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 …

Water plays a critical role in erosion and sediment transport and this relationship is most
evident in the hyperarid Atacama Desert of Northern Chile, a region characterized by …

The black shale submember of core shales of Pennsylvanian Kansas-type cyclothems is
highly enriched in redox-sensitive trace elements (TEs) relative to the overlying gray shale …

Modern low-oxygen marine systems exhibit patterns of molybdenum–uranium covariation
that can be linked to specific attributes and processes of the depositional system, including …

We analyzed the redox sensitive elements V, Mo, U, Re and Cd in surface sediments from
the Northwest African margin, the US Northwest margin and the Arabian Sea to determine …

Molybdenum and vanadium are relatively unreactive in seawater and are preferentially
concentrated in sediments overlain by anoxic or near-anoxic waters. We investigate the …

Uranium is removed from the oceans by diffusion across the sediment-water interface of
organic-rich sediments. This pathway is the largest single sink in the global budget of this …

The atmosphere–ocean system experienced a progressive change from anoxic to more
oxidizing conditions through time. This oxidation is traditionally envisaged to have occurred …

The isotopic composition of U in nature is generally assumed to be invariant. Here, we report
variations of the 238U/235U isotope ratio in natural samples (basalts, granites, seawater …

The terminal Ediacaran Period witnessed the decline of the Ediacara biota (which may have
included many stem-group animals). To test whether oceanic anoxia might have played a …