 | Ladeira, A.C.Q., Ciminelli, V.S.T., Duarte, H.A., Alves, M.C.M., Ramos, A.Y. (2001) Mechanism of anion retention from EXAFS and density functional calculations: arsenic (V) adsorbed on gibbsite. Geochimica et Cosmochimica Acta, 65 (8) 1211-1217 doi:10.1016/s0016-7037(00)00581-0 | Journal (article/letter/editorial) | | calculations: Arsenic (V) adsorbed on gibbsite A. C. Q. LADEIRA,1 V. S. T. CIMINELLI,1,* H. A. DUARTE,2 M. C. M...geothermal activities, pesticides and dissolution of mine wastes. The mobility of arsenic in the environment...(ciminelli@ demet.ufmg.br). 1211 1212 A. C. Q. Ladeira et al. tional methods have been widely used to...procedure described above have been presented by Ladeira and Ciminelli (1998). The loaded gibbsite sample...other. Foster et al. (1998b), studying different mine tailings, determined coordination number ranging |  | Lobato, Lydia Maria, Ribeiro-Rodrigues, Luiz Cláudio, Zucchetti, Márcia, Noce, Carlos Maurício, Baltazar, Orivaldo Ferreira, da Silva, Luiz Carlos, Pinto, Claiton Piva (2001) Brazil's premier gold province. Part I: The tectonic, magmatic, and structural setting of the Archean Rio das Velhas greenstone belt, Quadrilátero Ferrífero. Mineralium Deposita, 36 (3) 228-248 doi:10.1007/s001260100179 | Journal (article/letter/editorial) | | 36: 228±248 DOI 10.1007/s001260100179 A RT I C L E Lydia Maria Lobato á Luiz ClaÂudio Ribeiro-Rodrigues...Pampulha, Belo Horizonte, Minas Gerais 31270-901, Brazil E-mail: lobato@dedalus.lcc.ufmg.br Fax: +55-31-4995410...L.C. da Silva á C.P. Pinto Companhia de Pesquisa e Recursos Minerais, Av. Brasil 1731, FuncionaÂrios...in the Nova Lima region is accommodated by roughly E±W-striking transcurrent faults, which are the most...1980s and the 1990s were characterized by a major eort to improve the geochronological data from the |  | Cabral, A. R., Lehmann, B., Galbiatti, H. F., Rocha Filho, O. G. (2006) Evidence for metre-scale variations in hematite composition within the Palaeoproterozoic Itabira Iron Formation, Minas Gerais, Brazil. Mineralogical Magazine, 70 (5) 591-602 doi:10.1180/0026461067050352 | Journal (article/letter/editorial) | | that Cr and Ti were mobile during metamorphism. Chromium was ultimately fractionated into the hematite...ores. Indeed, hematite seems to be ‘‘a mineral * E-mail: A.Cabral@ru.ac.za DOI: 10.1180/0026461067050352...Formation). In the Itabira district, where the Cauê mine is situated, the Caraça Group is lacking and the...Sad, 1973; Kessler and Müller, 1988; Klein and Ladeira, 2000). Bulk-rock data from Gongo Soco (Cabral...1973; Kessler and Müller, 1988; Klein and Ladeira, 2000). Chromium is found in 599 granoblastic magnetite-martite |  | | Journal (article/letter/editorial) | | 36: 249±277 DOI 10.1007/s001260100180 A RT I C L E Lydia Maria Lobato á Luiz ClaÂudio Ribeiro-Rodrigues... with the most important orebodies controlled by E±W-striking, strike-slip faults. The main mineralization...intensely carbonatized rock (e.g., the giant Morro Velho mine with >450 t of contained gold). Metabasalts host... Belo Horizonte, Minas Gerais, 31270-901, Brazil E-mail: lobato@igc.ufmg.br Fax: +55-31-4995410 L.C....gold deposits, the giant underground Morro Velho mine produced about 450 t Au, and was mined to a depth |  | Levett, Alan, Vasconcelos, Paulo M., Gagen, Emma J., Rintoul, Llew, Spier, Carlos, Guagliardo, Paul, Southam, Gordon (2020) Microbial weathering signatures in lateritic ferruginous duricrusts. Earth and Planetary Science Letters, 538. 