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

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

DOI 10.1146/annurev.earth.33.092203.122614

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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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Authors: Jacobsen, S. B.
Affiliations: Harvard University (US)
Corresponding author: Jacobsen, Stein B.
ORCID: Jacobsen, Stein B.
Venue: Annual Review of Earth and Planetary Sciences
Publisher: Annual Reviews
Published: 2005-05-31
Volume: 33
Issue: 1
Pages: 531-570
ISSN: 0084-6597 (ISSN-L)
1545-4495
DOI: 10.1146/annurev.earth.33.092203.122614
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 › Earth and Planetary Sciences › Space and Planetary Science › Astro and Planetary Science
Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › 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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THE Hf-W ISOTOPIC SYSTEM AND THE ORIGIN OF THE EARTH AND MOON

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