Planktic foraminiferal and Ice Rafted Debris (IRD) counts from ODP Site 981

This dataset contains counts of Neogloboquadrina pachyderma, whole foraminifera and Ice Rafted Debris from ODP Site 981 covering the period 0.95-1.1Ma. Sediment samples from the splice of ODP Site 983 [Jansen et al., 1996] were spun overnight and washed with deionised water through a 6 μm sieve before being dried at 40°C. IRD and foraminiferal counts were made on the >150 μm fraction after splitting to yield approximately 300 entities. IRD was considered as the total number of lithogenic/terrigenous grains counted. Only left coiling specimens of N. pachyderma were counted and all 5 morphotypes of N. pachyderma found in recent Arctic sediments [Eynaud, 2011] were counted.

本数据集包含覆盖0.95~1.1 Ma时段的大洋钻探计划（Ocean Drilling Program，简称ODP）981站位的厚壁新方球虫（Neogloboquadrina pachyderma）、完整有孔虫以及冰筏碎屑（Ice Rafted Debris，简称IRD）的统计计数数据。研究沉积物样品取自ODP 983站位的拼接岩芯[Jansen等，1996]，经过夜离心处理后，以去离子水过6 μm筛网冲洗，最终于40℃下烘干。IRD与有孔虫的计数均基于>150 μm的粒级组分，经分样后得到约300个统计实体。IRD的统计值为所计数的岩源性/陆源性碎屑颗粒总数。本次研究仅统计厚壁新方球虫的左旋壳体标本，且同时计数了现代北极沉积物中已报道的该物种全部5种形态类型[Eynaud，2011]。