2024

Schuh-Frantz A.C., Mezzetti A., Setisonen A. P., Nélieu S., Balan E., Morin G., Carrier X. (2024) Investigating Nalidixic Acid Adsorption onto Ferrihydrite and Maghemite Surfaces: Molecular-Level Insights via Continuous-Flow FTIR-ATR Spectroscopy. New Journal of Chemistry (in press) https://doi.org/10.1039/D4NJ03440F

Bourbon E., Averseng F., Le Pape P., Allard T., Baratelli F., Alliot F., Gélabert A., Rollot V., Guigon E., Brest J., Nélieu S., Morin G. (2024) Non-Hydroxyl Radical Species Production during Dark Air Oxidation of Alluvial Soils. ACS Earth and Space Chemistry 8, 1757-1770. https://doi.org/10.1021/acsearthspacechem.4c00113

Bollaert Q.,  Chassé M.,  Morin G., Baptiste B., Courtin A., Galoisy L., Landrot G., Quantin C., Calas G. (2024) Atomic-scale environment of niobium in ore minerals as revealed by XANES and EXAFS at the Nb K-edge. European Journal of Mineralogy 36, 55–72, 2024. https://doi.org/10.5194/ejm-36-55-2024

Thery G., Juillot F., Calmels D., Bollaert Q., Meyer M.,  Quiniou T.,  David M., Jourand M., Ducousso M., Fritsch E., Landrot G., Morin G., Quantin C. (2024) Heating effect on chromium speciation and mobility in Cr-rich soils: A snapshot from New Caledonia. Science of the total Environment 922, 171037.  DOI : 10.1016/j.scitotenv.2024.171037


2023

Juillot F. Noël V., Louvat P., Gelabert A., Jouvin D., Göttlicher J., Belin S., Müller B., Morin G., Voegelin, A. (2023) Can Zn isotopes in sediments record past eutrophication of freshwater lakes? A pilot study at Lake Baldegg (Switzerland). Chemical Geology 620, 121321. DOI : 10.1016/j.chemgeo.2023.121321

Truong C., Bernard S ., Le Pape P., Morin G., Baya C., Merrot P., Gorlas A., Guyot F. (2023) Production of carbon-containing pyrite spherules induced by hyperthermophilic Thermococcales: a biosignature? Frontiers in Microbiology 25 May 2023, DOI : 10.3389/fmicb.2023.1145781

Lefebvre P., Mangeret A., Gourgiotis A., Louvat P., Le Pape P., Sabatier P., Diez O., Cazala C., Gaillardet J., Morin G. (2023) Geochemical Controls on the Uranium Cycle in a Lake Watershed. ACS Earth and Space Chemistry 7, 972-985.

Morin G., Averseng F., Carrier X., Le Pape P., Du Y., HongE Y., Bourbon E., Sportelli G.,  A. Da Silva T., Mezzetti A.,  Baya C.,  Allard T., Brest J.,  Rouelle M. (2023) Phosphate Boosts Nonhydroxyl Radical Species Production upon Air Oxidation of Magnetite and Iron Sulfides at Neutral pH. Journal of Physcical Chemistry C 127, 9650-9662.

Marques K.P.P., Allard T.,  Gautheron C.,  Baptiste B., Pinna-Jamme R., Morin G., Delbes L., Vidal-Torrado P. (2023) Supergene phases from ferruginous duricrusts: non-destructive microsampling and mineralogy prior to (U-Th)/He geochronological analysis. European Journal of Mineralogy 35, 383-395.

2022

Lefebvre P., Le Pape P.,  Mangeret A., Gourgiotis A., Sabatier P., Louvat P., Diez O., Mathon O., Hunault M.O.J.Y., Baya C., Darricau L., Cazala C., Bargar J.R., Gaillardet J., Morin G. (2022) Uranium sorption to organic matter and long-term accumulation in a pristine alpine wetland. Geochimica et Cosmochimica Acta 338, 322-346. https://doi.org/10.1016/j.gca.2022.10.018

Baya C., Le Pape P., Baptiste B., Menguy N., Delbes L., Morand M., Rouelle M., Aubry E., Ona-Nguema G., Noël V., Juillot F., Morin G. (2022) A methodological framework to study the behavior and kinetic influence of V, Mn, Co, Ni, Cu, Zn, As, Se and Mo during pyritization via the polysulfide pathway at ambient temperature. Chemical Geology 613, 121139. https://doi.org/10.1016/j.chemgeo.2022.121139

Seder-Colomina M., Mangeret A., Bauda P., Brest J., Stetten L., Merrot P., Julien A., Diez O., Barker E., Billoir E., Poupin P., Thouvenot A., Cazala C., Morin G. (2022) Influence of microorganisms on uranium release from mining-impacted lake sediments under various oxygenation conditions. Environmental Science: Processes & Impacts 24, 1830. DOI: 10.1039/d2em00104g

Merrot P., Juillot F., Flipo L., Tharaud M., Viollier E., Noël V., Le Pape P., Fernandez J-M., Moreton B., Morin G. (2022) Bioavailability of chromium, nickel, iron and manganese in relation to their speciation in coastal sediments downstream of ultramafic catchments: A case study in New Caledonia. Chemosphere 302, 134643.

Heller B.M., Bressan Riffel S., Allard T., Morin G., Jean-Yves Roig J-Y, Renaud Couëffé R., Aertgeerts G., Derycke A., Ansart C., Pinna-Jamme R., Gautheron C. (2022) Reading the climate signals hidden in bauxite. Geochimica et Cosmochimica Acta 323, 40-73.

Gorlas A., T. Mariotte, L. Morey, C. Truong, S. Bernard, J.-M. Guigner, J. Oberto, F. Baudin, G. Landrot, C. Baya, P. Le Pape, G. Morin, P. Forterre, F. Guyot (2022) Precipitation of greigite and pyrite induced by Thermococcales: an advantage to live in Fe- and S-rich environments? Environmental Microbiology 24, 626-642. https://doi.org/10.1111/1462-2920.15915

2021

Merrot P., Juillot F., Le Pape P., Lefebvre P., Brest J., Kieffer I., Menguy N., Viollier E., Fernandez J-M., Moreton B., Radakovitch O., Morin G. (2021) Comparative Cr and Mn speciation across a shore-to-reef gradient in lagoon sediments downstream of Cr-rich Ferralsols upon ultramafic rocks in New Caledonia. Journal of Geochemical Exploration 229, 106845. Oct 2021. DOI : 10.1016/j.gexplo.2021.106845

