Modelling the lithospheric rheology control on Cretaceous rifting in West Antarctica.

M. Bonini, G. Corti, C. DelVentisette, P. Manetti, G. Mulugeta, D. Sokoutis

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    Small-scale analogue models were used to investigate the process of Cretaceous orthogonal extension in the West Antarctic Rift System. The models considered the transition from the East Antarctic Craton to a weaker lithosphere, and the results support previous hypotheses about the strong control exerted by lateral variations in lithospheric structures on the process of extension. Strain was mostly accommodated at the boundary between the two types of lithosphere, with a relative uplift of the cratonic block which remained essentially undeformed. Conversely, the weaker lithosphere showed wide-rifting style geometry, locally associated with core complex-like structures. In agreement with the natural prototype, this tectonic scenario led to a long-lasting extension without continental break-up, and to the absence of relevant surface magmatism. © 2007 Blackwell Publishing Ltd.
    Original languageEnglish
    Pages (from-to)360-366
    JournalTerra Nova
    Volume19
    DOIs
    Publication statusPublished - 2007

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