The Yushugou mafic granulites underwent HP and HT metamorphism and deformation during the subduction of mid-oceanic ridge.
Protoliths of the mafic granulites were probably derived from seamount at the mid-oceanic ridge of the South Tianshan Ocean.
The mafic granulites have protolith age of ca. 400 Ma and metamorphic age of 390–360 Ma.
The NAMs of the granulites contain certain but trace amounts of water.