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通过对南海北部ODP 184航次1148站(18°50.17.3′N, 116°33.93′E, 水深3308.3 m) 1165个样品中底栖有孔虫的同位素分析, 获得了24 Ma以来连续的、平均分辨率为21 ka的δ18O曲线. 这是迄今全球晚新生代最连续、最完整和分辨率最高的δ18O曲线. 总体上呈梯状递增的δ18O曲线清楚地记录了晚新生代以来5次变重和3次变轻事件及2个稳定期, 反映了全球气候逐渐变冷过程的变化. 其中发生在17.2-14.5 Ma的变轻事件及14.5-13.6 Ma和3.0-2.4 Ma的两个变重事件最为显著, 都可以进行全球性对比. 13.6-10.2 Ma和6.0-3.0 Ma两个时期δ18O变动平稳和振幅最小, 代表南海晚新生底层水变化最小的稳定时期. 1148站的氧同位素记录为西太平洋和我国海相地层的全球性对比提供了最佳的剖面.
By means of isotope analysis of benthic foraminifera in 1165 samples of ODP 184 at the northern South China Sea at 1148 stations (18 ° 50.17.3’N, 116 ° 33.93’E, and 3308.3 m of water depth), a series of continuous, average The δ18O curve with a resolution of 21 ka is by far the most continuous, the most complete and the most resolu- tive δ18O curve in the world in late Cenozoic. Generally, the δ18O curve with increasing step-by-step clearly records five changes in weight since late Cenozoic And three light events and two stable periods, reflecting the gradual cooling process of the global climate changes in which occurred in the light events of 17.2-14.5 Ma and 14.5-13.6 Ma and 3.0-2.4 Ma two variable events Which is the most significant and can be globally compared.The δ18O fluctuates steadily and has the least amplitude between 13.6-10.2 Ma and 6.0-3.0 Ma, which represents the stable period with the least change in the bottom water of the Late Neocene in the South China Sea.The oxygen isotope of 1148 station is recorded as the western Pacific Ocean And the global comparison of marine strata in China provides the best profile.