Trace element and isotopic composition of GJ-red zircon standard by laser ablation

U-Pb zircon dating by laser ablation requires a reliable matrix-matched external standard to correct for instrumental isotopic fractionation. The most commonly used reference material, the 91500 zircon from Ontario, i s almost exhausted, and GEMOC has searched for a suitable alternative zircon standard for U-Pb dating. G & J Gem Merchants (Sydney) donated a parcel of large zircon fragments (~1cm across), believed to be from E. African...