一种纹理清晰的变质岩，由石英、长石、云母和其他矿物组成，因侵入岩对沉积岩，特别是页岩的作用而形成。
A fine-grained metamorphic rock composed of quartz, feldspar, mica, and other minerals, formed by the action of intrusive rock upon sedimentary rock, especially shale.
该矿床属于受含铁沉积建造及变质作用控制的变质沉积型矿床。
This deposit belongs to metamorphic sedimentary type which is controlled by iron-bearing sedimentary construction and metamorphism.
原岩恢复以及对变质作用过程中可能发生的变质反应的理论探讨和原始沉积物理想组分计算的结果都支持上述结论。
Protolith restoration, theoretical analysis for the reactions involved in the process of metamorphism, and calculations all support the above conclusion.
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