Cited by 37Geological and Geochemical AnalysisAstro and Planetary SciencePaleontology and Stratigraphy of Fossils

Subduction and atmospheric escape of Earth's seawater constrained by hydrogen isotopes

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Kurokawa, Hiroyuki, Foriel, Julien, Laneuville, Matthieu, Houser, Christine, Usui, Tomohiro·2018·Earth and Planetary Science Letters

Abstract

Abstract The hydrogen isotopic (D/H) ratio reflects the global cycling and evolution of water on Earth as it fractionates through planetary processes. We model the water cycle taking seafloor hydrothermal alteration, chemical alteration of continental crust, slab subduction, hydrogen escape from the early Earth, and degassing at mid-ocean ridges, hot spots, and arcs into account. The differences in D/H ratios between present-day oceans, oceanic and continental crust, and mantle are thought to reflect isotopic fractionation through seafloor alteration, chemical alteration, and slab dehydration. However, if the speed of plate tectonics has been nearly constant throughout Earth's history, the degassing and regassing rates are too small to reach the present-day D/H ratios. We show that (a) hydrogen escape from reduced early atmosphere, (b) secular net regassing, or (c) faster plate tectonics on early Earth is needed to reproduce the present-day D/H ratios of the water reservoirs. The low D/H ratio of Archean seawater at 3.8 Ga has previously been interpreted as a signature of (a) hydrogen escape, but we find it can also be explained either by (b) secular net degassing or by (c) faster plate tectonics on early Earth. The rates of hydrogen escape from early Earth and secular regassing on present-day Earth are constrained to be lower than 2.1 × 10 11 kg/yr and 3.9 × 10 11 kg/yr. Consequently, the volume of water in the present-day mantle could result entirely from the regassing through Earth's history. In that case, the volume of initial oceans could be 2 to 3 times larger than that of current Earth. We suggest that, in addition to the D/H ratio of Archean seawater, identifying the D/H ratios of both seawater and mantle throughout Earth's history would allow to distinguish these evolutionary scenarios.

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Crossref · 10.1016/j.epsl.2018.06.016

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  • Evidence points to high levels of Archean CH4.

    “Evidence points to high levels of Archean CH4 (Fig. 3B).”

    From The Archean atmosphere (2020) · cites this paper as [186]

    Section 4.1 says a high CH4 concentration, corresponding to an upper-limit scenario of 900 ppmv, might have been possible during the early Archean. But the Conclusions say the D/H evidence can also be explained without hydrogen escape; the paper does not establish that the evidence points to high Archean CH4 levels. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • The D/H ratio of 3.7 Ga-old seawater estimated from serpentine minerals is 2.5% lighter than today.

    “Third, the deuterium-to-hydrogen (D/H) ratio of 3.7 Ga-old seawater estimated from serpentine minerals is 2.5% lighter than today, which could be explained by rapid Archean escape of hydrogen and isotopic fractionation (185, 186).”

    From The Archean atmosphere (2020) · cites this paper as [186]

    Sections 2.4 and 4.4 report a serpentine-based estimate for 3.8 Ga seawater, not 3.7 Ga seawater, and give it an uncertainty of ±5‰ that the claim omits. The Conclusions say hydrogen escape could explain the low Archean D/H ratio, while also identifying other possible explanations. Page numbers are not available in our copy. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • This lighter D/H could be explained by rapid Archean escape of hydrogen and isotopic fractionation.

    “Third, the deuterium-to-hydrogen (D/H) ratio of 3.7 Ga-old seawater estimated from serpentine minerals is 2.5% lighter than today, which could be explained by rapid Archean escape of hydrogen and isotopic fractionation (185, 186).”

    From The Archean atmosphere (2020) · cites this paper as [186]

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Authors
Kurokawa, H., Foriel, J., Laneuville, M., Houser, C., & Usui, T.
Affiliations
Tokyo Institute of Technology (JP)
Corresponding author
Kurokawa, Hiroyuki
Venue
Earth and Planetary Science Letters
Publisher
Elsevier BV
Published
2018-09
Volume
497
Pages
149-160
ISSN
0012-821X (ISSN-L)
OpenAlex
W2807270763
Cited by
37
References
73
Citations by year
2026: 1 · 2025: 4 · 2024: 1 · 2023: 5 · 2022: 6 · 2021: 7 · 2020: 4 · 2019: 8 · 2018: 1
FWCI
3.59
Type
journal article
Language
en
Open access
Locations
  • Earth and Planetary Science Letters (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • JSPS (15J09448, 17H06457, 18K13602, 16K05619, 17H06454, 17H06459)
  • MEXT (15H05832)
  • Earth-Life Science Institute
Topics
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
Keywords
hydrogen isotopes, hydrogen/deuterium ratio, seawater, atmospheric escape, slab subduction, degassing, plate tectonics, early Earth atmosphere, mantle water, slab dehydration

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