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Is "Primordial" Helium Really Extraterrestrial?

Farley, K. A. (1993) Is "Primordial" Helium Really Extraterrestrial? Science, 261 (5118). pp. 166-167. ISSN 0036-8075.

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Among the isotope systems exploited by mantle geochemists to deduce the chemical evolution of the Earth, those of the rare gases are unique because they record the migration of volatile species from the mantle to the atmosphere. The isotopic composition of helium in mantle-derived rocks is now reasonably well known, and it suggests that this migration has been both more heterogeneous and less extensive than commonly expected. The implications of the helium data are profound, but they seem to conflict with widely held beliefs derived from other geochemical tracers, including the isotopic characteristics of lithophile elements (that is, elements such as Sr, Nd, and Pb found predominantly in Earth's silicate rust). Although the geochemical processes affecting the rare gases and lithophile species must be intimately related, it has proven difficult to reconcile them in any obvious way. On page 170 of this issue, Anderson offers a controversial hypothesis that can simultaneously explain all of these disparate tracers (1). If he is correct, a dramatic reinterpretation of the terrestrial rare gas data and their significance to planetary evolution is required.

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Farley, K. A.0000-0002-7846-7546
Additional Information:© 1993 American Association for the Advancement of Science.
Issue or Number:5118
Record Number:CaltechAUTHORS:20130506-150523245
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Official Citation:Is "Primordial" Helium Really Extraterrestrial? K. A. Farley Science 9 July 1993: 261 (5118), 166-167. [DOI:10.1126/science.261.5118.166]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38300
Deposited By: Tony Diaz
Deposited On:07 May 2013 23:42
Last Modified:03 Mar 2020 13:01

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