Battaglia-Brunet F., Casiot C., Fernandez-Rojo L., Hery M., Le Pape P., Tris H., Morin G., Touzé S., Joulian  C. (2021) Laboratory-Scale Bio-treatment of real arsenic-rich acid mine drainage. Water Air and Soil Pollution  232 (8), 330. DOI : 10.1007/s11270-021-05276-z

Lefebvre P., Sabatier P., Mangeret A., Gourgiotis A., Le Pape P., Develle A-L., Louvat P., Diez O., Reyss J-L., Gaillardet J., Cazala C., Morin G. (2021) Climate-driven fluxes of organic-bound uranium to an alpine lake over the Holocene. Science of the Total Environment 783, 146878. DOI : 10.1016/j.scitotenv.2021.146878

Baya C., Le Pape P., Baptiste B., Brest J., Landrot G., Elkaïm E., Noël V., Blanchard M., Ona-Nguema G., Juillot F., Morin G. (2021) Influence of trace level As or Ni on pyrite formation kinetics at low temperature. Geochimica et Cosmochimica Acta 300, 333-353. DOI :10.1016/j.gca.2021.01.042

Lefebvre P., Gourgiotis A., Mangeret A., Sabatier P., Le Pape P., Diez O., Louvat P., Menguy N., Merrot P., Baya C., Zebracki M., Blanchart P., Malet E., Jézéquel D., Reyss J.L., Bargar J.R., Gaillardet J., Cazala C., Morin G. (2021) Diagenetic formation of uranium-silica polymers in lake sediments over 3,300 years. Proceedings of the National Academy of Sciences of the United States of America 118, e2021844118. DOI: 10.1073/pnas.2021844118
 
2020

Le Pape P., Stetten L., M.O.J.Y. Hunault, Mangeret A., Brest J., Boulliard J-C., Morin G. (2020) HERFD-XANES spectroscopy at the U M4-edge applied to the analysis of U oxidation state in a heavily contaminated wetland soil. Applied Geochemistry 122, 104714. DOI : 10.1016/j.apgeochem.2020.104714 – nov202

Ona-Nguema G, Guerbois D, Pallud C, Brest J, Abdelmoula M, Morin G (2020) Biogenic Fe(II-III) Hydroxycarbonate Green Rust Enhances Nitrate Removal and Decreases Ammonium Selectivity during Heterotrophic Denitrification. Minerals 10, 818. DOI : 10.3390/min10090818

Mangeret A., Reyss J-L., Seder-Colomina M., Stetten L., Morin G., Thouvenot N., Souhaut M., van Beek P. (2020) Early diagenesis of radium 226 and radium 228 in lacustrine sediments influenced by former mining sites. Journal of environmental Radioactivity 222, 196324. DOI : 10.1016/j.jenvrad.2020.106324 – oct 2020

Gourgiotis A., Mangeret A., Manhes G., Blanchart P., Stetten L., Morin G., Le Pape P., Lefebvre P., Le Coz M., Cazala C. (2020) New Insights into Pb Isotope Fingerprinting of U-Mine Material Dissemination in the Environment: Pb Isotopes as a Memory Dissemination Tracer. Environmental Science and Technology  54, 797-806.DOI : 10.1021/acs.est.9b04828 – 10 dec 2019

Stetten L.,  Lefebvre P., Le Pape P., Mangeret A., Blanchart P., Merrot P., Brest J., Julien A., Bargar J., Cazala C., Morin G. (2020) Experimental redox transformations of uranium phosphate minerals and mononuclear species in a contaminated wetland. Journal of Hazardous Materials  384, 121362. DOI : 10.1016/j.jhazmat.2019.121362 – 15 fev 2020

2019

Merrot P., Juillot F., Noël V., Lefebvre P., Brest J., Menguy N., Guigner J.M., Blondeau M., Viollier E., Fernandez J.M., Moreton B., Bargar J.R., Morin G. (2019) Nickel and iron partitioning between clay minerals, Fe-oxides and Fe-sulfides in lagoon sediments from New Caledonia. Science of the Total Environment 689, 1212–1227.  DOI: 10.1016/j.scitotenv.2019.06.274

Zeyen N., Benzerara K., Menguy N., Brest J. Templeton A.S., Webb S.M., Gérard E., Moreira M., López-García P., Tavera R., Morin G. (2019) Fe-bearing phases in modern lacustrine microbialites from Mexico. Geochimica et Cosmochimica Acta,  253, 201-230. DOI: 10.1016/j.gca.2019.03.021

Asta M., Wang Y., Frutschi M., Viacava K., Loreggian L., Le Pape P., Vo P.L., Fernandez A.M., Morin G., Bernier-Latmani R. (2019) Microbially-mediated release of As from Mekong Delta peat sediments. Environmental Science and Technology 53, 10208-10217. DOI: 10.1021/acs.est.9b02887

Fernandez-Rojo L., Casiot C., Laroche E., Tardy V., Bruneel O., Delpoux S., Desoeuvre A., Grapin G., Savignac J., Boisson J., Morin G., Battaglia-Brunet F., Joulian C., Hery M. (2019) A field-pilot for passive bioremediation of As-rich acid mine drainage.  Journal of Environmental Management 232, 910-918. DOI: 10.1016/j.jenvman.2018.11.116

Hajji S., Montes-Hernandez G., Sarret G., Tordo A., Morin G., Ona-Nguema G., Bureau S., Turki T., Mzoughi N. (2019) Arsenite and chromate sequestration onto ferrihydrite, siderite and goethite nanostructured minerals: Isotherms from flow-through reactor experiments and XAS measurements. Journal of Hazardous Materials 362, 358-367.

