These Devonian volcanics were resulted from the subduction of oceanic lithosphere basin (between Heiying Mountains and Hula Mountains) in south rim of South Tianshan to the north in early Devonian.

• 该套火山岩由于南天山南缘洋盆（黑英山-虎拉山间的洋盆）在早泥盆世中期向北俯冲而成。