Mo isotopic response to the end of Neoproterozoic Marinoan Glaciation: Evidence from a sedimentary profile in South China

•The increasing δ98Mo values of the marine sedimentary rocks reveal an oxygenation of seawater.•The TOC and Mo contents indicate that intense chemical weathering ceased when the cap carbonate precipitated.•A lagged response of Mo isotope system to the shallow-ocean oxygenation at the bottom of the interval III.•The ocean has been widely oxidized at the early Cambrian.