Archean upper crust transition from mafic to felsic marks the onset of plate tectonics by Ming Tang and others 2026-10-25
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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.
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Nature and composition of the continental crust: A lower crustal perspective by Roberta L. Rudnick and David M. Fountain 2026-10-25
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Reviews of Geophysics 33, 267–309. Synthesizes seismic, geochemistry and petrological evidence for heterogeneous upper, middle and lower continental crust.
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