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Widespread abiotic methane in chromitites.

G Etiope1,2, E Ifandi3, M Nazzari4

  • 1Istituto Nazionale di Geofisica e Vulcanologia, via V. Murata 605, 00143, Roma, Italy. giuseppe.etiope@ingv.it.

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This summary is machine-generated.

Chromitites, rocks rich in chromium and ruthenium, are identified as a significant source of abiotic methane. This finding has implications for understanding life

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Area of Science:

  • Geochemistry
  • Astrobiology
  • Mineralogy

Background:

  • Abiotic methane discoveries in ophiolites and peridotite massifs prompt questions about its origin.
  • Understanding methane genesis is crucial for theories on the origin of life and extraterrestrial methane.

Purpose of the Study:

  • To identify the specific rock types responsible for generating abiotic methane within ophiolites.
  • To investigate the role of specific elements and geological conditions in abiotic methane formation.

Main Methods:

  • Molecular and isotopic analyses of gas released by crushing various mafic and ultramafic rocks.
  • Raman spectroscopy to analyze gas inclusions within rock microstructures.

Main Results:

  • Chromitites, uniquely, contain significant amounts of 13C-enriched methane and heavier hydrocarbons.
  • Methane and hydrocarbons exhibit an inverse isotopic trend, indicative of abiotic origin.
  • Chromium and ruthenium in chromitites are proposed as potential catalysts for methane production via the Sabatier reaction.

Conclusions:

  • Chromitites are identified as potential source rocks for abiotic methane on Earth.
  • The findings suggest chromitites could be a source of abiotic methane on other rocky planets, including Mars.