EGU22-9527
https://doi.org/10.5194/egusphere-egu22-9527
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

The end of the atmospheric xenon Archean’s evolution: a study of the Great Oxygenation Event period

Lisa Ardoin1,2, Micheal Broadley1, Matthieu Almayrac1, Guillaume Avice3, David Byrne1, Alexandre Tarantola4, Aivo Lepland5, Takuya Saito6, Tsuyoshi Komiya7, Takazo Shibuya7, and Bernard Marty1
Lisa Ardoin et al.
  • 1Université de Lorraine, CNRS, CRPG, F-54000 Nancy, France
  • 2Université Libre de Bruxelles CP160/03 Av. F.D. Roosevelt 50, 1050 Brussels, Belgium (lisa.ardoin@ulb.be)
  • 3Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005 Paris, France
  • 4Université de Lorraine, CNRS, GeoRessources laboratory, BP 70239, F-54506, Vandœuvre-lès-Nancy, France
  • 5Geological Survey of Norway, 7491 Trondheim, Norway
  • 6Department of Subsurface Geobiological Analysis and Research (D-SUGAR)
  • 7Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15, Natsushima-cho, Yokosuka 237-0061, Japan

Several geochemical tracers (S, C, O, Xe) underwent irreversible global changes during the Precambrian, and in particular during the Great Oxygenation Event (GOE), between the Archean and Proterozoïc eons [1]. Xenon is of particular interest as it presents a secular isotopic evolution during the Archean that ceased around the time of the GOE. In this regard Xe is somewhat analogous to mass-independent fractionation sulfur (MIF-S) in that it can be used to categorically identify Archean atmospheric components [2]. Xe isotopes in the modern atmosphere are strongly mass-dependent fractionated (MDF-Xe), with a depletion of the light isotopes relative to the heavy ones. There was a continuous Xe isotope evolution from primitive Xe to modern Xe that ceased between 2.6 and 1.8 Ga [2] and this evolution has been attributed to coupled H+-Xe+ escape to space [3].

The purpose of this project is to document the Xe composition of the paleo-atmosphere trapped in well-dated hydrothermal quartz fluid inclusions with ages covering the Archean-Proterozoic transition to better constraint its link with the GOE.

We have measured an isotopically fractionated Xe composition of 2.0 ± 1.8 ‰ relative to modern atmosphere at 2441 ± 1.6 Ma, in quartz vein from the Seidorechka sedimentary formation (Imandra-Varzuga Greenstone belt, Russia). A slightly younger sample from the Polisarka sedimentary formation (Imandra-Varzuga Greenstone belt, Russia) of 2434 ± 6.6 Ma does not record such fractionation and is indistinguishable from the modern atmospheric composition. A temporal link between the disappearance of the Xe isotopes fractionation and the MIF-S signature at the Archean-Proterozoic transition is clearly established for the Kola Craton. The mass-dependent evolution of Xe isotopes is the witness of a cumulative atmospheric process that may have played an important role in the oxidation of the Earth's surface [3], independently of biogenic O2 production that started long before the permanent rise of O2 in the atmosphere [4].

 

[1] Catling & Zahnle, 2020, Sciences Advances 6, eaax1420. [2] Avice et al., 2018, Geochimica et Cosmochimica Acta 232, 82-100 [3] Zahnle et al., 2019, Geochimica et Cosmochimica Acta 244, 56-85. [4] Lyons et al., 2014, Nature 506, 307-315.

How to cite: Ardoin, L., Broadley, M., Almayrac, M., Avice, G., Byrne, D., Tarantola, A., Lepland, A., Saito, T., Komiya, T., Shibuya, T., and Marty, B.: The end of the atmospheric xenon Archean’s evolution: a study of the Great Oxygenation Event period, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-9527, https://doi.org/10.5194/egusphere-egu22-9527, 2022.