Multiple generations of fractionated hibonite-rich CAIs sampled the solar nebula at different degrees of isotopic heterogeneity
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- Multiple generations of fractionated hibonite-rich CAIs sampled the solar nebula at different degrees of isotopic heterogeneity
- Other Titles
- 태양계 성운의 동위원소 비균질성을 나타내는 히보나이트 부화 CAI의 다양한 생성 기작
- Davis A. M.
Tenner T. J.
Krot A. N.
Kita N. T.
Heck P. R.
- Issue Date
- Davis A. M., et al. 2015. Multiple generations of fractionated hibonite-rich CAIs sampled the solar nebula at different degrees of isotopic heterogeneity. 46th Lunar and Planetary Science Conference. 미국 우즈랜드(Woodlands, USA). 2015.03.16~2015.03.20.
- Calcium-aluminum-rich inclusions (CAIs) are the oldest dated objects that formed in the solar system . A few of these show large massdependent enrichments in the heavy isotopes of some elements, attesting to a formation by melt distillation of low-temperature precursors, and are often classified as fractionated (F) CAIs ( and references therein). Some fractionated CAIs also have large mass-independent anomalies of nucleosynthetic origin and are classified as FUN (Fractionated and Unidentified Nuclear effects) CAIs. Other CAIs with large unidentified nuclear (UN) anomalies lack fractionation effects. While F and FUN CAIs are often not petrologically distinct from regular CAIs, UN effects are most commonly found in hiboniterich
CAIs like platy hibonite crystals (PLACs) .
We have studied 80 hibonite-rich CAIs separated from the Murchison meteorite for their UN characteristics [4, 5] and incorporation of 26Al at their time of formation. Here, we report the mass-dependent and massindependent isotope effects in O, Mg, Ca and Ti in 7 of these hibonite-rich CAIs that have F(UN) characteristics. We also infer their initial 26Al/27Al ratios [(26Al/27Al)0] from model and internal isochrons.
- Conference Name
- 46th Lunar and Planetary Science Conference
- Conference Place
- 미국 우즈랜드(Woodlands, USA)
- Conference Date
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