Mineralogical composition, major- and trace-element concentrations, and isotopic data for Fe-Mn crust in NW Pacific

The Supporting Information includes Text S1, Tables S1–S2, and Figures S1–S7. Text S1 provides detailed analytical procedures. Tables S1–S2 report the mineralogical composition, major- and trace-element concentrations, isotopic data, and associated analytical uncertainties. Figures S1–S7 illustrate the sampling locality, hand-specimen photographs, micro-area X-ray fluorescence surface-scans (μ-XRF), geochemical profiles, rare-earth-element patterns, and element-versus-isotope correlations.