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 language | English |
|---|---|
| Pages (from-to) | 20-24 |
| Number of pages | 5 |
| Journal | Astrophysical Journal |
| Volume | 723 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Nov 1 2010 |
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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 journal › Article
}
TY - JOUR
T1 - 53Mn-53Cr Chronometry of CB chondrite
T2 - Evidence for uniform distribution of 53Mn in the early solar system
AU - Yamashita, Katsuyuki
AU - Maruyama, Seiji
AU - Yamakawa, Akane
AU - Nakamura, Eizou
PY - 2010/11/1
Y1 - 2010/11/1
N2 - 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.
AB - 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.
KW - Abundances
KW - Asteroids: general
KW - Astrochemistry
KW - Meteorites
KW - Meteoroids
KW - Meteors
KW - Minor planets
KW - Nuclear reactions
KW - Nucleosynthesis
KW - Protoplanetary disks
UR - http://www.scopus.com/inward/record.url?scp=78349284775&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78349284775&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/723/1/20
DO - 10.1088/0004-637X/723/1/20
M3 - Article
AN - SCOPUS:78349284775
VL - 723
SP - 20
EP - 24
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
ER -