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Within the belt of tin granites, the tectonic setting is more complicated than might appear at first glance. Formation of different phases of granite was confined to certain periods in the tectonic history of the belt.

Reconstruction of the paleotectonic scene for periods as old as Permian has been attempted, and the formation of each phase of granite has been related to a particular tectonic setting. It is clear that both "S-type" and "I-type" granites are present throughout the country and that probably the younger, Upper Cretaceous-Tertiary, "S-type" granites are the most important for tin mineralization. Their origin appears to be connected with the remelting of crustal material during the subduction that resulted from the collision of the Indian and Eurasian plates in Late Cretaceous-Tertiary time.

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