Cited by 18Paleontology and Stratigraphy of FossilsMethane Hydrates and Related PhenomenaGeochemistry and Elemental Analysis

The hidden role of heterotrophic bacteria in early carbonate diagenesis

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Sánchez-Román, Mónica, Chandra, Viswasanthi, Mulder, Sebastian, Areias, Camila, Reijmer, John, Vahrenkamp, Volker·2025·Scientific Reports

Abstract

Microbial impacts on early carbonate diagenesis, particularly the formation of Mg-carbonates at low temperatures, have long eluded scientists. Our breakthrough laboratory experiments with two species of halophilic aerobic bacteria and marine carbonate grains reveal that these bacteria created a distinctive protodolomite (disordered dolomite) rim around the grains. Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) confirmed the protodolomite formation, while solid-state nuclear magnetic resonance (NMR) revealed bacterial interactions with carboxylated organic matter, such as extracellular polymeric substances (EPS). We observed a significant carbon isotope fractionation (average δ 13 C = 11.3‰) and notable changes in Mg/Ca ratios throughout the experiments. Initial medium δ 13 C was − 18‰, sterile sediments were at 2‰ (n = 12), bacterial-altered sediments were − 6.8‰ (n = 12), and final medium δ 13 C was − 4.7‰. These results highlight the role of bacteria in driving organic carbon sequestration into Mg-rich carbonates and demonstrate the utility of NMR as a tool for detecting microbial biosignatures. This has significant implications for understanding carbonate diagenesis (dissolution and reprecipitation), climate science, and extraterrestrial research.

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  1. [21]Browne, K. M., Golubic, S. & Seong-Joo, L. Shallow marine microbial carbonate deposits. In Microbial Sediments (eds Riding, R. E. & Awramik, S. M.) (Springer, 2000).
  2. [38]Sanchez-Roman, M. et al. Sabkha/salina dolomite preserves the biogeochemical conditions of its depositional paleoenvironment. Geochim. Cosmochim. Acta 356, 66–82 (2023). · DOI · Paper page

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Authors
Sánchez-Román, M., Chandra, V., Mulder, S., Areias, C., Reijmer, J., & Vahrenkamp, V.
Affiliations
  • Saudi Aramco (Saudi Arabia) (SA)
  • University of Groningen (NL)
  • Vrije Universiteit Amsterdam (NL)
  • King Abdullah University of Science and Technology (SA)
Venue
Scientific Reports
Published
2025-01-02
Volume
15
Issue
1
Pages
561-561
ISSN
2045-2322 (ISSN-L)
OpenAlex
W4406015998
Cited by
18
References
78
Citations by year
2026: 8 · 2025: 10
FWCI
12.64
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Institutional Repository of the University of Granada (University of Granada) (submittedVersion, cc-by-nc-nd)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • University of Groningen research database (University of Groningen / Centre for Information Technology) (submittedVersion, cc-by)
  • VU Research Portal (submittedVersion, other-oa)
Funders
  • Nederlandse Organisatie voor Wetenschappelijk Onderzoek
  • King Abdullah University of Science and Technology
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Environmental Science › Environmental Chemistry › Methane Hydrates and Related Phenomena
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
Keywords
heterotrophic bacteria, protodolomite, carbon isotope fractionation, Mg/Ca ratio, extracellular polymeric substances, organic carbon sequestration, microbial biomarkers, microbial carbonate precipitation
MeSH terms
Bacteria, Calcium Carbonate, Carbon Isotopes, Carbonates, Magnesium, Microscopy, Electron, Scanning, Magnetic Resonance Spectroscopy, X-Ray Diffraction, Geologic Sediments, Heterotrophic Processes

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