Rapid accretion and early core formation on asteroids and the terrestrial planets from Hf–W chronometry

By T. Kleine, C. Münker, K. Mezger, H. Palme. Nature, 2002

743 citations recorded by the source corpus.

View Paper: https://www.semanticscholar.org/paper/c70f71a415183529c65a06b05a2d2faaf6049a81

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1. A. Morbidelli
2. S. Raymond
3. L. Elkins‐Tanton
4. D. O'Brien
5. N. Dauphas
6. T. Kleine
7. C. Mordasini
8. H. Lammer

Citations in the corpus

• Magma oceans in the inner solar system (2012, background): “Measurements of 182W and 142Nd in Martian meteorites yield model ages suggesting that the core and mantle fractionated within 13 ± 2 Ma of the origin of the solar system (Lee & Halliday 1995, Blichert-Toft et al. 1999, Kleine et al. 2002, Foley et al. 2005).”
• Dawn Mission to Vesta and Ceres (2007, background): “This core is believed to have formed within 3 Ma of the solar system’s formation (Yin et al. 2002; Kleine et al. 2002).”
• Where, oh where has the r-process gone? (2007, background): “More recent measurements have now established a reliable value of (182Hf/180Hf)ESS = (1.00±0.08)×10−4 (Yin et al., 2002; Kleine et al., 2002).”
• Core formation and the oxidation state of the Earth (2005, background): “Although there is no remaining geological evidence of these profound events, radiogenic isotopes (for example [1,2]) provide information on their timing while dynamical modeling yields insight into the physics of planetary formation [4].”
• Cosmochemical Estimates of Mantle Composition (2014, unknown): “Core formation ended at ,30 million years after the beginning of the solar system (Kleine et al., 2002).”
• The partitioning of trace elements between ilmenite, ulvospinel, armalcolite and silicate melts with implications for the early differentiation of the moon (2006, background): “Lee et al., 1997; Kleine et al., 2002, 2004; Schoenberg et al., 2002; Yin et al., 2002) indicate that there are significant isotopic enrichments in radiogenic 182 Wi n”
• Temperatures, Heat, and Energy in the Mantle of the Earth (2007, background): “We know now that iron-silicate differentiation occurred very early in the solar system and affected planetesimals (Kleine et al., 2002).”
• A Perspective from Extinct Radionuclides on a Young Stellar Object: The Sun and Its Accretion Disk (2011, background): “However, these measurements were later shown to be erroneous (Kleine et al. 2002, Schoenberg et al. 2002, Yin et al. 2002).”
• Hf–W mineral isochron for Ca,Al-rich inclusions: Age of the solar system and the timing of core formation in planetesimals (2008, result): “…ðe182WÞCAIs ðe182WÞchondrites ð1Þ where k = 0.078 ± 0.002 Ma 1 (Vockenhuber et al., 2004), (e182W)chondrites is the present-day e 182W of chondrites of 1.9 ± 0.1 (Kleine et al., 2002; Schoenberg et al., 2002; Yin et al., 2002; Kleine et al., 2004), and (e182W)CAIs is the initial e182W of CAIs as…”
• Making other earths: dynamical simulations of terrestrial planet formation and water delivery (2003, methodology): “There is a constraint for our own Solar System from measured Hf-W ratios that both the Moon and the Earth’s core were formed by t ≃ 30 Myr (Kleine et al. 2002; Yin et al. 2002).”
• Terrestrial planet formation with strong dynamical friction (2006, methodology): “…more dynamically excited (i.e., larger eccentricity e and inclination i) than the terrestrial planets in our Solar System and, on average, take too long to form compared to geochemical estimates of the Earth’s accretion timescale (Halliday et al., 2000; Kleine et al., 2002; Yin et al., 2002).”
• Magma ocean fractional crystallization and cumulate overturn in terrestrial planets: Implications for Mars (2003, background): “The existence of an early magma ocean in Mars is supported by 182W and 142Nd anomalies that date the fractionation of the core and mantle to within 13 ± 2 Myr of the origin of the solar system (Kleine et al. 2002; Blichert-Toft et al. 1999; Lee and Halliday 1995).”
• Astrophysics with Extraterrestrial Materials (2016, background): “Small variations are seen across different types of irons, but indications are that differentiation and core formation occurred over a period of ∼1 Myr after CAI formation (Kleine et al. 2002, Burkhardt et al. 2008, Kruijer et al. 2014).”
• The origin of water on Mars (2002, result): “Alternative to the “distal source” model we present h is the hypothesis that both the Earth and Mars acquired water from local planetesimals in a cold nebula (Drake Righter, 2002).”