Archean upper crust transition from mafic to felsic marks the onset of plate tectonics by Ming Tang and others (2016, 10.1126/science.aad5513)

Authors: Ming Tang, Kang Chen, Roberta L. Rudnick.

Science 351, 372–375. Uses Ni/Co and Cr/Zn ratios to infer a change in upper continental crust composition during the Archean; the inferred timing of global plate tectonics is an interpretation.