%0 Journal Article %J Geochimica et Cosmochimica Acta %D 2021 %T New constraints on mid-Proterozoic ocean redox from stable thallium isotope systematics of black shales %A Z Li %A DB Cole %A SM Newby %A JD Owens %A B Kendall %A CT Reinhard %B Geochimica et Cosmochimica Acta %V 315 %P 185-206 %G eng