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1.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 ,形成葡萄石、绿纤石相→低绿片岩相→角闪岩相的递增变质特征 ;收藏指正
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