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Twenty-eight subsamples from a relict chimney and massive sulfides were dated using the U method.
Four main episodes of hydrothermal activity were determined according to the restricted results: 68.9–84.3, 43.9–48.4, 25.3–34.8, and 0.7–17.3 kyrs.
We use U-Th dating to obtain a chronology for stalagmites which are used for palaeoclimate research (pdf), dating carbonate crusts on cave art to derive minimum age constraints for underlying art(paper Hoffmann et al. (2012) (DOI: 10.1126/science.1219957), speleothem formations in stratigraphic relationship with archaeological artefacts, travertine formation in relation with archaeology.
The U-series disequilibrium method is based on the radioactive decay of radionuclides within the naturally occurring decay chains.
When Becquerel (1896) accidentally placed a uranium sample on a photographic plate, he found the plate to be partially exposed.
This startling discovery led to the discovery of radioactivity.
In many cases the radiation is in the form of extremely short-wavelength gamma radiation, and also there are often particles, alpha (helium nuclei) or beta (electrons), that can have considerable energies.
These radiations and particles interact with other particles, transferring energy that ultimately becomes heat in the material that has absorbed the radiation.
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A Canadian research team has used a new uranium-lead (U-Pb) dating technique to show that a fossilised dinosaur bone found in New Mexico is only 64.8 million years old, meaning the creature was alive about 700,000 years after the mass extinction event that is believed to have wiped out all non-avian dinosaurs.