Intracratonic Orogeny in Mesoproterozoic Australia

Martin Hand
Continental Evolution Research Group, Geology and Geophysics, School of Earth and Environmental Sciences, University of Adelaide.

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Introduction

The Early Mesoproterozoic (1600 Ma – 1570 Ma) was a period of widespread compressional tectonism and high geothermal gradient metamorphism in the Australian Proterozoic. In the eastern half of the North Australian Craton, the bulk of Palaeoproterozoic terrains underwent high-temperature tectonism between 1600 Ma to 1550 Ma. In central Australia, the Chewings Orogeny (1600 Ma – 1570 Ma) was associated with approximately north-south shortening coeval with regional low-pressure high-temperature metamorphism up to granulite grade. In northeastern Australia, the Early Isan (1600 Ma – 1580 Ma), and Ewamin-Janan Orogenies (1585 Ma – 1555 Ma) in the Mt Isa and Georgetown and Yambo Inliers, respectively, were also associated with approximately north-south shortening and high geothermal gradient metamorphism. In the southern Australian Proterozoic, the Olarian Orogeny (1610 Ma – 1585 Ma) in the Curnamona Province was also characterised by high geothermal gradient metamorphism.

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Related links

Evolution and metallogenesis of the North Australian Craton Conference Abstracts