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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2008, Vol. 9 Issue (5): 702-713    DOI: 10.1631/jzus.A071572
Energy & Environmental Engineering     
A Cenozoic tectono-sedimentary model of the Tainan Basin, the South China Sea: evidence from a multi-channel seismic profile
Wei-wei DING, Jia-biao LI, Ming-bi LI, Xue-lin QIU, Yin-xia FANG, Yong TANG
Key Laboratory of Submarine Geoscience, State Oceanic Administration, Hangzhou 310012, China; Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China; Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
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Abstract  The Tainan Basin is one of the set of Cenozoic extensional basins along northern margin of the South China Sea that experienced extension and subsequently thermal subsidence. The Tainan Basin is close to the Taiwan Arc-Trench System and straddles a transition zone between oceanic and continental crust. A new regional multi-channel seismic profile (973-01) across the region of NE South China Sea is introduced in this paper. In seismic stratigraphy and structural geology, a model of Cenozoic tectono-sedimentation of the Tainan Basin is established. The results show that three stages can be suggested in Tainan Basin; In Stage A (Oligocene (?)-Lower Miocene) the stratigraphy shows restricted rifting, indicating crustal extension. Terrestrial sediments mostly filled the faulted sags of the North Depression on the continental shelf. Structural highs, including the Central Uplift, blocked material transportation to the South Depression in abyssal basin. In Stage B the Tainan Basin (Middle-Upper Miocene) exhibits a broad subsidence resulting from the post-rifting thermal cooling. The faulted-sags in North Depression had been filled up. Terrestrial materials were transported over the structural highs and deposited directly in the South Depression through submarine gullies or canyons. This sedimentation resulted in a crucial change in the slope to a modern shape. In Stage C (Latest Miocene-Recent) a phase change from extension to compression took place due to the orogeny caused by the overthrusting of the Luzon volcanic arc. Many inverse structures, such as thrusts, fault bend folds, and a regional unconformity were formed. Forland basin began developing.

Key words： Southwest Tainan Basin      Dual-layered structure      Fault bend fold      Tectono-sedimentary evolution     
Received: 30 October 2007      Published: 11 April 2008
CLC:  P5  
  P7  
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Wei-wei DING
Jia-biao LI
Ming-bi LI
Xue-lin QIU
Yin-xia FANG
Yong TANG
Cite this article:

Wei-wei DING, Jia-biao LI, Ming-bi LI, Xue-lin QIU, Yin-xia FANG, Yong TANG. A Cenozoic tectono-sedimentary model of the Tainan Basin, the South China Sea: evidence from a multi-channel seismic profile. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2008, 9(5): 702-713.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A071572     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2008/V9/I5/702

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