Granites and gabbros at the dawn of a coherent Australian continent

Justin L. Payne, Laura J. Morrissey, Naomi M. Tucker, Lisa K. Roche, Michael A. Szpunar, Regis Neroni

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The Rudall Province in Western Australia is a key crustal component in the amalgamation of the Rodinia supercontinent. New field observations, U–Pb zircon geochronology and geochemistry identify three previously unrecognised Mesoproterozoic magmatic events in the eastern Rudall Province. The Kayilirra Suite formed at ca. 1500 Ma and is a magnesian, calc-alkalic to alkali-calcic and weakly peraluminous suite with a limited SiO2 range of 69–70 wt%. The suite is interpreted to have formed in either a post-tectonic or rift-related setting. The Kalyukuyarra Suite formed at ca. 1185–1165 Ma and was synchronous with a peak in magmatic activity in the along-strike Musgrave Province. The suite is magnesian to ferroan, alkali-calcic and calc-alkalic, high K and peraluminous. Abundant inherited zircon grains indicate a dominantly crustal origin for the suite with only minor interpreted mantle input. Newly identified mafic and felsic magmatism was associated with the ca. 1380–1275 Ma Parnngurr Orogeny and further establishes correlations with the Mount West Orogeny in the Musgrave Province and “Stage 1” of the Albany-Fraser Orogeny. The new data support the progressive, final amalgamation of the Australian-Antarctic crustal fragments during the period ca. 1380–1250 Ma through consumption of oceanic crust below the over-riding West Australian Craton.

Original languageEnglish
Article number106189
JournalPrecambrian Research
Volume359
DOIs
Publication statusPublished - 1 Jul 2021

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