Geochemical-hydromechanical couplings during water-serpentinized harzburgite interactions at 20°C and 30 bars
Geochemical-hydromechanical couplings during water-serpentinized harzburgite interactions at 20°C and 30 bars
Interaction of groundwater with the serpentinized harzburgites of the upper mantle plays an important role in the geologic carbon cycle and serpentinization processes. In this study, an intact serpentinized harzburgite with more than 60% lizardite from the Semail ophiolite in Oman was reacted with water at near neutral pH and low PCO2 to observe its dissolution behavior and reaction path within the CaO-MgO-SiO2-CO2-H2O system at 20 °C and 30 bars. In the experiment, mass (i.e. H2O, ions) transfer is by diffusion and the selected temperature and pressure conditions mimic water-rock interactions at the shallow portions of most ultramafic rock hosted aquifers. Equilibrium activity-activity diagrams and thermodynamic data were used to compare the experimentally determined reaction path with the theoretical stability boundaries for minerals involved to investigate the evolution of bulk chemical composition, mineralogy, and water composition. The experiments demonstrated that (i) the water-rock interactions increased the pH of the aqueous phase from 5.9 to 7.5 over a period of 18 weeks; (ii) the dissolution of lizardite, orthopyroxene (enstatite), and clinopyroxene (diopside and augite) increased the concentration of Mg, Ca, and Si in the aqueous phase; (iii) the dissolution was incongruent with respect to Mg and Si, favoring Si release at pH > 6 due to (a) breaking of more reactive cation‑oxygen bonds that is consistent with the stoichiometry of magnesium for proton exchange reaction which favors a surface that is enriched in Mg at basic conditions, and (b) preferential dissolution of clinopyroxene Mg1.30Ca0.52Fe0.06Si2O6; (iv) the aqueous phase was undersaturated with respect to carbonate (e.g. calcite, magnesite, and hydromagnesite) and hydrous (e.g. lizardite, chrysotile, brucite, and talc) minerals; (v) the bulk chemical composition and mineralogy of the intact serpentinized harzburgite matrix did not change; (vi) the thermodynamic data can successfully predict water-intact serpentinized harzburgite behavior if the water chemical composition can be constrained; and (vii) no detectable macroscopic form of damage (e.g. microcracks forming as a result of differential stress fields due to changes in volume during chemical reaction) was observed.
Asem, Pouyan
9dc5f19f-82fa-4403-a955-48ef64682769
Matter, Juerg
abb60c24-b6cb-4d1a-a108-6fc51ee20395
Mitchell, Jennifer T.
de2c3ffc-dd3c-4572-b8ff-84a9f136342d
Neil, Chelsea
a79b228c-d48b-4fa5-971a-6444815315f0
Labuz, Joseph F.
3ddc8ea9-a081-49a1-a39f-695ddbbcdd00
24 September 2024
Asem, Pouyan
9dc5f19f-82fa-4403-a955-48ef64682769
Matter, Juerg
abb60c24-b6cb-4d1a-a108-6fc51ee20395
Mitchell, Jennifer T.
de2c3ffc-dd3c-4572-b8ff-84a9f136342d
Neil, Chelsea
a79b228c-d48b-4fa5-971a-6444815315f0
Labuz, Joseph F.
3ddc8ea9-a081-49a1-a39f-695ddbbcdd00
Asem, Pouyan, Matter, Juerg, Mitchell, Jennifer T., Neil, Chelsea and Labuz, Joseph F.
(2024)
Geochemical-hydromechanical couplings during water-serpentinized harzburgite interactions at 20°C and 30 bars.
Chemical Geology, 670, [122413].
(doi:10.1016/j.chemgeo.2024.122413).
Abstract
Interaction of groundwater with the serpentinized harzburgites of the upper mantle plays an important role in the geologic carbon cycle and serpentinization processes. In this study, an intact serpentinized harzburgite with more than 60% lizardite from the Semail ophiolite in Oman was reacted with water at near neutral pH and low PCO2 to observe its dissolution behavior and reaction path within the CaO-MgO-SiO2-CO2-H2O system at 20 °C and 30 bars. In the experiment, mass (i.e. H2O, ions) transfer is by diffusion and the selected temperature and pressure conditions mimic water-rock interactions at the shallow portions of most ultramafic rock hosted aquifers. Equilibrium activity-activity diagrams and thermodynamic data were used to compare the experimentally determined reaction path with the theoretical stability boundaries for minerals involved to investigate the evolution of bulk chemical composition, mineralogy, and water composition. The experiments demonstrated that (i) the water-rock interactions increased the pH of the aqueous phase from 5.9 to 7.5 over a period of 18 weeks; (ii) the dissolution of lizardite, orthopyroxene (enstatite), and clinopyroxene (diopside and augite) increased the concentration of Mg, Ca, and Si in the aqueous phase; (iii) the dissolution was incongruent with respect to Mg and Si, favoring Si release at pH > 6 due to (a) breaking of more reactive cation‑oxygen bonds that is consistent with the stoichiometry of magnesium for proton exchange reaction which favors a surface that is enriched in Mg at basic conditions, and (b) preferential dissolution of clinopyroxene Mg1.30Ca0.52Fe0.06Si2O6; (iv) the aqueous phase was undersaturated with respect to carbonate (e.g. calcite, magnesite, and hydromagnesite) and hydrous (e.g. lizardite, chrysotile, brucite, and talc) minerals; (v) the bulk chemical composition and mineralogy of the intact serpentinized harzburgite matrix did not change; (vi) the thermodynamic data can successfully predict water-intact serpentinized harzburgite behavior if the water chemical composition can be constrained; and (vii) no detectable macroscopic form of damage (e.g. microcracks forming as a result of differential stress fields due to changes in volume during chemical reaction) was observed.
This record has no associated files available for download.
More information
Accepted/In Press date: 14 September 2024
e-pub ahead of print date: 18 September 2024
Published date: 24 September 2024
Identifiers
Local EPrints ID: 504687
URI: http://eprints.soton.ac.uk/id/eprint/504687
ISSN: 0009-2541
PURE UUID: a87bebab-cffc-4dd0-b15a-140e517610c7
Catalogue record
Date deposited: 17 Sep 2025 17:03
Last modified: 18 Sep 2025 01:46
Export record
Altmetrics
Contributors
Author:
Pouyan Asem
Author:
Jennifer T. Mitchell
Author:
Chelsea Neil
Author:
Joseph F. Labuz
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics