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

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

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

168 Citations (Scopus)

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.

Translated title of the contributionMass-independent isotope effects in Archean (2.5 to 3.8 Ga) sedimentary sulfides determined by ion microprobe analysis
Original languageEnglish
Pages (from-to)1635-1658
Number of pages24
JournalGeochimica et Cosmochimica Acta
Volume67
Issue number9
DOIs
Publication statusPublished - May 2003

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