Cited by 136Geological and Geochemical AnalysisPaleontology and Stratigraphy of FossilsAstro and Planetary Science

Evolution of atmospheric xenon and other noble gases inferred from Archean to Paleoproterozoic rocks

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Avice, G., Marty, B., Burgess, R., Hofmann, A., Philippot, P., Zahnle, K., Zakharov, D.·2018·Geochimica et Cosmochimica Acta

Abstract

We have analyzed ancient atmospheric gases trapped in fluid inclusions contained in minerals of Archean (3.3 Ga) to Paleozoic (404 Ma) rocks in an attempt to document the evolution of the elemental composition and isotopic signature of the atmosphere with time. Doing so, we aimed at understanding how physical and chemical processes acted over geological time to shape the modern atmosphere. Modern atmospheric xenon is enriched in heavy isotopes by 30–40‰ u−1 relative to Solar or Chondritic xenon. Previous studies demonstrated that, 3.3 Ga ago, atmospheric xenon was isotopically fractionated (enriched in the light isotopes) relative to the modern atmosphere, by 12.9 ± 1.2 (1σ) ‰ u−1, whereas krypton was isotopically identical to modern atmospheric Kr. Details about the specific and progressive isotopic fractionation of Xe during the Archean, originally proposed by Pujol et al. (2011), are now well established by this work. Xe isotope fractionation has evolved from 21‰ u−1 at 3.5 Ga to 12.9‰ u−1 at 3.3 Ga. The current dataset provides some evidence for stabilization of the Xe fractionation between 3.3 and 2.7 Ga. However, further studies will be needed to confirm this observation. After 2.7 Ga, the composition kept evolving and reach the modern-like atmospheric Xe composition at around 2.1 Ga ago. Xenon may be the second atmospheric element, after sulfur, to show a secular isotope evolution during the Archean that ended shortly after the Archean-Proterozoic transition. Fractionation of xenon indicates that xenon escaped from Earth, probably as an ion, and that Xe escape stopped when the atmosphere became oxygen-rich. We speculate that the Xe escape was enabled by a vigorous hydrogen escape on the early anoxic Earth. Organic hazes, scavenging isotopically heavy Xe, could also have played a role in the evolution of atmospheric Xe. For 3.3 Ga-old samples, Ar-N2 correlations are consistent with a partial pressure of nitrogen (pN2) in the Archean atmosphere similar to, or lower than, the modern one, thus requiring other processes than a high pN2 to keep the Earth's surface warm despite a fainter Sun. The nitrogen isotope composition of the atmosphere at 3.3 Ga was already modern-like, attesting to inefficient nitrogen escape to space since that time.

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Crossref · 10.1016/j.gca.2018.04.018

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  • Xenon dragged out into space by escaping hydrogen during the Archean and Hadean best explains the progressive mass fractionation.

    “Xenon dragged out into space by escaping hydrogen during the Archean and Hadean best explains the progressive mass fractionation (49, 187).”

    From The Archean atmosphere (2020) · cites this paper as [49]

    Section 4.2 explains how escaping hydrogen could drag xenon ions into space and produce mass fractionation, and the Conclusions propose this mechanism for xenon's long-term isotopic evolution (page numbers unavailable). But the paper presents hydrogen-driven escape as a proposed mechanism, not the established best explanation; it also allows a role for organic hazes. Its documented evolution extends into the Paleoproterozoic, rather than being confined to the Archean and Hadean. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Xenon in fluid inclusions in Archean rocks becomes isotopically heavier through the Archean relative to an initial solar composition until the fractionation reaches that of modern air around 2.1 to 2.0 Ga ago.

    “Xenon in fluid inclusions in Archean rocks becomes isotopically heavier through the Archean relative to an initial solar composition until the fractionation reaches that of modern air around 2.1 to 2.0 Ga ago (Fig. 4) (49).”

    From The Archean atmosphere (2020) · cites this paper as [49]

    The Abstract and Conclusions describe xenon in ancient fluid inclusions evolving toward the modern atmospheric isotopic composition. But the Introduction and §3.1 identify the starting composition as U-Xe, not solar xenon; the Conclusions place the modern composition between 2.1 and 1.7 Ga, rather than specifically at 2.1–2.0 Ga. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • The N2/36Ar ratio in fluid inclusions indicates pN2 <1.0 bar (2σ) at 3.3 Ga ago and <1.1 bar at 3.5 to 3.0 Ga ago.

    “Second, the N2/36Ar ratio in fluid inclusions indicates pN2 <1.0 bar [2σ] at 3.3 Ga ago and <1.1 bar at 3.5 to 3.0 Ga ago (48, 49).”

