Publication Date:
2002-02-09
Description:
Carbonaceous chondrite condensate olivine grains from two distinct petrographic settings, calcium-aluminum-rich inclusion (CAI) accretionary rims and amoeboid olivine aggregates (AOAs), are oxygen-16 (16O) enriched at the level previously observed inside CAIs. This requires that the gas in the nebular region where these grains condensed was 16O-rich. This contrasts with an 16O-poor gas present during the formation of chondrules, suggesting that CAIs and AOAs formed in a spatially restricted region of the solar nebula containing 16O-rich gas. The 16O-rich gas composition may have resulted either from mass-independent isotopic chemistry or from evaporation of regions with enhanced dust/gas ratios, possibly in an X-wind environment near the young Sun.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Krot, Alexander N -- McKeegan, Kevin D -- Leshin, Laurie A -- MacPherson, Glenn J -- Scott, Edward R D -- New York, N.Y. -- Science. 2002 Feb 8;295(5557):1051-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, HI 96822, USA. sasha@higp.hawaii.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11834830" target="_blank"〉PubMed〈/a〉
Keywords:
Aluminum/analysis
;
Calcium/analysis
;
Cosmic Dust
;
Evolution, Chemical
;
Gases
;
Iron Compounds
;
Magnesium Compounds
;
*Meteoroids
;
Minerals/analysis
;
Oxygen/*analysis
;
Oxygen Isotopes/analysis
;
Silicates
;
*Solar System
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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