Cited by 138Astro and Planetary ScienceGeological and Geochemical AnalysisPlanetary Science and Exploration

Illusory Late Heavy Bombardments

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Boehnke, Patrick, Harrison, T. Mark·2016·Proceedings of the National Academy of Sciences

Abstract

Significance: The vast majority of evidence marshaled for the Late Heavy Bombardment comes from 40 Ar/ 39 Ar age spectra of Apollo samples, interpreted through “plateau” ages, which show an apparent cluster at ∼3.9 Ga. Whether such data can be uniquely inverted to constrain impact histories in the Earth−Moon system has never been tested. We show that diffusive loss of 40 Ar from a monotonically declining impactor flux coupled with the early and episodic nature of lunar crust formation tends to create clustered distributions of apparent 40 Ar/ 39 Ar ages at ca. 3.9 Ga. Instead, these 40 Ar/ 39 Ar data can be reconciled with a continuously decreasing bollide flux. Thus, impacts may have played a minimal role in terrestrial habitability, early Earth dynamics, and the formation of Hadean zircons.

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Crossref · 10.1073/pnas.1611535113

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92 of 92 references verified0 citation errors · 0 not checkable

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Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • The ribosome may have first originated in a peptide/RNA world, where both amino acids and a variety of enzymes were available.

    “In recent times, the role of proteins in the origin of ribosomes is gaining currency, implying that the ribosome may have first originated in a peptide/RNA world, where both amino acids and a variety of enzymes were available [9,13,14,15,16,17,18,19,20,21,22,92].”

    From The Origin of Prebiotic Information System in the Peptide/RNA World: A Simulation Model of the Evolution of Translation and the Genetic Code (2019) · cites this paper as [14]

    The paper’s Significance section discusses lunar impact ages, and its discussion of early life concerns whether bombardment affected terrestrial habitability. Searches for ribosomes, a peptide/RNA world, amino acids, and enzymes found no passage addressing the proposed origin of ribosomes. Page numbers were not available in our copy. (LLM, conf=0.78)

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  • The early Earth could have provided a range of environmental niches stable for millions of years.

    “Recent work suggesting that the early Earth was more temperate (Valley et al. 2002;Hren et al. 2009), and the flux of impactors smaller and less damaging than previously thought (Boehnke and Harrison 2016;Abramov and Mojzsis 2009) predicts that, as a whole, the early Earth could have provided a range of environmental niches stable for millions of years.”

    From Environmental Adaptation from the Origin of Life to the Last Universal Common Ancestor (2018) · cites this paper as Boehnke and Harrison 2016

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Cites

Flagged first, then by citations

6 of the 98 references couldn’t be matched to a known paper.

Research works printed but not linked: 5

  1. Minton DA, Jackson AP, Asphaug E, Fassett CI, Richardson JE (2015) Debris from borealis basin formation as the primary impactor population of Late Heavy Bom- bardment. Workshop on Early Solar System Impact Bombardment III (Solar Syst Explor Res Virtual Inst, Moffett Field, CA), p 3033.
  2. Dalrymple GB, Lanphere MA (1974) 40 Ar/ 39 Ar age spectra of some undisturbed ter- restrial samples. Geochim Cosmochim Acta 38(5):715-738.
  3. Warren PH, Taylor GJ (2014) The Moon. Treatise on Geochemistry. eds Holland H, Turekian K (Elsevier, New York), Vol 2, 2nd Ed, pp 213-250.
  4. Palme H, O'Neill HSC (2003) Cosmochemical estimates of mantle composition. Treatise on Geochemistry, eds Holland H, Turekian K (Elsevier, New York), Vol 2, pp 1-38.
  5. Alexander EC, Davis PK (1974) 40 Ar-39 Ar ages and trace element contents of Apollo 14 breccias. Geochim Cosmochim Acta 38(6):911-928.

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Authors
Boehnke, P., & Harrison, T. M.
Affiliations
University of California, Los Angeles (US)
Venue
Proceedings of the National Academy of Sciences
Published
2016-09-12
Volume
113
Issue
39
Pages
10802-10806
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2519355055
Cited by
138
References
98
Citations by year
2026: 8 · 2025: 12 · 2024: 15 · 2023: 12 · 2022: 13 · 2021: 8 · 2020: 22 · 2019: 20 · 2018: 13 · 2017: 13
FWCI
7.11
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Science Foundation (EAR-0948724, EAR-1339051)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Planetary Science and Exploration
Keywords
Late Heavy Bombardment, plateau ages, argon diffusion, lunar impact history, Apollo samples, lunar magmatism

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