Selected Publications

Environmental mineralogy

- Le fer dans les kaolins. Etude par spectrométries RPE, Mossbauer, EXAFS. D. BONNIN, S. MULLER et G. CALAS. Bull. Minéral., 105, 467-475 (1982).

- Heterogeneous distribution of nickel in hydrous silicates from New Caledonia ore deposits. A. MANCEAU and G. CALAS. Amer. Mineral., 70, 549-558 (1985).

- Nickel-bearing clay minerals. 1. Spectroscopic study of nickel crystal chemistry. A. MANCEAU, A. DECARREAU and G. CALAS. Clay Miner., 20, 367-387 (1985).

- Site occupancy of Fe³⁺ in Garfield nontronite: a spectroscopic study. D. BONNIN, G. CALAS, H. SUQUET and H. PEZERAT. Phys. Chem. Minerals, 12, 55-64 (1985).1986

- Nickel-bearing clay minerals. 2. Intracrystalline distribution of nickel: a spectroscopic study. A. MANCEAU and G. CALAS. Clay Miner., 21, 341-360 (1986).

- Crystal chemistry of cobalt and nickel in lithiophorite and asbolane from New Caledonia. A. MANCEAU, S. LLORCA and G. CALAS. Geochim. Cosmochim. Acta., 51,105-113 (1987).

- Formation of ferric oxides from aqueous solutions: a polyhedral approach by X-ray absorption spectroscopy. 1. Hydrolysis and formation of ferric gels. J.M. COMBES, A. MANCEAU, G. CALAS and J.Y. BOTTERO. Geochim. Cosmochim. Acta., 53, 583-594 (1989).

- XAS study of the evolution of local order around Fe(III) in the solution to gel to α-Fe₂O₃ transformation. J.M. COMBES, A. MANCEAU and G. CALAS. Physica B, 158, 419-420 (1989).

- Formation of ferric oxides from aqueous solutions: a polyhedral approach by X-ray absorption spectroscopy. 2. Hematite formation from ferric gels. J.M. COMBES, A. MANCEAU and G. CALAS. Geochim. Cosmochim. Acta , 54, 1083-1091 (1990).

- Mn²⁺-bearing kaolinites from lateritic weathering profiles: geochemical significance. J.P. MULLER and G. CALAS Geochim. Cosmochim. Acta, 57, 1029-1037 (1993).

- Fe-speciation in kaolins: a diffuse reflectance study. N. MALENGREAU, J.P. MULLER and G. CALAS. Clays Clay Miner., 42, 137-147 (1994).

- ²⁷Al MAS NMR and Aluminum X-ray Absorption Near Edge Structures study of imogolite and allophanes. Ph. ILDEFONSE, R.J. KIRKPATRICK, B. MONTEZ, G. CALAS, A.M. FLANK and P. LAGARDE. Clays Clay Miner., 42, 276-287 (1994).

- Spectroscopic approach for investigating the status and mobility of Ti in kaolinitic materials. N. MALENGREAU, J.P. MULLER and G. CALAS. Clays Clay Miner., 43, 615-621 (1995).

- Low Z elements (Mg, Al and Si) K-edge spectroscopy in minerals and disordered systems. Ph. ildefonse, G. calas, A.M. flank and p. lagarde. Nucl. Instr. Methods B97, 172-175 (1995).

- Crystal  chemistry  of  clays  and associated  oxides:  constraints  for  modeling  element transfer  at the Earth's surface. J.P. Muller, A. Manceau, J.L. HAZEMANN, T. ALLARD, Ph. Ildefonse and G. Calas. Amer. J. Sci., 295, 1115-1155 (1995).

- Cr³⁺ in phyllosilicates: influence of the nature of coordinating ligands and their next cationic neighbors on the crystal field parameters. Platonov, A.N., Langer, K., Andrut, M. and Calas, G. In: Dyar, M.D., Mc Cammon, C.A., Shaeffer, M.W. (Editors), Mineral spectroscopy: A tribute to Roger G. Burns: Geochem. Soc. Spec. Pub., 5, 41-48 (1996).

- Impuretés et défauts dans les minéraux de basse température: des témoins de leur histoire. T. Allard, G. Calas, P. Ildefonse, G. Morin et J.P. Muller. C.R. Ac. Sci., 325, 1-10 (1997).

- Aluminum X-ray absorption near edge structure in model compounds and Earth's surface minerals. Ildefonse Ph., Cabaret D., Sainctavit Ph., Calas G., Flank A.M. and P. lagarde. Phys. Chem. Miner., 25, 112-121 (1998).

- XAFS Determination of the Chemical Form of Lead in Smelter-Contaminated Soils and Mine Tailings: Importance of sorption processes. G. Morin, J. Ostergren, F. Juillot, Ph. Ildefonse,  G. Calas and G.E. Brown. Amer. Mineral., 84, 420-434 (1999). (Best paper, American Mineralogist 1999).

