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The Late Ordovician Period witnessed the second largest mass extinction in the Phanerozoic Eon and the Hirnantian glaciation. To infer ocean redox conditions across the Ordovician-Silurian transition, we measured the U (as δ238U relative to standard CRM145=0‰) and Mo (as δ98Mo relative to standard NIST SRM 3134=+0.25‰) isotope compositions of 26 organic-rich mudrock samples from the Late Ordovician...
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