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Table 2

Relative proportions (%) of each Mössbauer sub-spectrum extracted from analysis of the experimental data collected at room temperature, and Fe3+/Fetot ratios (%) of the serpentine and the bulk powder.

  A1* B2* zone 1 B2* zone 3 B2* (S1’) C1* D1* D1* (S2) E1*
Serpentine Fe2+ 18 16 41 63 22 37 64 25
Serpentine Fe3+ 30 35 41 28 30 36 29 39
Chromite Fe2+ 4 0 5 5 0 6 6 3
Hematite 0 49 13 4 48 0 0 0
Magnetite 28 0 0 0 0 20 0 0
Maghemite 21 0 0 0 0 0 0 23
Goethite 0 0 0 0 0 0 0 9
Fe3+/Fetot serpentine 62.7 50.4 68.2 30.9 58.0 49.3 31.3 61.1
Error (2σ) 14.2 8.0 14.0 5.8 12.4 8.2 5.3 11.0
Fe3+/Fetot bulk 69.2 54.3 83.7 32.3 78.0 49.7 29.3 79.0
Error (2σ) 18.5 13.2 13.6 10.1 13.0 11.0 5.7 22.0

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