Foraminifera occurrences of IODP Hole 386-M0091B@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）386航次（日本海沟古地震学专项）指定钻孔的有孔虫（Foraminifera）组合分析结果。本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，作业船为日本“开明号”（R/V Kaimei），往返航经日本横须贺港；后续陆上作业阶段于2022年2月14日至2022年3月15日在“地球号”（D/V Chikyu）钻探船上完成。海上作业阶段，研究人员以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，则对每份上述样品取约2立方厘米的沉积物开展有孔虫分析。样品首先置于约40℃的烘箱中过夜干燥，随后在去离子水、Calgon与过氧化氢的混合溶液中解聚，以去除黏土级颗粒。之后将样品通过63微米孔径的湿筛网筛分，并用去离子水冲洗干净。将所得粗粒级组分放置于滤纸上，置于约40℃的烘箱中完全干燥。研究人员使用明治科技（Meiji Techno）RZ型双目光学显微镜开展物种鉴定，对粒径>63微米组分的分类组成、丰度及保存状态进行观测。[...]