- Structural chemistry of uranium associated with Si, Al, Fe gels in a granitic uranium mine. T. Allard, P. Ildefonse, C. BEAUcaire and G. Calas. Chem. Geol., 158, 81-103 (1999).

- Remobilization of arsenic from buried wastes at an industrial site: mineralogical and geochemical control. Appl. Geochem., 14, 1031-1048 (1999).

- Surface chemistry of weathered zircons. E. Balan, P. Trocellier, J. Jupille, E. Fritsch, J.-P. Muller and G. Calas. Chem. Geol., 181, 13-22 (2001).

- Mineralogy of lead in a soil developed on a Pb-mineralized sandstone (Ardèche, France). G. Morin, F. Juillot, P. Ildefonse, G. Calas, J.C. SAMAMA, P. Chevallier and G.E. Brown, Jr.. Amer. Mineral., 86, 92-104 (2001).

- First principles study of water adsorption on the (100) surface of zircon : implications for zircon dissolution. E. Balan, F. Mauri, J.P. Muller and G. Calas. Amer. Mineral., 86, 910-914 (2001).

- Metamictization and chemical durability of detrital zircon. E. Balan, D. Neuville, P. Trocellier, E. Fritsch, J.-P. Muller and G. Calas Amer. Mineral., 86, 1025-1033 (2001).110

- Unraveling the atomic structure of biogenic silica: evidence of the structural association of Al and Si in diatom frustules. M. Gehlen, L. Beck, G. Calas, A.M. Flanck, J.A. von Bennekom and J. van Beusekom. Geochim. Cosmochim. Acta, 66, 1601-1609 (2002).

-- EXAFS evidence of sorbed arsenic (V) and pharmacosiderite in a soil overlying the Echassières geochemical anomaly, Allier, France. G. Morin, D. LECOCQ, F. Juillot, G. Calas, P. Ildefonse, S. BELIN, V. BRIOIS, P. DILLMANN, P. CHEVALLIER, C. GAUTHIER, A. SOLE, P.E. PETIT and S. BORENSZTAJN. Bull. Soc. Géol. France, 173, 281-291 (2002)._

- Occurrence of Zn/Al hydrotalcite in smelter-impacted soils from northern France: Evidence from EXAFS spectroscopy and chemical extractions. F. JUILLOT, G.MORIN, PH.ILDEFONSE, T. P. TRAINOR, M. BENEDETTI, L. GALOISY, G. CALAS and G. E. BROWN JR. Amer. Mineral., 88, 509-526 (2003).

- Bacterial formation of tooeleite and mixed arsenic(III) or arsenic(V)-iron(III) gels in the Carnoulès acid mine drainage, France. A XANES, XRD and SEM study MORIN G., JUILLOT F., CASIOT C., BRUNEEL O., PERSONNÉ J-C., ELBAZ-POULICHET F., LEBLANC M., ILDEFONSE Ph., CALAS G. Envir. Sci.Technol., 37, 1705-1712 (2003).

- Revealing forms of iron in river-borne material from major tropical rivers of the Amazon Basin (Brazil). ALLARD T., MENGUY N., SALOMON J., CALLIGARO T., WEBER T., CALAS G., BENEDETTI M. F. Geochim. Cosmochim. Acta. 68, 14, 3079-3094 (2004).

- Formation and evolution of lateritic profiles in the middle Amazon basin: Insights from radiation-induced defects in kaolinite. E. Balan, T. Allard, E. Fritsch, M. Sélo, C. Falguères, F. Chabaux, M.-C. Pierret and G. Calas. Geochim. Cosmochim. Acta, 69, 2193-2204 (2005).

- Environmental Interfaces, Heavy Metals, Microbes, and Plants Applications of XAFS Spectroscopy and Related Synchrotron Radiation Methods to Environmental Science. BROWN G.E. Jr, J. G.  CATALANO, A. S.  TEMPLETON, T. P.  TRAINOR, F.  FARGES, B. C.  BOSTICK, T. KENDELEWICZ, C. S.  DOYLE, A. M.  SPORMANN, K. REVILL, G.  MORIN, F. JUILLOT, G. CALAS Physica Scripta, 115, 80-87 (2005).

- Transformation of haematite and Al-poor goethite to Al-rich goethite and associated yellowing in a ferralitic clay soil profile of the middle Amazon Basin (Manaus, Brazil). E. FRITSCH, G. MORIN, A. BEDIDI, D. BONNIN, E. BALAN, S. CAQUINEAU and G. CALAS. Eur. J. Soil Sci, 56, 575-588 (2005).

