Cited by 256Paleontology and Stratigraphy of FossilsGeological and Geochemical AnalysisOrigins and Evolution of Life

Multiple sulphur isotopic interpretations of biosynthetic pathways: implications for biological signatures in the sulphur isotope record

Farquhar, James, Johnston, David T., Wing, Boswell A., Habicht, Kirsten S., Canfield, Donald E., Airieau, Sabine, Thiemens, Mark H.·2003·Geobiology

Abstract

Isotopic fractionations produced by biosynthetic processes are the result of networks of individual biochemical reactions that operate at differing efficiencies and with distinct fractionation factors. These reaction networks determine the magnitude and direction of the net isotopic fractionation associated with a given process. Here we examine the ways that biological reaction networks control mass‐dependent isotopic fractionations of multiple sulphur isotopes. We describe how material‐flow through some networks can produce characteristic multiple‐sulphur‐isotope signatures that differ from those produced by their constituent steps and demonstrate that experimental results with Archaeaglobus fulgidus can be evaluated using multiple sulphur isotopes in the context of previously published models for dissimilatory sulphate reduction. Our evaluation of these data is consistent with the interpretation that the dependence of sulphur isotope fractionation on external sulphate concentration is rooted in differences between the forward and reverse ↔ adenosine‐5′‐phosphosulphate (APS) ↔ steps. The framework provided by our analysis has the potential to evaluate the biosynthetic pathways that produce the isotopic fractionations, to isolate the primary sources of isotopic fractionations (sulphate reduction or disproportionation reactions) and to establish criteria to identify the signature of specific sulphur metabolisms in the geological record. The results highlight the new types of information that can be obtained by including measurements of δ 33 S {δ 33 S = [(33 S/32 S)sample/(33 S/32 S)reference − 1]*1000} with measurements of δ 34 S.

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Crossref · 10.1046/j.1472-4669.2003.00007.x

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  • The authors accept ~10−5 PAL as the nominal threshold above which S-MIF is no longer preserved and apply it as a robust tool for tracing the first rise in pO2 to >10−5 PAL.

    “By accepting the original value of ~10−5 PAL as the nominal threshold above which S-MIF is no longer preserved, we apply it here as a robust tool for tracing the first rise in pO2 to >10−5 PAL because of its potential for high stratigraphic resolution (1, 31, 33).”

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Authors
Farquhar, J., Johnston, D. T., Wing, B. A., Habicht, K. S., Canfield, D. E., Airieau, S., & Thiemens, M. H.
Affiliations
  • Earth System Science Interdisciplinary Center (US)
  • University of Southern Denmark (DK)
  • University of California San Diego (US)
Corresponding author
Farquhar, James
Venue
Geobiology
Publisher
Wiley
Published
2003-07
Volume
1
Issue
1
Pages
27-36
ISSN
  • 1472-4669 (ISSN-L)
  • 1472-4677
OpenAlex
W2108421893
Cited by
256
References
39
Citations by year
2026: 9 · 2025: 6 · 2024: 6 · 2023: 9 · 2022: 9 · 2021: 19 · 2020: 14 · 2019: 14 · 2018: 11 · 2017: 18 · 2016: 12 · 2015: 16 · 2014: 15 · 2013: 12 · 2012: 9
FWCI
5.81
Type
journal article
Language
en
Open access
closed
Locations
  • Geobiology (publishedVersion)
  • University of Southern Denmark Research Portal (University of Southern Denmark) (submittedVersion)
Funders
NASA Astrobiology Institute
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Origins and Evolution of Life
Keywords
sulfur isotope fractionation, biosynthetic pathway, mass-dependent fractionation, dissimilatory sulfate reduction, sulfate reduction

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