2018

Stetten L, Blanchart P., Mangeret A., Lefebvre P., Le Pape P., Brest J., Merrot P., Julien A., Proux O., Webb S.M., Bargar J.R., Cazala C., Morin G. (2018) Redox fluctuations and organic complexation govern uranium redistribution from U(IV)-phosphate minerals in a mining-polluted wetland soil, Brittany, France. Environmental Science and Technology 52, 13099-13109. DOI: 10.1021/acs.est.8b03031

Le Pape P., Blanchard M., Juhin A., Rueff J-P., Ducher M., Morin G., Cabaret D. (2018) Local environment of arsenic in sulfide minerals: insight from high-resolution X-Ray spectroscopies and first-principle calculations at the As K-edge. Journal of Analytical Atomic Spectrometry 33, 2070-2082. DOI : 10.1039/C8JA00272J

Fernandez-Rojo L., Casiot C., Tardy V., Laroche E., Le Pape P., Morin G., Joulian C., Battaglia-Brunet F., Braungardt C., Desoeuvre A., Delpoux S., Boisson J., Héry M. (2018) Hydraulic retention time affects bacterial community structure in an As-rich acid mine drainage (AMD) biotreatment process. Applied Microbiology and Biotechnology 102, 9803–9813. DOI : 10.1007/s00253-018-9290-0

Bonnot C.A., Gelabert A., Louvat P., Morin G., Proux O., Benedetti M.F. (2018) Trace metals dynamics under contrasted land uses: contribution of statistical, isotopic, and EXAFS approaches. Environmental Science and Pollution Research 25, 23383-23403. DOI : 10.1007/s11356-016-6901-0

Seder-Colomina M., Mangeret A., Stetten L., Merrot P., Diez O., Julien A., Barker E., Thouvenot A., Bargar J. R., Cazala C.,  Morin G. (2018) Carbonate facilitated mobilization of uranium from lacustrine sediments under anoxic conditions. Environmental Science and Technology 52, 9615-9624x. DOI : 10.1021/acs.est.8b01255

Allard T., Gautheron C., Bressan Riffel S., Balan E., Fernandes Soares B., Pinna-Jammeb R., Deryckeb A., Morin G., Taitson Buenoe G., do Nascimento N. (2018)  Combined dating of goethites and kaolinites from ferruginous duricrusts. Deciphering the Late Neogene erosion history of Central Amazonia. Chemical Geology 479, 136-150. DOI :10.1016/j.chemgeo.2018.01.004

Wang Y., Le Pape P., Morin G., Asta, M., King G., Bartova B., Suvorova E., Frutschi M., Ikogou M., Pham V.H.C., Vo P.L., Herman F., Charlet L., Bernier-Latmani R. (2018) Arsenic speciation in Mekong Delta sediments depends on their depositional environment. Environmental Science and Technology  52, 3431-3439. 10.1021/acs.est.7b05177

Stetten L., Mangeret A., Brest J., Seder-Colomina M., Le Pape P., Ikogou M., Zeyen N., Thouvenot A., Julien A., Alcalde G., Reyss J.L., Bombled B., Rabouille C.,  Olivi L., Proux O., Cazala C., Morin G. (2018) Geochemical control on the reduction of U(VI) to mononuclear U(IV) species in lacustrine sediment. Geochimica et Cosmochimica Acta 222, 171-186. DOI : 10.1016/j.gca.2017.10.026


2017

Morin G., Noël V., Menguy N., Brest J., Baptiste B., Tharaud M., Ona-Nguema G., Ikogou M., Viollier E., Juillot F. (2017) Nickel accelerates pyrite nucleation at ambient temperature. Geochemical Perspectives Letters 5, 6-11.

Noël V., Juillot F., Morin G., Marchand C., Ona-Nguema G., Viollier E., Prevot F., Dublet G., Maillot F., Delbes L., Marakovic G., Bargar J.R., Brown Jr. G.E. (2017) Oxidation of Ni-rich mangrove sediments after isolation from the sea (Dumbea Bay, New Caledonia): Fe and Ni behavior and environmental implications. ACS Earth and Space Chemistry, doi: 10.1021/acsearthspacechem.7b00005 .

Dublet G., Juillot F., Brest J., Noël V., Fritsch E., Proux O., Olivi L., Ploquin F., Morin G. (2017) Vertical changes of the Co and Mn speciation along a lateritic regolith developed on peridotites (New Caledonia). Geochimica et Cosmochimica Acta 217, 1-15.

Le Pape P., Blanchard M., Brest J., Boulliard J.C., Ikogou M., Stetten L., Wang S., Landrot G., Morin G. (2017) Arsenic incorporation in pyrite at ambient temperature at both tetrahedral S-I and octahedral Fe+II sites: evidence from EXAFS-DFT analysis. Environmental Science and Technology 51, 150−158.

Le Pape P., Battaglia-Brunet F., Parmentier M., Joulian C., Gassaud C., Fernandez-Rojo L., Guigner J-M., Ikogou M., Stetten L., Olivi L., Casiot C., Morin G. (2017) Complete removal of arsenic and zinc from a heavily contaminated Acid Mine Drainage via an indigenous SRB consortium. Journal of Hazardous Materials 321, 764-772.

Ikogou M., Ona-Nguema G., Juillot F., Le Pape P., Menguy N., Richeux N., Guigner J.M., Noël V., Brest J., Baptiste B., Morin G. (2017) Long-term sequestration of nickel in mackinawite formed by Desulfovibrio capillatus upon Fe(III)-citrate reduction in the presence of thiosulfate. Applied Geochemistry 80, 143-154.

Fernandez-Rojo L., Héry M., Le Pape P., Braungardt C., Desoeuvre A., Torres E., Tardy V., Resongles E., Laroche E., Delpoux S., Jouliand C., Battaglia-Brunet F., Boisson J., Grapin G., Morin G., Casiot C. (2017) Biological attenuation of arsenic and iron in a continuous flow bioreactor treating acid mine drainage (AMD). Water Research 123, 594-606.

Till, JL, Guyodo, Y, Lagroix, F, Morin, G, Menguy, N, Ona-Nguema, G. Presumed magnetic biosignatures observed in magnetite derived from abiotic reductive alteration of nanogoethite. Comptes Rendus Geoscience 349, 63-70.  


2016

Baumgartner J., Menguy N., Gonzalez T.P., Morin G., Widdrat M., Faivre D. (2016) Elongated magnetite nanoparticle formation from a solid ferrous precursor in a magnetotactic bacterium. Journal of the Royal Society, Interface 13, 20160665.

Resongles E., Le Pape P., Fernandez-Rojo L., Morin G., Delpoux S., Brest J., Guo S. and Casiot C. (2016) Routine determination of inorganic arsenic speciation in precipitates from acid mine drainage using orthophosphoric acid extraction followed by HPLC-ICP-MS. Analytical methods 2016,8, 7420-7426.

Volant A., Héry M., Desoeuvre A., Casiot C., Morin G., Bertin P.N., Bruneel O. (2016) Spatial Distribution of Eukaryotic Communities Using High-Throughput Sequencing Along a Pollution Gradient in the Arsenic-Rich Creek Sediments of Carnoulès Mine, France. Microbial Ecology 72, 608-620.

Bonnot C., Gélabert A., Louvat P., Morin G., Proux O., Benedetti M.F. (2016) Trace metals dynamics under contrasted land uses: contribution of statistical, isotopic and EXAFS approaches. Environmental Science and Pollution Research doi:10.1007/s11356-016-6901-0, pages 1-21.

