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Science 20 February 1998:
Vol. 279. no. 5354, pp. 1178 - 1181
DOI: 10.1126/science.279.5354.1178
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Reports

Rare Gas Systematics in Popping Rock: Isotopic and Elemental Compositions in the Upper Mantle

Manuel Moreira, Joachim Kunz, Claude Allègre

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.

Université Denis Diderot-Paris 7, Laboratoire de Géochimie et Cosmochimie, Institut de Physique du Globe de Paris, CNRS Unité de Recherche Associée Number 1758, 4 Place Jussieu, 75252 Paris Cedex 05, France. E-mail: moreira{at}ipgp.jussieu.fr

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