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    Palaeomagnetism of the 1.89?Ga Boonadgin dykes of the Yilgarn Craton: Possible connection with India

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    Authors
    Liu, Yebo
    Li, Zheng-Xiang
    Pisarevskiy, Sergei
    Kirscher, Uwe
    Mitchell, Ross
    Stark, J. Camilla
    Date
    2018
    Type
    Journal Article
    
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    Citation
    Liu, Y. and Li, Z. and Pisarevskiy, S. and Kirscher, U. and Mitchell, R. and Stark, J. 2018. Palaeomagnetism of the 1.89?Ga Boonadgin dykes of the Yilgarn Craton: Possible connection with India. Precambrian Research. -: pp. ---.
    Source Title
    Precambrian Research
    DOI
    10.1016/j.precamres.2018.05.021
    ISSN
    0301-9268
    School
    School of Earth and Planetary Sciences (EPS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FL150100133
    URI
    http://hdl.handle.net/20.500.11937/68909
    Collection
    • Curtin Research Publications
    Abstract

    A palaeomagnetic study was carried out on the newly identified 1888 ± 9 Ma Boonadgin dyke swarm of the Yilgarn Craton in Western Australia. The Bonnadgin dykes yield a mean direction of magnetisation of D = 143°, I = 13°, k = 37 and a 95 = 8°, based on samples from 10 diabase dykes, with a corresponding palaeopole at 47° S, 235° E, A 95 = 6°. A positive baked contact test establishes the primary nature of the magnetisation. The ca. 1.89 Ga palaeopole suggests that the Yilgarn Craton was near the equator at this time, and the Boonadgin dyke swarm can be interpreted to represent an arm of a radiating dyke swarm that shared the same plume centre with coeval mafic dykes in the Dharwar and Bastar cratons of southern India. We therefore propose that the West Australian Craton (WAC, consisting of the Yilgarn and Pilbara cratons) and the South Indian Block (SIB, consisting of the Dharwar, Bastar, and Singhbhum cratons) were connected ca. 1.89 Ga. Globally, available high-quality palaeopoles of similar age allow the West Australian Craton to be placed northwest of proto-Laurentia during the assembly of the supercontinent Nuna.

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