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Original Research ARTICLE
In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. The cratonic elements of proto-Australia, East Antarctica, and Laurentia constitute the nucleus of the Palaeo-Mesoproterozoic supercontinent Nuna, with the eastern margin zirco the Mawson Continent South Australia and East Antarctica positioned adjacent to the western margin of Laurentia.
Such reconstructions of Nuna fundamentally rely on palaeomagnetic and geological evidence. Models for Palaeoproterozoic amalgamation between Australia, East Antarctica, and Laurentia are based in part on zircon dating shrimp interpretation that eclogite-facies metamorphism and, therefore, collisional orogenesis, occurred in the Nimrod Complex of the central Transantarctic Mountains at c. However, new zircon petrochronological data from relict eclogite preserved in the Nimrod Complex indicate that high-pressure metamorphism did not occur in the Palaeoproterozoic, but instead occurred during early Palaeozoic Ross orogenesis along the active convergent margin of East Gondwana.
Relict c. Therefore, rather than a Palaeoproterozoic c.
Evidence for the existence of the ancient supercontinent Nuna is based in part on the occurrence of 2. Although the timing of Nuna amalgamation is debated, with competing estimates of either — Ma 456789 or c.
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The interpretation of a collisional Mawson margin hinges on the occurrence of Palaeoproterozoic eclogite-facies rocks in the Miller Range zircon dating shrimp the central Transantarctic Mountains Nimrod Complex 13 The importance of eclogite-facies rocks within Nuna reconstructions was recently emphasized by Wan et al. Eclogites are crucial markers of subduction-style orogenic processes 19 and the c. Palaeogeographic reconstruction of Nuna modified after Zhang et al.
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Ziecon approximate boundary of the Mawson Continent is shown with a dashed line The modern position of the Miller Range is shown by the inset map. The previously interpreted occurrence of c. Here, we present new petrochronological data from a second, previously studied Palaeoproterozoic eclogite from the Miller Range showing that the Palaeoproterozoic-aged zircons did not form during high-pressure metamorphism.
These new findings remove critical evidence used to infer c.]
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