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1. Interstellar Material in Meteorites: Implications for the Origin and Evolution of the Solar Nebula

Published online by Cambridge University Press:  12 April 2016

R. N. Clayton

Abstract

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Several isotopie anomalies, unexplained by known nuclear or non-nuclear processes within the solar system have been attributed to the preservation of pre-solar variations. The largest of these (in number of atoms) in an 16O-excess (up to 5%) in “high-temperature condensate” minerals in primitive meteorites. Some of these same minerals have an excess of 26Mg, probably a decay product of 26Al, that could have been a major source of heat for melting and metamorphosing planetesimals. Excesses of 22Ne and of isotopes of Xe, found in carbonaceous chondrites, may have origins in presolar solid particles. Large variation in the isotopie abundances of nitrogen and carbon in meteorites may also represent isotopie heterogeneity in the solar nebula. Most of these “Isotopically anomalous” elements are found to be highly concentrated in minute phases within the meteorites, rather than being uniformly distributed. The identification and characterization of these carriers of presolar materials constitutes the principal thrust of current research in this area.

Type
Part VI. Primitive Meteorites
Information
International Astronomical Union Colloquium , Volume 39: Comets, Asteroids, Meteorites: Interrelations, Evolution and Origins , December 1977 , pp. 335 - 341
Copyright
Copyright © A.H. Delsemme 1977

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