摘要
The North China area is characterized by rifting and rift trenches developed during the Proterozoic, including the Yanliao rift trench, which started forming at 1.8Ga, and the Wumishan Formation, which was deposited during the middle Mesoproterozoic （Cui et al., 2000; Wang et al., 1995）. The rift trough was formed last.
The North China area is characterized by rifting and rift trenches developed during the Proterozoic, including the Yanliao rift trench, which started forming at 1.8Ga, and the Wumishan Formation, which was deposited during the middle Mesoproterozoic （Cui et al., 2000; Wang et al., 1995）. The rift trough was formed last.
