Carbonate sediments and rocks are valuable archives of Earth's past whose geochemical
compositions inform our understanding of Earth's surface evolution. Yet carbonates are also …

Radiocarbon dating is the most widely used dating technique in the world. Recent advances
in Accelerator Mass Spectrometry (AMS) and sample preparation techniques have reduced …

The present-day 238U/235U ratio has fundamental implications for uranium-lead
geochronology and cosmochronology. A value of 137.88 has previously been considered …

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 have developed techniques to measure the 230 Th abundance in corals by isotope
dilution mass spectrometry. This, coupled with our previous development of 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 …

We have re-determined the 234U and 230Th half-lives to be 245,250±490 years (2σ) and
75,690±230 years (2σ), respectively. Using high precision thermal ionization mass …

To facilitate the measurement of U–Th isotopic compositions suitable for high-precision and
high-resolution 230Th dating of coral and speleothem carbonates, secondary electron …

A major term in the global carbon cycle is the ocean's biological carbon pump which is
dominated by sinking of small organic particles from the surface ocean to its interior. Several …

There have been significant changes in sea level over the past two million years, and a
complete understanding of natural cycles of change as well as anthropogenic effects is …