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Multiple sulphur isotopic interpretations of biosynthetic pathways: implications for biological signatures in the sulphur isotope record
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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“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).”
From Rapid oxygenation of Earth’s atmosphere 2.33 billion years ago (2016) · cites this paper as [33]
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Metadata
- 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 › Geochemistry and Petrology › 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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