Radionuclide activities for sediment core SO268/2_193-1_PUC-18 at a disturbed site after a small-scale dredge experiment during RV SONNE cruise SO268/2 in the CCZ, Pacific Ocean@en

This dataset comprises downcore measurements of the activity of different radionuclides for a sediment core (ROV-operated PUC) retrieved from disturbed sites after a small-scale dredge experiment in the framework of the European collaborative JPI Oceans MiningImpact project onboard R/V SONNE cruise SO268 in 2019. The scientific work during cruise SO268 was part of the second phase of the MiningImpact project (Environmental impacts and risks of deep-sea mining) and is designed to assess the environmental impacts of deep-sea mining of polymetallic nodules in the Clarion-Clipperton Zone (CCZ) in the Pacific Ocean. After performing total acid digestions, the sediments were analyzed by isotope dilution using ICP-SF-MS (Element2, Thermo Scientific) for the determination of radionuclides at the Marine Geochemistry Lab, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven.本数据集包含2019年在欧洲协作式JPI Oceans（Joint Programming Initiative on Oceans）MiningImpact项目框架下，于“索恩”号（R/V SONNE）考察航次SO268上开展的小型疏浚实验后，由遥控水下机器人（Remotely Operated Vehicle, ROV）操控的PUC采集自扰动区域的沉积物岩芯的沿岩芯深度放射性核素活度测量数据。本次SO268航次的科研工作属于MiningImpact项目第二阶段（深海采矿的环境影响与风险）的组成部分，旨在评估太平洋克拉里昂-克利珀顿区（Clarion-Clipperton Zone, CCZ）多金属结核深海采矿的环境影响。沉积物经全酸消解后，于不来梅港亥姆霍兹极地与海洋研究中心阿尔弗雷德·魏格纳研究所海洋地球化学实验室，采用同位素稀释法结合电感耦合等离子体扇形磁场质谱（Inductively Coupled Plasma Sector Field Mass Spectrometry, ICP-SF-MS，赛默飞世尔Thermo Scientific Element2）完成放射性核素的定量测定。