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Carbon sequestration via enhanced weathering of peridotites and basalts in seawater

Rigopoulos, I; Harrison, AL; Delimitis, A; Ioannou, I; Efstathiou, AM; Kyratsi, T; Oelkers, EH; (2018) Carbon sequestration via enhanced weathering of peridotites and basalts in seawater. Applied Geochemistry , 91 pp. 197-207. 10.1016/j.apgeochem.2017.11.001. Green open access

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Abstract

Enhanced weathering of mafic and ultramafic rocks has been suggested as a carbon sequestration strategy for the mitigation of climate change. This study was designed to assess the potential drawdown of CO 2 directly from the atmosphere by the enhanced weathering of peridotites and basalts in seawater. Pulverized, and ball milled dunite, harzburgite and olivine basalt were reacted in artificial seawater in batch reactor systems open to the atmosphere for two months. The results demonstrate that the ball-milled dunite and harzburgite changed dramatically the chemical composition of the seawater within a few hours, inducing CO 2 drawdown directly from the atmosphere and ultimately the precipitation of aragonite. In contrast, pulverized but unmilled rocks, and the ball-milled basalt, did not yield any significant changes in seawater composition during the two-month experiments. As much as 10 wt percent aragonite was precipitated during the experiment containing the finest-grained dunite. These results demonstrate that ball milling can substantially enhance the weathering rate of peridotites in marine environments, promoting the permanent storage of CO 2 as environmentally benign carbonate minerals through enhanced weathering. The precipitation of Mg-silicate clay minerals, however, could reduce the efficiency of this carbon sequestration approach over longer timescales.

Type: Article
Title: Carbon sequestration via enhanced weathering of peridotites and basalts in seawater
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.apgeochem.2017.11.001
Publisher version: https://doi.org/10.1016/j.apgeochem.2017.11.001
Language: English
Additional information: © 2017 Elsevier Ltd. This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Enhanced weathering; Basalts; Peridotites; Carbon capture and storage (CCS); Mineral carbonation; Clay minerals
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10037881
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