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U-Pb geochronology in zircon (LG-SIMS)

In situ U-Pb geochronology of zircon
Zircon has long been recognized as the most important geochronometer, and several key instrumental features of the CAMECA large-geometry SIMS make it the best suited instrument for zircon U-Pb dating, among which:
  • High mass resolution for peak separation between HfSi molecular ions and Pb isotopes
  • High transmission for analysis of low lead concentration
  • Oxygen flooding for improved sensitivity and highly reproducible analytical conditions
  • Small spot size with high beam density for better lateral resolution
  • Outstanding ion image capability for Pb and U mapping in zircon grains (inhomogeneity, zonation)
From old to (very) young zircon dating with excellent precision

Accurate zircon geochronology with good spatial resolution requires advanced microanalytical tools capable of dating small minerals within their petrographic context and/or domains in single crystals.
Above, first U-Pb direct dating of iron oxide-copper-gold (IOCG) mineralization. Hydrothermal zircon crystals from IOCG-type ore deposits (Lyon Mountain, US).
Data from P.M. Valley et al., Geology 37 (2009), p.223.

Young quarternary zircon is also routinely dated with CAMECA Large Geometry SIMS.
Monazite, apatite, titanite, rutile and baddeleyite are also commonly dated and provide a wide spectrum of geochronological applications, all perfectly addressed by IMS 1300-HR³ and KLEORA Large Geometry SIMS.

To learn more, download our application note: Advanced U-Th-Pb Geochronology with CAMECA Ultra High Sensitivity SIMS.