南海晚第四纪的硅藻遗体及其地质意义──Ⅲ.南海北部深海平原边部KL29剖面的硅藻组合

Late Quaternary diatom remains from South China Sea and their geological significance Ⅲ. Diatom assemblages of Core KL29 from margin deep sea plain in northern South China Sea

南海北部深海平原边部KL29柱样中共鉴定出硅藻169种和变种，隶属于53属。依据硅藻种类的含量变化，自下而上划分为三个硅藻带。其中，Ⅰ带划分出5个亚带，Ⅱ带划分出8个亚带。文中讨论了各硅藻带的古温度和古地理条件，并依据结节圆筛藻壳体大小的比值变化，确定出该柱样的地质年代：Ⅲ带属于全新世沉积，Ⅱ、Ⅰ带均属于晚更新世的沉积。

169 diatom species and varieties belonging to 53 genera are identified in the Core KL29 from the margin of the deep sea plain of northern South China Sea. Three diatom zones are divided upward according to the changes of percentage contents of the diatom species in the profile;boong them,Zone Ⅰ is further subdivided into 5 subzones and Ⅱ 8 ones. Ancient temperatural and geographical conditions of diatom zones are discussed. Based on the changes of size ratio of Coscinodiscus nodulifer cells, the stratigraphical chronology of the profile has been defined as follows:Zone Ⅲ belongs to the Holocene sediments and Zone Ⅱ, Ⅰ belongs to the Late Pleistocene sediments.