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The role of inheritance and kinematics in shaping the West Antarctica Rift System (WARS): A parametric study

Authors

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

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

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

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

De Santis,  Laura
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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Citation

Pastorutti, A., Tesauro, M., Braitenberg, C., Colleoni, F., De Santis, L., Busetti, M. (2023): The role of inheritance and kinematics in shaping the West Antarctica Rift System (WARS): A parametric study, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2599


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019300
Abstract
Extensional tectonics in continental settings usually results in lithospheric stretching of narrow (e.g. Upper Rhine Graben), as well as wide regions (e.g. Basin and Range). Some rift systems bear evidence of a transition between the two styles: the West Antarctica Rift System (WARS) have likely progressed from diffuse to focused rifting (Cretaceous - Middle Neogene). The system currently covers a length of 1000 km, at the boundary between East and West Antarctica and is composed of four main basins (Victoria Land Basin, Central Trough, Northern Basin and Eastern Basin). The deformation pattern and available geological reconstructions suggest that, at least for some part of the rifting, the extension occurred concurrently in multiple sections.Inheritance of prior structural, thermal, and rheological heterogeneities is likely a controlling factor in this evolution [1]. Consequently, with the goal of identifying the most likely initial conditions, we designed a series of 2-D numerical models, analysing the effect of variations in the temperature field, rheology, accumulated strain, distribution of extensional pulses on the basins’ geometry. To this aim, we used the open source Underworld2 [2] and BGR-02 and ACRUP2 profiles [3], as 2-D analogue of the WARS structures in the Southern Ross Sea.The results show that the models most consistent with the observations are those that include inherited weakness zones at the cratonic boundary. Early onset of focused extension often occurs, with high sensitivity to the pattern of inherited weakening.[1] Perron et al. (2021). DOI:10.1051/bsgf/2020038[2] Mansour et al. (2020). DOI:10.21105/joss.01797[3] Trey et al. (1999). DOI:10.1016/S0040-1951(98)00155-3