Publication Date:
2004-02-14
Description:
Rare earth element (REE) data from two ordinary chondrite chondrules show distinct negative chondrite-normalized concentration anomalies of samarium, europium, and ytterbium. The peculiar patterns may be the result of REE gas/solid fractionation at an oxygen fugacity lower than has been assumed for the canonical solar nebula. We suggest that the two ordinary chondrite chondrules acquired the fractionated REE patterns by incorporation of highly reduced, ultrarefractory condensates in their precursors. This interpretation implies that high-temperature condensation processes occurred in nebular environments with a strong deficit in oxygen, such as regions with an enhanced carbon/oxygen ratio.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pack, Andreas -- Shelley, J Michael G -- Palme, Herbert -- New York, N.Y. -- Science. 2004 Feb 13;303(5660):997-1000.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut fur Mineralogie und Geochemie, Universitat Koln, Zulpicher Strasse 49b, D-50674 Koln, Germany. apack@crpg.cnrs-nancy.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14963326" target="_blank"〉PubMed〈/a〉
Keywords:
*Carbon
;
Europium
;
*Lanthanoid Series Elements
;
*Meteoroids
;
*Oxygen
;
Samarium
;
*Solar System
;
Ytterbium
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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