Coupled 142Nd-143Nd Isotopic Evidence for Hadean Mantle Dynamics

Details Coupled 142Nd-143Nd Isotopic Evidence for Hadean Mantle Dynamics Coupled 142Nd-143Nd Isotopic Evidence for Hadean Mantle Dynamics

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sci...318.1907b&link_type=abstract

Science, Volume 318, Issue 5858, pp. 1907- (2007).

Computer Science

27

Scientific paper

The oldest rocks—3.85 billion years old—from southwest Greenland have coupled neodymium-142 excesses (from decay of now-extinct samarium-146; half-life, 103 million years) and neodymium-143 excesses (from decay of samarium-147; half-life, 106 billion years), relative to chondritic meteorites, that directly date the formation of chemically distinct silicate reservoirs in the first 30 million to 75 million years of Earth history. The differences in 142Nd signatures of coeval rocks from the two most extensive crustal relicts more than 3.6 billion years old, in Western Australia and southwest Greenland, reveal early-formed large-scale chemical heterogeneities in Earth’s mantle that persisted for at least the first billion years of Earth history. Temporal variations in 142Nd signatures track the subsequent incomplete remixing of very-early-formed mantle chemical domains.

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