Othmane G., Allard T., Vercouter T., Morin G., Fayek M., Calas G. (2016) Luminescence of uranium-bearing opals: Origin and use as a pH record. Chemical Geology 423, 1-6.

Miot J., Lu S., Morin G., Adra A., Benzerara K., Küsel K. (2016) Iron mineralogy across the oxycline of a lignite mine lake. Chemical Geology 434, 28-42.

Muehe E.M., Morin G., Scheer L., Le Pape P., Esteve I., Daus B., Kappler A. (2016) Arsenic(V) incorporation in vivianite during microbial reduction of arsenic(V)-bearing biogenic Fe(III) (oxyhydr)oxides. Environmental Science and Technology 50, 2281-2291.

Morin G., Mangeret A., Othmane G., Stetten L., Seder-Colomina M., Brest J., Ona-Nguema G., Bassot S., Courbet C., Guillevic J., Thouvenot A., Mathon O., Proux O., Bargar J.R. (2016) Mononuclear U(IV) complexes and ningyoite as major uranium species in lake sediments. Geochemical Perspectives Letters 2, 95-105.

Adra A., Morin G., Ona-Nguema G., Brest J. (2016) Arsenate and Arsenite Adsorption onto Al-containing ferrihydrites. Implications for Arsenic Immobilization After Neutralization of Acid Mine Drainage. Applied Geochemistry 64, 2-9. doi:10.1016/j.apgeochem.2015.09.015


2015


Seder-Colomina M., Morin G., Brest J., Ona-Nguema G., Gordien N., Pernelle J.J., Banerjee D., Mathon, O., Esposito G., Van Hullebusch E. (2015) Uranium(VI) scavenging by amorphous iron phosphate encrusting Sphaerotilus natans filaments. Environmental Science and Technology 49, 14065–14075. DOI: 10.1021/acs.est.5b03148

Noël V.,  Morin G., Juillot F., Marchand C., Brest J., Bargar J.R., Muñoz M., Marakovic G., Ardo S., Brown Jr. G.E. (2015) Ni cycling in mangrove sediments from New Caledonia. Geochimica et Cosmochimica Acta 169, 82–98.

Ardo S.G., Nelieu S., Ona-Nguema G., Delarue G, Brest J., Elsa P., Morin G. (2015) Oxidative Degradation of Nalidixic Acid by Nano-magnetite via Fe2+/O2-Mediated Reactions. Environmental Science and Technology 49, 4506-4514.

Dublet G., Juillot F., Morin G., Fritsch E.,  Fandeur D., Brown Jr G.E. (2015) Goethite aging explains Ni depletion in upper units of ultramafic lateritic ores from New Caledonia. Geochimica et Cosmochimica Acta 160, 1-15.

Seder-Colomina M., Goubet A., Lacroix S., Morin G., Ona-Nguema G., Esposito G., van Hullebusch E. D., Pernelle J-J.,  (2015) Moderate oxygen depletion as a factor favouring the filamentous growth of Sphaerotilus natans. Antonie van Leeuwenhoek 107, 1135-1144.

Marsac R., Davranche M., Morin G., Takahashi Y., Gruau G., Dia A. (2015) Effect of loading on the nature of the REE-humate complexes as determined by Yb3+ and Sm3+ LIII-edge EXAFS analysis. Chemical Geology 396, 218-227.

Till J.L., Guyodo Y., Lagroix F., Morin G., Ona-Nguema G. (2015) Goethite as a potential source of magnetic nanoparticles in sediments. Geology 43, 75-78.


2014

Wang Y.H., Morin G., Ona-Nguema G., Brown G.E. Jr. (2014) Arsenic(III) and Arsenic(V) Speciation during Transformation of Lepidocrocite to Magnetite. Environmental Science and Technology 48, 14282-14290.

Seder-Colomina M., Morin G., Benzerara K., Ona-Nguema G., Pernelle J-J., Esposito G., van Hullebusch E. D. (2014) Sphaerotilus natans, a neutrophilic iron-related sheath-forming bacterium: perspectives for metal remediation strategies. Geomicrobiology Journal 31, 64-75.

Le Pape P., Quantin C., Morin G., Jouvin D., Kieffer I., Proux O., Ghanbaja J., Ayrault S. (2014) Zinc Speciation in the Suspended Particulate Matter of an Urban River (Orge, France): Influence of Seasonality and Urbanization Gradient. Environmental Science and Technology 48, 11901-11909.

Guerbois G., Ona-Nguema G., Morin G., Abdelmoula M., Laverman A. M., Mouchel J.M, Barthelemy K., Brest J. (2014) Nitrite reduction by biogenic hydroxycarbonate green rust: Evidence for a nitrite green rust as intermediate reaction product. Environmental Science and Technology 48, 4505-4514.

Dublet G., Juillot F., Morin G., Fritsch E., Noel V., Brest J., Brown Jr. G.E. (2014) XAS Evidence for Ni Sequestration by Siderite in a Lateritic Ni-Deposit from New Caledonia American Mineralogist 99, 225-234.

Cosmidis J., Benzerara K., Morin G., Busigny V., Lebeau O, Jezequel D., Noël G., Dublet G., Othmane G. (2014) Biomineralization of iron-phosphates in the water column of Lake Pavin (Massif Central, France). Geochimica et Cosmochimica Acta 126, 78-96.

Noël V., Marchand C., Juillot F., Ona-Nguema G., Viollier E., Marakovic G., Olivi L., Delbes L., Gelebart F., Morin G. (2014) EXAFS analysis of iron cycling in mangrove sediments downstream of a lateritized ultramafic watershed (Vavouto Bay, New Caledonia). Geochimica et Cosmochimica Acta 136, 211-228.

Blanchard M., Balan E., Giura P., Béneut K., Yi H., Morin G., Pinilla C., Lazzeri M., Floris A. (2014) Infrared spectroscopic properties of goethite : anharmonic broadening, long-range electrostatic effects and Al substitution. Physics and Chemistry of Minerals 41, 289-302.

Yi H., Balan E., Gervais C., Ségalen L., Roche D., Person A., Fayon F., Morin G., Babonneau F. (2014) Probing atomic scale transformation of fossil dental enamel using Fourier transform infrared and nuclear magnetic resonance spectroscopy: A case study from the Tugen Hills (Rift Gregory, Kenya). Acta Biomaterialia 10, 3952 -3958.

