Subduction-related petrogenesis of Late Archean calc-alkaline lamprophyres in the Yilgarn Craton (Western Australia)
Eunjoo Choi, Marco L Fiorentini, Andrea Giuliani, Stephen F Foley, Roland Maas, Wayne R Taylor
PRECAMBRIAN RESEARCH | ELSEVIER | Published : 2020
We present a comprehensive petrographic, mineralogical and geochemical study of calc-alkaline lamprophyres (CAL) from the Archean Yilgarn Craton, Western Australia. Previous studies have shown that the emplacement age of CAL from the Eastern Goldfields Superterrane of the Yilgarn Craton is ~2684 to ~2640 Ma. A new Rb/Sr mica age for a CAL sample in the Western Yilgarn is ~2070 Ma. Both Archean and Proterozoic CAL analysed in this study display porphyritic textures and contain phenocrysts of amphibole, minor clinopyroxene and biotite in a fine-grained groundmass dominated by feldspar. High MgO, Ni and Cr abundances (up to 11.9 wt%, 373 and 993 ppm. respectively) are consistent with derivation..View full abstract
Awarded by Australian Research Council (ARC) through the Centre of Excellence for Core to Crust Fluid Systems
This work was financially supported by the Australian Government Research Training Program Scholarship, the Australian Research Council (ARC) through the Centre of Excellence for Core to Crust Fluid Systems (CE1100001017), as well as the Minerals Research Institute of Western Australia. The authors acknowledge the technical, and the scientific assistance from the Australian Microscopy & microanalysis Research Facility at the Centre for Microscopy, Characterisation & Analysis of The University of Western Australia. This is contribution 1408 from the ARC Centre of Excellence for Core to Fluid Systems (http://www.ccfs.mq.edu.au) and 1353 in the GEMOC Key Centre (http://www.gemoc.mq.edu.au). This is part of the PhD thesis of EC, who acknowledges the support of the University of Western Australia through a RTS scholarship.