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南海莺-琼盆地自晚中新世以来在莺-黄组中发育了巨厚的内陆架斜坡和海底重力流体系. 这套沉积可划分为9个层序, 可识别出斜坡滑塌-泥石流、斜坡-盆底扇以及罕见的大型盆底轴向下切谷、重力流等沉积组合, 它们具有特定的构成和分布样式并受盆地古构造的控制. 晚中新世陆架斜坡和深水盆地的出现与最近一幕的构造快速沉降和大量沉积物供给的盆地背景有关; 晚中新世和上新世早期发育的大型盆底下切谷和重力流体系则标志着南海曾发生过多次明显的海平面下降事件.
The South China Yingying-Qiong Basin has developed thick inland shelf slopes and seabed gravity flow systems since the Late Miocene in the Ying-Huang Formation.These deposits can be divided into nine sequences that can identify slopes and landslides, Slope-basin subduction, and rare large-scale basin-bottom axis downcutting, gravity flow and other sedimentary assemblages that have specific compositions and distribution patterns and are controlled by paleo-structural controls of the basin. The appearance of the Late Miocene shelf slopes and deep-water basins The recent episode of rapid subsidence of structures and the basin background of massive sediment supply; the large basin-undercut valleys and gravity flow systems developed in the late Miocene and early Pliocene signaled several significant sea-level declines in the South China Sea event.