2013

Adra A., Morin G., Ona-Nguema G., Menguy N., Maillot F., Bruneel O., Casiot C., Lebrun S., Juillot F., Brest J. (2013) Arsenic scavenging by aluminum-substituted ferrihydrites in a circumneutral pH river impacted by acid mine drainage. Environmental Science and Technology 47, 12784-12792.

Baumgartner J., Morin G., Menguy N., Perez Gonzalez T., Widdrat M., Cosmidis J., Faivre D. (2013) Magnetotactic bacteria form magnetite from a phosphate-rich ferric hydroxide via nanometric ferric (oxyhydr)oxide intermediates. Proceedings of the National Academy of Sciences of the United States of America 110, 14883-14888.

Maillot F., Morin G., Juillot F., Bruneel O., Casiot C., Ona-Nguema G., Wang Y., Lebrun S., Aubry E., Vlaic G., Brown Jr. G.E. (2013) Structure and reactivity of As(III)- and As(V)-rich schwertmannites and amorphous ferric arsenate sulfate from the Carnoulès acid mine drainage, France: Comparison with biotic and abiotic model compounds and implications for As remediation. Geochimica et Cosmochimica Acta 104, 310-329.

Othmane G., Allard T., Morin G., Sélo M., Llorens I., Chen H., Bargar J., Fayek M. and Calas G. (2013) Uranium association with iron-bearing phases in mill tailings from Gunnar, Canada.  Environmental Science and Technology  47, 12695-12702.

Othmane G., Allard T., Menguy N., Morin G., Esteve I., Fayek M., Calas G. (2013) Letter: Evidence for nanocrystals of vorlanite, a rare uranate mineral, in the Nopal I low-temperature uranium deposit (Sierra Peña Blanca, Mexico) American Mineralogist 98, 518-521.

Yi H., Balan E., Gervais C., Segalen L., Fayon F., Roche D., Person A., Morin G., Guillaumet M., Blanchard M., Lazzeri M., Babonneau F. (2013) Letter : A carbonate-fluoride defect model for carbonate-rich fluorapatite. American Mineralogist  98, 1066-1069.

2012

Blanchard M., Morin G., Lazzeri M., Balan E., Dabo I. (2012) First-principles simulation of arsenate adsorption on the (1(1)over-bar2) surface of hematite. Geochimica et Cosmochimica Acta 86, 182-195.

Dublet G., Juillot F., Morin G., Fritsch E., Fandeur D., Ona-Nguema G., Brown Jr. G.E. (2012) Ni speciation in a New Caledonian lateritic regolith: A quantitative X-ray absorption spectroscopy investigation. Geochimica et Cosmochimica Acta 95, 119-133.

Volant, A ; Desoeuvre, A ; Casiot, C ; Lauga, B ; Delpoux, S ; Morin, G ; Personne, JC ; Hery, M ; Elbaz-Poulichet, F ; Bertin, PN ; Bruneel, O. (2012) Archaeal diversity: temporal variation in the arsenic-rich creek sediments of Carnoules Mine, France. Extremophiles 16(4), 645-657.

Guyodo Y., Sainctavit P., Arrio M.A., Carvallo C., Penn R.L., Erbs J.J., Forsberg B.S., Morin G., Maillot F., Lagroix F., Bonville P., Wilhelm F., Rogalev A. (2012) X-ray magnetic circular dichroïsm provides strong evidence for tetrahedral iron in ferrihydrite. Geochemistry Geophysics Geosystems 13, Q06Z44.

Priadi C., Le Pape P., Morin G., Ayrault S., Maillot F., Juillot F., Hochreutener R., Llorens I., Testemale D., Proux O., and Brown G.E., Jr. (2012) X-ray absorption fine structure evidence for amorphous zinc sulfide as a major zinc species in suspended matter from the Seine river downstream of Paris, Ile-de-France, France. Environmental
Science & Technology 46, 3712–3720.

Pantke, C., Obst M., Benzerara K., Morin G., Ona-Nguema G., Dippon U., Kappler A. (2012) Green rust formation during Fe(II) oxidation by the nitrate-reducing Acidovorax sp. strain BoFeN1. Environmental Science & Technology, 46, 1439-1446.

2011

Charlet L, Morin G, Rose J, Wang YH, Auffan M, Burnol A, Fernandez-Martinez A (2011) Reactivity at (nano)particle-water interfaces, redox processes, and arsenic transport in the environment. Comptes Rendus Geoscience, 343 (2-3): 123-139.

Maillot F., Morin G., Wang Y., Bonnin D., Ildefonse P., Chaneac C., Calas G. (2011). New insight into the structure of nanocrystalline ferrihydrite : EXAFS evidence for tetrahedrally coordinated iron(III). Geochimica et Cosmochimica Acta 75(10), 2708-2720.

Hohmann C., Morin G., Ona-Nguema G., Guigner J.M., Brown  Jr. G.E., Kappler A. (2011) Molecular-level modes of As binding to Fe(III) (oxyhydr)oxides precipitated by the anaerobic nitrate-reducing Fe(II)-oxidizing Acidovorax sp. strain BoFeN1. Geochimica et Cosmochimica Acta 75(17), 4699-4712.

Wang YH; Morin, G; Ona-Nguema, G; Juillot, F; Calas G; Brown, GE (2011) Distinctive Arsenic(V) Trapping Modes by Magnetite Nanoparticles Induced by Different Sorption Processes. Environmental Science & Technology, 45, 7258-7266.

Juillot F., Maréchal C., Morin G.,  Jouvin D., Cacaly S., Telouk P., Benedetti M., Ildefonse P., Sutton S., Guyot F., Brown Jr. G.E. (2011) Contrasting isotopic signatures between anthropogenic and geogenic Zn and evidence for post-depositional fractionation processes in smelter-impacted soils from Northern France. Geochimica et Cosmochimica Acta 75(9), 2295-2308.

Benzerara, Karim; Miot, Jennyfer; Morin, Guillaume (2011) How some bacteria can oxidize iron in the absence of dioxygen: implications for environmental science and the search of ancient traces of life. Actualite Chimique 356, 102-104.

Benzerara K, Miot J, Morin G, Ona-Nguema G, Skouri-Panet F, Ferard C. (2011) Significance, mechanisms and environmental implications of microbial biomineralization. Comptes Rendus Geoscience, 343 (2-3): 160-167.

Balan E, Fritsch E, Allard T., Morin G, Guillaumet M, Delattre S, Blanchard M, Calas G. (2011) Spectroscopic investigation and theoretical modeling of kaolinite-group minerals and other low-temperature phases. Comptes Rendus Geoscience, 343 (2-3): 177-187.

