Four stages of early Paleozoic magmatisms are recognized in the SZM.
Middle Cambrian monzogranites record the latest collision between the SZM and JM.
Late Cambrian A-type granitoids reveal a post-collision extensional setting.
Ordovician calc-alkaline igneous rocks record a northwestward subduction.
The SZM and JM have similar histories of Mesoproterozoic crustal accretion.