Foraminifera occurrences of IODP Hole 386-M0094A

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.

国际大洋发现计划（IODP）第386航次（日本海沟古地震学）上述钻孔的有孔虫（Foraminifera）组合分析结果。该航次的海上阶段于2021年4月13日至2021年6月1日在日本‘海洋’号科考船（R/V Kaimei）上进行，往返于日本横滨；随后的陆上阶段于2022年2月14日至2022年3月15日在‘地球’号钻探船（D/V Chikyu）上开展。海上阶段期间，在劈分岩心末端以5米间隔采集微体古生物学（Micropaleontology）样本。陆上阶段期间，从每个样本中取约2立方厘米沉积物进行有孔虫分析。样本在约40°C烘箱中过夜干燥后，置于去离子水、卡尔冈（Calgon）和过氧化氢（H₂O₂）的混合溶液中分散，以确保去除黏土级颗粒。随后样本经63 μm网筛湿筛，并用去离子水冲洗。粗颗粒组分置于滤纸上，在约40°C烘箱中烘干至完全干燥。利用明治 Techno RZ双目光学显微镜进行动物群鉴定；在>63 μm粒级组分中观察分类组成、丰度及保存状态。