Balan E., Delattre S., Roche D., Segalen L., Morin G, Guillaumet M. Blanchard M., Lazzeri M., Brouder C., Salje E.K.H. (2011) Line-broadening effects in the powder infrared spectrum of apatite. Physics and Chemistry of Minerals 38(2), 111-122.

Bruneel O., Volant A., Gallien S., Chaumande B., Casiot C., Carapito C., Bardil A., Morin G., Brown G.E., Jr., Personne C.J., Le Paslier D., Schaeffer C., Van Dorsselaer Alain., Bertin P., Elbaz-Poulichet F., Arsene-Ploetze F. (2011) Characterization of the Active Bacterial Community Involved in Natural Attenuation Processes in Arsenic-Rich Creek Sediments. Microbial Ecology 61(4), 793-810.

2010

M. Cotte; M. Auffan; W. Degruyter; I. Fairchild; M. A. Newton; G. Morin; G. Sarret; A. C. Scheinost (2010) Environmental Sciences at the ESRF. Synchrotron Radiation News 23(5), 28-35.

Egal M., Casiot C., Morin G., Elbaz-Poulichet F., Cordier M.A., Bruneel O. (2010) An updated insight into the natural attenuation of As concengtrations in Reigous creek (southern France). Applied Geochemistry 25(12), 1949-1957.

Blanchard M., Morin G., Lazzeri M., Balan E. (2010) First-principles study of the structural and isotopic properties of Al- and OH-bearing hematite. Geochimica et Cosmochimica Acta 74(14), 3948-3962.

Wang Y., Morin G., Ona-Nguema G., Juillot J., Guyot F., Calas G., Brown Jr. G.E. (2010) Evidence for Different Surface Speciation of Arsenite and Arsenate on Green Rust: an EXAFS and XANES study. Environmental Science and Technology  44, 109-115.

Ona-Nguema G. Morin G., Wang Y., Foster. A. Juillot F., Calas G., Brown Jr. G.E. (2010) XANES evidence for rapid Arsenic(III) Oxidation at Magnetite, and Ferrihydrite Surfaces by dissolved O2, via Fe2+-Mediated Reactions. Environmental Science and Technology 44 (14), 5416–5422.

Juhin A., Morin G., Elkaïm E., Frost D. J., Fialin M., Juillot F., Calas G. (2010) Structure refinement of a synthetic knorringite, Mg3(Cr0.8Mg0.1Si0.1)2(SiO4)3. American Mineralogist  95, 59–63.

Hohmann C., Winkler E., Morin G., Kappler A. (2010) Anaerobic Fe(II)-oxidizing bacteria show As resistance and immobilize As during Fe(III) mineral precipitation. Environmental Science and Technology  44, 94-101.

Ruby C, Abdelmoula M, Naille S, Renard A, Khare V, Ona-Nguema G, Morin G, Genin JMR. (2010) Oxidation modes and thermodynamics of FeII-III oxyhydroxycarbonate green rust: Dissolution-precipitation versus in situ deprotonation. Geochimica et Cosmochimica Acta 74(3), 953-966.

2009

Morin G., Wang Y., Ona-Nguema G., Juillot F., Calas G., Menguy M., Aubry E., Bargar J.R., Brown Jr. G.E. (2009) EXAFS and HRTEM Evidence for As(III)-Containing Surface Precipitates on Nanocrystalline Magnetite: Implications for As Sequestration. Langmuir 25, 9119-9128.

Ona-Nguema G., Morin G., Wang Y., Menguy N., Juillot F., Olivi L., Aquilanti G., Abdelmoula M., Ruby C., Bargar J.R., Guyot F., Calas G., Brown JR. G.E. (2009) 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. Geochimica et Cosmochimica Acta 73, 1359-1381.

Miot, J.; Morin, G.; Skouri-Panet, F.; Férard, C.; Poitevin A.; Aubry, E.; Ona-Nguema G..; Juillot F. ; Guyot, F.; Brown, G. E. (2009) Speciation of Arsenic in Euglena gracilis Cells Exposed to As(V). Environmental Science and Technology 43, 3315-3321

Miot, J.; Benzerara K., Morin G., Kappler A., Bernard S., Obst M., Férard C., Skouri-Panet F., Guigner J-M., Posth N., Galvez M., Brown Jr. G.E., Guyot F. (2009) Iron biomineralization by anaerobic neutrophilic iron-oxidizing bacteria. Geochimica et Cosmochimica Acta 73, 696-711.

Miot J., Benzerara K., Morin G., Bernard S., Beyssac O, Larquet E., Kappler A., Guyot F. (2009) Transformation of vivianite by anaerobic nitrate-reducing iron-oxidizing bacteria. Geobiology 7, 373-384.

Miot J, Benzerara K, Obst M, Kappler A, Hegler F, Schädler S, Bouchez C, Guyot F, Morin G. (2009) Extracellular iron biomineralization by photoautotrophic iron-oxidizing bacteria. Appl Environ Microbiol. 75(17), 5586-5591.

Egal M., Casiot C., Morin G., Parmentier M., Bruneel O., Lebrun S., Elbaz-Poulichet F. (2009) Kinetic control on the formation of tooeleite, schwertmannite and jarosite by Acidithiobacillus ferrooxidans strains in an As(III)-rich acid mine water. Chemical Geology 265, 432-441.

Fandeur D, Juillot F, Morin G., Olivi L, Cognigni A., Ambrosi JP, Guyot F., Fritsch E. (2009) Synchrotron-based speciation of chromium in an Oxisol from New Caledonia: Importance of secondary Fe-oxyhydroxides. Amer. Mineral. 94, 710-719.

Fandeur D., Juillot F., Morin G., Olivi L, Cognigni A., Webb S.M., Ambrosi J-P., Fritsch E., Guyot F, Brown Jr. G.E. (2009) XANES evidence for oxidation of Cr(III) to Cr(VI)  by Mn-oxides in a lateritic regolith developed on serpentinized ultramafic rocks of New Caledonia. Environmental Science and Technology  43, 7384–7390.

Lahlil S., Bouquillon A., Morin G., Galoisy L., Lorre C. (2009) Relationship between the coloration and the firing technology used to produce Susa glazed ceramics of the end of the neolithic period. Archaeometry  51,  774-790.

Fakih M., Davranche M., Dia A., Nowack B., Morin G., Petitjean P., Châtellier X., Gruau G.(2009) Environmental impact of As(V)-Fe oxyhydroxide reductive dissolution: An experimental insight. Chemical Geology 259, 290-303.