    From The Archean atmosphere (2020) · cites this paper as [49]

    The paper's discussion of the 3.3 Ga Barberton samples uses N₂/³⁶Ar to infer that atmospheric nitrogen pressure was likely below the modern level at 1σ and incompatible with two to three times the modern level at 2σ. It does not give the claimed <1.0 bar limit at 2σ or a <1.1 bar limit for 3.5–3.0 Ga. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • The six lighter krypton isotopes are barely fractionated.

    “Today, the nine atmospheric Xe isotopes [124 to 136 atomic mass units (amu)], have a huge fractionation of 4.2% per amu relative to solar or chondritic sources, whereas the six, lighter krypton isotopes (76 to 86 amu) are barely fractionated.”

    From The Archean atmosphere (2020) · cites this paper as [49]

    Section 3.2 reports that krypton in the ancient samples is isotopically identical to modern atmospheric krypton and says the fractionation recorded by xenon does not affect other noble gases. This supports the contrast with xenon, but the comparison is between ancient and modern krypton; it does not establish that modern atmospheric krypton is barely fractionated relative to solar or chondritic sources. No page number is available in our copy. (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • Today, the nine atmospheric Xe isotopes have a huge fractionation of 4.2% per amu relative to solar or chondritic sources.

    “Today, the nine atmospheric Xe isotopes [124 to 136 atomic mass units (amu)], have a huge fractionation of 4.2% per amu relative to solar or chondritic sources, whereas the six, lighter krypton isotopes (76 to 86 amu) are barely fractionated.”

    From The Archean atmosphere (2020) · cites this paper as [49]

    The Introduction (page not provided) says modern atmospheric Xe has nine isotopes and is strongly enriched in heavy relative to light isotopes compared with chondritic or solar-wind Xe. It gives a fractionation of 30–40‰ per amu (3–4%), calculated from the light isotopes, rather than the claimed 4.2% per amu across all nine isotopes. (LLM, conf=0.86)

    Experimental — accuracy not yet measured

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Cites

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Research works printed but not linked: 4

  1. Basford J. R., Dragon J. C., Pepin R. O., Coscio M. R., and Murthy V. R. (1973) Krypton and Xenon in lunar fines. Proceedings of the 4th Lunar Science Conference, 1915-1955.
  2. Dauphas N. and Morbidelli A. (2014) Geochemical and Planetary Dynamical Views on the Origin of Earth's Atmosphere and Oceans. In Treatise on Geochemistry (Second Edition) (ed.
  3. Kyser K., Hiatt E., Renac C., Durocher K., Holk G. and Deckart K. (2000) Diagenetic fluids in Paleo-and Meso-Proterozoic sedimentary basins and their implications for long protracted fluid histories. In Fluids and basin evolution (ed. K. Kyser). Fluids and basin evolution. pp. 73-506.
  4. Pujol M., Marty B. and Burgess R. (2013b) Reply to comment on ''Chondritic-like xenon trapped in Archean rocks: a possible signature of the ancient atmosphere" by Pujol, M., Marty, B., Burgess, R., Earth and Planetary Science Letters 308 (2011) 298-306

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Authors
Avice, G., Marty, B., Burgess, R., Hofmann, A., Philippot, P., Zahnle, K., & Zakharov, D.
Affiliations
  • Centre National de la Recherche Scientifique (FR)
  • University of Manchester (GB)
  • University of Johannesburg (ZA)
  • Ames Research Center (US)
  • University of Oregon (US)
Corresponding author
Avice, G.
Venue
Geochimica et Cosmochimica Acta
Publisher
Elsevier BV
Published
2018-07
Volume
232
Pages
82-100
ISSN
0016-7037 (ISSN-L)
OpenAlex
W2803012369
Cited by
136
References
105
Citations by year
2026: 9 · 2025: 14 · 2024: 21 · 2023: 10 · 2022: 20 · 2021: 8 · 2020: 29 · 2019: 18 · 2018: 7
FWCI
11.12
Type
journal article
Language
en
Open access
Locations
  • Geochimica et Cosmochimica Acta (publishedVersion, cc-by-nc-nd)
  • Research Explorer (The University of Manchester) (publishedVersion, other-oa)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion, cc-by-nc-nd)
  • HAL (submittedVersion, cc-by-nd)
Funders
European Research Council
Topics
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
Keywords
atmospheric xenon, noble gases, Archean atmosphere, krypton, fluid inclusions, noble gas isotopes, atmospheric escape, hydrogen escape, nitrogen partial pressure, Archean-Proterozoic transition, early Earth atmosphere, atmospheric evolution, organic haze

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