Lead Isotopic Ages of Chondrules and Calcium-Aluminum-Rich Inclusions

  title={Lead Isotopic Ages of Chondrules and Calcium-Aluminum-Rich Inclusions},
  author={Yuri Amelin and Alexander N. Krot and Ian Douglass Hutcheon and Alexander A. Ulyanov},
  pages={1678 - 1683}
The lead-lead isochron age of chondrules in the CR chondrite Acfer 059 is 4564.7 ± 0.6 million years ago (Ma), whereas the lead isotopic age of calcium-aluminum–rich inclusions (CAIs) in the CV chondrite Efremovka is 4567.2 ± 0.6 Ma. This gives an interval of 2.5 ± 1.2 million years (My) between formation of the CV CAIs and the CR chondrules and indicates that CAI- and chondrule-forming events lasted for at least 1.3 My. This time interval is consistent with a 2- to 3-My age difference between… 
Chronology of the early Solar System from chondrule-bearing calcium-aluminium-rich inclusions
It is reported that relict chondrule material in the Allende meteorite, composed of olivine and low-calcium pyroxene, occurs in the outer portions of two CAIs and is 16O-poor, contrary to the presence of relict CAIs inside chondrules, as well as to the higher abundance of 26Al in CAIs.
Aluminum-Magnesium and Oxygen Isotope Study of Relict Ca-Al-rich Inclusions in Chondrules
Relict Ca-Al-rich inclusions (CAIs) in chondrules crystallized before their host chondrules and were subsequently partly melted together with chondrule precursors during chondrule formation. Like
Contemporaneous formation of chondrules and refractory inclusions in the early Solar System
The discovery of a chondrule fragment embedded in a CAI strongly suggest that the formation of chondrules and CAIs overlapped in time and space, and that there were large fluctuations in the oxygen isotopic compositions in the solar nebula probably synchronizing astrophysical pulses.
Chromium Isotopic Evidence for an Early Formation of Chondrules from the Ornans CO Chondrite
Chondrules are the main components of primitive meteorites and possibly the building blocks of planetary embryos and terrestrial planets. However, their ages and modes of formation are still highly
Mg isotope evidence for contemporaneous formation of chondrules and refractory inclusions
The presence of excess 26Mg resulting from in situ decay of the short-lived 26Al nuclide in CAIs and chondrules from the Allende meteorite is reported, indicating that Allende chondrule formation began contemporaneously with the formation of CAIs, and continued for at least 1.4 Myr.


Toward an Astrophysical Theory of Chondrites
The chondrules, calcium-aluminum-rich inclusions (CAIs), and rims in chondritic meteorites could be formed when solid bodies are lifted by the aerodynamic drag of a magnetocentrifugally driven wind
Incorporation of short-lived (10)Be in a calcium-aluminum-rich inclusion from the allende meteorite
The particle fluence inferred from the initial beryLLium-10/beryllium-9 is sufficient to produce other short-lived nuclides, calcium-41 and manganese-53, found in meteorites, but the high canonical abundance of aluminum-26 may still require seeding of the solar system by radioactive stellar debris.