Foraminifera occurrences of IODP Hole 386-M0089B

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）386航次（日本海沟古地震学）指定钻孔的有孔虫组合（Foraminifera assemblage）分析结果。该航次的海上作业阶段于2021年4月13日至2021年6月1日期间开展，搭载日本“海明”号（R/V Kaimei）研究船，作业往返均以日本横须贺为始发及终到港，随后于2022年2月14日至2022年3月15日期间，在“地球”号（D/V Chikyu）钻探船上完成陆上作业阶段。
海上作业阶段以5米间隔从劈开岩芯的末端采集微古生物学样品；陆上作业阶段则从每份样品中取约2立方厘米沉积物，开展有孔虫分析。
样品先在约40℃的烘箱中过夜干燥，随后置于去离子水、六偏磷酸钠（Calgon）和过氧化氢（H₂O₂）的混合溶液中进行分散处理，以去除黏土级颗粒。之后将样品通过63 μm孔径筛网进行湿式筛分，并用去离子水冲洗干净。将筛分得到的粗粒级组分置于滤纸上，放入约40℃的烘箱中直至完全干燥。
使用明治Techno RZ型双目光学显微镜完成类群鉴定，对>63 μm粒级组分的分类组成、丰度及保存状态开展观测分析。