2008

Juillot F., C. Maréchal, M. Ponthieu, S. Cacaly, G. Morin, M. Benedetti, J.L. Hazemann, O. Proux, F. Guyot. Zn isotopic fractionation caused by sorption on goethite and 2-Lines ferrihydrite. Geochimica et Cosmochimica Acta 72, 4886-4900.

Brown Jr. G.E., Wang, Y., Gelabert A., Ha, J., Cismasu C., Ona-Nguema G., Benzerara K., Miot J., Menguy N., Morin G., Juillot F., Guyot F., Calas G., Farges F., Trainor T., Gescher J., Cordova C., Spormann A.M. (2008) Synchrotron X-ray studies of heavy metal mineral-microbe interactions. Mineralogical Magazine 72, 169-173.

Morin G., Ona-Nguema G., Wang Y. Menguy N., Juillot F., Proux O., Guyot F., Calas G., Brown Jr. G.E. (2008) EXAFS analysis of arsenite and arsenate adsorption on maghemite. Environmental Science and Technology 42, 2361-2366.

Wang Y., Morin G., Ona-Nguema G., Menguy N., Juillot F., Aubry E., Guyot F., Calas G., Brown Jr. G.E.  (2008) Arsenite sorption at the magnetite-water interface during aqueous precipitation of magnetite. EXAFS evidence of a new surface complex. Geochimica et Cosmochimica Acta 72, 2573-2586.

Benzerara K., G. Morin, T.H. Yoon, J. Miot, T. Tyliszczak, C. Casiot, O. Bruneel, F. Farges, G.E. Brown Jr. (2008) Nanoscale study of As biomineralization in an acid mine drainage system. Geochimica et Cosmochimica Acta  72, 3949-3963.

Morin G., Ona-Nguema G., Wang Y. Menguy N., Juillot F., Proux O., Guyot F., Calas G., Brown JR. G.E. (2008) EXAFS analysis of arsenite and arsenate adsorption on maghemite. Environmental Science and Technology 42, 2361-2366.

Cancès B., Juillot F., Morin G., Laperche V., Polya D.,Vaughan D.J., Hazemann J.L., Proux O., Brown Jr. G. E. and Calas G. (2008) Change in arsenic speciation through a contaminated soil profile: a XAS based study. Science of the Total Environment 397, 178-189.

Miot, J.; Morin, G.; Skouri-Panet, F.; Férard, C.; Aubry, E.; Briand, J.; Wang, Y.; Ona-Nguema, G.; Guyot, F.; Brown, G. E. (2008) XAS Study of Arsenic Coordination in Euglena gracilis Exposed to Arsenite. Environ. Sci. Technol.; 2008; ASAP Article;  DOI: 10.1021/es703072d

Lahlil S, Biron I, Galoisy L, Morin G (2008) Rediscovering ancient glass technologies through the examination of opacifier crystals. Applied Physics A-Materials Science & Processing 92, 109-116.

2007

Burnol A., Garrido F., Baranger P., Joulian C., Dictor M-C., Bodenan F., Morin G. and Charlet L.(2007) Decoupling of arsenic and iron release from ferrihydrite suspension under reducing conditions: a biogeochemical model. Geochemical Transactions 8/1 :12, 1-55.

Morin G., Rousse G., Elkaim E. (2007) Crystal structure of tooeleite, a new iron arsenite hydroxysulfate relevant of acid mine drainage. American mineralogist 92, 193-197.

2006

Juillot F., Morin G., Ildefonse P., CalasG., and Brown, Jr. G.E. (2006) EXAFS signature of structural Zn at trace levels in natural and synthetic trioctahedral 2:1 phyllosilicates. American Mineralogist 91,1432-1441.

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

Balan E., Lazzeri M., Morin G., Mauri  F. (2006) First-principles study of the OH stretching modes of gibbsite. American Mineralogist 91, 115-119.

Farges, F., Siewert, R., Brown, G.E., Jr., Guesdon, A., Morin, G. (2006) Structural environment around molybdenum in silicate glasses and melts: Part I. Influence of composition and oxygen fugacity on the local structure of molybdenum. Canadian Mineralogist 44, 731-753.

2005

Cancès B., Juillot F., Morin G., Laperche V., Alvarez L., Proux O., Hazemann J-L, Brown Jr. G.E., Calas G. (2005) XAS evidence of As(V) association with iron oxyhydroxides in a contaminated soil at a former arsenical pesticide processing plant. Environmental Science and Technology 39, 9398-9405.

Ona-Nguema G., Morin G., Juillot F., Brown JR. G.E., Calas G. (2005) EXAFS analysis of Arsenic(III) sorption onto 2-line ferrihydrite, hematite, gœthite, and lepidocrocite under anoxic conditions. Environmental Science and Technology 39, 9147-9155.

Fritsch E., Morin G., Bedidi A., Bonnin D., Balan E., Caquineau S., Calas G. (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). European Journal of Soil Science 56/5, 575-588.

Casiot C., Lebrun S., Morin G., Bruneel O., Personné J.C. and Elbaz-Poulichet F. (2005) Sorption and redox processes controlling arsenic fate and transport in a stream impacted by acid mine drainage.  Science of The Total Environment, 347, 122-130.

Sorieul S., Allard T., Morin G., Boizot B., Calas G. (2005) Native and artificial radiation-induced defects in montmorillonite. An EPR study. Physics and Chemistry of Minerals 32, 1-7.

2004

Barbosa E.M., Varajao A.F.D.C, Yvon J., Allard T., Balan E., Morin G. and Abdelmoula M. (2004). Iron EPR logging as a tool for stratigraphic determinations : Application to Rio Capim kaolin deposit (Brazil). Journal of Mining and Metallurgy 40A (1), 1- 9.

