Located in Taibus Banner of Inner Mongolia, the Yaowugou stock is a granite porphyry assuming a north-south spheroidal

form. The rock has porphyritic texture, and the minerals are mainly quartz, plagioclase, plagioclase and subordinately biotite.

As for chemical components, SiO2 is slightly lower than the average SiO2 value of granites, potassium is rich but sodium is poor,

FeO and CaO are very low, and aluminum is oversaturated. The rock has high differentiation index and high total REE. The values

of LREE are by far higher than the values of HREE, with a very weak negative Eu anomaly. All this indicates that the Yaowugou

stock should be genetically a S-type granite.