- EXAFS analysis of Arsenite Adsorption onto 2-line Ferrihydrite, Hematite, Goethite, and Lepidocrocite: Influence of the Surface Structure. ONA-NGUEMA G., MORIN G., JUILLOT F., CALAS G., BROWN Jr. G.E. Environ. Sci.Technol., 39,  9147-9155 (2005).

- XAS evidence of As(V) association with iron oxyhydroxides in a contaminated soil at a former arsenical pesticide processing plant B. CANCÈS, F. JUILLOT, G. MORIN, V. LAPERCHE, L. ALVAREZ, O. PROUX,, J-L. HAZEMANN, G. E. BROWN Jr, G. CALAS. Environ. Sci.Technol., 39, 9398-9405 (2005).

- Arsenic in soils, mine tailings and former industrial sites. G. MORIN and G. CALAS. Elements, 2, 97-101 (2006).

- EXAFS signature of structural Zn at trace levels in natural and synthetic tri- and dioctahedral 2:1 phyllosilicates. Juillot, F., Morin, G., Ildefonse, P., Calas, G., and Brown, G.E., Jr. Amer. Mineral., 91, 1432-1441 (2006).

- Inheritance vs. neoformation of kaolinite during lateritic soil formation: a case study in the middle Amazon. E. BALAN, E. FRITSCH, T. ALLARD, and G.CALAS. Clays Clay Miner., 55, 253-260 (2007).

- Al speciation in tropical podzols of the upper Amazon basin: A solid-state 27 Al MAS and MQMAS NMR study. M. BARDY, C. BONHOMME, E. FRITSCH,        J. MAQUET, R. HAJJAR, T. ALLARD, S. DERENNE, G. CALAS. Geochim. Cosmochim. Acta, 71, 3211-3222 (2007)

- Structure, reactivity and spectroscopic properties of minerals from lateritic soils: Insights from ab initio calculations. E. BALAN, M. LAZZERI, F. MAURI and        G. CALAS. Eur. J. Soil Sci., 58, 870-881 (2007)

- Rapid post mortem incorporation of aluminum in diatom frustules: Evidence from chemical and structural analyses. E. KONING, M. GEHLEN, A.-M. FLANK,         G. CALAS and E. EPPING. Marine Chem., 106, 208-222 (2007)

- Dissolution of radiation-damaged zircon in lateritic soils. S. DELATTRE, S. UTSUNOMIYA, R. C. EWING, J.L. BOEGLIN, J.J. BRAUN, E. BALAN and G. CALAS. Amer. Mineral. 92, 1978–1989 (2007).

- Extended X-ray Absorption Fine Structure Analysis of Arsenite and Arsenate Adsorption on Maghemite. G. MORIN, G. ONA-NGUEMA, Y. WANG, N. MENGUY, F. JUILLOT, O.PROUX, F. GUYOT, G. CALAS and G.E. BROWN Jr.. Environ. Sci.Technol., 42, 2361–2366 (2008).

- Arsenite sorption at the magnetite-water interface during aqueous precipitation of magnetite: EXAFS evidence of a new arsenite surface complex. Y. WANG, G. MORIN, G. ONA-NGUEMA, N. MENGUY, F. JUILLOT, E. AUBRY, F. GUYOT, G. CALAS and G.E. BROWN Jr.. Geochim. Cosmochim. Acta, 72, 2573-2586 (2008)

-  Changes in arsenic speciation through a contaminated soil profile: an XAS based study. B. CANCÈS, F. JUILLOT, G. MORIN, V. LAPERCHE, D.L. POLYA, D.J. VAUGHAN, J.L. HAZEMANN, O. PROUX, G. E. BROWN Jr. and G. CALAS. Sci. Total Env., 397, 178-189 (2008).

- Synchrotron X-ray studies of heavy metal mineral-microbe interactions. G. E. BROWN, JR., Y. WANG, A. GÉLABERT, J. HA, C. CISMASU, G. ONA-NGUEMA, K. BENZERARA, J. MIOT, N. MENGUY, G. MORIN, F. JUILLOT, F. GUYOT, G. CALAS, F. FARGES, T. P. TRAINOR, J. GESCHER, C. CORDOVA, and A. M. SPORMANN. Mineral. Mag., 72, 169 -173 (2008).

- Arsenite sequestration at the surface of nano-Fe(OH)2, ferrous carbonate hydroxide, and green-rust after bioreduction of arsenic-sorbed lepidocrocite by Shewanella putrefaciens. G. ONA-NGUEMA, G. MORIN, Y. WANG, N. MENGUY, F. JUILLOT, L. OLIVI, G. AQUILANTI, M. ABDELMOULA, C. RUBY, J.R. BARGAR, F. GUYOT, G. CALAS and G. E. BROWN, Jr.. Geochim. Cosmochim. Acta, 73, 1359-1381 (2009).

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