半深海沉积，水深大致在 200～2000米范围的沉积物。主要分布在大陆坡，又称陆坡沉积。大陆坡是一个分开大陆和大洋的全球性巨大斜坡，是大陆和洋盆之间的过渡地带。
晚中新世以后，盆地进入浅海半深海沉积环境的裂后热沉降期。
After Late Miocene, the basin got into a post_rift thermal subsidence stage in a shallow to semi_deep sea environment.
上新世和第四纪主要为浅海陆架及半深海充填沉积。
There were mainly neritic shelf and bathyal filling sedimentation in the Pliocene and Quaternary.
礼岷前陆盆地经历了早期深海—半深海的复理石沉积阶段和晚期陆相磨拉石沉积阶段。
The Lixian-Minxian foreland basin undertook abyssal-bathyal flysch deposition at its earlier evolution stage and continental molasse stage at its later evolution stage.
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