Computer Science
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997m%26ps...32..373a&link_type=abstract
Meteoritics, vol. 32, pages 373-375
Computer Science
14
Scientific paper
Mossbauer spectroscopy, electron microprobe, and X-ray diffraction (XRD measurements have been carried out for the investigation of a newly fallen Sudanese meteorite named New Halfa. The room temperature Mossbauer spectrum is fitted with three sextets and two doublets. The sextets are assigned to Fe in troilite, kamacite and taenite, and the two doublets to Fe2+ in olivine and pyroxene (no Fe3+ was found). The microprobe trace of Ni concentration across a kamacite-taenite-kamacite area shows a high Ni concentration at the interfaces between kamacite and taenite. From the microprobe analysis, olivine appears to have a constant composition whereas pyroxene has a varying composition. The mole fractions of the iron end members of olivine (fayalite) and pyroxene (ferrosilite) are found to be respectively 23.5 % and 23.2 %. Accordingly the New Halfa meteorite is classified as an ordinary L-type chondrite.
Abdu Yassir A.
Ericsson Tore
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