal oxides more so than HREE (Koeppenkastrop and De Carlo, 1993). The abundance of X-ray amorphous iron...controlling the REE abundances in these rocks than do clay minerals. In contrast, similar mean values that...relatively immobile in the sedimentary environment (as do Al and Ti), thus they reflect provenance composition |  | | Journal (article/letter/editorial) | | Gillulyite Glauconite Glaucophane Gmelinite-(Na) Goethite Gold native Goldfieldite Gorceixite Goyazite Graphite...orientation of individual veins is often seen, they do not show up in platform sediments far off the uplifted...control on the aerial extension of these veins which do not reach very deep into the host rock underneath...which sometimes are enriched in inorganic compounds do not directly fit in this differentiation scheme and...classification scheme like this, these man-made raw materials do not fit in, even if they are primarily derived from |
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