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Efforts to search for 142 Nd excesses in ancient rocks with high apparent εNd143 over 10 years ago yielded conflicting results and indicated that better mass spectrometers/techniques needed to be devised to resolve the anomalies. Recent searches again give apparently conflicting data: Caro et al. [Caro, G., Bourdon, B., Birck, J.L., Moorbath, S., 2003. 146 Sm– 142 Nd evidence...
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