Moreira M, Kunz J, Allegre C
Universite Denis Diderot-Paris 7, Laboratoire de Geochimie et Cosmochimie, Institut de Physique du Globe de Paris, CNRS Unite de Recherche Associee Number 1758, 4 Place Jussieu, 75252 Paris Cedex 05, France. E-mail:
Science. 1998 Feb 20;279(5354):1178-81. doi: 10.1126/science.279.5354.1178.
New experimental data on the isotopic variations of neon, argon, and xenon in a popping rock imply that the 40Ar/36Ar ratio of the upper mantle is less than 44,000 and that the 129Xe/130Xe ratio is less than 8.2. The elemental abundance pattern of rare gases is chondritic-like and is quite distinct from the solar pattern. These data imply that Earth accreted from planetesimals that probably underwent a transformation of their rare gas budget from solar- to chondritic-like, leaving the isotopic composition unchanged from the solar pattern.
一块爆裂岩石中氖、氩和氙同位素变化的新实验数据表明，上地幔的40Ar/36Ar比率小于44000，129Xe/130Xe比率小于8.2。稀有气体的元素丰度模式类似球粒陨石，与太阳模式截然不同。这些数据意味着地球是由小行星吸积形成的，这些小行星的稀有气体预算可能经历了从太阳模式到球粒陨石模式的转变，而同位素组成则保持与太阳模式不变。
