在中级变质时形成云母片岩；在高级变质作用下形成片麻岩。
Some examples of metamorphic rocks are gneiss, slate, marble, schist and quartzite.
经岩石化学及微量元素等的研究表明，这是一个由贫硅富铝的沉积岩经高级变质作用形成的矿床。
Based on the investigation by petrochemistry and trace elements, It is regarded that this corundum deposit are formed…
经岩石化学及微量元素等的研究表明，这是一个由贫硅富铝的沉积岩经高级变质作用形成的矿床。
Based on the investigation by petrochemistry and trace elements, It is regarded that this corundum deposit are formed…
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