Abstract
Nd and Sr isotopic compositions of young granitoid rocks from diverse locations show that none of them is derived from an oceanic mantle. Instead a large amount of recycled older continental crust must be involved in their genesis. In contrast old granitoids (older than 2,000 Myr) seem to have initial isotopic ratios of Nd and Sr quite close to the planetary mantle evolution line. These observations are interpreted as evidence of a quasi-continuous continental growth through geological time. We propose a mixing model to explain quantitatively the generation of granitoids from mantle and recycled continental materials.
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