The concentrations of U in natural waters are usually low, being typically less than 4 μg/L in
river water, around 3.3 μg/L in open seawater, and usually less than 5 μg/L in groundwater …

Trace elements are actively cycled in seawater, are essential components for marine life,
and are transported to the seafloor where they can become enriched in marine sediments …

Delayed Earth system recovery following the end-Permian mass extinction is often attributed
to severe ocean anoxia. However, the extent and duration of Early Triassic anoxia remains …

Uranium contamination of soil has been a major concern with respect to its toxicity,
accumulation in the food chain and persistence in the environment. Owing to these …

Field biostimulation experiments at the US Department of Energy's Integrated Field
Research Challenge (IFRC) site in Rifle, Colorado, have demonstrated that uranium …

In order to validate the use of 238 U/235 U as a paleoredox proxy in carbonates, we
examined the incorporation and early diagenetic evolution of U isotopes in shallow …

Knowledge of paleo-redox conditions in the Earth's history provides a window into events
that shaped the evolution of life on our planet. The role of microbial activity in paleo-redox …

Redox transitions of uranium [from U (VI) to U (IV)] in low-temperature sediments govern the
mobility of uranium in the environment and the accumulation of uranium in ore bodies, and …

Anoxic marine zones were common in early Paleozoic oceans (542–400 Ma), and present a
potential link to atmospheric pO 2 via feedbacks linking global marine phosphorous …

The geochemistry of the carbonate sedimentary record is invaluable for understanding the
ancient seawater evolution of carbon and redox-sensitive elements. However, the …