Mass-independent isotope effects in Archean (2.5 to 3.8 Ga) sedimentary sulfides determined by ion microprobe analysis

S. Mojzsis, C. D. Coath, J. P. Greenwood, K. D. McKeegan, T. M. Harrison

Research output: Contribution to journalArticle

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Abstract

We report sulfur isotope anomalies with Δ33S, the deviation from a mass-dependent fractionation line for the three-isotope system (34S/32S vs. 33 S/32S), ranging up to ±2‰ within individual Archean sedimentary sulfides from a variety of localities. Our measurements, which are made in situ by multicollector secondary ion mass spectrometry, unequivocally corroborate prior bulk measurements of mass-independent fractionations (MIF) in sulfur and provide additional evidence for an anoxic atmosphere on the Earth before ∼2 Ga. This technique also offers new opportunities for exploring ancient sulfur metabolisms preserved in the rock record. The presence of MIF sulfur in sulfides from a >3.8-Ga Fe-rich quartzite from Akilia (island), West Greenland, is consistent with a marine sedimentary origin for this rock.

Original languageEnglish
Pages (from-to)1635-1658
Number of pages24
JournalGeochimica et Cosmochimica Acta
Volume67
Issue number9
DOIs
Publication statusPublished - May 1 2003

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ion microprobe
Sulfides
Fractionation
Sulfur
Isotopes
Archean
fractionation
sulfur
sulfide
isotope
Ions
Sulfur Isotopes
Rocks
sulfur isotope
quartzite
Secondary ion mass spectrometry
Metabolism
rock
mass spectrometry
metabolism

ASJC Scopus subject areas

  • Geochemistry and Petrology

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Mass-independent isotope effects in Archean (2.5 to 3.8 Ga) sedimentary sulfides determined by ion microprobe analysis. / Mojzsis, S.; Coath, C. D.; Greenwood, J. P.; McKeegan, K. D.; Harrison, T. M.

In: Geochimica et Cosmochimica Acta, Vol. 67, No. 9, 01.05.2003, p. 1635-1658.

Research output: Contribution to journalArticle

Mojzsis, S. ; Coath, C. D. ; Greenwood, J. P. ; McKeegan, K. D. ; Harrison, T. M. / Mass-independent isotope effects in Archean (2.5 to 3.8 Ga) sedimentary sulfides determined by ion microprobe analysis. In: Geochimica et Cosmochimica Acta. 2003 ; Vol. 67, No. 9. pp. 1635-1658.
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