Zubair deltaic margin Zn–Ni isotope datasets (RU-386, WQ-148) — Supplementary Tables S1–S3 (XLSX, v1.0.0)

Datasets supporting the GCA submission on Zn–Ni isotope cycling along the Zubair deltaic margin (RU-386, WQ-148). Includes three Excel tables (S1–S3) covering bulk sediment geochemistry, porewater profiles, and authigenic metal estimates, with isotope ratios (δ⁶⁶Zn, δ⁶⁰Ni), uncertainties, and metadata. XLSX + README. CC BY 4.0. Raw INOC instrument files are restricted; de-identified subsets available on request with INOC approval.