Jarðefnafræði CO2 í jarðhitavatni - verkefni lokið
Fréttatilkynning verkefnisstjóra
Carbon is one of the most important element in hydrothermal systems present in various oxidation states in secondary minerals, the gas phase and dissolved in water. In order to gain insight into the hydrothermal carbonate geochemistry evidences from natural systems, experiments and geochemical simulations were combined in this study.
Heiti verkefnis: Jarðefnafræði CO2 í jarðhitavatni / The geochemistry of CO2 in hydrothermal waters
Verkefnisstjóri: Andri Stefánsson, Jarðvísindastofnun Háskóla Íslands
Tegund styrks: Verkefnisstyrkur
Strykár: 2011-2013
Fjárhæð styrks: 18,842 millj. kr.
Tilvísunarnúmer Rannís. 110233-02
The major achievement was made in improving geochemical simulations and these applied to understand CO2 chemistry in and the potential for CO2 sequestration into geothermal systems. Doctoral students, postdoctoral and senior scientists in Iceland and France were involved in the project.
Publications related to this project include:
2011
(1) Gysi A.P. and Stefánsson A. (2011) CO2-water-basalt interaction. Numerical simulation and low-temperature CO2 sequestration into basalts. Geochim. Cosmochim. Acta 75, 4728-4751.
(2) Gysi A. and Stefánsson A. (2011) CO2 sequestration and hydrothermal basalt alteration at 40-250°C. Goldschmidt Conference, Prague 2011.
(3) Stefánsson A., Lemke K., Bénézeth P. and Schott J. (2011) The stability and structure of Mg2+ bicarbonate and carbonate ion pairs – an experimental and theoretical study. Goldschmidt Conference, Prague 2011.
(4) Stefánsson A., Lemke K., Bénézeth P. and Schott J. (2011) An experimental and theoretical study of the ion pair formation and solubility in the system Mg-CO2-H2O. AGU fall meeting, San Francisco 2011.
2012
(5) Gysi A.P. and Stefánsson A. (2012) CO2-water-basalt interaction. Low temperature experiments and implications for CO2 sequestration into basalts. Geochim. Cosmochim. Acta 81, 129-152.
(6) Gysi A.P. and Stefánsson A. (2012) Mineralogical aspects of CO2 sequestration during hydrothermal basalt alteration – an experimental study at 75 to 250°C and elevated pCO2. Chem. Geol. 306, 146-159.
(7) Gysi A.P. and Stefánsson A. (2012) Experiments and geochemical modeling of CO2 sequestration during hydrothermal basalt alteration. Chem. Geol. 306, 10-28.
(8) Stefánsson A. (2012) Reaction modeling in geothermal systems. AGU fall meeting, San Francisco 2012.
2013
(9) Stefánsson A., Lemke K., Bénézeth P. and Schott J. (2013) IR specroscopic and quantum chemical study of metal bicarbonate and carbonate intreaction in aqeuous solutions. Min. Mag. 77, 2256.
(10) Bénézeth P., Stefánsson A., Gautier Q. and Schott J. (2013) Mineral solubility and aqueous speciation under hydrothermal conditions to 300 C–the carbonate system as an example. Rev. Min. Geochem. 76, 1-81-133.
(11) Stefánsson A., Bénézeth P. and 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.
(12) Stefánsson A. (2013) Geothermal Fluid Interaction with Mafic Rocks in Porous Media-An Experimental and Reactive Transport Modeling Study. AGU Fall Meeting, San Francisco 2013.
(13) Přikryl J., Stefánsson A. and Sigfússon B. (2013) CO2-olivine interaction in porous media - an experimental study.Min. Mag. 77, 1998.
2014
(14) Stefánsson A., Bénézeth P. and 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.
(15) Přikryl J. and Stefánsson A. (2014) Reaction progress of olivine alteration as a function of time and CO2 supply at 150°C – An experimental study. AGU Fall Meeting, San Francisco 2014.
(16) Přikryl J. and Stefánsson A. (2014) The effects of time and acid supply on olivine alteration – an experimental study. ICC 2014, Reykjavík 2014.
(17) Stefánsson A., Lemke K., Bénézeth P. and Schott J. (2014) Magnesium bicarbonate and carbonate interaction in aqueous solutions traced infrared spectroscopy and molecular simulations. Geochim. Cosmochim. Acta (submitted)