Uranium isotopes fingerprint biotic reduction
Open accessAbstract
Knowledge of paleo-redox conditions in the Earth's history provides a window into events that shaped the evolution of life on our planet. The role of microbial activity in paleo-redox processes remains unexplored due to the inability to discriminate biotic from abiotic redox transformations in the rock record. The ability to deconvolute these two processes would provide a means to identify environmental niches in which microbial activity was prevalent at a specific time in paleo-history and to correlate specific biogeochemical events with the corresponding microbial metabolism. Here, we demonstrate that the isotopic signature associated with microbial reduction of hexavalent uranium (U), i.e., the accumulation of the heavy isotope in the U(IV) phase, is readily distinguishable from that generated by abiotic uranium reduction in laboratory experiments. Thus, isotope signatures preserved in the geologic record through the reductive precipitation of uranium may provide the sought-after tool to probe for biotic processes. Because uranium is a common element in the Earth's crust and a wide variety of metabolic groups of microorganisms catalyze the biological reduction of U(VI), this tool is applicable to a multiplicity of geological epochs and terrestrial environments. The findings of this study indicate that biological activity contributed to the formation of many authigenic U deposits, including sandstone U deposits of various ages, as well as modern, Cretaceous, and Archean black shales. Additionally, engineered bioremediation activities also exhibit a biotic signature, suggesting that, although multiple pathways may be involved in the reduction, direct enzymatic reduction contributes substantially to the immobilization of uranium.
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The dissolution process itself causes no U isotope fractionation, but subsequent U(IV) incorporation into secondary calcite phases does cause U isotope fractionation, as may calcite recrystallization under pore water conditions distinct from seawater.
“The dissolution process itself causes no U isotope fractionation (32), but the subsequent U(IV) incorporation into secondary and more stable calcite phases does cause U isotope fractionation (35), as may calcite recrystallization under pore water conditions distinct from seawater (36).”
From Atmosphere-ocean oxygen and productivity dynamics during early animal radiations (2019) · cites this paper as [35]
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Experimental — accuracy not yet measuredU isotopes can potentially track biotic reduction of U(VI), providing a potential novel redox biosignature proxy in the rock record.
“More recent work has also demonstrated that U isotopes can potentially be used to track the biotic reduction of U(VI), providing the potential for a novel redox biosignature proxy in the rock record (Stylo et al., 2015).”
From Trace elements at the intersection of marine biological and geochemical evolution (2016) · cites this paper as Stylo et al., 2015
This utility has profound effects for the evolution of the biosphere and perhaps for tracking the biotic signature of U reduction in the rock record.
“This, in turn, has profound effects for the evolution of the biosphere, and perhaps even for tracking the biotic signature of U reduction in the rock record (Stylo et al., 2015).”
From Trace elements at the intersection of marine biological and geochemical evolution (2016) · cites this paper as Stylo et al., 2015
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- Authors
- Stylo, M., Neubert, N., Wang, Y., Monga, N., Romaniello, S. J., Weyer, S., & Bernier-Latmani, R.
- Affiliations
- École Polytechnique Fédérale de Lausanne (CH)
- Leibniz University Hannover (DE)
- Arizona State University (US)
- Environmental Microbiology Laboratory, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland;
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2015-04-20
- Volume
- 112
- Issue
- 18
- Pages
- 5619-5624
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC4426418
- OpenAlex
- W2151544845
- Cited by
- 166
- References
- 49
- Citations by year
- 2026: 10 · 2025: 13 · 2024: 8 · 2023: 13 · 2022: 17 · 2021: 17 · 2020: 18 · 2019: 19 · 2018: 16 · 2017: 13 · 2016: 17 · 2015: 5
- FWCI
- 12.89
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion)
- Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion, cc-by-nc-nd)
- Funders
- Swiss National Science Foundation (200020-144335)
- National Science Foundation (OCE-0952394)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Physical Sciences › Chemistry › Inorganic Chemistry › Radioactive element chemistry and processing
- Keywords
- uranium isotopes, paleoredox conditions, microbial metabolism, uranium(VI), black shales, bioremediation
- MeSH terms
- Biodegradation, Environmental, Ecology, Microscopy, Electron, Scanning, Oxidation-Reduction, Paleontology, Uranium, Reproducibility of Results, Geologic Sediments, Shewanella, Geological Phenomena, X-Ray Absorption Spectroscopy
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