In situ carbonation of peridotite for CO2 storage


Kelemen, Peter B. and Matter, Jürg (2008) In situ carbonation of peridotite for CO2 storage Proceedings of the National Academy of Sciences, 105, (45), pp. 17295-17300. (doi:10.1073/pnas.0805794105).

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Description/Abstract

The rate of natural carbonation of tectonically exposed mantle peridotite during weathering and low-temperature alteration can be enhanced to develop a significant sink for atmospheric CO2. Natural carbonation of peridotite in the Samail ophiolite, an uplifted slice of oceanic crust and upper mantle in the Sultanate of Oman, is surprisingly rapid. Carbonate veins in mantle peridotite in Oman have an average 14C age of ?26,000 years, and are not 30–95 million years old as previously believed. These data and reconnaissance mapping show that ?104 to 105 tons per year of atmospheric CO2 are converted to solid carbonate minerals via peridotite weathering in Oman. Peridotite carbonation can be accelerated via drilling, hydraulic fracture, input of purified CO2 at elevated pressure, and, in particular, increased temperature at depth. After an initial heating step, CO2 pumped at 25 or 30 °C can be heated by exothermic carbonation reactions that sustain high temperature and rapid reaction rates at depth with little expenditure of energy. In situ carbonation of peridotite could consume >1 billion tons of CO2 per year in Oman alone, affording a low-cost, safe, and permanent method to capture and store atmospheric CO2.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1073/pnas.0805794105
ISSNs: 0027-8424 (print)
Keywords: alteration and weathering, carbon capture, exothermic, carbon sequestration, mineral
Subjects: Q Science > QE Geology
Organisations: Ocean and Earth Science
ePrint ID: 349454
Date :
Date Event
3 November 2008e-pub ahead of print
11 November 2008Published
Date Deposited: 05 Mar 2013 11:32
Last Modified: 21 Feb 2017 14:44
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/349454

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