Kinetics of CO2-fluid-rock reactions in a basalt aquifer, Soda Springs, Idaho

Maskell, Alexandra and Kampman, Niko and Chapman, Hazel and Condon, Daniel J. and Bickle, Mike (2015) Kinetics of CO2-fluid-rock reactions in a basalt aquifer, Soda Springs, Idaho. Applied Geochemistry, 61. pp. 272-283. ISSN 0883-2927 DOI 10.1016/j.apgeochem.2015.06.010

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S08832...

Abstract

The dissolution of silicate minerals by CO2-rich fluids and the subsequent precipitation of CO2 as carbonate minerals represent a means of permanently storing anthropogenic CO2 waste products in a solid and secure form. Modelling the progression of these reactions is hindered by our poor understanding of the rates of mineral dissolution–precipitation reactions and mineral surface properties in natural systems. This study evaluates the chemical evolution of groundwater flowing through a basalt aquifer, which forms part of the leaking CO2-charged system of the Blackfoot Volcanic Field in south-eastern Idaho, USA. Reaction progress is modelled using changes in groundwater chemistry by inverse mass balance techniques. The CO2-promoted fluid–mineral reactions include the dissolution of primary plagioclase, orthoclase, pyroxene and gypsum which is balanced by the precipitation of secondary albite, calcite, zeolite, kaolinite and silica. Mineral mole transfers and groundwater flow rates estimated from hydraulic head data are used to determine the kinetics of plagioclase and orthoclase feldspar dissolution. Plagioclase surface area measurements were determined using the evolution of the U-series isotope ratios in the groundwater and are compared to published surface area measurements. Calculated rates of dissolution for plagioclase range from 2.4 × 10−12 to 4.6 × 10−16 mol/m2/s and orthoclase from 2.0 × 10−13 to 6.8 × 10−16 mol/m2/s respectively. These feldspar reaction rates, correlate with the degree of mineral–fluid disequilibrium and are similar to the dissolution rates for these mineral measured in other natural CO2-charged groundwater systems.

Item Type: Article
Additional Information: cml: Shell
Uncontrolled Keywords: 2015AREP; IA69; weekly list
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
02 - Geodynamics, Geophysics and Tectonics
07 - Gold Open Access
Journal or Publication Title: Applied Geochemistry
Volume: 61
Page Range: pp. 272-283
Identification Number: 10.1016/j.apgeochem.2015.06.010
Depositing User: Sarah Humbert
Date Deposited: 06 Jan 2016 12:59
Last Modified: 06 Jan 2016 12:59
URI: http://eprints.esc.cam.ac.uk/id/eprint/3532

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