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Multiple generations of fractionated hibonite-rich CAIs sampled the solar nebula at different degrees of isotopic heterogeneity

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Title
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
Authors
Davis A. M.
Park, Changkun
Wadhwa M.
Tenner T. J.
Park, Changkun
Nakashima D.
Nagashima K.
Mane P.
Krot A. N.
Kita N. T.
Heck P. R.
Issue Date
2015
Citation
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.
Abstract
Calcium-aluminum-rich inclusions (CAIs) are the oldest dated objects that formed in the solar system [1]. 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 ([2] 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) [3]. 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.
URI
http://repository.kopri.re.kr/handle/201206/8347
Conference Name
46th Lunar and Planetary Science Conference
Conference Place
미국 우즈랜드(Woodlands, USA)
Conference Date
2015.03.16~2015.03.20
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