Constraints on the Origin of Chondrules and CAIs from Short-Lived and Long-Lived Radionuclides

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The high time resolution Pb-Pb ages and short-lived nuclide based relative ages for CAIs and chondrules are reviewed. The solar system started at 4567.2 {+-} 0.6Ma inferred from the high precision Pb-Pb ages of CAIs. Time scales of CAIs ({le}0.1Myr), chondrules (1-3Myr), and early asteroidal differentiation ({ge}3Myr) inferred from {sup 26}Al relative ages are comparable to the time scale estimated from astronomical observations of young star; proto star, classical T Tauri star and week-lined T Tauri star, respectively. Pb-Pb ages of chondrules also indicate chondrule formation occur within 1-3 Myr after CAIs. Mn-Cr isochron ages of chondrules are similar to ... continued below

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Kita, N. T.; Huss, G. R.; Tachibana, S.; Amelin, Y.; Nyquist, L. E. & Hutcheon, I. D. October 24, 2005.

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The high time resolution Pb-Pb ages and short-lived nuclide based relative ages for CAIs and chondrules are reviewed. The solar system started at 4567.2 {+-} 0.6Ma inferred from the high precision Pb-Pb ages of CAIs. Time scales of CAIs ({le}0.1Myr), chondrules (1-3Myr), and early asteroidal differentiation ({ge}3Myr) inferred from {sup 26}Al relative ages are comparable to the time scale estimated from astronomical observations of young star; proto star, classical T Tauri star and week-lined T Tauri star, respectively. Pb-Pb ages of chondrules also indicate chondrule formation occur within 1-3 Myr after CAIs. Mn-Cr isochron ages of chondrules are similar to or within 2 Myr after CAI formation. Chondrules from different classes of chondrites show the same range of {sup 26}Al ages in spite of their different oxygen isotopes, indicating that chondrule formed in the localized environment. The {sup 26}Al ages of chondrules in each chondrite class show a hint of correlation with their chemical compositions, which implies the process of elemental fractionation during chondrule formation events.

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PDF-file: 26 pages; size: 2 Mbytes

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  • Chondrites and the Protoplanetary Disk, Constraints on the Origin of Chondrules and CAIs from Short-Lived and Long-Lived Radionuclides, Astronomical Society of the Pacific, Provo, UT 2005, pp. 558-587

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  • Report No.: UCRL-BOOK-216767
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 907835
  • Archival Resource Key: ark:/67531/metadc879910

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 24, 2005

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  • Sept. 22, 2016, 2:13 a.m.

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  • Oct. 6, 2016, 12:31 p.m.

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Kita, N. T.; Huss, G. R.; Tachibana, S.; Amelin, Y.; Nyquist, L. E. & Hutcheon, I. D. Constraints on the Origin of Chondrules and CAIs from Short-Lived and Long-Lived Radionuclides, book, October 24, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc879910/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.