(Table 2) Occurrence of the most abundant nannofossil taxa in middle Cretaceous sediments of ODP Leg 129 sites@en

Middle Cretaceous calcareous nannofossils were quantitatively studied at Sites 800, 801, and 802 of Leg 129. Samples were selected after careful inspection of the total abundance and preservation of nannofloras in pelagic sediments in order to analyze only the best-preserved assemblages and exclude major secondary modifications of the nannofloras due to dissolution/diagenesis. Nannofossil data were compared with radiolarian distribution and paleolatitude values to trace the response of planktonic communities to plate motions toward the paleoequator. […]本研究对第129航次800、801及802站位的白垩纪中期钙质超微化石（calcareous nannofossils）开展了定量研究。研究人员在对远洋沉积物（pelagic sediments）中超微化石群（nannofloras）的总丰度与保存状态进行细致检核后筛选样品，仅分析保存最优的化石组合，以排除由溶解作用（dissolution）/成岩作用（diagenesis）导致的超微化石群次生改造。本研究将超微化石数据与放射虫（radiolarian）分布及古纬度（paleolatitude）值进行对比，以此追溯浮游生物群落（planktonic communities）响应向古赤道（paleoequator）方向移动的板块运动（plate motions）的过程。[…]