The location of Mn and Fe in axinite-(Fe) from Nandan, China determined by anomalous X-ray scattering (AXS)

Daitaro Kitahara, Hiroshi Arima, Toru Kawamata, Kazumasa Sugiyama, Takashi Mikouchi

Research output: Contribution to journalArticlepeer-review

Abstract

The distribution of Mn and Fe in axinite-(Fe) from Nandan, China, with the structural formula Ca2(Fe0.565 Mn0.33Mg0.08Ca0.025)(Al1.94Fe0.06)Si4BO15(OH), Z = 2, space group P1, a = 7.1488(4) A, b = 9.1970(4) A, c = 8.9688(3) A, α = 91.708(6)°, β = 98.099(6)°, and γ = 77.201(5)°, was determined by anomalous X-ray scattering measurements at Mn and Fe K-absorption edges. The elemental distribution map of Mn obtained by AXS analysis indicates the residence of Mn at the Y site. Conversely, the elemental map of Fe shows the location of Fe at both the Y and Z1 sites. XANES analysis clarifies the progressive incorporation of Fe3+ with decreasing Al content in axinite-(Fe). These experimental results readily suggest the substitution of Al3+ by Fe3+ at the Z1 site.

Original languageEnglish
Pages (from-to)227-235
Number of pages9
JournalJournal of Mineralogical and Petrological Sciences
Volume115
Issue number3
DOIs
Publication statusPublished - 2020 Jun 1

Keywords

  • Anomalous x-ray scattering
  • Axinite
  • XAFS

ASJC Scopus subject areas

  • Geophysics
  • Geology

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