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Ductile deformation during carbonation of serpentinized peridotite.
- Source :
- Nature Communications; 6/16/2022, Vol. 13 Issue 1, p1-13, 13p
- Publication Year :
- 2022
-
Abstract
- Carbonated serpentinites (listvenites) in the Samail Ophiolite, Oman, record mineralization of 1–2 Gt of CO<subscript>2</subscript>, but the mechanisms providing permeability for continued reactive fluid flow are unclear. Based on samples of the Oman Drilling Project, here we show that listvenites with a penetrative foliation have abundant microstructures indicating that the carbonation reaction occurred during deformation. Folded magnesite veins mark the onset of carbonation, followed by deformation during carbonate growth. Undeformed magnesite and quartz overgrowths indicate that deformation stopped before the reaction was completed. We propose deformation by dilatant granular flow and dissolution-precipitation assisted the reaction, while deformation in turn was localized in the weak reacting mass. Lithostatic pore pressures promoted this process, creating dilatant porosity for CO<subscript>2</subscript> transport and solid volume increase. This feedback mechanism may be common in serpentinite-bearing fault zones and the mantle wedge overlying subduction zones, allowing massive carbonation of mantle rocks. Mantle rocks can efficiently bind carbon by reaction with CO<subscript>2</subscript> if fluid pathways remain open. This study of samples from Oman demonstrates that coupling of synchronous reaction and deformation facilitates fluid flow and massive carbon sequestration. [ABSTRACT FROM AUTHOR]
- Subjects :
- CARBONATION (Chemistry)
PERIDOTITE
GRANULAR flow
FLUID flow
REACTIVE flow
Subjects
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 13
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 157505430
- Full Text :
- https://doi.org/10.1038/s41467-022-31049-1