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Feldspar dissolution kinetics and Gibbs free energy dependence in a CO2-enriched groundwater system, Green River, Utah

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Feldspar dissolution kinetics and Gibbs free energy dependence in a CO2-enriched groundwater system, Green River, Utah. / Kampman, Niko; Bickle, Mike; Becker, John et al.
In: Earth and Planetary Science Letters, Vol. 284, No. 3-4, 15.07.2009, p. 473-488.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Kampman, N, Bickle, M, Becker, J, Assayag, N & Chapman, H 2009, 'Feldspar dissolution kinetics and Gibbs free energy dependence in a CO2-enriched groundwater system, Green River, Utah', Earth and Planetary Science Letters, vol. 284, no. 3-4, pp. 473-488. https://doi.org/10.1016/j.epsl.2009.05.013

APA

Kampman, N., Bickle, M., Becker, J., Assayag, N., & Chapman, H. (2009). Feldspar dissolution kinetics and Gibbs free energy dependence in a CO2-enriched groundwater system, Green River, Utah. Earth and Planetary Science Letters, 284(3-4), 473-488. https://doi.org/10.1016/j.epsl.2009.05.013

Vancouver

Kampman N, Bickle M, Becker J, Assayag N, Chapman H. Feldspar dissolution kinetics and Gibbs free energy dependence in a CO2-enriched groundwater system, Green River, Utah. Earth and Planetary Science Letters. 2009 Jul 15;284(3-4):473-488. doi: 10.1016/j.epsl.2009.05.013

Author

Kampman, Niko ; Bickle, Mike ; Becker, John et al. / Feldspar dissolution kinetics and Gibbs free energy dependence in a CO2-enriched groundwater system, Green River, Utah. In: Earth and Planetary Science Letters. 2009 ; Vol. 284, No. 3-4. pp. 473-488.

Bibtex

@article{fc43dd40d42b47c0a06dcf3acb505503,
title = "Feldspar dissolution kinetics and Gibbs free energy dependence in a CO2-enriched groundwater system, Green River, Utah",
abstract = "Reactions between CO2-charged brines and reservoir minerals might either enhance the long-term storage of CO2 in geological reservoirs or facilitate leakage by corroding cap rocks and fault seals. Modelling the progress of such reactions is frustrated by uncertainties in the absolute mineral surface reaction rates and the significance of other rate limiting steps in natural systems. Here we use the chemical evolution of groundwater from the Jurassic Navajo Sandstone, part of a leaking natural accumulation of CO2 at Green River, Utah, in the Colorado Plateau, USA, to place constraints on the rates and potential controlling mechanisms of the mineral–fluid reactions, under elevated CO2 pressures, in a natural system.The progress of individual reactions, inferred from changes in groundwater chemistry is modelled using mass balance techniques. The mineral reactions are close to stoichiometric with plagioclase and K-feldspar dissolution largely balanced by precipitation of clay minerals and carbonate. Mineral modes, in conjunction with published surface area measurements and flow rates estimated from hydraulic head measurements, are then used to quantify the kinetics of feldspar dissolution. Maximum estimated dissolution rates for plagioclase and K-feldspar are 2 × 10− 14 and 4 × 10− 16 mol m− 2 s− 1, respectively.Fluid ion-activity products are close to equilibrium (e.g. ΔGr for plagioclase between − 2 and − 10 kJ/mol) and lie in the region in which mineral surface reaction rates show a strong dependence on ΔGr. Local variation in ΔGr is attributed to the injection and disassociation of CO2 which initially depresses silicate mineral saturation in the fluid, promoting feldspar dissolution. With progressive flow through the aquifer feldspar hydrolysis reactions consume H+ and liberate solutes to solution which increase mineral saturation in the fluid and rates slow as a consequence.The measured plagioclase dissolution rates at low ΔGr of 2 × 10− 14 mol m− 2 s− 1 would be compatible with far-from-equilibrium rates of ~ 1 × 10− 13 mol m− 2 s− 1 as observed in some experimental studies. This suggests that the discrepancy between field and laboratory reaction rates may in part be explained by the differences in the thermodynamic state of natural and experimental fluids, with field-scale reactions occurring close to equilibrium whereas most laboratory experiments are run far-from-equilibrium.",
keywords = "carbon sequestration, kinetics , feldspar dissolution , Gibbs free energy , Green River , Navajo Sandstone",
author = "Niko Kampman and Mike Bickle and John Becker and Nelly Assayag and Hazel Chapman",
year = "2009",
month = jul,
day = "15",
doi = "10.1016/j.epsl.2009.05.013",
language = "English",
volume = "284",
pages = "473--488",
journal = "Earth and Planetary Science Letters",
issn = "0012-821X",
publisher = "Elsevier Science B.V.",
number = "3-4",

}

RIS

TY - JOUR

T1 - Feldspar dissolution kinetics and Gibbs free energy dependence in a CO2-enriched groundwater system, Green River, Utah

