Multi-scale magnetic mapping of serpentinite carbonation
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s41467-017-01610-4.pdf
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Author(s)
Tominaga, Masako
Beinlich, Andreas
Tivey, Maurice A.
Hampton, Brian A.
Harigane, Yumiko
Lima, Eduardo A.
Weiss, Benjamin P.
Date Issued
November 2017
Journal
Nature Communications
Publisher
Springer Nature
Citation
Tominaga, Masako, Andreas Beinlich, Eduardo A. Lima, Maurice A. Tivey, Brian A. Hampton, Benjamin Weiss, and Yumiko Harigane. “Multi-Scale Magnetic Mapping of Serpentinite Carbonation.” Nature Communications 8, no. 1 (November 30, 2017).
Version
Final published version
Abstract
Peridotite carbonation represents a critical step within the long-term carbon cycle by sequestering volatile CO₂ in solid carbonate. This has been proposed as one potential pathway to mitigate the effects of greenhouse gas release. Most of our current understanding of reaction mechanisms is based on hand specimen and laboratory-scale analyses. Linking laboratory-scale observations to fi eld scale processes remains challenging. Here we present the fi rst geophysical characterization of serpentinite carbonation across scales ranging from km to sub-mm by combining aeromagnetic observations, outcrop- and thin section-scale magnetic mapping. At all scales, magnetic anomalies coherently change across reaction fronts separating assemblages indicative of incipient, intermittent, and fi nal reaction progress. The abundance of magnetic minerals correlates with reaction progress, causing amplitude and wavelength variations in associated magnetic anomalies. This correlation represents a foundation for characterizing the extent and degree of in sity ultramafic rock carbonation in space and time.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1038/S41467-017-01610-4