116209 doi:10.1016/j.epsl.2020.116209 | Journal (article/letter/editorial) | | Perth 6009, Western Australia, Australia a r t i c l e i n f o Article history: Received 17 May 2019 Received... titanium, chromium and iron are depleted. Immobile elements including titanium, chromium and thorium...2012; Spier et al., 2018). * Corresponding author. E-mail address: alan.levett@uqconnect.edu.au (A. Levett)...resolution; for example, compare the aluminium and chromium NanoSIMS maps. Individual planes were aligned...Highly immobile elements such as titanium and chromium were the most useful for distinguishing weathered |  | | Journal (article/letter/editorial) | | in controlling As solubilities in acid mine drainage and mine-tailings ponds (Carlson et al., 2002)....reasons, problems with fits of EXAFS that include a 2 E complex, and wide-angle scattering data that fail...momentum quantum number) and an exponential part e⫺␣r. Density functional theory allows very large basis...energy difference between these complexes is real. Ladeira et al. (2001) used analogous DFT calculations on...sensitive to the lower limit chosen for the k-range. Ladeira et al. (2001) found no 2.85 peak in their EXAFS |  | Frei, R., Døssing, L.N., Gaucher, C., Boggiani, P.C., Frei, K.M., Bech Árting, T., Crowe, S.A., Freitas, B.T. (2017) Extensive oxidative weathering in the aftermath of a late Neoproterozoic glaciation – Evidence from trace element and chromium isotope records in the Urucum district (Jacadigo Group) and Puga iron formations (Mato Grosso do Sul, Brazil) Gondwana Research, 49. 1-20 doi:10.1016/j.gr.2017.05.003 | Journal (article/letter/editorial) | | Neoproterozoic glaciation – Evidence from trace element and chromium isotope records in the Urucum district (Jacadigo...Neoproterozoic glaciation – Evidence from trace element and chromium isotope records in the Urucum district (Jacadigo...Neoproterozoic glaciation – evidence from trace element and chromium isotope records in the Urucum district (Jacadigo...de Ciencias Geológicas, Facultad de Ciencias, PT E D b Iguá 4225–11400 Montevideo, Uruguay Instituto...Universidade de São Paulo, São Paulo, SP, Brazil e Environmental Archaeology and Materials Science, |  | | Journal (article/letter/editorial) | | Saskatchewan, Saskatoon, SK, S7N 5E2 Canada a r t i c l e i n f o Article history: Received 22 November 2012...serious environmental concern near abandoned mines and mine tailing discharge sites. Low-cost adsorptive removal...interlayer space. HT-LDHs are a natural sink near mine drainage sites (Ardau et al., 2007; Douglas et al...India. Tel.: + 91 755 4092316; fax: + 91 755 4092392. E-mail address: susanta@iiserb.ac.in (S. Paikaray)....bidentate–mononuclear complex (Fendorf et al., 1997; Ladeira et al., 2001). XPS survey spectra (Figs. A5 and |  | | Journal (article/letter/editorial) | | interesting to note that a plot of boron versus chromium contents of Fe-rich sediments shows a general...that chromium is a relatively immobile element, chromium was used instead of aluminium. Chromium has commonly...and modern Fe-rich marine deposits.15,20 Because chromium may display strong positive correlation with aluminium...seawater25 or an exhalative20 source of chromium. In both cases, chromium would not be related to the detrital...Fig. 4 could represent adsorption of boron and chromium onto Fe–Mn precipitates. Manganese enrichment |  | Cabral, A.R., Creaser, R.A., Nägler, T., Lehmann, B., Voegelin, A.R., Belyatsky, B., Pašava, J., Seabra Gomes, A.A., Galbiatti, H., Böttcher, M.E., Escher, P. (2013) Trace-element and multi-isotope geochemistry of Late-Archean black shales in the Carajás iron-ore district, Brazil. Chemical Geology, 362. 