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. 2013 Mar 4;110(12):4506–4511. doi: 10.1073/pnas.1219198110

Fig. 2.

Fig. 2.

(A) Tricolor XRM image grain “3_Jan2010” from P-101 displaying results of principal component analysis based on 58 separate K-edge µ-XANES spectra. Red shows locations where XANES are characteristic of Fe(III) oxides, green areas are characteristic of Fe(II) sulfides, and blue corresponds to Fe-bearing clays. (B) Same color scheme as A, except blue has been reassigned to show U fluorescence. Note that U is colocated with Fe sulfides. (C) Fe K-edge XANES spectra (black) from locations marked A and B in A and B. The red spectrum is ferrihydrite, and the green spectrum is a linear combination of 93% mackinawite and 7% ferrihydrite.