Nitrogen Isotopic Composition and Density of the Archean Atmosphere
Bernard MartyCentre de Recherches Pétrographiques et Géochimiques–CNRS, Université de Lorraine, 15 rue Notre Dame des Pauvres, 54501 Vandoeuvre-lès-Nancy Cedex, FranceLaurent ZimmermannCentre de Recherches Pétrographiques et Géochimiques–CNRS, Université de Lorraine, 15 rue Notre Dame des Pauvres, 54501 Vandoeuvre-lès-Nancy Cedex, FranceMagali PujolCentre de Recherches Pétrographiques et Géochimiques–CNRS, Université de Lorraine, 15 rue Notre Dame des Pauvres, 54501 Vandoeuvre-lès-Nancy Cedex, FranceR. BurgessSchool of Earth, Atmospheric and Environmental Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UKPascal PhilippotInstitut de Physique du Globe de Paris, Sorbonne-Paris Cité, Université Paris Diderot, CNRS, 1 rue Jussieu, 75238 Paris Cedex 5, France
2013en
ABI
Аннотация
Understanding the atmosphere's composition during the Archean eon is fundamental to unraveling ancient environmental conditions. We show from the analysis of nitrogen and argon isotopes in fluid inclusions trapped in 3.0- to 3.5-billion-year-old hydrothermal quartz that the partial pressure of N2 of the Archean atmosphere was lower than 1.1 bar, possibly as low as 0.5 bar, and had a nitrogen isotopic composition comparable to the present-day one. These results imply that dinitrogen did not play a significant role in the thermal budget of the ancient Earth and that the Archean partial pressure of CO2 was probably lower than 0.7 bar.
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