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Strontium Stable Isotope Composition of Allende Fine-Grained Inclusions

Charlier, B. L. A. and Tissot, F. L. H. and Dauphas, N. (2017) Strontium Stable Isotope Composition of Allende Fine-Grained Inclusions. In: 48th Lunar and Planetary Science Conference, March 20-24, 2017, The Woodlands, TX.

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Isotopic anomalies are departures from the laws of mass-dependent fractionation that cannot be explained by radioactive decay, cosmogenic effects, or exotic isotopic fractionation processes such as nuclear field shift or magnetic effects [1 and references therein]. These anomalies often have a nucleosynthetic origin and provide clues on the stellar origin and solar system processing of presolar dust. Anomalies are most often found in refractory elements of relatively low mass, so Sr is a prime target for study. The four stable isotopes of strontium are useful for discerning the various nucleosynthetic origins of early solar system building blocks and the timing of accretion processes. Strontium-84 is the least abundant (0.56%) of these isotopes, but is particularly significant in being a p-process only nuclide that is produced in core-collapse or type Ia supernovae [2,3]. The more abundant isotopes ^(86)Sr (9.86%), ^(87)Sr (7.00%) and ^(88)Sr (82.58%) are produced in s- and r-processes in asymptotic giant branch stars and other stellar types [4]. Additionally, ^(87)Sr is produced by ^(87)Rb decay in proportions that dominate over possible nucleosynthetic variations but provide timings of early solar system processes, most notably volatile element depletion [5-7]. Furthermore, variations in strontium isotopic ratios caused by high-temperature massdependent fractionation [8] are also important [9-12], as they provide insights into nebular and accretionary processes.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription Website
Tissot, F. L. H.0000-0001-6622-2907
Dauphas, N.0000-0002-1330-2038
Additional Information:© 2017 Lunar and Planetary Institute.
Group:Division of Geological and Planetary Sciences
Record Number:CaltechAUTHORS:20180618-105540474
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87189
Deposited By: Tony Diaz
Deposited On:18 Jun 2018 20:36
Last Modified:22 Nov 2022 20:33

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