RESEARCH FIELD

Geochronology

Geochronology is the science of determining the absolute age of geological materials using the decay of radioactive isotopes and related physical phenomena. It provides the temporal framework for Earth history, enabling geologists to date volcanic eruptions, constrain tectonic events, reconstruct sedimentary basin histories, and calibrate the stratigraphic timescale. Core methods include uranium-lead dating of zircon crystals — the most precise and widely applicable technique extending back 4.4 billion years — argon-argon thermochronology for volcanic and metamorphic rocks, fission-track dating for thermal history reconstruction, cosmogenic nuclide dating for exposure age studies of glacial and geomorphic surfaces, and luminescence dating for sedimentary deposits. Instrument advances including the sensitive high-resolution ion microprobe, laser ablation ICP-MS, and isotope dilution thermal ionisation mass spectrometry have driven precision to sub-percent levels. The field is funded by national geological surveys, academic research councils, and the minerals industry seeking ore deposit timing.