Publication Date:
2007-06-16
Description:
Oxygen isotopic composition of our solar system is believed to have resulted from mixing of two isotopically distinct nebular reservoirs, 16O-rich and (17,18)O-rich relative to Earth. The nature and composition of the (17,18)O-rich reservoir are poorly constrained. We report an in situ discovery of a chemically and isotopically unique material distributed ubiquitously in fine-grained matrix of a primitive carbonaceous chondrite Acfer 094. This material formed by oxidation of Fe,Ni-metal and sulfides by water either in the solar nebula or on a planetesimal. Oxygen isotopic composition of this material indicates that the water was highly enriched in 17O and 18O (delta(17,18)O(SMOW) = +180 per thousand per mil), providing the first evidence for an extremely (17,18)O-rich reservoir in the early solar system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sakamoto, Naoya -- Seto, Yusuke -- Itoh, Shoichi -- Kuramoto, Kiyoshi -- Fujino, Kiyoshi -- Nagashima, Kazuhide -- Krot, Alexander N -- Yurimoto, Hisayoshi -- New York, N.Y. -- Science. 2007 Jul 13;317(5835):231-3. Epub 2007 Jun 14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Natural History Sciences, Hokkaido University, Sapporo 060-0810, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17569827" target="_blank"〉PubMed〈/a〉
Keywords:
*Meteoroids
;
Oxidation-Reduction
;
Oxygen/*analysis
;
Oxygen Isotopes/*analysis
;
*Solar System
;
Water/*chemistry
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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