Relationship between northwestern Tasmania and East Gondwanaland in the Late Cambrian/Early Ordovician: Paleomagnetic evidence

Zheng-Xiang Li, Peter Baillie, C.M. Powell

    Research output: Contribution to journalArticle

    30 Citations (Scopus)

    Abstract

    The 71 samples from 11 sites in the lower Upper Cambrian turbiditic red siltstone and mudstone of northwestern Tasmania have revealed a high-temperature component which passes a fold test, indicating an age older than Late Devonian. The mean direction of D = 58.3 degrees, I = 11.1 degrees, alpha(95) = 10.4 degrees, k = 20.2, is interpreted as of primary or early diagenetic origin, and gives a paleomagnetic pole position at (19.4 degrees S, 28.9 degrees E) with DP = 5.3 degrees, DM = 10.5 degrees. This pole position falls on the Late Cambrian to Early Ordovician part of the East Gondwanaland apparent polar wander path, indicating that if northwestern Tasmania were separated from East Gondwanaland during the Neoproterozoic breakup of the supercontinent Rodinia, it had been accreted to East Gondwanaland by at least the Early Ordovician. Two overprint poles, one at (50.4 degrees S, 177.4 degrees E) with DP = 6.5 degrees, DM = 6.9 degrees, and the other at (62.0 degrees S, 102.6 degrees E) with DP = 9.9 degrees, DM = 11.3 degrees, suggest that there could have been more than one overprinting event in the region during the breakup between Australia and Antarctica in the late Mesozoic and early Tertiary.
    Original languageEnglish
    Pages (from-to)161-171
    JournalTectonics
    Volume16
    Issue number1
    DOIs
    Publication statusPublished - 1997

    Fingerprint

    Tasmania
    Ordovician
    Poles
    poles
    apparent polar wander path
    Rodinia
    overprinting
    supercontinent
    siltstone
    mudstone
    Antarctic regions
    fold
    Temperature
    Antarctica
    test

    Cite this

    @article{bb82a465e4e44e37805b4ebff711fdfa,
    title = "Relationship between northwestern Tasmania and East Gondwanaland in the Late Cambrian/Early Ordovician: Paleomagnetic evidence",
    abstract = "The 71 samples from 11 sites in the lower Upper Cambrian turbiditic red siltstone and mudstone of northwestern Tasmania have revealed a high-temperature component which passes a fold test, indicating an age older than Late Devonian. The mean direction of D = 58.3 degrees, I = 11.1 degrees, alpha(95) = 10.4 degrees, k = 20.2, is interpreted as of primary or early diagenetic origin, and gives a paleomagnetic pole position at (19.4 degrees S, 28.9 degrees E) with DP = 5.3 degrees, DM = 10.5 degrees. This pole position falls on the Late Cambrian to Early Ordovician part of the East Gondwanaland apparent polar wander path, indicating that if northwestern Tasmania were separated from East Gondwanaland during the Neoproterozoic breakup of the supercontinent Rodinia, it had been accreted to East Gondwanaland by at least the Early Ordovician. Two overprint poles, one at (50.4 degrees S, 177.4 degrees E) with DP = 6.5 degrees, DM = 6.9 degrees, and the other at (62.0 degrees S, 102.6 degrees E) with DP = 9.9 degrees, DM = 11.3 degrees, suggest that there could have been more than one overprinting event in the region during the breakup between Australia and Antarctica in the late Mesozoic and early Tertiary.",
    author = "Zheng-Xiang Li and Peter Baillie and C.M. Powell",
    year = "1997",
    doi = "10.1029/96TC02729",
    language = "English",
    volume = "16",
    pages = "161--171",
    journal = "Tectonics",
    issn = "0278-7407",
    publisher = "American Geophysical Union",
    number = "1",

    }

    Relationship between northwestern Tasmania and East Gondwanaland in the Late Cambrian/Early Ordovician: Paleomagnetic evidence. / Li, Zheng-Xiang; Baillie, Peter; Powell, C.M.

    In: Tectonics, Vol. 16, No. 1, 1997, p. 161-171.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Relationship between northwestern Tasmania and East Gondwanaland in the Late Cambrian/Early Ordovician: Paleomagnetic evidence

    AU - Li, Zheng-Xiang

    AU - Baillie, Peter

    AU - Powell, C.M.

    PY - 1997

    Y1 - 1997

    N2 - The 71 samples from 11 sites in the lower Upper Cambrian turbiditic red siltstone and mudstone of northwestern Tasmania have revealed a high-temperature component which passes a fold test, indicating an age older than Late Devonian. The mean direction of D = 58.3 degrees, I = 11.1 degrees, alpha(95) = 10.4 degrees, k = 20.2, is interpreted as of primary or early diagenetic origin, and gives a paleomagnetic pole position at (19.4 degrees S, 28.9 degrees E) with DP = 5.3 degrees, DM = 10.5 degrees. This pole position falls on the Late Cambrian to Early Ordovician part of the East Gondwanaland apparent polar wander path, indicating that if northwestern Tasmania were separated from East Gondwanaland during the Neoproterozoic breakup of the supercontinent Rodinia, it had been accreted to East Gondwanaland by at least the Early Ordovician. Two overprint poles, one at (50.4 degrees S, 177.4 degrees E) with DP = 6.5 degrees, DM = 6.9 degrees, and the other at (62.0 degrees S, 102.6 degrees E) with DP = 9.9 degrees, DM = 11.3 degrees, suggest that there could have been more than one overprinting event in the region during the breakup between Australia and Antarctica in the late Mesozoic and early Tertiary.

    AB - The 71 samples from 11 sites in the lower Upper Cambrian turbiditic red siltstone and mudstone of northwestern Tasmania have revealed a high-temperature component which passes a fold test, indicating an age older than Late Devonian. The mean direction of D = 58.3 degrees, I = 11.1 degrees, alpha(95) = 10.4 degrees, k = 20.2, is interpreted as of primary or early diagenetic origin, and gives a paleomagnetic pole position at (19.4 degrees S, 28.9 degrees E) with DP = 5.3 degrees, DM = 10.5 degrees. This pole position falls on the Late Cambrian to Early Ordovician part of the East Gondwanaland apparent polar wander path, indicating that if northwestern Tasmania were separated from East Gondwanaland during the Neoproterozoic breakup of the supercontinent Rodinia, it had been accreted to East Gondwanaland by at least the Early Ordovician. Two overprint poles, one at (50.4 degrees S, 177.4 degrees E) with DP = 6.5 degrees, DM = 6.9 degrees, and the other at (62.0 degrees S, 102.6 degrees E) with DP = 9.9 degrees, DM = 11.3 degrees, suggest that there could have been more than one overprinting event in the region during the breakup between Australia and Antarctica in the late Mesozoic and early Tertiary.

    U2 - 10.1029/96TC02729

    DO - 10.1029/96TC02729

    M3 - Article

    VL - 16

    SP - 161

    EP - 171

    JO - Tectonics

    JF - Tectonics

    SN - 0278-7407

    IS - 1

    ER -