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内蒙土贵乌拉地区广泛分布着太古代麻粒岩相深变质岩系,笔者通过大量野外工作和室内研究,恢复其原岩为一套火山岩为主的火山──沉积岩系。其中火山岩大部分属〔CA〕系列,因此,推断它们形成于岛弧或活动大陆边缘。
The Archean granulite-deep metamorphic rock series is widely distributed in the Tugui-Wula area of Inner Mongolia. The author has recovered a large number of volcanic rocks--sedimentary rocks by extensive fieldwork and laboratory studies. Most of these volcanic rocks belong to the [CA] series, so it is inferred that they formed on the island arc or on the active continental margin.