Foraminifera occurrences of IODP Hole 386-M0082B@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（日本海沟古地震学研究）指定钻孔的有孔虫组合分析成果。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“开南号（R/V Kaimei）”科考船从日本横须贺起航并返回横须贺；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）”深海钻探船上完成。海上作业阶段，以5米为间隔从劈分后的岩芯末端采集微古生物样品。陆上作业阶段，对每份前述样品取约2立方厘米的沉积物开展有孔虫分析：先将样品置于约40℃烘箱中过夜干燥，随后用去离子水、Calgon（六偏磷酸钠）与过氧化氢的混合溶液进行分散解聚，以去除黏土级颗粒；之后将样品通过63 μm孔径筛网进行湿筛筛分，并用去离子水冲洗；将筛余的粗粒级分置于滤纸上，在约40℃烘箱中完全烘干。使用明技（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 μm的组分开展分类学组成、丰度及保存状态的观测。[…]