53Mn-53Cr Chronometry of CB chondrite: Evidence for uniform distribution of 53Mn in the early solar system

Katsuyuki Yamashita, Seiji Maruyama, Akane Yamakawa, Eizou Nakamura

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

High-precision Cr isotope ratios for chondrules and metal grain separated from CB chondrite Gujba were determined. The ε54Cr values (εiCr = [(iCr/52Cr)sample/( iCr/52Cr)standard - 1] × 104) for all samples were identical within the analytical uncertainty, with a mean value of +1.29 ± 0.02. Uniform ε54Cr signatures of both chondrules and metal grains imply that the Cr isotope systematics of the meteorite was once completely equilibrated. The ε53Cr values of the chondrules and metal grain, on the other hand, display a strong correlation with the 55Mn/52Cr ratio. The 53Mn/55Mn calculated from the slope of the isochron is (3.18 ± 0.52) × 10-6. This corresponds to absolute ages of 4563.7 ± 1.2 Ma and 4563.5 ± 1.1 Ma using angrites D'Orbigny and LEW 86010, respectively, as time anchors. These ages are consistent with the ages obtained using other short- and long-lived radio nuclides, supporting the uniform distribution of 53Mn in the early solar nebula.

Original languageEnglish
Pages (from-to)20-24
Number of pages5
JournalAstrophysical Journal
Volume723
Issue number1
DOIs
Publication statusPublished - Nov 1 2010

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chondrule
chondrites
chondrite
solar system
metal
isotope
metals
solar nebula
isotope ratios
meteorites
nuclides
anchor
meteorite
radionuclide
isotopes
signatures
slopes
distribution

Keywords

  • Abundances
  • Asteroids: general
  • Astrochemistry
  • Meteorites
  • Meteoroids
  • Meteors
  • Minor planets
  • Nuclear reactions
  • Nucleosynthesis
  • Protoplanetary disks

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics
  • Nuclear and High Energy Physics

Cite this

53Mn-53Cr Chronometry of CB chondrite : Evidence for uniform distribution of 53Mn in the early solar system. / Yamashita, Katsuyuki; Maruyama, Seiji; Yamakawa, Akane; Nakamura, Eizou.

In: Astrophysical Journal, Vol. 723, No. 1, 01.11.2010, p. 20-24.

Research output: Contribution to journalArticle

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