Paleomagnetic pole from the Yilgarn B (YB) dykes of Western Australia: no longer relevant to Rodinia reconstructions

H.C. Halls, Michael Wingate

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    Abstract

    The paleomagnetic pole from the Yilgarn B (YB) dykes of Western Australia was for many years considered to be the only primary pole for Australia in the interval 1050-700 Ma, and has been used to constrain reconstructions of the Neoproterozoic supercontinent Rodinia. We conducted a detailed paleomagnetic study of one of the YB dykes, resampling the same outcrops from which a positive baked contact test was reported previously. Our results yield a negative baked contact test, and, combined with petrographic and rock magnetic data, indicate that the YB dyke magnetisation is a secondary overprint. The YB dyke pole should no longer be used in testing Rodinia reconstructions. Comparison with the apparent polar wander path for Phanerozoic Australia suggests the YB magnetisation is Mesozoic in age, although rocks along the western margin of the Yilgarn Craton preserve Early Paleozoic Rb-Sr biotite ages. (C) 2001 Elsevier Science B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)39-53
    JournalEarth and Planetary Science Letters
    Volume187
    DOIs
    Publication statusPublished - 2001

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    Rodinia
    magnetization
    dike
    Poles
    poles
    apparent polar wander path
    Magnetization
    supercontinent
    Phanerozoic
    Rocks
    rocks
    rock
    craton
    biotite
    outcrop
    Paleozoic
    cratons
    outcrops
    margins
    intervals

    Cite this

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    title = "Paleomagnetic pole from the Yilgarn B (YB) dykes of Western Australia: no longer relevant to Rodinia reconstructions",
    abstract = "The paleomagnetic pole from the Yilgarn B (YB) dykes of Western Australia was for many years considered to be the only primary pole for Australia in the interval 1050-700 Ma, and has been used to constrain reconstructions of the Neoproterozoic supercontinent Rodinia. We conducted a detailed paleomagnetic study of one of the YB dykes, resampling the same outcrops from which a positive baked contact test was reported previously. Our results yield a negative baked contact test, and, combined with petrographic and rock magnetic data, indicate that the YB dyke magnetisation is a secondary overprint. The YB dyke pole should no longer be used in testing Rodinia reconstructions. Comparison with the apparent polar wander path for Phanerozoic Australia suggests the YB magnetisation is Mesozoic in age, although rocks along the western margin of the Yilgarn Craton preserve Early Paleozoic Rb-Sr biotite ages. (C) 2001 Elsevier Science B.V. All rights reserved.",
    author = "H.C. Halls and Michael Wingate",
    year = "2001",
    doi = "10.1016/S0012-821X(01)00279-5",
    language = "English",
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    journal = "Earth & Planetary Science Letters",
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    TY - JOUR

    T1 - Paleomagnetic pole from the Yilgarn B (YB) dykes of Western Australia: no longer relevant to Rodinia reconstructions

    AU - Halls, H.C.

    AU - Wingate, Michael

    PY - 2001

    Y1 - 2001

    N2 - The paleomagnetic pole from the Yilgarn B (YB) dykes of Western Australia was for many years considered to be the only primary pole for Australia in the interval 1050-700 Ma, and has been used to constrain reconstructions of the Neoproterozoic supercontinent Rodinia. We conducted a detailed paleomagnetic study of one of the YB dykes, resampling the same outcrops from which a positive baked contact test was reported previously. Our results yield a negative baked contact test, and, combined with petrographic and rock magnetic data, indicate that the YB dyke magnetisation is a secondary overprint. The YB dyke pole should no longer be used in testing Rodinia reconstructions. Comparison with the apparent polar wander path for Phanerozoic Australia suggests the YB magnetisation is Mesozoic in age, although rocks along the western margin of the Yilgarn Craton preserve Early Paleozoic Rb-Sr biotite ages. (C) 2001 Elsevier Science B.V. All rights reserved.

    AB - The paleomagnetic pole from the Yilgarn B (YB) dykes of Western Australia was for many years considered to be the only primary pole for Australia in the interval 1050-700 Ma, and has been used to constrain reconstructions of the Neoproterozoic supercontinent Rodinia. We conducted a detailed paleomagnetic study of one of the YB dykes, resampling the same outcrops from which a positive baked contact test was reported previously. Our results yield a negative baked contact test, and, combined with petrographic and rock magnetic data, indicate that the YB dyke magnetisation is a secondary overprint. The YB dyke pole should no longer be used in testing Rodinia reconstructions. Comparison with the apparent polar wander path for Phanerozoic Australia suggests the YB magnetisation is Mesozoic in age, although rocks along the western margin of the Yilgarn Craton preserve Early Paleozoic Rb-Sr biotite ages. (C) 2001 Elsevier Science B.V. All rights reserved.

    U2 - 10.1016/S0012-821X(01)00279-5

    DO - 10.1016/S0012-821X(01)00279-5

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    JO - Earth & Planetary Science Letters

    JF - Earth & Planetary Science Letters

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