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 reduction primarily occurs at the sediment-water interface,
and this sensitivity makes U isotopes especially relevant for the
habitability of benthic animals. This Element covers the
background, methods, and case studies of this promising tool for
understanding Earth's environmental transitions, as rapid
development continues to refine the accuracy of interpretations of
238U/235U records.
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