Iron isotope evidence for very rapid accretion and differentiation of the proto-EarthOPEN ACCESS 

· by · in , , ,

Martin Schiller, Martin Bizzarro, and Julien Siebert

Science Advances 12 Feb 2020:
Vol. 6, no. 7, eaay7604
DOI: 10.1126/sciadv.aay7604

LINK (OPEN ACCESS)
PDF (OPEN ACCESS)

“Nucleosynthetic isotope variability among solar system objects provides insights into the accretion history of terrestrial planets. We report on the nucleosynthetic Fe isotope composition (μ54Fe) of various meteorites and show that the only material matching the terrestrial composition is CI (Ivuna-type) carbonaceous chondrites, which represent the bulk solar system composition. All other meteorites, including carbonaceous, ordinary, and enstatite chondrites, record excesses in μ54Fe. This observation is inconsistent with protracted growth of Earth by stochastic collisional accretion, which predicts a μ54Fe value reflecting a mixture of the various meteorite parent bodies. Instead, our results suggest a rapid accretion and differentiation of Earth during the ~5–million year disk lifetime, when the volatile-rich CI-like material is accreted to the proto-Sun via the inner disk.”

Related posts (automatically generated):

  1. Pb isotope evidence for rapid accretion and differentiation of planetary embryosOPEN ACCESS 
  2. The accretion and differentiation of Earth under oxidizing conditions
  3. Earth’s accretion inferred from iron isotopic anomalies of supernova nuclear statistical equilibrium originOPEN ACCESS 
  4. Accretion and differentiation of early planetary bodies as recorded in the composition of the silicate Earth
  5. Nitrogen isotope evidence for Earth’s heterogeneous accretion of volatilesOPEN ACCESS 
  6. Chromium Stable Isotope Panorama of Chondrites and Implications for Earth Early Accretion
  7. Molybdenum isotopic evidence for the late accretion of outer Solar System material to Earth
  8. Anatomy of rocky planets formed by rapid pebble accretion II. Differentiation by accretion energy and thermal blanketingOPEN ACCESS 
  9. Bulk chondrite variability in mass independent magnesium isotope compositions – Implications for initial solar system 26Al/27Al and the timing of terrestrial accretion
  10. Highly reduced accretion of the Earth by large impactors? Evidence from elemental partitioning between sulfide liquids and silicate melts at highly reduced conditions
Tags: , , , , ,