Uranium Isotope Paleoredox Proxy

Uranium isotopes (238U/235U) have emerged as a proxy to reconstruct the redox conditions of the Earth''s oceans and atmosphere based upon the large isotopic fractionation between reduced U(IV) and oxidized U(VI). Variations in 238U/235U, particularly when recorded in carbonate sediments, can track global trends in marine oxygenation and de-oxygenation. It is unique from other proxies because reduc...