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Some key issues in isotopic anomalies - Astrophysical history and aggregationAstrophysical history, particularly that period extending from stellar nucleosynthesis events to the formation of meteorites, is discussed as the key element for the understanding of isotopic anomalies in meteorites. The bulk homogeneity of the interstellar medium is considered, and it is argued that, despite the presence of spatial inhomogeneities due to different nucleosynthesis rates in different parts of the galaxy and supernova ejecta, a cosmic chemical memory of nucleosynthesis patterns, rather than an inhomogeneous injection, is the source of isotopic anomalies. According to this view, volatility patterns and some isotopic patterns are mapped onto a grain-size spectrum, and the FUN systematics may be explained by interstellar sputtering. Furthermore, meteoritic He and Ne abundances are inferred to be presolar, and the ubiquitous titanium isotopic anomalies are explained by processes of chemical fixation and condensation in varying environments.
Document ID
19820048265
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Clayton, D. D.
(Rice University Houston, TX, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1982
Subject Category
Astrophysics
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: Houston, TX
Start Date: March 16, 1981
End Date: March 20, 1981
Accession Number
82A31800
Funding Number(s)
CONTRACT_GRANT: NSG-7361
Distribution Limits
Public
Copyright
Other

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