GET > Pages profils > Bénézeth Pascale

Profil de Pascale Bénézeth

Bénézeth Pascale

Email :

Téléphone / phone: +33 (0)5 61 33 25 85

Bureau / office : F025

Institution : CNRS

Statut / status: Chercheur

Adresse professionnelle / address:

Géosciences Environnement Toulouse (GET)
UMR 5563
14 Avenue Edouard Belin
31400 Toulouse

Site perso / personal website :


  • 2008 - Habilitation (HDR),LMTG-CNRS-UMR5563, University Paul Sabatier, Toulouse, France. Dissertation: Experimental studies of fluid-rock interactions
  • 2002 – Qualified for Teaching Assistant position, section 35 (Qualification #: 02235117924)
  • 1994 – Ph.D. (honor),Geochemistry laboratory, University Paul Sabatier, Toulouse, France. Dissertation: Experimental study of gallium speciation and aluminum and gallium complexation with acetate ion in aqueous solution (advisor: Jean-Louis Dandurand, Pr.).Fellowships:Research and Educational Ministry
  • 1991 – M.S.,Environmental Geosciences, Aix-MarseilleIII-ToulouseIII, France. Dissertation: Solubility and complexation of aluminum in solution and in presence of acetate ion at 60 and 90°C. 1990 – “Maitrise”,General Geology, University Paul-Sabatier, France
  • 1989 – “License”,Earth Science, University Paul-Sabatier, France
  • 1988 –  Bachelor,Earth Science, University Paul-Sabatier, France


  • October 2010 - present: CNRS Research Director (DR2):GET-UMR 5563, Toulouse, France
  • October 2004 – 2010: CNRS Research Scientist (CR1):Laboratoire des Mécanismes et Transferts en Géologie, LMTG, UMR 5563, Experimental Geochemistry and Biogeochemistry Group -leader of this group since 2009.
  • June 1998-September 2004:Research Staff Member:Oak Ridge National Laboratory, Geochemistry and Chemistry Groups. Oak Ridge, Tennessee, USA.
  • January 1995-December 1997:Postdoctoral Fellow: Oak Ridge National Laboratory, Aqueous Chemistry and Geochemistry Groups. Oak Ridge, Tennessee, USA.Fellowships:Oak Ridge Institute for Science and Education (ORISE) / Oak Ridge National Laboratory (ORNL), Postdoctoral Program: “Fate of metals in aqueous solutions in natural and industrials systems.
  • September 1991-September 1994:Contractual researcher and Teaching assistantat the University Paul-Sabatier, Toulouse France.


  • Experimental aqueous geochemist (batch reactors and high temperature pH-monitoring cells)
  • Acquisition of thermodynamic and kinetic data on fluids, interfaces and solid-solution interactions: expert in experimental measurements of solubilities of minerals (e.g.,aluminum hydroxide, gallium hydroxide, zinc, nickel oxide, carbonates), complexation of metal ions with organic ligands, dissociation of organic acids, proton adsorption at oxide surfaces, and dissolution/precipitation rates very near equilibrium.
  • Mechanisms and rates of mineralization/biomineralization
  • Geological storage of anthropogenic CO2: Experimental determination of the key parameters controlling carbonates precipitation during CO2 injection
  • Computer applications for speciation and transport modeling


  • From 1995-2004, my research activities at Oak Ridge National Laboratories, (USA) in the Chemical and Geochemical groups, focused mainly on experimental studies of the kinetics and thermodynamics of dissolution of metal oxides and hydroxides in hydrothermal solutions. These studies were supported by the Basic Energy of Science of the Department of Energy (DOE, USA) and the electrical power industry (EPRI, USA).
  • Since October 2004, I have integrated and lead programs on the geological sequestration of CO2(my mean research topic) including:
    • 2005 - French program: RTPG- “PICOREF”
    • 2004-2006 -  French program : ACI « Energie et Conception Durable » (2004-2006)
    • 2005-2008 – co-head of a project funded by the French National Agency for Research (ANR) : ANR-stockage géologique du CO2:Géocarbone-Carbonatation :[Bio]Minéralisation du carbone: de la caractérisation expérimentale à la modélisation,with a consortium of 11 French research institutions (LMTG, Toulouse ; IPGP, Paris ; ICMCB, Bordeaux ; LGIT, Grenoble ; TPHY, Montpellier ; ENSM, Saint Etienne ; ENPC-CERMES, Institut Navier; IFP; GDF; Schlumberger and Total).
    • 2006-2010: “GRASP” (Greenhouse-gas Removal Apprenticeship and Student Program). GRASP is a European Commission Funded Research and Training Network. The main objective of GRASP is to provide a multidisciplinary training platform to build up a group of young researchers able to tackle the GHG storage issues for the next decades. It is dedicated to improving the scientific basis for CO2 sequestration in the subsurface.
    • 2006-2012: “The Hellisheidi, Iceland field scale CO2 injection scale pilot study: CARBFIX”. This research program, exploring the economic possibility of storing CO2 in basalt rocks, is a joint collaboration between LMTG-CNRS, Reyakavik Energy, Columbia University, and The Science Institute of the University of Iceland.
    • December 2008-2012: head of the project:ANR-CO2FIX:In-situ CO2 [bio]-mineralization in mafic and ultramafic context: a combined experimental and numerical approach,with 4 CNRS teams (LMTG, IPGP, Géosciences Montpellier, ICMCB).
    • January 2013-April 2014: head of a group of experts (14) on the feasibility of sequestering CO2 in the mafic and ultramafic rocks of New-Caledonia

