Foraminifera occurrences of IODP Hole 386-M0083D@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（日本海沟古地震学研究）指定钻孔的有孔虫组合分析成果。本航次包含海上与陆上两个作业阶段：海上作业阶段于2021年4月13日至2021年6月1日期间开展，搭乘日本籍海洋调查船R/V Kaimei，往返于日本横须贺港；陆上分析阶段则于2022年2月14日至2022年3月15日期间在深海钻探船D/V Chikyu上完成。海上作业阶段中，研究人员以5米为间隔，从劈分岩芯的末端采集微古生物样品。陆上分析阶段，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相关分析。样品先在约40℃的烘箱中过夜干燥，随后置于去离子水、Calgon与过氧化氢（H₂O₂）的混合溶液中分散，以去除黏土级颗粒。随后将样品通过63微米孔径的筛网进行湿筛，并用去离子水冲洗干净。将筛余得到的粗粒组分置于滤纸上，在约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，并对粒径大于63微米的粒级组分的分类组成、丰度及保存状态进行观测。[…]