Three deep major faults are well developed in Changling rift and they significantly control the post-Cretaceous sedimentary and tectonic evolution.Zircon U-PB dating of the volcanic rock samples from wells reveals that the interme-diate-mafic volcanic rocks in Changling rift were formed in the early Yingcheng period

and the overlying acidic volcanic rocks were formed in the late Yingcheng period.The strata between these two sets of volcanic rocks should be deposited during the middle Yingcheng period.During rifting

two rifted lacustrine basins occurred in the Huoshiling and Yingcheng periods respectively and their distributions and controlling factors are different.During the Huoshiling period

the NE-trending major axis direction of the Changling rift was controlled by Xin'anzhen-honggang fault in the west and Changchun-da'an faults in the east

and the discovered resource abundance is high.In contrast

during the Yingcheng period

the NS-trending major axis of the Changling rift was jointly controlled by the early faults and the concordant faults in dipping axis direction

and the discovered resource abundance is low.Under the joint control of the pre-existing deep major faults and cap rocks

the complex structures in the study area are characterized by harmonization and diversity in space

and unity and order in time.