Short-Lived Chemical Heterogeneities in the Archean Mantle with Implications for Mantle Convection

Details Short-Lived Chemical Heterogeneities in the Archean Mantle with Implications for Mantle Convection Short-Lived Chemical Heterogeneities in the Archean Mantle with Implications for Mantle Convection

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994sci...263.1593b&link_type=abstract

Science, Volume 263, Issue 5153, pp. 1593-1596

Mathematics

Logic

14

Scientific paper

The neodymium isotope and samarium-neodymium systematics of 2.7-billion-year-old mantle-derived magmas indicate that the lifetime of chemical heterogeneities was much shorter in the Archean mantle than in the modern mantle. Isotopic evidence is compatible with a Rayleigh number 100 times larger and convection 10 times faster in the Late Archean compared with the present-day mantle. Modern plate tectonics thus may be an improbable analog for the Archean. Chemical heterogeneities in the mantle may originate upon magma migration and mineralogical phase changes rather than by recycling of oceanic and continental crust.

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