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American Mineralogist; February 2007; v. 92; no. 2-3; p. 424-428; DOI: 10.2138/am.2007.2441
© 2007 Mineralogical Society of America
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Effects of differential recoil-free fraction on ordering and site occupancies in Mössbauer spectroscopy of orthopyroxenes

M. Darby Dyar1,*, Rachel L. Klima2, Donald Lindsley3 and Carlé M. Pieters2

1 Department of Earth and Environment, Mount Holyoke College, South Hadley, Massachusetts 01075 U.S.A.
2 Department of Geological Sciences, Brown University, Providence Rhode Island 02912 U.S.A.
3 Department of Geosciences, State University of New York, Stony Brook, New York 11794-2100, U.S.A.


Figure 1
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  		FIGURE 1. Mössbauer spectra of representative synthetic orthopyroxenes over the solid solution from near-enstatite to ferrosilite. Data points are plotted as error bars representing standard error. Spectra were normalized to 5% absorption effect for clarity.

 

Figure 2
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  		FIGURE 2. Fits to three of the synthetic pyroxenes: Fs100, Fs50En50, and Fs10En90. The outer M1 doublet is shown as a dashed line, while the inner M2 doublet is shown as a solid gray line.

 

Figure 3
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  		FIGURE 3. (top) Results of site occupancy studies of orthopyroxenes equilibrated at 900–1000 °C, including those from this study. The dashed horizontal lines represent the equation formulated by Wang et al. (2005) to relate lnKD to Fs content at these temperatures. The line does not adequately represent the Fe partitioning in samples with higher Fe contents. (bottom) KD values from the current study using M1 and M2 occupancies calculated from a range of C values based on different, arbitrarily selected ratios of recoil-free fraction for the two sites. No choice of value for C will result in a horizontal line of equal KD values.

 




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