Vestige of a Beginning: a Quest for 142Nd Anomalies in the Earth
Although seismic tomography evidence leaves no room for fully layered mantle convection, it is still arguable that over Earth's history convection has efficiently homogenized mantle composition. We first searched for remains of the early differentiation of the planet in the 3.8 Ga rocks from Isua, Greenland. A sensitive indicator is the extinct
Boyet, M. et al.
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2002