Ordos Basin is the second largest sedimentary basin in China with gigantically thick Paleozoic marine sedimentary strata. Geochemical analyses show that the carbon isotope compositions of the Ordovician are less influenced by postdepositional diagenesis and basically accordant with that of the global Ordovician. δ 13 C values range from Ϫ7.30‰ to 2.26‰ with a mean value of Ϫ0.30‰. Temporally, δ 13
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