91-104 doi:10.1016/j.chemgeo.2013.08.041 | Journal (article/letter/editorial) | | formed under sulfide-free conditions (Klein and Ladeira, 2002; Fabre et al., 2011). 2. Geological setting...with UTM coordinates 574554.28 m E/9292889.28 m S, and 574867.63 m E/9293194.47 m S, respectively. These...which has a total extent of about 20 km trending from E–W (orebody D) to NW–SE (orebodies A–C). We have particularly...FeP and FePO were calculated from the extracted chromium-reducible sulfur SC R content in combination...fieldwork only. We then obtained information from the mine geologists that drill core from CE P S11D-214 |  | Sampaio, G.M.S., Pufahl, P.K., Raye, U., Kyser, K.T., Abreu, A.T., Alkmim, A.R., Nalini, H.A. (2018) Influence of weathering and hydrothermal alteration on the REE and δ56Fe composition of iron formation, Cauê Formation, Iron Quadrangle, Brazil. Chemical Geology, 497. 27-40 doi:10.1016/j.chemgeo.2018.08.014 | Journal (article/letter/editorial) | | University, Kingston, Ontario K7L3N6, Canada AC CE PT E * Corresponding author: Geraldo Magela Santos Sampaio...UFOP, 35400-000, Ouro Preto, Minas Gerais, Brazil. E-mail: geraldo.sampaio@ufop.edu.br Phone: (+55) 31...has undergone later supergene enrichment of Fe. PT E Petrographically, euhedral to subhedral magnetite...understand iron formation deposition and Fe ore- PT E D forming processes. Keywords: iron formation,... 2010; Klein, 2005; Konhauser et al., 2017). PT E Fe-rich lithofacies precipitated when this anoxic |  | Cox, Grant M., Halverson, Galen P., Minarik, William G., Le Heron, Daniel P., Macdonald, Francis A., Bellefroid, Eric J., Strauss, Justin V. (2013) Neoproterozoic iron formation: An evaluation of its temporal, environmental and tectonic significance. Chemical Geology, 362. 232-249 doi:10.1016/j.chemgeo.2013.08.002 | Journal (article/letter/editorial) | | Kingdom Harvard University, MA, USA a r t i c l e i n f o Article history: Accepted 5 August 2013...analysis . . . . . . . . ⁎ Corresponding author. E-mail address: grant.cox@mail.mcgill.ca (G.M. Cox)...occurring in discrete Mn-rich beds (Klein and Ladeira, 2004). 1. Introduction The apparent sudden reappearance...al. (2007), Klein and Beukes (1993), Klein and Ladeira (2004), Volkert et al. (2010), Gross (2009) and...Chemical Geology 362 (2013) 232–249 A B C D F E Fig. 2. (A) Holowilena iron formation at Holowilena |  | Trumbull, R. B., Garda, G. M., Xavier, R. P., Cavalcanti, J. A. D., Codeço, M. S. (2019) Tourmaline in the Passagem de Mariana gold deposit (Brazil) revisited: major-element, trace-element and B-isotope constraints on metallogenesis. Mineralium Deposita, 54 (3) 395-414 doi:10.1007/s00126-018-0819-z | Journal (article/letter/editorial) | | (2014) and Dorr (1969). The Passagem de Mariana mine is located in the SE corner of the map, marked by...Group (Dorr 1969; Machado et al. 1992; Klein and Ladeira 2000; Farina et al. 2016). The Minas Supergroup...2; Dorr 1969; Babinski