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本文试图从与变质作用有关的地壳内部热流的变化历史来讨论甘肃地壳演化过程和大地构造环境变化。一、变质单元与大地构造环境的变化变质作用类型的划分是以反映热流变化的变质相及变质相系(图1)为基础,结合变质作用发生和发展期间的大地构造环境进行的。因此,变质作用类型在时空上的变化反映了一定的大地构造环境的变迁,并表明变质作用与地壳演化的联系。变质作用类型(图2)的时空分布在变质地质图上表现为变质地带。相邻的变质地带有规律的组合在一起构成一级变质单元(称变质地区)。它们代表了一定地区变质作用类型随
This paper attempts to discuss the evolution of the crust and the tectonic environment in Gansu from the history of the heat flux in the crust associated with metamorphism. I. Metamorphic unit and tectonic environment change The classification of metamorphic type is based on metamorphic facies and metamorphic facies (Figure 1) which reflect the change of heat flux, combined with the tectonic environment during the metamorphism and development. Therefore, the variation of metamorphism type in time and space reflects the change of certain tectonic environment and indicates the relationship between metamorphism and crustal evolution. The metamorphism type (Figure 2) shows the temporal-spatial distribution of the metamorphic zone on the metamorphic geological map. Adjacent to the metamorphic zone with a regular combination of a metamorphic unit (known as the metamorphic area). They represent a certain area of metamorphism type