Evidence from coupled (Sm-147)-(Nd-143) and (Sm-146)-(Nd-142) systematics for very early (4.5-Gyr) differentiation of the earth's mantle

Details Evidence from coupled (Sm-147)-(Nd-143) and (Sm-146)-(Nd-142) systematics for very early (4.5-Gyr) differentiation of the earth's mantle Evidence from coupled (Sm-147)-(Nd-143) and (Sm-146)-(Nd-142) systematics for very early (4.5-Gyr) differentiation of the earth's mantle

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.360..728h&link_type=abstract

Nature (ISSN 0028-0836), vol. 360, no. 6406, p. 728-732.

Physics

46

Earth Crust, Earth Mantle, Half Life, Neodymium Isotopes, Samarium Isotopes, Rare Earth Elements, Silicates, Solar System Evolution

Scientific paper

Evidence for early differentiation of the earth's mantle is presented based on measurements of Nd-143/Nd-144 and Nd-142/Nd-144 ratios in an approximately 3.8 Gyr-old supracrustal rock from Isua, West Greenland. Coupled (Sm-146,147)-(Nd-142,143) systematics suggest that the fractionation of Sm/Nd took place 4.44-4.54 Gyr ago, due to extraction of a light rare earth element-enriched primordial crust.

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