Source data, chronology and analysis code for core CSHC-4

It contains source data for the main and supplementary figures, the AMS-14C chronology and piecewise age model for Core CSHC-4, the cleaned core-level geochemical dataset, statistical-analysis tables, and Python code reproducing the key reported correlations. Core CSHC-4 was recovered from the western continental slope of the middle Okinawa Trough and spans approximately 0.98–44.81 ka BP.

The dataset includes chromium-reducible sulfur (CRS), bulk pyrite δ34S, organic-carbon variables, major- and trace-element data, Mo and U enrichment factors, elemental Fe/Al, sedimentation rate, depositional-age assignments, and present-day porewater-zone classifications. The repository documents the data and calculations supporting the interpretation that most pyrite sulfur mass formed early, whereas a comparatively small sulfur component acquired or exchanged under progressively sulfate-restricted, methane-influenced burial conditions can exert strong leverage on bulk pyrite δ34S.