A Neoarchean-Proterozoic Supercontinent (～2.8-0.9 Ga): An Alternative to the Model of Supercontinent Cycles

摘要

The model of supercontinent cycles is revisited on the basis of reevaluation of existing ideas on the geodynamics and tectonics of granulite gneiss belts and areals. Granulite-gneiss belts and areals of a regional scale correspond to mantle-plume (superplume) activity and form the major components of intracontinental orogens. The evolution of geodynamic settings of the Earth's crust origin can be imagined as a "spiral sequence": (1) interaction of mantle plumes and "embryonic" microplate tectonics during the Paleo- Mesoarchean (3.80-2.75 Ga); (2) plume-tectonics and local plume-driven plate-tectonics within supercontinent during Neoarchean and Proterozoic (2.75-0.85 Ga); (3) plate tectonics in the Phanerozoic along with a reduced role of mantle plumes starting from 0.85 Ga.