Natural remanent magnetization data from IODP Hole 386-M0091D

Natural remanent magnetization (NRM) data 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. Because the diameter of the split section (12.5 cm) is larger than the magnetometer entrance (8.1 cm), U-channel samples were taken from the center of each working half during the onshore phase. Measurements were conducted likewise during the onshore phase using the long-core superconducting rock magnetometer (2G Enterprises, model 760) installed on D/V Chikyu. Due to time constraints paleomagnetism measurements were limited to NRM with 5 mT demagnetization, with measurements typically made at 2 cm intervals. Because linearity is difficult to calculate for short cores, such as trigger cores, corrections of declination were not performed for these cores. […]

本数据集涵盖国际大洋发现计划（International Ocean Discovery Program, IODP）386航次（日本海沟古地震学研究航次）上述钻孔的天然剩余磁化强度（Natural remanent magnetization, NRM）数据。该航次的海上作业阶段于2021年4月13日至2021年6月1日开展，以日本横须贺为始发及终到港，搭载日本「开明」号（R/V Kaimei）完成；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」号钻探船（D/V Chikyu）上进行。因剖开岩心段的直径（12.5 cm）大于磁力仪入口直径（8.1 cm），陆上作业阶段中，研究人员从每块半分工作岩心的中心区域采集U型岩心样品（U-channel samples）。同期的磁化强度测量工作，由搭载于「地球」号钻探船的2G Enterprises公司760型长岩心超导岩石磁力仪（long-core superconducting rock magnetometer, 2G Enterprises, model 760）完成。受时间条件限制，古地磁测量仅针对经5 mT退磁处理的天然剩余磁化强度，测量采样间隔通常设置为2 cm。由于短岩心（如触发式岩心（trigger cores））难以计算线性度，因此未对这类岩心进行磁偏角校正。[…]