The tectonic development and erosion of the Knox Subglacial Sedimentary Basin, East Antarctica

A. Maritati, A.R.A. Aitken, D. A. Young, J. L. Roberts, D. D. Blankenship, M. J. Siegert

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    Abstract

    Sedimentary basins beneath the East Antarctic Ice Sheet (EAIS) have immense potential to inform models of the tectonic evolution of East Antarctica and its ice-sheet. However, even basic characteristics such as thickness and extent are often unknown. Using airborne geophysical data, we resolve the tectonic architecture of the Knox Subglacial Sedimentary Basin in western Wilkes Land. In addition, we apply an erosion restoration model to reconstruct the original basin geometry for which we resolve geometry typical of a transtensional pull-apart basin. The tectonic architecture strongly indicates formation as a consequence of the rifting of India from East Gondwana from ca. 160-130 Ma, and we suggest a spatial link with the western Mentelle Basin offshore Western Australia. The erosion restoration model shows that erosion is confined within the rift margins, suggesting that rift structure has strongly influenced the evolution of the Denman and Scott ice streams.

    Original languageEnglish
    Pages (from-to)10,728-10,737
    Number of pages717
    JournalGeophysical Research Letters
    Volume43
    Issue number20
    DOIs
    Publication statusPublished - 28 Oct 2016

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