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Science 5 May 2000:
Vol. 288. no. 5467, pp. 845 - 847
DOI: 10.1126/science.288.5467.845
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Reports
40K-40Ar Constraints on Recycling Continental Crust into the Mantle
Nicolas Coltice,
Francis Albarède,
Philippe Gillet
Extraction of potassium into magmas and outgassing of argon during
melting constrain the relative amounts of potassium in the crust with
respect to those of argon in the atmosphere. No more than 30% of the
modern mass of the continents was subducted back into the mantle during
Earth's history. It is estimated that 50 to 70% of the subducted
sediments are reincorporated into the deep continental crust. A
consequence of the limited exchange between the continental crust and
the upper mantle is that the chemistry of the upper mantle is driven by
exchange of material with the deep mantle.
Laboratoire des Sciences de la Terre, Ecole Normale
Supérieure, 69364 Lyon cedex 7, France.
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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
- The contemporary degassing rate of 40Ar from the solid Earth.
- M. L. Bender, B. Barnett, G. Dreyfus, J. Jouzel, and D. Porcelli (2008)
PNAS
105, 8232-8237
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- Global modelling of continent formation and destruction through geological time and implications for CO2 drawdown in the Archaean Eon.
- J. D. Kramers (2002)
Geological Society, London, Special Publications
199, 259-274
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