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Proc. Natl. Acad. Sci. USA Vol. 95, pp. 90879092, August 1998

Summary: Proc. Natl. Acad. Sci. USA
Vol. 95, pp. 90879092, August 1998
A model to explain the various paradoxes associated with mantle
noble gas geochemistry
Seismological Laboratory 252-21, California Institute of Technology, Pasadena, CA 91125
Contributed by Don L. Anderson, June 15, 1998
ABSTRACT As a result of an energetic accretion, the
Earth is a volatile-poor and strongly differentiated planet. The
volatile elements can be accounted for by a late veneer ( 1%
of total mass of the Earth). The incompatible elements are
strongly concentrated into the exosphere (atmosphere,
oceans, sediments, and crust) and upper mantle. Recent
geochemical models invoke a large primordial undegassed
reservoir with chondritic abundances of uranium and helium,
which is clearly at odds with mass and energy balance
calculations. The basic assumption behind these models is
that excess ``primordial'' 3
He is responsible for 3


Source: Anderson, Don L. - Division of Geological and Planetary Sciences, California Institute of Technology


Collections: Geosciences