The garnets of M-type belong to pyrope mainly formed near the boundary between lithosphere and aesthenosphere under the megatemperature and ultrahigh pressure of Jinning or earlier orogeny.

• 型榴辉岩的石榴石属镁铝榴石，形成于晋宁期高温超高压条件下的岩石圈与软流圈交界附近。