The Neoproterozoic Datangpo Formation of the Nanhua Basin in South China records interglacial sedimentation between the ~720-660-Ma Sturtian and ~654-635-Ma Marinoan glaciations. The lower part (1 st Member) of this formation contains manganese-rich deposits that represent a mixture of two main components, Mn-carbonates and Mn-bearing aluminosilicates (clay minerals). The Mn-carbonate component is characterized by high La/Sc ratios, high initial 87 Sr/ 86 Sr ratios, and low initial εNd(t) values, and the siliciclastic component by low La/Sc ratios, low initial 87 Sr/ 86 Sr ratios, and high initial εNd(t) values. The likely source of the non-radiogenic
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