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Heterogeneity of Mg Isotopes and Variable ^(26)Al/^(27)Al Ratio in FUN CAIs

Park, C. and Nagashima, K. and Hutcheon, I. D. and Wasserburg, G. J. and Papanastassiou, D. A. and Davis, A. M. and Huss, G. R. and Krot, A. N. (2013) Heterogeneity of Mg Isotopes and Variable ^(26)Al/^(27)Al Ratio in FUN CAIs. Meteoritics and Planetary Science, 48 (S1). A277. ISSN 1086-9379. doi:10.1111/maps.12165.

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CAIs with fractionation and unidentified nuclear effects (FUN CAIs) are characterized by low initial ^(26)Al/^(27)Al ratios, large mass-dependent fractionation in Mg (F_(Mg)), Si, and O isotopes, and nucleosynthetic anomalies in several elements (e.g., Ca, Ti). Most Mg-isotope studies of FUN CAIs were performed more than 30 years ago with TIMS. Here we report high-precision Mg-isotope data of individual minerals from the Axtell 2271, BG82DH8, EK1-4-1, C1, TE, and CG14 FUN CAIs measured with the UH Cameca ims-1280. We followed the procedure described in [2]. Measured Mg-isotope data were correct-ed for fractionation using terrestrial standards assuming that their isotopic compositions are the same as values of [3], and an exponential law with a coefficient β = 0.514. The overall conclusions of this study do not change with the choice of β.

Item Type:Article
Related URLs:
URLURL TypeDescription
Wasserburg, G. J.0000-0002-7957-8029
Huss, G. R.0000-0003-4281-7839
Krot, A. N.0000-0002-2278-8519
Alternate Title:Heterogeneity of Mg Isotopes and Variable 26Al/27Al Ratio in FUN CAIs
Additional Information:© 2013 The Meteoritical Society. Article first published online: 1 Jul. 2013.
Issue or Number:S1
Record Number:CaltechAUTHORS:20131206-093814685
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Official Citation:(2013), 76th Annual Meeting of the Meteoritical Society July 29-August 2, 2013. Meteoritics & Planetary Science, 48: A32–A394. doi: 10.1111/maps.12165
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42881
Deposited By: Tony Diaz
Deposited On:18 Dec 2013 22:25
Last Modified:10 Nov 2021 16:29

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