Christopher Hawkesworth coauthored work distinguishing the generation of new continental crust from reworking and preservation of older material. Age distributions and isotope ratios help identify those different contributions.[ref]
Rates of generation and growth of the continental crust by Christopher Hawkesworth and others. Abstract: heterogeneous age record, isotopic evidence and reworking
A peak in preserved crystallization ages need not represent a matching peak in net crustal growth. Some material is remelted or destroyed, so reconstructing continental volume requires both production and loss in the mass budget.
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