Abstract
This chapter is a synthesis of geological setting, geochemistry, and zircon U–Pb ages of the oldest (Paleoarchean to Mesoarchean) granitoids of the Singhbhum and Western Dharwar cratons, India. It discusses the petrogenesis of these granitoids in terms of source compositions and source melting conditions. The chapter provides a broader perspective on different stages of juvenile crustal addition and crustal reworking in these cratons, tectonic significance of the granitoids and associated greenstone belts, and the processes that operated within the lithosphere. The mechanism of formation of early continental crust and the relative role of vertical and horizontal tectonics are discussed. It is concluded that both cratons show dominance of vertical tectonics (dome-and-basin structures), and their geological features are more consistent with crustal growth within thick volcanic plateau related to upwelling mantle.
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