Foraminifera occurrences of IODP Hole 386-M0084D

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.For further methodological information see methods chapter in Strasser, M. et al., 2023 https://doi.org/10.14379/iodp.proc.386.102.2023

本数据集为国际大洋发现计划（International Ocean Discovery Program, IODP）386次航次（日本海沟古地震学研究）指定钻孔的有孔虫组合分析结果。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，作业船为日本“海洋号”（R/V Kaimei），往返航次于日本横须贺港起止；随后的陆上作业阶段于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米为间隔，从劈分岩芯的末端采集微古生物学样品。陆上作业阶段，研究人员从每份上述样品中取约2立方厘米的沉积物，开展有孔虫分析。将样品置于约40℃烘箱中过夜干燥后，将其分散于去离子水、Calgon与过氧化氢（H₂O₂）的混合溶液中，以去除黏土级颗粒。随后将样品通过63μm孔径筛进行湿筛，并用去离子水冲洗。将筛余的粗粒组分置于滤纸上，再次置于约40℃烘箱中至完全干燥。采用明技（Meiji Techno）RZ型双目光学显微镜开展类群鉴定，对>63μm粒级组分的分类组成、丰度及保存状态进行观测。更多方法学细节可参见Strasser M等人2023年发表的《国际大洋发现计划386次航次研究报告》方法章节，链接为https://doi.org/10.14379/iodp.proc.386.102.2023