Journal of Petrology Volume 41 Number 12 Pages 1821 2000
© Oxford University Press 2000
Encyclopedia of Geochemistry, edited by Clare P. Marshall and Rhodes W. Fairbridge. Kluwer Academic, Dordrecht, 1999, 712 pp. ISBN 0-421-75500-9. £280.
Geochemistry has been in the vanguard of what many have described
as the second major revolution in the Earth Sciences. The development
of plate tectonic theory marked the profound shift in emphasis
from description of what was preserved in the geological record,
to investigations of the processes responsible. Understanding
of processes in turn requires the best possible estimates of
when and how fast they took place. In very many instances what
we
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