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Presolar graphitic carbon spherules; rocks from stars

T. Kevin Croat, Thomas J. Bernatowicz and Tyrone L. Daulton
Presolar graphitic carbon spherules; rocks from stars (in Graphitic carbon, Olivier Beyssac (editor) and Douglas Rumble (editor))
Elements (December 2014) 10 (6): 441-446


Graphitic carbon spherules found in primitive meteorites have large carbon isotope anomalies, indicating that they are carbonaceous stardust (also known as presolar grains) expelled from dying stars prior to the formation of the Sun. Presolar spherules show varying degrees of graphitization, ranging from poorly graphitic, turbostratic layers in low-density spherules to well-crystallized graphitic outer shells in high-density ones, and some spherules also contain a polycrystalline phase in their core. Within the spherules, grains of other refractory phases (including carbides and metals) are common, and these assemblages can be studied as one would study a rock. The isotopic and microstructural information available from these presolar graphitic assemblages gives insights into nucleosynthesis and grain condensation in late-stage carbon-rich stars.

ISSN: 1811-5209
Serial Title: Elements
Serial Volume: 10
Serial Issue: 6
Title: Presolar graphitic carbon spherules; rocks from stars
Title: Graphitic carbon
Author(s): Croat, T. KevinBernatowicz, Thomas J.Daulton, Tyrone L.
Author(s): Beyssac, Oliviereditor
Author(s): Rumble, Douglaseditor
Affiliation: Washington University, Laboratory for Space Sciences and Department of Physics, St. Louis, MO, United States
Affiliation: Universite Paris VI-Sorbonne, Departement de Mineralogie, de Physique des materiaux, et de Cosmochimie, Paris, France
Pages: 441-446
Published: 201412
Text Language: English
Publisher: Mineralogical Society of America and Mineralogical Society of Great Britain and Ireland and Mineralogical Association of Canada and Geochemical Society and Clay Minerals Society, International
References: 35
Accession Number: 2015-007790
Categories: Extraterrestrial geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Carnegie Institution of Washington, USA, United States
Country of Publication: International
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201504
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