Cited by 234Astro and Planetary ScienceGeological and Geochemical AnalysisPaleontology and Stratigraphy of Fossils

THE Hf-W ISOTOPIC SYSTEM AND THE ORIGIN OF THE EARTH AND MOON

Jacobsen, Stein B.·2005·Annual Review of Earth and Planetary Sciences

Abstract

▪ Abstract The Earth has a radiogenic W-isotopic composition compared to chondrites, demonstrating that it formed while 182 Hf (half-life 9 Myr) was extant in Earth and decaying to 182 W. This implies that Earth underwent early and rapid accretion and core formation, with most of the accumulation occurring in ∼10 Myr, and concluding approximately 30 Myr after the origin of the Solar System. The Hf-W data for lunar samples can be reconciled with a major Moon-forming impact that terminated the terrestrial accretion process ∼30 Myr after the origin of the Solar System. The suggestion that the proto-Earth to impactor mass ratio was 7:3 and occurred during accretion is inconsistent with the W isotope data. The W isotope data is satisfactorily modeled with a Mars-sized impactor on proto-Earth (proto-Earth to impactor ratio of 9:1) to form the Moon at ∼30 Myr.

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Crossref · 10.1146/annurev.earth.33.092203.122614

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  • The formation of Earth commenced no earlier than 10 million years after the formation of the Solar System.

    “Thus, the formation of Earth commenced no earlier than 10 million years after the formation of the Solar System (Kleine et al., 2004; Jacobsen, 2005; Touboul et al., 2007).”

    From The Astrobiology Primer v2.0 (2016) · cites this paper as Jacobsen, 2005

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Authors
Jacobsen, S. B.
Affiliations
Harvard University (US)
Corresponding author
Jacobsen, Stein B.
Venue
Annual Review of Earth and Planetary Sciences
Published
2005-05-31
Volume
33
Issue
1
Pages
531-570
ISSN
  • 0084-6597 (ISSN-L)
  • 1545-4495
OpenAlex
W2133510984
Cited by
234
References
81
Citations by year
2026: 5 · 2025: 7 · 2024: 14 · 2023: 9 · 2022: 4 · 2021: 11 · 2020: 12 · 2019: 7 · 2018: 9 · 2017: 5 · 2016: 7 · 2015: 14 · 2014: 15 · 2013: 14 · 2012: 10
FWCI
2.00
Type
journal article
Language
en
Open access
closed
Locations
Annual Review of Earth and Planetary Sciences (publishedVersion)
Funders
National Aeronautics and Space Administration
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 › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
Keywords
tungsten isotopes, Hf isotopes, Earth formation, Moon formation, giant impact hypothesis, core formation, radiogenic isotopes, chondrites, Moon-forming impact

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