Constraints on the differentiation of the Earth from the coupled Sm-146,147-Nd-142,143 systematics

Details Constraints on the differentiation of the Earth from the coupled Sm-146,147-Nd-142,143 systematics Constraints on the differentiation of the Earth from the coupled Sm-146,147-Nd-142,143 systematics

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..709j&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M p 709-710 (SEE N94-16173 03-91)

Physics

Earth Crust, Earth Mantle, Geodynamics, Magma, Neodymium Isotopes, Samarium Isotopes, Geochronology, Moon, Tectonics

Scientific paper

The coupled Sm-Nd systematics are a powerful (albeit analytically challenging) tool for investigating the geodynamic history of the Earth. We have previously reported evidence for a 33 ppm difference of an Isua sample relative to our terrestrial standard. Interpretation yields a formation age range for the depleted mantle (DM) source reservoir of 4.45-4.55 Ga. This is consistent with an epoch of LREE-enriched melt extraction from the mantle (proto-crust formation), soon after magma ocean freeze-up following the putative Moon forming giant impact.

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