This Record presents isotope and trace elements data collected on apatite and monazite at the Australian Research Council Centre of Excellence in Ore Deposits (CODES) at the University of Tasmania. Apatite and monazite from different petrographic settings were analysed in order to constrain the timing of metamorphism and deformation across the Bruna shear zone.
The Bruna Shear Zone of the Entia Dome juxtaposes the hanging wall Neoproterozoic–Carboniferous Irindina Province over the footwall Palaeoproterozoic Aileron Province. The study found that monazite of the Bruna Shear Zone hanging wall Yambla Gneiss formed at ca 460 Ma, most likely during peak-metamorphism (Larapinta Event?). New monazite and apatite formed in the same sample at ca 355– 350 Ma after peak-metamorphism and shearing, possibly driven by fluids and heat from nearby intrusions. Post-kinematic apatite from the footwall formed between 320–305 Ma, assisted by magmatic and hydrothermal fluids.
Download NTGS Record 2024-001: In situ LA-ICP-MS apatite and monazite U-Pb geochronology of the Entia Dome, Aileron and Irindina provinces, Central Australia from GEMIS.