The biogeochemical cycling of metals in natural systems is often accompanied by stable
isotope fractionation which can now be measured due to recent analytical advances. In …

This review focuses on the rapidly growing field of natural 238U/235U variability, largely
driven by the technical advances in the measurement of U isotope ratios by mass …

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 …

Stable mercury (Hg) isotope ratios are an emerging tracer for biogeochemical
transformations in environmental systems, but their application requires knowledge of …

Isotopic variations usually follow mass-dependent fractionation, meaning that the relative
variations in isotopic ratios scale with the difference in mass of the isotopes involved (eg …

The 238 U/235 U isotopic composition of uranium in seawater can provide important insights
into the modern U budget of the oceans. Using the double spike technique and a new data …

Uranium is an important carbon-free fuel source and environmental contaminant that
accumulates in the tetravalent state, U (IV), in anoxic sediments, such as ore deposits …

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 …

Uranium isotopic signatures in the rock record are utilized as a proxy for past redox
conditions on Earth. However, these signatures display significant variability that …

The protracted oxygenation of the ocean-atmosphere system is one of the most fundamental
changes to the Earth system through its history. The uranium isotopic composition (238 …