The primary goal of these programs is to provide the fundamental basis for predicting the degree to which stable carbonate will precipitate in the subsurface. Current efforts in our Experimental Geochemical and Biogeochemical group at the LMTG in Toulouse focus on: 1) Determining the rates of dissolution of primary silicate and carbonate minerals in the presence and absence of CO2; 2) Developing an improved data base describing the solubility of minerals in the presence of dissolved CO2; 3) Measuring the precipitation rates of carbon-bearing minerals at conditions typical of likely CO2 sequestration sites; 4) Performing CO2 reactive transport experiments in porous carbonates and sandstones at T/P conditions of CO2 storage to validate at the decimetric scale the elementary mechanisms and values of thermodynamic and kinetic parameters that are generated at the microscopic scale; 5) Studying the mechanisms of biomineralization. These studies are performed using state-of-the art equipments including newly constructed high T/P hydrogen electrodes potentiometric cells, batch reactors and low temperature mixed-flow reactors for kinetic studies and externally single-pass plug flow percolation cell associated with microtomography.

  • From 2009-2011: Head of the Experimental Geochemistry and Biogeochemistry group
  • Since January 2011: Head of the theme T7 at the GET: fluids-minerals-microorganisms interactions in natural and CO2 geological sequestration contexts.
  • From 2005-2010: Head of the “Experimental Geochemistry platform” at the LMTG/GET
  • Since 2012: co-head of the "Experimental Geochemistry and Mineralogy platform” at GET
  • Since 2007: Nominated member of the LMTG an GET council
  • Since 2010: member of the INSU-CT5 (CESSUR) committee
  • Since 2013: Nominated member of the Scientific Collège A BEST (Biologie-Ecologie-Sciences de la Terre) at Paul-Sabatier University
  • Since 2015: Nominated expert by the Ministry MENESR in the DS3 domain (Earth Science).

