Smear slide descriptions of IODP Hole 386-M0090A

Descriptions of smear slides 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. This was followed by an onshore phase onboard D/V Chikyu between 2022-02-14 – 2022-03-15. During the offshore phase, smear slides were prepared from paleontology samples collected with a tip-cut syringe from section ends every 5 m. During the onshore phase, smear slides samples were collected every 2 m to complement visual core description observations and identify the composition of fine-grained sediment. The smear slides were prepared by putting a small amount of sediment on a glass slide mixed with distilled water. The slide was subsequently evaporated on a hot plate, and the dried sample was mounted in Norland Optical Adhesive 61 using ultraviolet light. Sediment grain size and composition were examined under a polarized light petrographic microscope (Zeiss Axio Imager A1m POL-1) with an ocular micrometer.

本数据集涵盖国际大洋发现计划（International Ocean Discovery Program, IODP）386次航次（日本海沟古地震研究）指定钻孔的涂片玻片相关描述。本次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，搭载日本科考船“开明号”（R/V Kaimei），往返于日本横须贺港。后续的陆上作业阶段于2022年2月14日至2022年3月15日期间在“地球号”（D/V Chikyu）钻探船上完成。海上作业阶段中，科研人员每间隔5米从岩芯段末端使用切尖注射器采集古生物样本，并以此制备涂片玻片。陆上作业阶段则每间隔2米采集涂片玻片样本，用于补充岩芯视觉描述观测结果，同时识别细粒沉积物的组成成分。涂片玻片的制备流程为：取少量沉积物与蒸馏水混合后滴于载玻片上，随后在热板上蒸干，再使用紫外光固化的诺兰光学胶61（Norland Optical Adhesive 61）完成封片。随后借助配备目镜测微尺的偏光岩石显微镜（Zeiss Axio Imager A1m POL-1）对沉积物的粒径与组成进行观测分析。