Cited by 96Planetary Science and ExplorationSpace Science and Extraterrestrial LifeAstro and Planetary Science

Abiotic Production of Methane in Terrestrial Planets

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Guzmán-Marmolejo, Andrés, Segura, Antígona, Escobar-Briones, Elva·2013·Astrobiology

Abstract

On Earth, methane is produced mainly by life, and it has been proposed that, under certain conditions, methane detected in an exoplanetary spectrum may be considered a biosignature. Here, we estimate how much methane may be produced in hydrothermal vent systems by serpentinization, its main geological source, using the kinetic properties of the main reactions involved in methane production by serpentinization. Hydrogen production by serpentinization was calculated as a function of the available FeO in the crust, given the current spreading rates. Carbon dioxide is the limiting reactant for methane formation because it is highly depleted in aqueous form in hydrothermal vent systems. We estimated maximum CH4 surface fluxes of 6.8×10(8) and 1.3×10(9) molecules cm(-2) s(-1) for rocky planets with 1 and 5 M⊕, respectively. Using a 1-D photochemical model, we simulated atmospheres with volume mixing ratios of 0.03 and 0.1 CO2 to calculate atmospheric methane concentrations for the maximum production of this compound by serpentinization. The resulting abundances were 2.5 and 2.1 ppmv for 1 M⊕ planets and 4.1 and 3.7 ppmv for 5 M⊕ planets. Therefore, low atmospheric concentrations of methane may be produced by serpentinization. For habitable planets around Sun-like stars with N2-CO2 atmospheres, methane concentrations larger than 10 ppmv may indicate the presence of life.

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Crossref · 10.1089/ast.2012.0817

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Authors
Guzmán-Marmolejo, A., Segura, A., & Escobar-Briones, E.
Affiliations
  • Instituto de Geofísica (MX)
  • NASA Astrobiology Institute (US)
  • Instituto de Ciencias del Mar y Limnología (MX)
Corresponding author
Segura, Antígona
Venue
Astrobiology
Published
2013-06
Volume
13
Issue
6
Pages
550-559
ISSN
  • 1531-1074 (ISSN-L)
  • 1557-8070
OpenAlex
W2072484395
Cited by
96
References
66
Citations by year
2026: 1 · 2025: 12 · 2024: 8 · 2023: 8 · 2022: 6 · 2021: 5 · 2020: 8 · 2019: 2 · 2018: 32 · 2017: 9 · 2016: 2 · 2015: 2
FWCI
0.72
Type
journal article
Language
en
Open access
Locations
  • Astrobiology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Aeronautics and Space Administration (NNH05ZDA001C)
  • NASA Astrobiology Institute
  • Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Planetary Science and Exploration
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Space Science and Extraterrestrial Life
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
Keywords
serpentinization, hydrothermal vents, biosignatures, exoplanet atmospheres, photochemical modeling, habitability
MeSH terms
Methane, Models, Theoretical, Planets

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