Wigley, M. and Kampman, N. and Chapman, H. J. and Dubacq, B. and Bickle, M. J. (2013) In situ redeposition of trace metals mobilized by CO2-charged brines. Geochemistry Geophysics Geosystems, 14 (5). pp. 1321-1332. ISSN 1525-2027 DOI https://doi.org/10.1002/ggge.20104
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Abstract
Mobilization of contaminants by CO2-charged brines is one concern relating to injection of CO2 as part of carbon capture and storage projects. This study monitors the mobility of trace metals in an exhumed CO2-charged aquifer near the town of Green River, Utah (USA), where CO2-charged brines have bleached red sandstones, and concentrated trace metals at the bleaching reaction front. Mass balance calculations on the trace metal enrichments are used to calculate time-integrated fluid fluxes and show that a significant fraction of the metals mobilized by the CO2-rich brines are redeposited locally. A sequential extraction procedure on metal-enriched samples shows that these metals are incorporated into secondary carbonate and oxide phases which have been shown to grow at the CO2-promoted bleaching reaction front. We argue that while CO2-charged brines are capable of mobilizing trace metals, local metal redeposition implies that the potential for contamination of overlying freshwater aquifers is low.
Item Type: | Article |
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Additional Information: | ©2013. American Geophysical Union. All Rights Reserved. |
Uncontrolled Keywords: | 2013AREP; IA66; Phd |
Subjects: | 02 - Geodynamics, Geophysics and Tectonics |
Divisions: | 02 - Geodynamics, Geophysics and Tectonics |
Journal or Publication Title: | Geochemistry Geophysics Geosystems |
Volume: | 14 |
Page Range: | pp. 1321-1332 |
Identification Number: | https://doi.org/10.1002/ggge.20104 |
Depositing User: | Sarah Humbert |
Date Deposited: | 31 Aug 2013 13:39 |
Last Modified: | 11 Jul 2014 11:42 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/2863 |
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