The Shanggang pluton is composed of 2.71–2.69 Ga tonalite and 2.67–2.61 Ga trondhjemite.
The 2.67–2.66 Ga trondhjemite is derived from the re-working of older crustal materials.
The 2.67–2.60 Ga magmatism is related to the compositional differentiation of the Archean continental crust.