The Geochronology Section is a state-of-the-art facility specializing in analysis and geological application of radiogenic isotopic systems (U-Th-Pb, ⁴⁰Ar-³⁹Ar, Rb-Sr and Sm-Nd). The facility carries out an extensive geochronological research program focused on the U-Th-Pb system in zircon and other accessory minerals and the ⁴⁰Ar/³⁹Ar method; both methods have in situ analytical capabilities. In addition, Nd, Pb and Sr isotopes are used as tracers of crust and mantle source materials.

Research thrusts pursued in the Geochronology Section are:

• Development and applications of microanalytical geochronology.
• Systematics of radiogenic elements and their daughter products in geological processes.
• Regional geochronology and isotopic tracers; providing correlation and solving field-based questions; dating of metamorphism and unraveling cooling and uplift histories of orogenic belts; provenance of sedimentary and igneous rocks; basin evolution.
• Age and origin of ore deposits.
• Isotopic composition as tracers in environmental and biogeochemical applications.

An annual publication entitled "Current Research - Radiogenic Age and Isotopic Studies", now available on CD-ROM, presents papers on recent analytical developments in the laboratories, as well as a selection of reports on current research projects. Copies are available from the GSC Information Division. A comprehensive listing of publications can be found in Publications.