Cited by 8Paleontology and Stratigraphy of FossilsHydrocarbon exploration and reservoir analysisGeochemistry and Elemental Analysis

Methanogen-mediated dolomite precipitation in an early Permian lake in northwestern China

Sun, Funing, Hu, Wenxuan, Wang, Xiaolin, Hu, Zhongya, Wu, Haiguang, Guo, Yangrui, Wei, Gangjian·2024·Geological Society of America Bulletin

Published version of a preprint

Abstract

Microbes are known to mediate dolomite precipitation in laboratory experiments; however, the linkage of specific microbes to ancient dolomites remains poorly constrained due to scarce diagnostic biogeochemical signatures and mineralized microbial relics in the rock record. Here, we report the occurrence of methanogen-mediated dolomite in the Lower Permian lacustrine Lucaogou Formation in northwestern China. The clumped isotope (Δ47) temperature provides direct evidence of a low-temperature origin (typically <40 °C). The extremely positive δ26MgDSM3 (up to +0.44‰) and δ13CVPDB (up to +19‰) values in the dolomite indicate authigenic precipitation in methanogenic lake sediments. Micron-sized spheroidal bodies and filamentous and sheetlike structures are interpreted as mineralized coccoid methanogenic archaea and extracellular polymeric substances (EPSs), respectively. Dolomite nanoglobules (primarily 40–100 nm in diameter) are interpreted as mineralized viruses attached to the archaea and EPSs and between the cells. A combination of geochemical and microscale evidence confirms the microbial origin of the dolomite induced by methanogens and their associated bacteriophages. Furthermore, dolomite nanoglobules initially nucleated on the surfaces of methanogen cells, EPSs, and viruses and then merged into larger aggregates. The formation of microbial dolomite is characterized by a metabolic incubation, heterogeneous nucleation, and aggregative growth pathway. These findings provide valuable clues to decipher the biosignatures of these particular ancient dolomites.

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Authors
Sun, F., Hu, W., Wang, X., Hu, Z., Wu, H., Guo, Y., & Wei, G.
Affiliations
  • China University of Geosciences (CN)
  • Nanjing University (CN)
  • Northeast Petroleum University (CN)
  • Chinese Academy of Sciences (CN)
Venue
Geological Society of America Bulletin
Published
2023-11-01
Volume
136
Issue
7-8
Pages
2637-2645
ISSN
  • 0016-7606 (ISSN-L)
  • 1943-2674
OpenAlex
W4388125671
Cited by
8
References
73
Citations by year
2026: 2 · 2025: 2 · 2024: 4
FWCI
1.62
Type
journal article
Language
en
Open access
closed
Locations
Geological Society of America Bulletin (publishedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Engineering › Mechanics of Materials › Hydrocarbon exploration and reservoir analysis
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
Keywords
methanogenic archaea, extracellular polymeric substances, bacteriophages, authigenic dolomite, magnesium isotopes, carbon isotopes, heterogeneous nucleation, Lucaogou Formation

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