Document Detail

Contemporaneous formation of chondrules and refractory inclusions in the early Solar System.
MedLine Citation:
PMID:  12802328     Owner:  NLM     Status:  MEDLINE    
Chondrules and calcium-aluminium-rich inclusions (CAIs) are preserved materials from the early history of the Solar System, where they resulted from thermal processing of pre-existing solids during various flash heating episodes which lasted for several million years. CAIs are believed to have formed about two million years before the chondrules. Here we report the discovery of a chondrule fragment embedded in a CAI. The chondrule's composition is poor in 16O, while the CAI has a 16O-poor melilite (Ca, Mg, Al-Silicate) core surrounded by a 16O-rich igneous mantle. These observations, when combined with the previously reported CAI-bearing chondrules, strongly suggest that the formation of chondrules and CAIs overlapped in time and space, and that there were large fluctuations in the oxygen isotopic compositions in the solar nebula probably synchronizing astrophysical pulses.
Shoichi Itoh; Hisayoshi Yurimoto
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Nature     Volume:  423     ISSN:  0028-0836     ISO Abbreviation:  Nature     Publication Date:  2003 Jun 
Date Detail:
Created Date:  2003-06-12     Completed Date:  2003-07-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  728-31     Citation Subset:  IM    
Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan.
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MeSH Terms
Aluminum Silicates / analysis*
Calcium / analysis*
Extraterrestrial Environment / chemistry*
Magnesium / analysis*
Oxygen / analysis*
Oxygen Isotopes
Solar System*
Reg. No./Substance:
0/Aluminum Silicates; 0/Oxygen Isotopes; 7439-95-4/Magnesium; 7440-70-2/Calcium; 7782-44-7/Oxygen
Comment In:
Nature. 2003 Jun 12;423(6941):691-2   [PMID:  12802314 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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