Remarkable expansion of seafloor anoxia during Mid-Late Ordovician cooling caused concurrent decline of biodiversity
This study investigated two Mid-Ordovician shale-dominated successions from the intra-shelf basin (Zhenjin section) and slope (Anye-1 core) settings of the Yangtze Sea in South China, with a novel combination of iron speciation, trace metals, bulk δ15N and pyrite δ34S (Fig. 1). And, for the first time, δ98Mo profile was produced for the Mid-Ordovician black shale in South China.
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