Reclassification of CK chondrites confirmed by elemental analysis and Fe-Mössbauer spectroscopy

Shiro Kubuki, Jun Iwanuma, Kazuhiko Akiyama, Miki Isa, Naoki Shirai, Mitsuru Ebihara, Tetsuaki Nishida

Research output: Contribution to journalArticle

Abstract

Twenty CK chondrites collected in the Antarctica Continent were characterized by inductively-coupled plasma mass spectrometry (ICP-MS), prompt gamma ray analysis (PGA), instrumental neutron activation analysis (INAA), X-ray diffractometry (XRD) and 57Fe-Mössbauer spectroscopy. As a result of elemental analysis, it was revealed that 18.2~26.4 mass% of iron was included in the each chondrite. Mössbauer spectrum of LEW86258, classified as a typical CK chondrite, was found to be composed of two paramagnetic doublets and two magnetic sextets. Mössbauer spectra were assigned to the absorption due to forsterite (Mg 1.36Fe 0.64SiO 4) and magnetite (Fe 3O 4), as also confirmed by XRD. XRD study of LAP03834, reclassified from CK to R chondrite, revealed the presence of crystalline phase due to forsterite. These results indicate that LAP03834 and related chondrites, i. e., MET01149, LAP03923 and MAC02453, should be reclassified as R or LL chondrite.

Original languageEnglish
Pages (from-to)75-78
Number of pages4
JournalHyperfine Interactions
Volume208
Issue number1-3
DOIs
Publication statusPublished - 2012 Mar 1

Keywords

  • CK Chondrite
  • Fe-Mössbauer spectroscopy
  • X-ray diffractometry

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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