著者

Daiki FUKUYAMA Keiji SHINODA Daigo TAKAGI Yasuhiro KOBAYASHI

出版者

Japan Association of Mineralogical Sciences

雑誌

Journal of Mineralogical and Petrological Sciences (ISSN:13456296)

巻号頁・発行日

vol.117, no.1, pp.220506, 2022 (Released:2022-10-18)

参考文献数

21

被引用文献数

2

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The compositional dependence of the intensity and electric field gradient (EFG) tensors for Fe2+ at the M1 sites, Fe2+ at the M2 sites, and Fe3+ at the M1 sites in Ca–rich pyroxene were obtained from Mössbauer spectra of crystallographically oriented single–crystal thin sections of four Ca–rich natural pyroxenes. Components of the intensity tensor (IXX, IYY, IXY, and IZZ) for Fe2+ at the M1 sites in Wo50 Ca–rich pyroxene were almost the same; the averages of the IXX, IYY, IXY, and IZZ components were 0.342, 0.477, 0.039, and 0.681, respectively. Intensity tensor for Fe2+ at the M1 sites of Wo40 Ca–rich pyroxene was different from the Wo50. Whereas principal axes of EFG tensors for Fe2+ at the M1 sites of Wo50 pyroxenes had the same direction, principal axes of VXX and VYY of EFG of Wo40 had different directions from that from Wo50. The difference of intensity and EFG tensors between Wo50 and Wo40 suggests that the intensity and EFG tensors for Fe2+ at M1 sites are dependent on the Ca contents and are independent of Fe contents. Some intensity and EFG tensors for Fe2+ at the M2 sites and Fe3+ at the M1 sites in Ca–rich pyroxene were also obtained. However, the compositional dependence of the intensity and EFG tensors has yet to be clarified, because the number of examples is insufficient.