A sulfur isotope study of pyrite genesis: The mid-proterozoic Newland formation, belt supergroup, Montana

Details A sulfur isotope study of pyrite genesis: The mid-proterozoic Newland formation, belt supergroup, Montana A sulfur isotope study of pyrite genesis: The mid-proterozoic Newland formation, belt supergroup, Montana

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54..197s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 1, pp.197-204

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Scientific paper

Different generations of sedimentary pyrite from the Mid-Proterozoic Newland Formation, USA, have been analysed for their sulfur isotopic compositions. The results indicate bacterial sulfate reduction as the pyrite forming process. The 34 S values for early diagenetic pyrite, around -14%., are in contrast to dominantly more positive values for many other Middle Proterozoic units. A progressive reduction of sulfate availability during diagenesis can be recognized by an increase in 34 S content (Rayleigh Distillation) as well as through detailed petrographic observations. Contemporaneous seawater had a sulfur isotopic ratio between +14 and +18%. as measured from sedimentary barite within the unit.

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