AU - Kampman, Niko

AU - Bickle, Mike

AU - Becker, John

AU - Assayag, Nelly

AU - Chapman, Hazel

PY - 2009/7/15

Y1 - 2009/7/15

N2 - Reactions between CO2-charged brines and reservoir minerals might either enhance the long-term storage of CO2 in geological reservoirs or facilitate leakage by corroding cap rocks and fault seals. Modelling the progress of such reactions is frustrated by uncertainties in the absolute mineral surface reaction rates and the significance of other rate limiting steps in natural systems. Here we use the chemical evolution of groundwater from the Jurassic Navajo Sandstone, part of a leaking natural accumulation of CO2 at Green River, Utah, in the Colorado Plateau, USA, to place constraints on the rates and potential controlling mechanisms of the mineral–fluid reactions, under elevated CO2 pressures, in a natural system.The progress of individual reactions, inferred from changes in groundwater chemistry is modelled using mass balance techniques. The mineral reactions are close to stoichiometric with plagioclase and K-feldspar dissolution largely balanced by precipitation of clay minerals and carbonate. Mineral modes, in conjunction with published surface area measurements and flow rates estimated from hydraulic head measurements, are then used to quantify the kinetics of feldspar dissolution. Maximum estimated dissolution rates for plagioclase and K-feldspar are 2 × 10− 14 and 4 × 10− 16 mol m− 2 s− 1, respectively.Fluid ion-activity products are close to equilibrium (e.g. ΔGr for plagioclase between − 2 and − 10 kJ/mol) and lie in the region in which mineral surface reaction rates show a strong dependence on ΔGr. Local variation in ΔGr is attributed to the injection and disassociation of CO2 which initially depresses silicate mineral saturation in the fluid, promoting feldspar dissolution. With progressive flow through the aquifer feldspar hydrolysis reactions consume H+ and liberate solutes to solution which increase mineral saturation in the fluid and rates slow as a consequence.The measured plagioclase dissolution rates at low ΔGr of 2 × 10− 14 mol m− 2 s− 1 would be compatible with far-from-equilibrium rates of ~ 1 × 10− 13 mol m− 2 s− 1 as observed in some experimental studies. This suggests that the discrepancy between field and laboratory reaction rates may in part be explained by the differences in the thermodynamic state of natural and experimental fluids, with field-scale reactions occurring close to equilibrium whereas most laboratory experiments are run far-from-equilibrium.

AB - Reactions between CO2-charged brines and reservoir minerals might either enhance the long-term storage of CO2 in geological reservoirs or facilitate leakage by corroding cap rocks and fault seals. Modelling the progress of such reactions is frustrated by uncertainties in the absolute mineral surface reaction rates and the significance of other rate limiting steps in natural systems. Here we use the chemical evolution of groundwater from the Jurassic Navajo Sandstone, part of a leaking natural accumulation of CO2 at Green River, Utah, in the Colorado Plateau, USA, to place constraints on the rates and potential controlling mechanisms of the mineral–fluid reactions, under elevated CO2 pressures, in a natural system.The progress of individual reactions, inferred from changes in groundwater chemistry is modelled using mass balance techniques. The mineral reactions are close to stoichiometric with plagioclase and K-feldspar dissolution largely balanced by precipitation of clay minerals and carbonate. Mineral modes, in conjunction with published surface area measurements and flow rates estimated from hydraulic head measurements, are then used to quantify the kinetics of feldspar dissolution. Maximum estimated dissolution rates for plagioclase and K-feldspar are 2 × 10− 14 and 4 × 10− 16 mol m− 2 s− 1, respectively.Fluid ion-activity products are close to equilibrium (e.g. ΔGr for plagioclase between − 2 and − 10 kJ/mol) and lie in the region in which mineral surface reaction rates show a strong dependence on ΔGr. Local variation in ΔGr is attributed to the injection and disassociation of CO2 which initially depresses silicate mineral saturation in the fluid, promoting feldspar dissolution. With progressive flow through the aquifer feldspar hydrolysis reactions consume H+ and liberate solutes to solution which increase mineral saturation in the fluid and rates slow as a consequence.The measured plagioclase dissolution rates at low ΔGr of 2 × 10− 14 mol m− 2 s− 1 would be compatible with far-from-equilibrium rates of ~ 1 × 10− 13 mol m− 2 s− 1 as observed in some experimental studies. This suggests that the discrepancy between field and laboratory reaction rates may in part be explained by the differences in the thermodynamic state of natural and experimental fluids, with field-scale reactions occurring close to equilibrium whereas most laboratory experiments are run far-from-equilibrium.

KW - carbon sequestration

KW - kinetics

KW - feldspar dissolution

KW - Gibbs free energy

KW - Green River

KW - Navajo Sandstone

UR - http://www.scopus.com/inward/record.url?scp=67650566886&partnerID=8YFLogxK

U2 - 10.1016/j.epsl.2009.05.013

DO - 10.1016/j.epsl.2009.05.013

M3 - Journal article

AN - SCOPUS:67650566886

VL - 284

SP - 473

EP - 488

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

SN - 0012-821X

IS - 3-4

ER -