Genetic Mechanism of Double-Layer Structure in Paleogene of Fushan Sag,Beibu Gulf Basin
Lin Zhengliang
Wang Hua
Li Hongjing
Ma Qinglin
Li Yuan
Zhao Shue
Abstract：Based on the regional tectonic analysis of Beibu Gulf basin,in this paper,the tectonic activities of Fushan sag is stud-ied,the dynamic formation mechanism of the sag is discussed,and the formation mechanism of double-layer structure in Paleo-gene strata of the eastern area is analyzed.It is regarded that Fushan sag was under the dual effect of sinistral strike-slip of Red River fault and clockwise rotation of Hainan uplift.During the deposition period of the third member of Liushagang Formation (Els 3 ),intense horizontal extension occurred during the rotation and pull-apart of the sag,which provided dynamic source for the antithetic faults of the lower tectonic layer in the eastern area.The rapid uplift of Hainan uplift led to the formation of grav-ity slumping growth faults in the upper tectonic layer.In the Early Oligocene,the intrusive igneous rocks in the second member of Liushagang Formation (Els 2 )formed a natural barrier.Finally,there formed the double-layer structure.The forming process of the double-layer can be divided into five major stages as follows:rifting embryonic period,extending faulted period of the lower tectonic layer,development period of middle plastic layer,formation period of tectonic system,and finalizing peri-od of double-layer structure.
Keywords：difference extensiondouble-layer structuregenetic mechanismFushan sagBeibu Gulf basinpetroleum geology
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 169-178 )