Main/Recent publications

  • Bundeleva I.A., Shirokova L.S., Kompantseva E.I., Bénézeth P., Ménez B. and Pokrovsky O.S.(2015) Experimental modeling of bacterially-induced Ca carbonate precipitation: new insights on possible mechanisms. Key Engineering Materials, 672, 21-39.
  • Loring J.S., Chen J.,Bénézeth P., Qafoku O., Ilton E.S., Washton N.M., Thompson C.J., Martin P.F., McGrail P.B., Rosso K.M., Felmy A.R. and Schaef H.T. (2015) Evidence for carbonate surface complexation during forsterite carbonation in wet supercritical carbon dioxide. Langmuir, 31, 7533-7543.
  • Mavromatis V., Bundeleva I.A., Shirokova L.S., Millo C., Pokrovsky O.S., Bénézeth P., Ader M. and Oelkers E.H.(2015) The continuous re-equilibration of carbon isotope compositions of hydrous Mg carbonates in the presence of cyanobacteria. Chem. Geol., 404, 41-51.
  • Loring J.S., Ilton E.S., Chen J., Thompson C.J., Martin P.F., Bénézeth P., Rosso K.M., Felmy A.R., and Schaef H.T. (2014) In SituStudy of CO2 and H2O Partitioning Between Na-Montmorillonite and Variably Wet Supercritical Carbon Dioxide. Langmuir, 30, 6120-6128.
  • Stefansson A., Bénézeth P., Schott J.,(2014) Potentiometric and spectrophotometric study of the stability of magnesium carbonate and bicarbonate ion pairs to 150°C and aqueous inorganic carbon speciation and magnesite solubility. Geochim. Cosmochim. Acta, 138, 21-31.
  • Thompson C.J., Martin P.F., Chen J., Bénézeth P., Schaef H.T., Rosso K.M., Felmy A.R. and Loring J.S.(2014) Automated high-pressure titration system with in situ infrared spectroscopic detection. Review of Scientific Instruments, 85, 044102, 1-10.
  • Gautier Q., Bénézeth P., Mavromatis V., Schott J.(2014) Hydromagnesite solubility product and growth kinetics in aqueous solutions. Geochim. Cosmochim. Acta, 138, 1-20.
  • Bundeleva I.A., Shirokova L.S., Pokrovsky O.S., Bénézeth P., Ménez B., Gérard E., Balor S.(2014) Experimental modeling of calcium carbonate precipitation by cyanobacteriumGloeocapsasp. Chem. Geol., 374-375, 44-60.
  • Bénézeth P., Stefánsson A., Quentin Gautier and Schott J.(2013) Mineral solubility and aqueous speciation under hydrothermal conditions to 300°C – The carbonate system as an example. In Rev. Min. Geochem, (Eds, Stefánsson Andri, Driesner Thomas,Bénézeth Pascale; ISSN 1529-6466, Mineralogical Society of America, Virginia, Jodi J. Rosso Series Editor), 76, 81-133.
  • Stefánsson A., Driesner T., Bénézeth P. (2013) Thermodynamics of geothermal fluids. In Rev. Min. Geochem (Eds, Stefánsson Andri, Driesner Thomas, Bénézeth Pascale; ISSN 1529-6466, Mineralogical Society of America, Virginia, Jodi J. Rosso Series Editor), 76, 1-4.
  • Shirokova L.S., Mavromatis V., Bundeleva I.A., Pokrovsky O.S., Bénézeth P., Gérard E., Pearce C. and Oelkers E.H.(2013) Using Mg isotopes to trace cyanobacterially mediated magnesium carbonate precipitation in alkaline lakes. Aquat. Geochem., 19, 1-24.
  • Stefánsson A., Bénézeth P., Schott J. (2013) Carbonic acid ionization and the stability of sodium bicarbonate and carbonate ion pairs to 200°C–A potentiometric and spectrophotometric study. Geochim. Cosmochim. Acta, 120, 600-611.
  • Schott J., Oelkers E.H., Bénézeth P., Goddéris Y. and François L.(2012) Can accurate kinetic laws be created to describe chemical weathering? C.R. Geosci., 344, 568-585.
  • Bundeleva I.A., Shirokova L.S., Bénézeth P., Pokrovsky O.S, Kompantseva E.I., Balor S.(2012) Calcium carbonate precipitation by anoxygenic phototrophic bacteria. Chem. Geol., 291, 116-131.
  • Mavromatis V., Pearce C.R., Shirokova L.S., Bundeleva I.A. Pokrovsky O.S., Bénézeth P., Oelkers E.H.(2012) Magnesium isotope fractionation during hydrous magnesium carbonate precipitation with and without cyanobacteria. Geochim. Cosmochim Acta, 76, 161-174.
  • Shirokova L.S., Bénézeth P., Pokrovsky O.S., Gérard E., Ménez B. and Alfredsson H. (2012) Effect of the heterotrophic bacterium Pseudomonas reactanson olivine dissolution kinetics and implications for CO2 storage in basalts. Geochim. Cosmochim Acta, 80, 30-50.
  • Stockmann G.J., Shirokova L.S., Pokrovsky O.S., Bénézeth P., Bovet N., Gislason S.R., Oelkers E.H.(2012) Does the presence of heterotrophic bacteriumPseudomonas reactansaffect basaltic glass dissolution rates? Chem. Geol., 296-297, 1-18.
  • Bénézeth P., Saldi G., Dandurand J.L. and Schott J.(2011) Experimental determination of the solubility product of magnesite at 50 to 200°C. Chem. Geol., 286, 21-31.
  • Oelkers E.H., Golubev S.V., Pokrovsky O.S., and Bénézeth P. (2011) Do organic ligands effect calcite dissolution rates? Geochim. Cosmochim Acta, 75, 1799-1813.
  • Palmer D.A., Bénézeth P., Xiao C., Wesolowski D.J., Anovitz L.M.(2011) Solubility measurements of crystalline NiO in aqueous solution as a function of temperature and pH. J. Sol. Chem.,40, 680-702.
  • Bundeleva I.A., Shirokova L.S., Bénézeth P., Pokrovsky O.S, Kompantseva E.I. (2011) Zeta-potential of anoxygenic phototrophic bacteria and Ca adsorption at the cell surface: Possible implications for cell protection from CaCO3 precipitation in alkaline solutions. J. Coll. & Interface Sci., 360, 100-109.
  • Shirokova L.S., Mavromatis V., Bundeleva I., Pokrovsky O.S., Bénézeth P., Pearce C., Gerard E., Balor S. and Oelkers E.H. (2011) Can Mg isotopes be used to trace cyanobacteria-mediated magnesium carbonate precipitation in alkaline lakes? Biogeosciences Discuss., 8,6473-6517.

Responsable du module:UE6 Piégeage des hydrocarbures et stockage du CO2 au Master Pro Université de Toulouse, M2P Géologie des Ressources Naturelles (GRN) :

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