Sequence Filling Dynamics of Youjiang Basin,Southern China

CHEN Hong de; QIN Jian xiong; TIAN Jing chun; PENG Jun; HOU Zhong jian

In the light of sequence-basin-earth theory in conjunction with previou s stra tigraphy,sedimentology,basin analysis and sequence stratigraphy,the sequence fil ling dyna mics of Youjiang Basin has been studied in detail.Fi ve hierachies of sequence boundaries and corresponding five hierachies of deposi tional sequences,1 super-order sequence,4 1st-order sequences,6 2nd-order sequen ces,11 sequence sets,47 3rd-order sequences and a certain amount of 4th-and 5th- order seq uences have been recognized for the first time.Relationship between sequence bo un dary and geological events,and that of sequence hierachy and basin type have bee n discusse d,and then sequence stratigraphic framework of Youjiang Basin has also been established.By the cognition that sequence development of rifting basin is mai nly controlled by synsedimentary fault and fundamental subsidence,relationship b etween sequence genesis and basin structure has been set up. The sequence f ramework and filling proccess are obviously distinct within different genetic ba sins. Finally,the author delibr ated the sequence filling dynamic process and related basin evolution of the You jiang Basin.On the basis of the research result mentioned above,this paper sugg e sts that the sequence filling process of the Youjiang Basin can be subdivided in to four stages:intracontinental rifting,marginal rifting,retroarc rifting and fo reland basin,constituting a complete tectonic cycles during Hercynian-In dosinian stage.

State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation, Institute of Sedimentary Geology, Chengdu University of Technology,Chengdu 610059

Received Date: 1999-06-30

Publish Date: 2000-06-10

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Abstract: In the light of sequence-basin-earth theory in conjunction with previou s stra tigraphy,sedimentology,basin analysis and sequence stratigraphy,the sequence fil ling dyna mics of Youjiang Basin has been studied in detail.Fi ve hierachies of sequence boundaries and corresponding five hierachies of deposi tional sequences,1 super-order sequence,4 1st-order sequences,6 2nd-order sequen ces,11 sequence sets,47 3rd-order sequences and a certain amount of 4th-and 5th- order seq uences have been recognized for the first time.Relationship between sequence bo un dary and geological events,and that of sequence hierachy and basin type have bee n discusse d,and then sequence stratigraphic framework of Youjiang Basin has also been established.By the cognition that sequence development of rifting basin is mai nly controlled by synsedimentary fault and fundamental subsidence,relationship b etween sequence genesis and basin structure has been set up. The sequence f ramework and filling proccess are obviously distinct within different genetic ba sins. Finally,the author delibr ated the sequence filling dynamic process and related basin evolution of the You jiang Basin.On the basis of the research result mentioned above,this paper sugg e sts that the sequence filling process of the Youjiang Basin can be subdivided in to four stages:intracontinental rifting,marginal rifting,retroarc rifting and fo reland basin,constituting a complete tectonic cycles during Hercynian-In dosinian stage.

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Reference (11)

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Sequence Filling Dynamics of Youjiang Basin,Southern China

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