Research results indicate that the precursor materials of the Isua rocks were derived from material that differentiated from the silicate mantle within 50 Ma of the start of the Solar System. It was also discovered that all modern terrestrial rocks have an excess of 142Nd, but not the chondritic meteorites. This excess of 142Nd indicates that the silicate Earth must have experienced a global differentiation within 50 Ma of the start of the Solar System.
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