Understanding the collapse of the Neoproterozoic Snowball Earth is crucial for unraveling microbial responses to extreme climate change. However, the contrasting lithostratigraphic architecture of the glacial deposits and post-glacial sedimentary facies makes it challenging to identify clear global patterns of marine biogeochemical change across the two ice-house-hot-house transitions. To address this, we conducted a basin-scale mineralogical and geochemical analysis of pyrite in the terminal Sturtian glacial units of South China. Sedimentary-diagenetic pyrite occurs as nodules, laminae, and disseminated forms, with the latter type dominating most strata. Disseminated pyrite comprises euhedral/anhedral crystals and framboids. In the slope facies, laser-ablation S34Spy of the euhedral/anhedral crystals is uniform at 58.9+3.0%o. Framboids within almost all samples constitute 1-63% of total pyrite, and their proportion negatively correlates with bulk-sample S34Spy values. This morphology-isotope correlation appears to be a persistent feature across the basin. Specifically, the shelf facies lacks framboids and shows bulk-sample S34Spy values of 38.3+2.9%o and the basin facies is enriched in-100% framboids and yields bulk-sample S34Spy values of 12.7+6.9%o. Pyrite content increases seaward from 0.2+0.2 wt.% to 0.8+2.0 wt.% but peaks at 5.6+2.7 wt.% in the slope facies. Across these sulfur isotope trends samples have TOC contents of 0.4+0.5 wt.% and S13Corg values of-30.5+1.7%o and display a negative correlation within the slope facies. We simulated the geochemical data through one-dimensional diffusion-advection-reaction and two-component organic carbon degradation models. While the former does not reproduce the sulfur abundance and isotope data, the latter suggests that the primary carbon is-30 times that of detrital carbon. These results define a seaward-thinning euxinic wedge with a S34S gradient during the transition out of the Sturtian Snowball Earth, providing a window into this critical event.