Petrogenesis of Proterozoic alkaline ultramafic rocks in the Yilgarn Craton, Western Australia
Eunjoo Choi, Marco L Fiorentini, Andrea Giuliani, Stephen F Foley, Roland Maas, Stuart Graham
GONDWANA RESEARCH | ELSEVIER | Published : 2021
The Yilgarn Craton and its northern margin contain a variety of petrogenetically poorly defined small-volume alkaline ultramafic rocks of Proterozoic age. This study documents the petrography, mineral and bulk-rock geochemistry and Nd-Hf-Sr-Pb isotope compositions of a selected suite of these rocks. They comprise ~2.03–2.06 Ga ultramafic lamprophyres (UML) and carbonatites from the Eastern Goldfields Superterrane (EGS), ~0.86 Ga UML from Norseman, and orangeites from the Earaheedy Basin, including samples from Jewill (~1.3 Ga), Bulljah (~1.4 Ga) and Nabberu (~1.8–1.9 Ga). The Proterozoic UML and carbonatites from the EGS and Norseman display very consistent chondritic to superchondritic Nd-H..View full abstract
Awarded by Australian Research Council 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 through the Centre of Excellence for Core to Crust Fluid Systems (CE1100001017), as well as the Minerals Research Institute ofWestern Australia. The authors thank Mark Mitchell (DeBeers) for the donation of samples used in this study. The authors acknowledge the technical, and the scientific assistance from the Australian Microscopy & microanalysis Research Facility at the Centre forMicroscopy, Characterisation & Analysis of The University of Western Australia. Comprehensive reviews by Chalapathi Rao and Hugh O'Brien, and careful editorial handling by Sebastian Tappe greatly improved the final version of this paper. This is contribution 1555 from the ARC Centre of Excellence for Core to Crust Fluid Systems (http://www.ccfs.mq.edu.au) and 1419 in the GEMOC Key Centre (http://www.gemoc.mq.edu.au), and part of the PhD thesis of EC, who acknowledges the support of the University ofWestern Australia through an RTS scholarship.