The Mg-rich volcanic rock(pyroxene andesite) is also found in the Baitashan Formation of Middle Devonian series of the Saerbulake area, whixh is a typical boninite formed in the forearc setting.

• 沙尔布拉克中泥盆统北塔山组中也含有富镁火岩-辉石安山岩，它是典型的玻镁安山岩，其形成环境为前弧。