Re-understanding of the rising and falling Interface of each stage of Neoproterozoic period in Liaoning Province
This paper is the result of regional geology.[Objective]Liaoning area is located in the northeast margin of the North China plate.The traditional view is that Liaoning area has been in a period of tectonic stability from the Lv Liang-Sibao movement to the end of the Paleozoic era and has not been affected by the obvious tectonic movement.However,In recent years,the results show that the Neoproterozoic tectonic movement in Liaoning area is relatively frequent.According to the weathering-planation surface confirmed by Liaoning 1∶250 000 Dalian regional surveys(2001),the tectonic movement in Neoproterozoic period in Liaoning Province was collectively called Jinning Movement,and divided into four sub-tectonic movements,namely,Wanfu vertical movement(equivalent to Qinyu vertical movement),Tuoshan vertical movement,Chayegou vertical movement and Dalian vertical movement.Among them,There is an inaccuracy in the classification and definition of the vertical movements of Tuoshan vertical movement and Chayegou vertical,and their naming needs further research and exploration.[Methods]This paper takes the Neoproterozoic strata in Liaoning Province as the research object,based on regional geological survey data and combined with chronological data,to redefine the Neoproterozoic vertical movement in Liaoning Province.[Results]Through regional comparative research,two cycles of Jinning Movement and Dalian Movement,as well as seven sub level vertical movements,were identified,corresponding to three glaciation,two interglacial periods,and pre and post glacial periods.The seven sub level vertical movements are named Qinyu vertical movement,Yintun vertical movement,Dagushan vertical movement,Taizihe vertical movement,Fuzhou vertical movement,Nanguanling vertical movement,and Dalian vertical movement.The five sub level tectonic movements,including the Yintun vertical movement,Dagushan vertical movement,Taizihe vertical movement,Fuzhou vertical movement,and Nanguanling vertical movement,are collectively referred to as the Jinning movement,representing the early tectonic movement of the Neoproterozoic period.In the mid to late Neoproterozoic era(about 890-541 Ma),the strata above the original Xingmincun Formation were missing in the Liaoning region,representing the product of the uplift of the new tectonic movement.This movement is referred to as the Dalian Movement,which is similar to the Keping Movement in the northwest and the Chengjiang Movement in the south.The Qinyu lifting interface marks the end of the Sibao Movement and the beginning of the Jinning Movement.The sedimentary discontinuity between the Zhoujiaweizi Formation and Wangjiatanzi Formation of the Qingbaikou System is called the Nanguanling vertical movement.The Nanguanling uplift and subsidence interface marks the end of the Jinning Movement and the beginning of the Dalian Movement.The confirmation of the Dalian lifting interface(about 541 Ma)marked the end of the Neoproterozoic Dalian Movement and the beginning of the Early Paleozoic Xingkai Movement.[Conclusions]The early Neoproterozoic tectonic movements in the Liaoning region were relatively frequent,with three glaciation and multiple parallel unconformity interfaces,which can be divided into two cycles:the Jinning Movement and the Dalian Movement,as well as seven sub level vertical movements,providing important reference materials for regional stratigraphic research and comparison.
万方数据
维普
