Investigations of Al-Dalang and Al-Hawashat meteorites

A. M. Gismelseed, S. B. Abdallah, A. D. Al-Rawas, F. N. Al-Mabsali, H. M. Widatallah, M. E. Elzain, A. A. Yousif, T. Ericsson, H. Annersten

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Mössbauer spectroscopy, X-ray diffraction (XRD) measurements, and electron microprobe analysis (EMPA) have been performed on two meteorites named Al-Dalang and Al-Hawashat after identifying their falling sites in the Western region of Sudan. These two meteorites are ordinary chondrites with similar mineralogy. XRD and EMPA show that the two specimens consist of primary olivine, ortho-pyroxene and later crystallising clino-pyroxene as reaction rims against plagioclase. Fe-metal phases are dominated by kamacite (≈6 wt.% Ni) and minor amounts of tetrataenite (≈52 wt.% Ni). Troilite (FeS) and alabandite (MnS) are optically observed as sulphide phases. The Mössbauer measurements at 295 and 78 K are in agreement with the above characterizations, showing at least two paramagnetic doublets which are assigned to olivine and pyroxene and magnetic sextets assigned to kamacite (hyperfine field ≈33.5 T) and troilite FeS (hyperfine field ≈31 T).

Original languageEnglish
Article number14
Pages (from-to)1-7
Number of pages7
JournalHyperfine Interactions
Volume237
Issue number1
DOIs
Publication statusPublished - Dec 1 2016

Keywords

  • Kordofan
  • Meteorite
  • Mössbauer spectroscopy
  • Ordinary chondrites
  • Petrography

ASJC Scopus subject areas

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

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