Headspace gas concentrations of IODP Hole 386-M0089D

Headspace (HS) gas concentrations of 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. Following standard protocols for headspace sampling, all headspace samples were collected onboard (offshore) from the base of each section immediately after section cutting following core recovery on deck. Two parallel headspace samples (IODP standard and requested samples) were collected from the bottom of every GPC core section, the longest core from each site, and the respective shorter trigger core. For each headspace double sample, ~5 cm³ of sediment was collected (using two 2.5 cm³ tip-cut syringes). Each 2.5 cm³ headspace sample was then added to a 20 mL crimp vial with 5 mL of 1 M NaOH. After sealing, the samples were preserved at 4°C until analysis.For further methodological information see methods chapter in Strasser, M. et al., 2023 https://doi.org/10.14379/iodp.proc.386.102.2023

国际大洋发现计划（IODP）386航次（日本海沟古地震学）上述钻孔的顶空（HS）气体浓度数据。该航次的海上阶段于2021年4月13日至6月1日在日本“海洋”号科考船（R/V Kaimei）上开展，往返于日本横须贺；随后的陆上阶段于2022年2月14日至3月15日在“地球”号钻探船（D/V Chikyu）上进行。遵循顶空取样标准规程，所有顶空样品均在甲板取心后、岩心段切割完成的第一时间于海上科考船（船上）从每个岩心段底部采集。针对每个GPC岩心段、每个站位最长的岩心以及相应较短的触发岩心，均采集了两份平行顶空样品（IODP标准样品与需求样品）。每份顶空双份样品采集约5 cm³沉积物（使用两支2.5 cm³尖端切割注射器）。随后将每份2.5 cm³顶空样品加入含5 mL 1 M氢氧化钠溶液的20 mL压盖瓶中。密封后，样品于4°C保存直至分析。更多方法学细节参见Strasser, M.等人2023年发表的方法章节，DOI：https://doi.org/10.14379/iodp.proc.386.102.2023。