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Multi-scale magnetic mapping of serpentinite carbonation

Author

Listed:
  • Masako Tominaga

    (Texas A&M University)

  • Andreas Beinlich

    (Curtin University
    The University of British Columbia
    University of Oslo)

  • Eduardo A. Lima

    (Massachusetts Institute of Technology)

  • Maurice A. Tivey

    (Woods Hole Oceanographic Institution)

  • Brian A. Hampton

    (New Mexico State University)

  • Benjamin Weiss

    (Massachusetts Institute of Technology)

  • Yumiko Harigane

    (The National Institute of Advanced Industrial Science and Technology)

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 field scale processes remains challenging. Here we present the first 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 final 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 situ ultramafic rock carbonation in space and time.

Suggested Citation

  • Masako Tominaga & Andreas Beinlich & Eduardo A. Lima & Maurice A. Tivey & Brian A. Hampton & Benjamin Weiss & Yumiko Harigane, 2017. "Multi-scale magnetic mapping of serpentinite carbonation," Nature Communications, Nature, vol. 8(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01610-4
    DOI: 10.1038/s41467-017-01610-4
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