The scenic rim of southeastern Queensland, Australia: A history of mid Cenozoic intraplate volcanism

A study of the Scenic Rim in southeastern Queensland, Australia, reveals a detailed history of mid Cenozoic intraplate volcanism linked to significant changes in the Australian plate's velocity. The research indicates that a major slowdown in plate movement began around 26 million years ago and lasted until 23 million years ago, coinciding with the collision of the Ontong Java plateau with the northern subduction margin of the Australian plate. Trace element and isotopic analyses show minimal contamination for most volcanic units, except rhyolites formed during the slow plate velocity period. The study also highlights the presence of highly evolved rocks, such as comendites, with extreme concentrations of incompatible elements, and provides insights into the melting and mixing processes in the upper mantle and lower crust. The region's diverse landscapes and wildlife habitats, including parts of the World Heritage listed Gondwana Rainforests, offer excellent exposures of subsurface magmatic architecture.

Cohen, B. E. (2012). The scenic rim of southeastern Queensland, Australia: A history of mid Cenozoic intraplate volcanism. Episodes, 35(1), 103–109. https://doi.org/10.18814/epiiugs/2012/v35i1/009