Origin and evolution of atmospheric xenon and other noble gases : geodynamical and atmospheric implications

Abstract : The origin of the Earth's atmosphere remains poorly understood. Its elemental and isotopic compositions have been shaped by numerous events in the history of our planet, such as extraterrestrial contributions, mantle degassing, atmospheric escape etc. This study aimed to analyze the composition of atmospheric gases trapped in several billion years old samples in order to better understand the origin and evolution of the Earth's atmosphere. Isotope analyses of xenon, a noble gas, demonstrate that part of the atmosphere was not brought by meteorites but might have been delivered to the Earth's atmosphere by volatile-rich bodies such as comets. Furthermore, the isotopic composition of atmospheric Xe evolved over geological ages and can be linked to the progressive oxidation of the atmosphere that permitted the emergence and development of modern forms of life.
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  • HAL Id : tel-02153924, version 1

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Guillaume Avice. Origin and evolution of atmospheric xenon and other noble gases : geodynamical and atmospheric implications. Ocean, Atmosphere. Université de Lorraine, 2016. English. ⟨NNT : 2016LORR0032⟩. ⟨tel-02153924⟩

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