Age and geochemistry of the Boucaut Volcanics in the Neoproterozoic Adelaide Rift Complex, South Australia

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Sheree Ellen Armistead , Alan S. Collins , Solomon Buckman, Rachel Atkins


The Adelaide Rift Complex in South Australia records the break-up of Rodinia at a time of great climatic and biological evolution. The Boucaut Volcanics within the Neoproterozoic Adelaide Rift Complex of the Adelaide Superbasin lie at the base of the Burra Group, marking the boundary between the Burra Group and underlying Callanna Group. Despite their significance as one of the few volcanic units within the rift complex, there has been no robust age determination published for the Boucaut Volcanics. We use U–Pb zircon LA-ICP-MS data to determine an age of 788 ± 6 Ma for the eruption of the bimodal Boucaut Volcanics. This has important implications for constraining the timing of stratigraphy within the Adelaide Superbasin. This also has far reaching implications for plate tectonic reconstructions of Australia and Laurentia, and for correlating global isotope anomalies for the Neoproterozoic.



Earth Sciences, Geology, Physical Sciences and Mathematics


volcanic, Geology, geochemistry, Adelaide Rift Complex, Australia, Boucaut, Flinders Ranges, Geochronology, Neoproterozoic, Rodinia, Snowball Earth


Published: 2020-07-15 15:46

Last Updated: 2020-08-12 16:06

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CC BY Attribution 4.0 International

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Data available upon request and will be uploaded when the manuscript is published

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