Precise determination of Mg/Fe ratios applicable to terrestrial olivine samples using Raman spectroscopy

Hidemi Ishibashi, Masashi Arakawa, Junji Yamamoto, Hiroyuki Kagi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The relationship between Mg# [ = 100 Mg/(Mg + Fe) in mol] and the Raman shift was analyzed precisely for olivine [(Mg, Fe) 2 SiO 4 ] samples with Mg# between 100 and 62.8. Two prominent peaks at 826-820 cm -1 (peak 1) and 858-849 cm -1 (peak 2) and three subordinate peaks at 883-881 cm -1 (peak 3), 920-914 cm -1 (peak 4), and 967-951 cm -1 (peak 5) were observed to shift monotonously to lower wavenumbers with decreasing Mg#. The ΔMg#(= Mg# ref - Mg#) versus Δν(= ν ref - ν) can be linearly regressed for each peak as ΔMg# = A Δν, where ν is a peak wavenumber of olivine with Mg# ranging from 100 to 62.8, and ν ref is that of olivine with a reference value of Mg#, namely, Mg# ref . We set Mg# ref as 100 (i.e.pure forsterite Mg 2 SiO 4 ) whereas A is a regression parameter (5.789, 4.294, 12.34, 6.348, and 2.09, respectively,for peaks 1, 2, 3, 4, and 5). This equation enables us to avoid small inter-laboratory differences of wavenumber calibration. The equation for peak 2 yields estimations of Mg# in geologically satisfactory precision, ± 1 Mg# (1σ) in the Mg# range of 100-62.8.

Original languageEnglish
Pages (from-to)331-337
Number of pages7
JournalJournal of Raman Spectroscopy
Volume43
Issue number2
DOIs
Publication statusPublished - Feb 1 2012
Externally publishedYes

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Olivine
Raman spectroscopy
Calibration
olivine

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Spectroscopy

Cite this

Precise determination of Mg/Fe ratios applicable to terrestrial olivine samples using Raman spectroscopy. / Ishibashi, Hidemi; Arakawa, Masashi; Yamamoto, Junji; Kagi, Hiroyuki.

In: Journal of Raman Spectroscopy, Vol. 43, No. 2, 01.02.2012, p. 331-337.

Research output: Contribution to journalArticle

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