Mathematics – Logic
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..80..299n&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 80, no. 3-4, Nov. 1986, p. 299-313.
Mathematics
Logic
98
Basalt, Earth Core, Geochemistry, Lead Isotopes, Ocean Bottom, Planetary Evolution, Cerium, Earth Mantle, Neodymium Isotopes, Strontium Isotopes, Trace Elements
Scientific paper
The hypothesis that the mantle Pb isotope ratios reflect continued extraction of Pb into the earth's core over geologic time is evaluated by studying the depeletion of chalcophile and siderophile elements in the mantle. Oceanic basalt samples are analyzed in order to determine the Pb, Sr, and Nd isotropic compositions and the abundances of siderophile and chalcophile elements and incompatible lithophile elements. The data reveal that there is no systematic variation of siderophile or chalcophile element abundances relative to abundances of lithophile elements and the Pb/Ce ratio of the mantle is constant. It is suggested that the crust formation involves nonmagmatic and magmatic processes.
Hofmann Albrecht W.
Jochum Klaus Peter
Newsom Horton E.
White William M.
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