%0 Journal Article %J Geochimica et Cosmochimica Acta %D 2024 %T Uranium isotopes in non-euxinic shale and carbonate reveal dynamic Katian marine redox conditions accompanying a decrease in biodiversity prior to the Late Ordovician mass extinction %A X Lu %A G Gilleaudeau %A B Kendall %B Geochimica et Cosmochimica Acta %V 364 %P 22-43 %G eng