et al. 1995; Klein and Ladeira 2000). The PM deposit produced more than 60 t of...of mining in the late seventeenth century until mine closure in 1985. The average gold grade in mineralized...quartz veins with tourmalinite selvages exposed in mine pillars b a 2m 2m a b 20 cm Legend Dolomite |  | Busigny, Vincent, Planavsky, Noah J., Goldbaum, Elizabeth, Lechte, Maxwell A., Feng, Lianjun, Lyons, Timothy W. (2018) Origin of the Neoproterozoic Fulu iron formation, South China: Insights from iron isotopes and rare earth element patterns. Geochimica et Cosmochimica Acta, 242. 123-142 doi:10.1016/j.gca.2018.09.006 | Journal (article/letter/editorial) | | article as: Busigny, V., Planavsky, N.J., Goldbaum, E., Lechte, M.A., Feng, L., Lyons, T.W., Origin of the...deposition (Klein and Beukes, 1993; Klein and Ladeira, 2004; Baldwin et al., 2012; Lechte and Wallace...deposition (e.g., Derry and Jacobsen, 1990; Klein and Ladeira, 2004; Johnson et al., 2008a, 2008b; Baldwin et...Fulu IF but in 5 higher proportion (see Fig. 2d,e). Some samples (SCF-3-1 to 3-5) collected at the bottom...Brazil, contain high concentrations of Mn (Klein & Ladeira 2004), the Fulu IF is not enriched in manganese |  | Brando Soares, Mariana, Corrêa Neto, Atlas Vasconcelos, Zeh, Armin, Cabral, Alexandre Raphael, Pereira, Larissa Fernandes, Prado, Milton Guimarães Bueno do, Almeida, Antônio Modesto de, Manduca, Luedson Guimarães, Silva, Pedro Henrique Montenegro da, Mabub, Ricardo Oliveira de Araújo, Schlichta, Thiago Mazutti (2017) Geology of the Pitangui greenstone belt, Minas Gerais, Brazil: Stratigraphy, geochronology and BIF geochemistry. Precambrian Research, 291. 17-41 doi:10.1016/j.precamres.2017.01.008 | Journal (article/letter/editorial) | | orogenic gold deposits such as the world-class Cuiabá mine, Raposos and Lamego. This belt has a diversity of...Pitangui greenstone belt such as in the Turmalina mine and in the recently discovered BIF-hosted São Sebastião...preserved features, varying between 0.5 and 30 m. Ladeira (1981) and Romano (2007) referenced the presence...be thin enough to not be seen in hand specimen. Chromium vs. Ni (Fig. 8b) show good correlation except...concordia age of 2859± 11 Ma (MSWDc.+e. =1.03, Probabilityc.+e.=0.38; c.+e.= concordance + equivalence), which |  | Yang, Xiuqing, Zhang, Zuoheng, Santosh, M., Duan, Shigang, Liang, Ting (2018) Anoxic to suboxic Mesoproterozoic ocean: Evidence from iron isotope and geochemistry of siderite in the Banded Iron Formations from North Qilian, NW China. Precambrian Research, 307. 115-124 doi:10.1016/j.precamres.2018.01.007 | Journal (article/letter/editorial) | | Adelaide, Adelaide, SA 5005, Australia b A R T I C L E I N F O A B S T R A C T Keywords: Band iron formations...Resources, Chang’an University, Xi’an 710054, China. E-mail address: xiuqing2008@126.com (X. Yang). https://doi...(buff in color) and silica laminae (white in color); e; Hand specimen of mixed carbonate-oxide facies BIFs...1993), Urucum BIFs (−7.02% to −4.42%; Klein and Ladeira, 2004) and Shilu BIFs (−12.7% to +1.0%; Xu et al...(1993), and 0.71 Ga Urucum BIFs from Klein and Ladeira (2004). with seawater, and indicates inorganic |  | | Journal (article/letter/editorial) | | quartz matrix along late shear planes. Undeformed E - W trending banded quartz veins are present in the...conditions. There is no alteration halo around the E-W quartz veins. Ultramylonites, hydrothermally altered...carbonate hydrothermal alteration. 