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PD-99孔位于长江三角洲南翼,揭示的晚新生代地层厚313 m.独居石年龄谱表明,上新统以350-500 Ma的颗粒为主,第四系则以100-275 Ma的颗粒为主,反映二者母源区发生了变化.晚于25 Ma的独居石颗粒初现层位于高斯正极性带与松山负极性带界线之上(约在2.58 Ma),这是青藏高原隆升对东中国海沉积产生直接影响的开端.长江河口地层中晚于25 Ma独居石含量变化分为两大阶段,分别对应于早、中更新世青藏高原的快速隆升和晚更新世以来的最强烈隆升.
The PD-99 hole is located in the southern wing of the Yangtze River Delta, revealing late-Cenozoic strata 313 m thick. The monazite age spectrum indicates that the Upper Pleistocene is dominated by 350-500 Ma and the Quaternary is 100-275 Ma , Reflecting the change of the maternal source area.The monazite particles occurring later than 25 Ma are located above the boundary between the positive and negative Songshan Mountains (about 2.58 Ma), which is the result of the Tibetan Plateau uplift Which has a direct impact on the sedimentation of the East China Sea.The monazite content of the Yangtze River estuary strata below 25 Ma is divided into two major stages, corresponding to the rapid uplift of the early and middle Pleistocene Qinghai-Tibet Plateau since the late Pleistocene Strong uplift.