The Antarctic continent mapped by global similarity association

Staal, Tobias; Reading, Anya M.; Cracknell, Matthew J.; Ebbing, Jörg; Halpin, Jacqueline A.; Kelly, Ian; MacKie, Emma; Sobh, Mohamed; Turber, Ross; Whittaker, Joanne M.

doi:10.57757/IUGG23-2140

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The Antarctic continent mapped by global similarity association

Authors

Staal, Tobias
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Reading, Anya M.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Cracknell, Matthew J.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ebbing, Jörg
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Halpin, Jacqueline A.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kelly, Ian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

MacKie, Emma
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Sobh, Mohamed
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Turber, Ross
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Whittaker, Joanne M.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Staal, T., Reading, A. M., Cracknell, M. J., Ebbing, J., Halpin, J. A., Kelly, I., MacKie, E., Sobh, M., Turber, R., Whittaker, J. M. (2023): The Antarctic continent mapped by global similarity association, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2140

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018659

Abstract

The geology of Antarctica is formed from cratons, accreted terranes from multiple supercontinental cycles, and ongoing tectonism and glaciation. It would be a mistake to assume that the subglacial continent is geologically less complex than any other part of the world. Geophysical data and the observed interaction between the solid Earth and the ice sheet suggest several distinct geological regions in the interior. Antarctica's margins have been affiliated with geological observations in adjoint Gondwana neighbours, and those projections identify Antarctica as a hub in the supercontinent cycle rather than a snowbank at the margin of the map. However, producing a robust tectonic map of the interior is challenging, as existing datasets and models are inconsistent and the interpretations ambiguous.  We map the tectonic domains of the Antarctic continent by applying a similarity approach. From multivariate observables in other continents, we calculate the most similar tectonic setting for each location in Antarctica and assign discreet distributions of tectonic classes. Observables include potential field data, seismic tomography, and, where applicable, geological observations. We use information entropy and cost function to optimise and evaluate the robustness of the model. Our results refine and redefine the tectonic map of the interior.