由于北冰洋中部记录深海沉积历史的深海长沉积岩心缺乏很好的测年资料 ,其新生代古环境发育基本上仍然是未知的。北冰洋沉积物的主要问题是难以在已有沉积岩心中建立精确的年代与深度的关系。北冰洋岩心中钙质微体化石动物群和植物群保存较差，阻碍了常规生物地层学和同位素古 Due to the lack of good dating data in the deep-sea sedimentary core recorded in the deep Arctic Ocean in the history of deep-sea sediments, its Cenozoic paleoenvironmental development remains largely unknown. The main problem with Arctic sediments is the difficulty of establishing precise age-depth relationships in existing sedimentary cores. The calcareous microfossil fauna and flora in the Arctic Ocean cores are poorly preserved, hindering conventional bio-stratigraphy and isotopic paleo-ancient