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菲律宾海西部吕宋岛岸外MD98-2188钻孔揭示末次冰期以来发生过数次浊流沉积事件。研究发现浊流沉积层具有密度高、颜色亮度大等物理特征,含有较多粗沉积组分和翼足类化石碎片,说明其来源于浅海沉积物。本文运用AMS ~(14)C测年和浮游有孔虫氧同位素建立精细的年龄模式,发现浊流沉积层段主要与末次盛冰期、冰期Heinrich变冷事件以及氧同位素4期等低海平面时期相对应,推测与千年尺度北半球气候冷期相关的海平面快速上升可能是西菲律宾海浊流沉积的触发原因。这对于认识快速气候变化的环境后果和开展西菲律宾海晚第四纪地层划分对比都有重要意义。
Drilling of MD98-2188 off the coast of the Philippine Sea west of Luzon revealed several turbulitic sedimentary events since the last Ice Age. It is found that the turbidity flow sediments are characterized by high density, large color and bright brightness, and more coarse sedimentary components and wing-like fossil fragments, indicating that they originated from shallow sea sediments. In this paper, the AMS ~ (14) C dating and the planktonic foraminifera oxygen isotopes were used to establish a fine age pattern. It was found that the turbidity current was mainly related to the last glacial-ice age, the Heinrich chilling event in glacial period and the low sea level period such as oxygen isotope 4 Correspondingly, it is speculated that the rapid rise of sea level associated with the Millennial climatic cold season in the Millennial Scale may be the trigger of turbidity sedimentation in the West Philippine Sea. This is of great significance to the understanding of the environmental consequences of rapid climate change and the comparison of the Quaternary stratigraphic classification of the late Philippine Sea.