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Mineral Resources Tasmania

Tasmanian Geochronology Compilation Published

This Tasmanian geochronology compilation comprises a total of 878 ages, chronicling the evolution of onshore Tasmania from Mesoproterozoic deposition of sedimentary successions in western King Island, through to Neogene basaltic volcanism in Bass Strait and its margins. Most ages in this compilation document the evolution of the Delamerian Orogen and Lachlan Orogen in the interval 520–350 Ma, and these Paleozoic ages were predominantly determined using the Rb–Sr, K–Ar, and U–Pb isotopic systems. Ages younger than 320 Ma largely comprise K–Ar and Ar–Ar analyses documenting Mesozoic post-orogenic uplift and cooling, and Mesozoic to Cenozoic basaltic volcanism.

This Isotopic Atlas draws together age and isotopic data from across the country and provides visualisations and tools to enable users to extract maximum value from these datasets. Data is added to the Isotopic Atlas in a staged approach with priorities determined by GA- and partner-driven focus regions and research questions. The Tasmanian dataset represents the second in a series of compilation publications (Records and Datasets) for the southern states of Australia, produced during the second phase of the Exploring for the Future (EFTF) initiative over 2020–2024.