212 T h e a i m of this p a p e r is: (1) to describe briefly the different...veins of A m e s m e s s a a n d their struct u r a l r e l a t i o n s h i p s to the s h e a r zone; (2)...m i n e r a l a n d g e o c h e m i c a l characteristics of the h y d r o t h e r real a l t e r a t |  | Viehmann, Sebastian, Bau, Michael, Bühn, Bernhard, Dantas, Elton L., Andrade, Fábio R.D., Walde, Detlef H.G. (2016) Geochemical characterisation of Neoproterozoic marine habitats: Evidence from trace elements and Nd isotopes in the Urucum iron and manganese formations, Brazil. Precambrian Research, 282. 74-96 doi:10.1016/j.precamres.2016.07.006 | Journal (article/letter/editorial) | | 562, 05508-080 São Paulo, SP, Brazil b a r t i c l e i n f o Article history: Received 10 March 2016...multicellular life. Combined ⇑ Corresponding author. E-mail address: s.viehmann@jacobs-university.de (S....terrigenous supply (Graf et al., 1994; Klein and Ladeira, 2004; Angerer et al., 2016). Particle-reactive...REY distributions (Graf et al., 1994; Klein and Ladeira, 2004; Angerer et al., 2016) and, therefore, the...It is from a large exposure in the mining area of mine 1B showing red-coloured, ferruginous diamictites |  | Teixeira, Wilson, Carneiro, Maurício Antônio, Noce, Carlos Maurício, Machado, Nuno, Sato, Kei, Taylor, Paul Nigel (1996) Pb, Sr and Nd isotope constraints on the Archaean evolution of gneissic-granitoid complexes in the southern São Francisco Craton, Brazil. Precambrian Research, 78 (1) 151-164 doi:10.1016/0301-9268(95)00075-5 | Journal (article/letter/editorial) | | Noce c Nuno Machado d, Kei Sato a, Paul Nigel Taylor e a Geochronological Research Center-- CPGeo, Institute...a Geotop, Universit~ du Quebec ~ Montreal, Canada e Department of Earth Sciences, University of Oxford...Espinhaqo Supergroup; 7 = mafic dikes (Proterozoic); E = Esmeraldas; D = Divin6polis; I = Itafina; S = Santa...+ 102 Ma (sample M-120, Table 2). 155 Negative e N d ( t ) values (see Table 2) calculated for the...gneissessoutheastof Sete Lagoas city (BHC). 157 B e t i m - Contagem gneisses 0 7400 J 0.7300 ,~='/= |  | | Journal (article/letter/editorial) | | Cameroon C. E. Suh, Buea and B. Lehmann, Clausthal Zellerfeld With 8 figures and 4 tables Suh, C. E. & Lehmann...$ 5.25 ã 2003 E. Schweizerbart’sche Verlagsbuchhandlung, D-70176 Stuttgart 256 C. E. Suh and B. Lehmann...Lehmann (Freyssinet et al. 1989), Syama Mine, Mali (Bowell et al. 1996), Kalgoorlie and Boddington, Australia...profile (adapted from Gazel & Gérard 1954). 258 C. E. Suh and B. Lehmann Table 1. Bulk geochemical data...tourmaline, barite, and chlorite ± epidote. 260 C. E. Suh and B. Lehmann Ore minerals occurring in association |  | Giuliani, G., France-Lanord, C., Zimmermann, J. L., Cheilletz, A., Arboleda, C., Charoy, B., Coget, P., Fontan, F., Giard, D. (1997) Fluid Composition, δD of Channel H2O, and δ18O of Lattice Oxygen in Beryls: Genetic Implications for Brazilian, Colombian, and Afghanistani Emerald Deposits. International Geology Review, 39 (5) 400-424 doi:10.1080/00206819709465280 | Journal (article/letter/editorial) | | France-Lanord , J. L. Zimmermann , A. Cheilletz c d e f g , C. Arboleda , B. Charoy , P. Coget , F. Fontan...Calle 32, no. 13-07, Bogotá, AA 17521, Colombia e Ecole Nationale Superieure de Geologie—Institut National...Abstract T h e fluid c o m p o s i t i o n , δD of c h a n n e l H 2 O , a n d δ18O of l a t t i c e o x y g...g e n have b e e n d e t e r m i n e d in b e r y l a n d e m e r a l d from a v a r i e t y of geological...geological e n v i r o n m e n t s a n d u s e d t o c o n s t r a i n t h e o r i g i n of t h e p a r e n t |  | | Journal (article/letter/editorial) | | • TPI.