Abstract
Global observations show that the crustal thickness varies through the tectonic regions. While the continental crust is 30–70km thick, the oceanic crustal thickness is 6–12km. The oceanic crust is also denser (2.8–3.0g/cm3) than the continental crust (2.6–2.7g/cm3). The average Archean crust is ~35km thick, whereas the Proterozoic crust is significantly thicker (~45km). The nature of the Moho is also not quite consistent; at a few places it is a sharp boundary, whereas at most of the other places it is diffused. A number of models exist to describe the global crust in diverse geological terrains. Since the Indian shield is a mosaic of diverse terrane bearing the imprints of various tectonic episodes in geological history, from Archean to the late Proterozoic eon, the crust is heterogeneous in nature.
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