The spilite-keratophyre suite, closely associated with the alpine-type ultrabasic intrusives in this region, constitutes a typical ophiolite suite.

• 主要由细碧质、少量角斑质、石英角斑质火山熔岩及火山碎屑岩组成,并夹有硅质板岩、泥质板岩、千枚岩、片岩等海相沉积岩层及灰岩透镜体。