••_ Goldorezone /•• PaW • •••• •u• • •0• e '•• • •• f18 / - . . PARENTROCKS: 1•Metabasalts...0 18.0-20.0 18.0-20.0 20.0-21.0 Ag 16Pm ?e ,. r E 002õ FIG. 6. Backscattered electronmicroprobeimagesof...with amorphousgoethite(6.9-10.5 m, test pit 12). E. $ubidiomorphic goldcrystalassociated with needlelike...and electrum,intiOuro, CentralBahia,Brazil,in Ladeira,E. A. ed., Brazilgold matelyassociated with goethite...finenessof gold increasesdownward Saueressig, R., Meireles,E. M., andTeixeira, J. F., 1982, Serra dosCaraj'fis-Para |  | Bosco-Santos, Alice, Gilhooly, William Patrick, Fouskas, Fotios, Fabricio-Silva, Wendell, Oliveira, Elson Paiva (2020) Euxinia in the Neoarchean: The starting point for early oxygenation in a Brazilian Craton. Precambrian Research, 341. 105655 doi:10.1016/j.precamres.2020.105655 | Journal (article/letter/editorial) | | Patrick Gilhooly III, F. Fouskas, W. Fabricio-Silva, E. Paiva Oliveira, Euxinia in theNeoarchean:The starting...pyrrhotite 147 and pyrite, was extracted by chromium reduction (Canfield et al., 1986) and sulfide...extracts all sulfides, herein 149 we refer to the chromium reducible sulfur fraction as FePy to remain consistent...(FeHR/FeT and 186 FePy/FeHR) and δ34S and 33S of chromium reducible sulfides are shown in Figure 3. Aluminum...(Table 2). 204 The sulfur isotopic composition of chromium reducible sulfides was variable throughout 205 |  | Fabre, Sébastien, Nédélec, Anne, Poitrasson, Franck, Strauss, Harald, Thomazo, Christophe, Nogueira, Afonso (2011) Iron and sulphur isotopes from the Carajás mining province (Pará, Brazil): Implications for the oxidation of the ocean and the atmosphere across the Archaean–Proterozoic transition. Chemical Geology, 289 (1) 124-139 doi:10.1016/j.chemgeo.2011.07.019 | Journal (article/letter/editorial) | | u r n a l h o m e p a g e : w w w. e l s ev i e r. c o m / l o c a t e / c h e m g e o Iron and sulphur...Universidad federal do Pará, Belem, Brazil b a r t i c l e i n f o Article history: Received 22 July 2010 Received...Ga old palaeosols display ⁎ Corresponding author. E-mail address: fabre@lmtg.obs-mip.fr (S. Fabre). 0009-2541/$...RIK E- b SERRA PELADA CIGANO GRANITE BAHIA 500 km SERRA DO PA R E D Ã O A R AG UA I A B E LT ...somewhat controversial. A DOCEGEO (Rio Doce Geologia e Mineração S.A.) report (1988) suggested that the Aguas |  | | Journal (article/letter/editorial) | | Walde (1988), Urban et al. (1992)). Klein and Ladeira (2004), Angerer et al. (2016), 65 Viehmann et...110 2008; Duuring and Hagemann, 2012; Figueiredo e Silva et al., 2008; Gutzmer et al., 2005; 111 Lobato...Urucum Mineração operated 124 an underground Mn mine at the Morro do Urucum. Mineração Corumbaense Reunida...pit with colluvial Fe ore and one underground Mn mine at the 130 Morro do Urucum. In 2004, Vale S.A...Monjolinho), around the 133 present colluvial iron ore mine at Morraria Grande (Figure 1). Currently, a total |
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