半深海沉积

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 .

而在本组沉积晚期，水体开始变浅，大致为大陆斜坡-陆隆半深海浊流沉积环境。

During the late period of sedimentation , however , the water depth became shallower as the environment of turbidity current in continental slope rising .

结果显示，该站位沉积物颗粒较细，为典型的半深海型沉积，颗粒大小主要为2～8μm，几乎没有大于63μm的颗粒。

The analyses revealed that sediments at this site were fairly fine and typically semi-pelagic , with 2 ~ 8 μ m grains dominating and with scarce grains larger than 63 μ m.

半深海深海沉积中生物碎屑的组成和含量往往成为确定沉积类型的重要因素。东北地区早白垩世沉积类型兼论侏罗自垩系界线

The composition and content of bioclasts are important factors for the classification of different sediments in the bathyal-abyssal areas . ON THE LOWER CRETACEOUS SEDIMENTATION TYPE AND THE CONTINENTAL JURASSIC-CRETACEOUS BOUNDARY IN NORTHEAST CHINA

贵州南部紫云剖面由上二叠统长兴组的碳酸盐台地边缘沉积体系、下三叠统罗楼组的碳酸盐浅海陆棚沉积体系、以及下三叠统紫云组的半深海深海沉积体系组成。

The Ziyun section , located in the south of Guizhou province , is composed of the carbonate reef depositional system , the carbonate muddy shelf depositional system , and the bathyal depositional system .

与此同时，盆地东部和西部发育碳酸盐岩台地和生物礁，围区深坳部位为巨厚的滨-浅海和半深海充填沉积。

Meanwhile , the carbonate platform and reef composite developed in the east and west of this basin , and huge littoral , neritic and bathyal sediments filled in the waning places surrounding these platforms .