Abstract
Plate tectonics, as it operates in the modern earth, represents in a fundamental sense a mechanism by which excess thermal energy from the mantle is dissipated (Sclater et al., 1980). A substantial data base now exists concerning the operation of plate tectonics during Phanerozoic time, and evidence for similar tectonic activity during Proterozoic time appears to be steadily growing, both in quantity and quality. Concrete evidence for the operation of plate tectonics during Archean time is simply not available, but provocative similarities exist between certain important elements of Archean terrains and the lithologic assemblages generated by certain types of modern plate interaction.
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