Quantitative electron microprobe analyses of coexisting sphalerite, daubreelite and troilite in the Odessa iron meteorite and their genetic implications

Details Quantitative electron microprobe analyses of coexisting sphalerite, daubreelite and troilite in the Odessa iron meteorite and their genetic implications Quantitative electron microprobe analyses of coexisting sphalerite, daubreelite and troilite in the Odessa iron meteorite and their genetic implications

Oct 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967gecoa..31.1667e&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 31, Issue 10, pp.1667-1670

Computer Science

2

Scientific paper

Detailed optical studies and quantitative microprobe analyses were carried out on coexisting sphalerites, troilites and daubreelites in several nodules of the Odessa iron meteorite and on sphalerite inclusions in kamacite of the Odessa and Cañon Diablo iron meteorites. The analyses demonstrated that the Odessa sphalerites are ZnS-FeS-MnS mixed crystals with moderately variable FeS and MnS contents. The studied sphalerites are not zoned. Troilite contains traces of chromium and zinc. The coexisting daubreelites display variable chemical compositions with strong fluctuations in their zinc content. Zincian daubreelites described here for the first time do not differ optically from normal zinc-free daubreelites. They do not represent a separate mineral species but are probably (Fe, Mn) Cr 2 S 4 -(Zn, Mn) Cr 2 S 4 mixed crystals. Iron and zinc in these mixed crystals are reciprocal while zinc and manganese are complementary only to a certain extent. The strong variation in the zinc content of these daubreelites indicates that equilibration was not attained at the time when the meteorite formed and hence the minerals present cannot be applied in cosmic thermometry or sulphur barometry.

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