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Geoscience ›› 2010, Vol. 24 ›› Issue (2): 268-272.

• Water Resource and Environment • Previous Articles     Next Articles

Evolution of the Sagaing Strikeslip Fault and Its Control of  Shwebo Basin Structural Evolution,Myanmar

 XIE  Nan, JIANG  Ye, SHU  Guang-Hui, YANG  Song-Ling, LI  Ai-Shan,   Zhang-Ke   

  1. CNOOC Research Institute, Beijing100027, China
  • Online:2010-04-20 Published:2010-05-10

Abstract:

The formation and development of the Sagaing strip-slip fault can be classified into two main stages. The first stage is from Paleocene to Early Eocene, and oceanic plate subduction occurred along the west edge of the Burma plate. Paleocene oblique subduction has detached the Burma plate from the Eurasian plate, and the Sagaing fault began forming. The second stage is during Eocene, and the northeastern Indian and Burma plates collided, resulting in the coupling of these two plates and also accelerating the northward movement of the Burma plate along the Sagaing strip-slip.The dextral strike-slip displacement distance of Sagaing fault is up to 450 km. Controlled by the evolution of Sagaing fault, the Shwebo subbasin presents two stages of structural features. During Miocene, the Burma basin was in tensional stress, the Andaman Sea opened, back-arc spreading center drove to south because of the India coupling with western Myanmar. From Early Pliocene to Pleistocene, collision of the Burma plate and Himalayan resulted in southwest-northeast transpressional forces that produced reverse faults. Therefore,by squeezing and twist-compression of the Shwebo subbasin a series of reverse faults and “flower” structures are developed, and ultimately in south-north trend Sagaing dextral strike-slip compression stress and west-east trend transpressional environment formed.

Key words: Sagaing strike-slip fault, dextral strike-slip, structural evolution; , Shwebo basin,Myanmar

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