在变质作用中，菱铁矿在较高温度和压力下转变成磁铁矿，其他含铁碳酸盐转变成夕卡岩。
During metamorphization the siderite is transformed into magnetite under the action of high temperature and high pressure, while other Fe-bearing carbonate rocks are changed in to skarns.
发生变质作用的地方，压力和温度要高于成岩作用。但二者间并未建立起清晰的界线。
The pressures and temperatures at which metamorphism occurs are higher than those of diagenesis, but no clear boundary between the two has been established.
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