Morin G., Juillot F., Casiot C., Bruneel O., Personné J-C., Elbaz-Poulichet F., Leblanc M., Ildefonse Ph., Calas G. (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. Environmental Science and Technology 37, 1705-1712. pdf

Balan E., Allard T., Boizot B., Morin G. and Muller J.P. (1999) Structural Fe3+ in natural kaolinites : New insights from Electron Paramagnetic Resonance spectra fitting at X and Q-band frequencies. Clays and Clay Minerals 47, 605-616

Allard T., Calas G., Ildefonse Ph., Morin G. and Muller J.P. (1997) Impuretés et défauts dans les minéraux de basse température : des témoins de leur histoire. (Impurities and defects in low temperature mineral components : tracers of their history)., Comptes rendus de l'Academie des Sciences: Sciences de la Terre 325, 1-10.

proceedings

Brown, G.E., Jr., Kendelewicz, T., Trainor, T.P., Tanwar, K.S., Chaka, A.M., Bluhm, H., Starr, D.E., Yamamoto, S., Nilsson, A., Catalano, J.G., Benzerara, K., Yoon, T.H., Morin, G., Ona−Nguema, G., Juillot, F., Cances, B., and Calas, G., (2007) Recent advances in surface, interface, and environmental geochemistry. In: Water−Rock Interaction−12, Proc. 12th Internat. Water−Rock Interaction−12, Proceedings of the 12th International Water−Rock Interaction Conference, Kunming, China (Thomas Bullen and Yanxin Wang, eds.), Taylor & Francis Publishers, London, Vol. 1, pp. 3−11.

Juillot, F., Morin, G., Hazemann, J-L., Proux, O., Belin, S., Briois, V., Brown, G.E., Jr., and Calas, G. (2007) EXAFS signatures of structural Zn at trace levels in layered minerals. Am. Inst. Phys. Conf. Proc., 13th Int. XAFS Conf. 882, 247-249.

Brown, Jr. G.E., A. Nilsson, A.M. Spormann, W. P. Addiego, K. Benzerara, U. Bergmann, H. Bluhm, B. A. Brown, G. Calas, A.M. Chaka, B.R. Constantz, F. Farges, S. E. Fendorf, A.L. Foster, F. Juillot, G. Morin, S.C.B. M, L.G.M. Pettersson, K.M. Rosso, J.J. Rytuba, M. Salmeron, J. Saltzman, M. Toney, T.P. Trainor, and T. Yoon (2006) The Stanford Environmental Molecular Science Institute – A Focus on Chemical and Microbial Processes at Environmental Interfaces.  Geochemical News 128, 7-30.

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 (2005) Environmental Interfaces, Heavy Metals, Microbes, and Plants Applications of XAFS Spectroscopy and Related Synchrotron Radiation Methods to Environmental Science. Proceedings of the XAFS 12 conference, Malmö, Sweden, Physica Scripta, T115, 80-87.

Reiche I., G. Morin, Ch. Brouder, C. Vignaud, M. Menu (2005) The history of a turquoise imitation - odontolite- a combined elemental, structural and spectroscopic study, Proceedings of the 33rd International Symposium on Archaeometry, Amsterdam, 22-26 April 2002, H. Kars and E. Burke Eds., Geoarchaeological and Bioarchaeological Studies  3, 509-513.

Calas G., Allard T., Balan E., Morin G., Sorieul S. (2004) Radiation Induced Defects In Nonradioactive Natural Minerals: Mineralogical And Environmental Significance. Material Research Proceedings Symposium. 792, R2.6.1- 12.

Reiche  I., Vignaud C., Champagnon B., Panczer G., Brouder C., Morin G., Solé A., Charlet L., and Menu M. (2002) From Mastodon ivory to gemstone. ESRF Highlights 2001, 31-32.

Ildefonse Ph. Morin G., Juillot F., Calas G., Samama J.C., Brown Jr. G.E., Chevallier P., Populus P. (1999) Weathering of a Pb-Mineralized sandstone, Ardèche, France: Lead speciation. Proc. 5th Int. Symp. Geochemistry of the Earth’s Surface, Reykjavik/Iceland, 16-20 August 1999, Balkema, 385-388.

Galoisy L, Calas G., Ramos A., Le Grand M., Allard T., Morin G., Fillet C. and Pacaud F. (1998) Evolution of the structure of simulated nuclear glasses with the introduction of noble metals. in "Le verre: recherche scientifique pour un confinement de haute performance", Actes de l'Université d'Eté du CEA/Valrho, p 59-64.

Calas G. et Morin G. (1994) Résonance paramagnétique des ions de métaux de transition, post-transition et lanthanides. In: Spectroscopies de résonances paramagnétiques électroniques: du cristal à l'amorphe, de l'isolant au conducteur, D. Gourier et F. Taulelle, Eds, Proceeding, GALERNE 94, Mt St Odile, 9-14 octobre 94 . pp 48.

Morin G., Ildefonse P., Bonnin D., Bouzat G. (1992) A quantitative Rietveld and Mössbauer analysis of aluminium deposits: example from Guinea. Proceedings of the 7th International symposium on Water-Rock Interaction, Park City, Utah, USA. 13 - 19 july 1992,  2, 167-172.

Research fields

Bio-geo-chemistry of minor (Fe, Mn) and trace elements (As, Pb, Zn) in soils and sediments

      Lead in polluted soils from Nord Pas-de-Calais, France
     
         
                 Arsenic in soils over geochemical anomalies, Echassières, Allier, France

Arsenic sorption on iron oxides as an ultimate sink for arsenic after long term weathering. Changes in arsenic speciation in a soil profile developed on FeAsS and FeAs2 mineralized schists in the Echassières region, Allier, France. Concentrations of As, Cu, and Zn indicate some enrichment relative to the bedrock in the upper part of the saprolite (B and C1 horizons) and a progressive depletion towards surficial A2–A00 horizons. SEM photograph displaying the typical euhedral cubic crystals of pharmacosiderite (Ph) formed after hydrothermal weathering of primary iron–arsenic sulfides minerals. XRD patterns show the progressive disappearance of this crystalline towards the upper part of the saprolite; the main Bragg reflections of muscovite (Mu) and biotite (Bt) are also indicated. Fourier filtered contributions of the second neighbor contributions to the EXAFS spectra  at As K-edge indicate that As is adsorbed on HFO in topsoils horizons. Modified from Morin et al. (2002)

Arsenic in acid mine drainage

The key role of microorganisms in immobilizing arsenic in acid mine drainage. Massive bacterial oxidation of iron and arsenic leads to the formation of spectacular outcrops of arsenic-bearing (up to 20 wt% As) sediments and meter-wide stromatolites (bottom center) at the Carnoulès (Gard, France) acid mine drainage. The proportion of seasonally alternating As(III) and As(V) species associated with ferric oxides can be quantified by XANES spectroscopy (right). SEM  micrograph of winter sediments (top right) shows the close association between Acidithiobacillus ferrooxydans, which oxidizes only Fe(II), and a Fe(III)-arsenite, tooeleite (Morin et al. Amer Mineral 2007). This rare mineral, with a distinctive layer structure (top center) is the main component of the stromatolite (bottom left). from Morin & Calas, Elements (2006)