Smear slide microscopy images of IODP Hole 386-M0091B

Collection of smear slide microscopy images 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. With a few exceptions, one photo with open and one with crossed nicol prisms was taken of each slide.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）第386次航次（日本海沟古地震学研究）指定钻孔的涂片显微镜图像集合。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，作业船只为日本籍调查船开南号（R/V Kaimei），往返航次始于并终于日本横须贺港。随后的陆上作业阶段于2022年2月14日至2022年3月15日期间在地球号钻探船（D/V Chikyu）上进行。海上作业阶段中，研究人员每隔5米从岩芯段末端使用切尖注射器采集古生物样本，并制备涂片。陆上作业阶段中，研究人员每隔2米采集涂片样本，以补充岩芯目视描述观测结果，并识别细粒沉积物的组成。涂片的制备流程为：取少量沉积物置于载玻片上，与蒸馏水混合；随后将载玻片置于加热板上蒸发水分，之后使用紫外光将干燥后的样本用诺兰光学胶61（Norland Optical Adhesive 61）封片。研究人员使用配备目镜测微尺的偏光岩石显微镜（蔡司Axio Imager A1m POL-1）对沉积物的粒度与组成进行检测。除少数例外情况外，每张涂片均拍摄两张照片：一张采用单偏光（开启尼科尔棱镜）模式，另一张采用正交偏光（交叉尼科尔棱镜）模式。如需了解更多实验方法细节，请参阅Strasser M.等人2023年发表的相关章节，链接：https://doi.org/10.14379/iodp.proc.386.102.2023