Solar wind record on the moon: Deciphering presolar from planetary nitrogen

被引:138
作者
Hashizume, K
Chaussidon, M
Marty, B
Robert, F
机构
[1] Ctr Rech Petrog & Geochim, F-54501 Vandoeuvre Nancy, France
[2] Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Osaka 5600043, Japan
[3] INPL, Ecole Natl Super Geol, F-54501 Vandoeuvre Nancy, France
[4] Museum Natl Hist Nat, Lab Mineral, F-75005 Paris, France
关键词
D O I
10.1126/science.290.5494.1142
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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 N-15 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 N-15. Systematic enrichment of N-15 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 N-15-rich compounds to the total nitrogen in planetary materials. Most of these compounds are possibly of an interstellar origin and never equilibrated with the N-15-depleted protosolar nebula.
引用
收藏
页码:1142 / 1145
页数:4
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