XAFS imaging of Tsukuba gabbroic rocks: area analysis of chemical composition and local structure

Mizusawa, M.; Sakurai, K.

doi:10.1107/S0909049503028024

Figure 7
(a) Magnitude of the Fourier transform of kχ(k) shown in Fig. 6

. Solid squares and open circles are data from areas A (black part) and B (white part), respectively. The k range used for the Fourier transform is 4.98–12.14 Å⁻¹ and 3.81–11.8 Å⁻¹, respectively. (b) Magnitude of the Fourier transform of kχ(k) given by a FEFF simulation for amphibole (dashed line), olivine (dot-dashed line) and fayalite (solid line). As for the chemical composition of olivine, a 1:1 solid solution of forsterite and fayalite is assumed in the present case. The model is considered by simply replacing 50% of iron with magnesium in fayalite. The k range used for the Fourier transform is 3.54–11.79 Å⁻¹, 4.50–11.70 Å⁻¹ and 4.73–12.16 Å⁻¹ for amphibole, olivine and fayalite, respectively. The scale for amphibole was reduced by 50%. The inset shows the crystal structure of fayalite, which is expected to be close to the mineral in A because of quite a high concentration of iron.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 11| Part 2| February 2004| Pages 209-213

doi:10.1107/S0909049503028024

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