lotrite

In the ocean basin spreading stage of Middle Silurian, it formed a increase metamorphic charateristics with lotrite facies→low green schist facies→hornblende facies.

中志留世末洋盆扩张阶段，形成、相→低片岩相→角闪岩相的递增变特征；

7.In the ocean basin spreading stage of Middle Silurian,it formed a increase metamorphic charateristics with lotrite facies→low green schist facies→hornblende facies.

中志留世末洋盆扩张阶段 ,形成、相→低片岩相→角闪岩相的递增变特征 ;