Potassium isotope dichotomy in hydrogenetic ferromanganese crusts: phase-specific archieves of seawater signatures or authigenic processes?

Table S1. Percentage of K, Fe, Mn, Mg, and Ca extracted from every step in the four-step extraction experiment Table S2. K isotope and Major element results for samples from CJ01 and MDD53 Table S3. Percentage of K released in kinetic desorption experiment by NH4Ac solutions of varying concentrations and deionized water Table S4. Trace element concentrations (ppm) of Fe-Mn crust samples in this study, reference materials (NOD-A-1）, and global averages for comparison Table S5. Mineralogical composition of samples determined by XRD. Table S6. Original XRD intensity of Fe-Mn crust samples in this study补充表S1：四步萃取实验各步骤中钾（K）、铁（Fe）、锰（Mn）、镁（Mg）与钙（Ca）的萃取占比 补充表S2：CJ01与MDD53样品的钾同位素及主量元素测试结果 补充表S3：不同浓度醋酸铵（NH4Ac）溶液与去离子水开展动力学解吸实验时所释放钾的占比 补充表S4：本研究中铁锰结壳样品、参考物质（NOD-A-1）以及供对比用的全球平均值的微量元素浓度（单位：ppm） 补充表S5：通过X射线衍射（XRD）测定的样品矿物组成 补充表S6：本研究中铁锰结壳样品的原始X射线衍射（XRD）强度