Publication Date:
2000-11-10
Description:
Ion microprobe analyses show that solar wind nitrogen associated with solar wind hydrogen implanted in the first tens of nanometers of lunar regolith grains is depleted in 15N by at least 24% relative to terrestrial atmosphere, whereas a nonsolar component associated with deuterium-rich hydrogen, detected in silicon-bearing coatings at the surface of some ilmenite grains, is enriched in 15N. Systematic enrichment of 15N in terrestrial planets and bulk meteorites relative to the protosolar gas cannot be explained by isotopic fractionation in nebular or planetary environments but requires the contribution of 15N-rich compounds to the total nitrogen in planetary materials. Most of these compounds are possibly of an interstellar origin and never equilibrated with the 15N-depleted protosolar nebula.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hashizume, K -- Chaussidon, M -- Marty, B -- Robert, F -- New York, N.Y. -- Science. 2000 Nov 10;290(5494):1142-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre de Recherches Petrographiques et Geochimiques-CNRS, BP 20, 54501 Vandoeuvre-les-Nancy Cedex, France. kohash@ess.sci.osaka-u.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11073449" target="_blank"〉PubMed〈/a〉
Keywords:
Argon
;
Deuterium
;
Extraterrestrial Environment
;
Hydrogen
;
Isotopes
;
*Moon
;
*Nitrogen
;
Nitrogen Isotopes
;
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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