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 emergence and diversification of early animals is commonly thought to have coincided
with atmosphere and ocean oxygenation across the terminal Neoproterozoic and early …

The nine editions of Stable Isotope Geochemistry have appeared over a time span of nearly
50 years. The first edition (1973) appeared as a slim book of 135 pages. Due to the rapid …

To improve estimates of the extent of ocean oxygenation during the late Ediacaran Period,
we measured the U and Mo isotope compositions of euxinic (anoxic and sulfidic) organic …

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 …

A hypothesized rise in oxygen levels in the Neoproterozoic, dubbed the Neoproterozoic
Oxygenation Event, has been repeatedly linked to the origin and rise of animal life …

Life requires a wide variety of bioessential trace elements to act as structural components
and reactive centers in metalloenzymes. These requirements differ between organisms and …

The diversification of metazoans during the latest Neoproterozoic and early Cambrian has
been attributed to, among other factors, a progressive rise in surface oxygen levels …

Widespread marine anoxia is hypothesized as the trigger for the second pulse of the Late
Ordovician (Hirnantian) mass extinction based on lithologic and geochemical proxies 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 …