该区的碰撞造山作用主要发生在石炭纪和二叠纪，并经历了先挤压后伸展的演化过程。
The collisional orogenesis in the area occurred in the Carboniferous and Permian, and shows the character of the early compression and late extension.
采用仪器中子活化分析法(INAA)测定了华北晚古生代石炭纪-二叠纪58个煤及煤层夹矸和顶底板样品的稀土元素含量。
An INAA (Instrumental Neutron Activation Analysis) method was used to determine the abundance of rare-earth elements in 58 late Palaeozoic coals and related rocks in North China.
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