The Precambrian period granites are relatively few in South China

and they mainly belong to Neoproterozoic.From the previous studies

we can get the result that there are some commons in Neoproterozoic granite in south of China:they belong to eraluminous-strong peraluminous granites

and the age is about 800-830 Ma.Most of them are S-type granite

and few are I or I-S-type. They formed from the material of the old crust

and they may result from the collision

subduction and mantle plume activity.