Depositional architecture and developing settings of large- scale incised valley and sub- marine gravity flow systems in the Yinggehai and Qiong- dongnan basins, South China Sea

摘要

In the Ying-Qiong basins in the South China Sea developed a set of giant inner shelf slope and submarine Gravity flow deposits in the Ying-Huang formations since the Late Miocene. These deposits can be classified into 9 se- Quences in which slope slump-debris flow, slope fan and par- Ticularly, the large-scale axial basin-floor incised valley fills Have been recognized. They were distributed in a distinctive Pattern attributed to tectonic control. The development of Shelf slopes and abyssal plains in the basins was related to The last episode of rapid subsidence and a large amount of Sediment inputs. Large-scale basin-floor incised valleys, Formed during the late Miocene and Pliocene, indicate sev- Eral major sea level falls that occurred in the South China Sea.