Residence time of thorium, uranium and lead in the mantle with implications for mantle convection

Details Residence time of thorium, uranium and lead in the mantle with implications for mantle convection Residence time of thorium, uranium and lead in the mantle with implications for mantle convection

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.316..778g&link_type=abstract

Nature (ISSN 0028-0836), vol. 316, Aug. 29, 1985, p. 778-782. Research supported by the Royal Society and NERC.

Physics

85

Convection, Earth Mantle, Geochronology, Radioactive Isotopes, Geochemistry, Lead Isotopes, Mass Transfer, Planetary Evolution, Steady State, Thorium Isotopes, Uranium Isotopes

Scientific paper

The residence times of thorium, uranium, and lead in the upper mantle are estimated at less than about 600 Myr, and should be similar for related elements that are strongly concentrated in the continental lithosphere. Their upper mantle abundances are close to steady state and are mostly supported by entrainment of material from a lower mantle layer with long-term convective isolation. These lithophile trace elements and rare gases, such as He-3, are effective chemical probes of the deeper mantle.

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