Sulfur isotope effects in the thermal breakdown of pyrite

Details Sulfur isotope effects in the thermal breakdown of pyrite Sulfur isotope effects in the thermal breakdown of pyrite

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..69..335y&link_type=abstract

Earth and Planetary Science Letters, Volume 69, Issue 2, p. 335-340.

Computer Science

Scientific paper

Pyrite was broken down with excess iron powder in glass tubes at 600° and 450°C. The products were pyrrhotite in the pyrite zone and troilite in the iron powder zone. The accompanying isotope effects were very small. δ34S values for pyrrhotite and troilite were all within +/-0.5‰ of the initial pyrite, and in each run pyrrhotite was somewhat enriched in 34S relative to troilite. The δ34S values for the remaining pyrite were almost identical to those of the initial pyrite until the reaction was 80% complete. Pyrites of the more than 80% reaction were appreciably enriched in 34S, although the maximum enrichment observed was only +2.0‰ for the pyrite of the 99% reaction. Applying a Rayleigh distillation model, we obtained an instantaneous fractionation factor between the product (pyrrhotite plus troilite) and pyrite of only 0.9996.
These results are in striking contrast to the large kinetic isotope effects previously found in the breakdown of pyrite to pyrrhotite and sulfur. The present small isotope effects may be interpreted as indicating that the kinetic isotope effect was significantly reduced by the introduction of iron powder which may have taken an essential part in the mechanism of pyrite breakdown, rather than that isotope equilibration took place among the coexisting sulfide phases.

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