The role of carbonate factories and sea water chemistry on basin‐wide ramp to high‐relief carbonate platform evolution: Triassic, Nanpanjiang Basin, South China

The end-Permian extinction and its aftermath altered carbonate factories globally for millions of years, but impact on platform geometries remains poorly understood. Here, the evolution in architecture composition two exceptionally exposed platforms Nanpanjiang Basin are constrained compared with geochemical proxies to evaluate controls geometries. Geochemical indicate elevated siliciclastic nutrient fluxes basal Triassic, at Induan—Olenekian boundary uppermost Olenekian. Cerium/Ce* shifts from high Ce/Ce* values a lack Ce anomaly indicating anoxia during Lower Triassic negative oxygenation latest Olenekian Anisian. Uranium Mo depletion represents widespread world's oceans Early progressive Carbonate shifted skeletal Late Permian abiotic microbial before returning systems Middle Anisian coincident declining anoxia. Margin facies oolitic grainstone development giant ooids extensive marine cements. margins, contrast, boundstone diverse component. shift ramp steep, high-relief, flat-topped profiles is decoupled compositions having occurred prior onset basin biotic stabilisation margins. A basin-wide synchronous high-relief points combination subsidence rate starvation coupled rates accumulation cement margins as primary causes margin up-building. High sea water saturation resulting sinks precipitation, promoting an expanded depth supersaturation, probably contributed that stimulated architecture.