Oxygen Isotopes in Refractory Stratospheric Dust Particles: Proof of Extraterrestrial Origin
Oxygen Isotopes in Refractory Stratospheric Dust Particles: Proof of Extraterrestrial Origin
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难熔平流层尘埃粒子中的氧同位素：地外起源的证据
DOI：
10.1126/science.237.4821.1468
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发表时间：
1987
期刊：
影响因子：
56.9
通讯作者：
K. McKeegan
中科院分区：
文献类型：
--
作者：
K. McKeegan
用二次离子质谱仪测定了从平流层采集的5个含难熔矿物的颗粒物的氧和镁同位素组成。其中四个颗粒表现出过量的氧-16，类似于在碳质球粒陨石的无水矿物相中观察到的，因此是外星的。一个富含刚玉的颗粒的氧和镁同位素丰度与陆地来源一致。这四个外星粒子中的镁在同位素上是正常的。这些颗粒不太可能来自碳质球粒陨石，因此这些颗粒很可能代表了一种新类型的收集到的外星物质。
The oxygen and magnesium isotopic compositions of five individual particles that were collected from the stratosphere and that bear refractory minerals were measured by secondary ion mass spectrometry. Four of the particles exhibit excesses of oxygen-16 similar to those observed in anhydrous mineral phases of carbonaceous chondrites and thus are extraterrestrial. The oxygen and magnesium isotopic abundances of one corundum-rich particle are consistent with a terrestrial origin. Magnesium in the four extraterrestrial particles is isotopically normal. It is unlikely that these particles are derived from carbonaceous chondrites and thus such particles probably represent a new type of collected extraterrestrial material.