Foraminifera occurrences of IODP Hole 386-M0081B@en

Results of Foraminifera assemblage analyses from the above given hole of International Ocean Discovery Program (IODP) Expedition 386 (Japan Trench Paleoseismology). The offshore phase of this expedition took place between 2021-04-13 and 2021-06-01 onboard Japanese R/V Kaimei from and to Yokosuka, Japan, followed by an onshore phase onboard D/V Chikyu between 2022-02-14 – 2022-03-15. During the offshore phase, micropaleontology samples were taken from the end of split cores at 5 m intervals. During the onshore phase approximately 2 cubic centimetres of sediment from each of these samples were analysed for foraminifera. After drying overnight in a ~40°C oven, samples were disaggregated in a solution of deionized water, Calgon, and H2O2 to ensure removal of clay-sized particles. Samples were then wet sieved through a 63 μm mesh sieve and rinsed with deionized water. The coarse fraction was placed on filter paper in an oven at ~40°C until it dried completely. Faunal identifications were made using a Meiji Techno RZ binocular light microscope. Taxonomic composition, abundance, and preservation state were observed in the >63 μm size fraction. […]本数据集为国际大洋发现计划（International Ocean Discovery Program, IODP）第386航次（日本海沟古地震学）指定钻孔的有孔虫组合分析结果。本航次海上作业阶段于2021年4月13日至2021年6月1日期间开展，搭载日本海洋调查船“海明号”（R/V Kaimei）从日本横须贺启航并返回；随后的陆上作业阶段于2022年2月14日至2022年3月15日期间在“地球号”深海钻探船（D/V Chikyu）上完成。海上作业阶段，研究人员以5米为间隔，从劈开岩芯的末端采集微古生物学样品。陆上作业阶段，研究人员从每份采集的样品中取约2立方厘米的沉积物开展有孔虫分析。具体实验流程如下：样品先在约40℃烘箱中过夜干燥，随后置于去离子水、六偏磷酸钠（Calgon）与过氧化氢（H₂O₂）的混合溶液中分散，以彻底去除黏土级颗粒；接着将样品通过63微米孔径筛进行湿筛，并用去离子水冲洗筛上组分。将筛留的粗粒组分铺于滤纸上，置于约40℃烘箱中直至完全干燥。采用明技（Meiji Techno）RZ型双目光学显微镜完成有孔虫类群鉴定，对粒径大于63微米的组分记录其分类组成、个体丰度与保存状态。[...]