Oil & Gas Geology ›› 2013, Vol. 34 ›› Issue (2): 229-235.doi: 10.11743/ogg20130214

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Structural characteristics and post-Cretaceous tectonic evolution of the Changling Rift

Hu Chunxin   

  1. Northeast Oil and Gas Branch, SINOPEC, Changchun, Jilin 130061, China
  • Received:2012-07-17 Revised:2013-03-02 Online:2013-04-28 Published:2013-05-02

Abstract:

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.

Key words: volcanic rock, structural characteristics, tectonic evolution, deep major fault, Changling Rift

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