Geochronology and paleomagnetism of mafic igneous rocks in the Olenek Uplift, nothern Siberia: Implications for Mesoproterozoic supercontinents and paleogeography

Michael Wingate, Sergei Pisarevsky, D.P. Gladkochub, T.V. Donskaya, K.M. Konstantinov, A.M. Mazukabzov, A.M. Stanevich

    Research output: Contribution to journalArticle

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    Abstract

    We present a new, reliably dated Mesoproterozoic paleopole for Siberia, based on a combined geochronological and paleomagnetic study of mafic rocks within the Mesoproterozoic Sololi Group of the Olenek Uplift in northern Siberia. Ion microprobe (SHRIMP) U–Pb analysis yields crystallisation ages of 2036 ± 11 Ma for zircon from a basement granite and 1473 ± 24 Ma for baddeleyite from a large dolerite sill within the Kyutingde Formation. The baddeleyite result indicates that the lower Sololi Group is significantly older than was suggested by previous K–Ar results. Paleomagnetic analysis of the dolerite sill and related mafic intrusive rocks yields a paleopole at 33.6°N, 253.1°E, A95 = 10.4°. A positive baked-contact test between the Kyutingde sill and sedimentary country rocks shows that the magnetisation is primary. Comparison of this paleopole with coeval results for Laurentia provides a revised reconstruction between Siberia and Laurentia, and implies that these two continents were parts of a single Mesoproterozoic supercontinent since at least 1473 Ma. We argue that Siberia, Laurentia, and Baltica belonged to the same supercontinent between 1473 Ma and mid-Neoproterozoic time.
    Original languageEnglish
    Pages (from-to)256-266
    JournalPrecambrian Research
    Volume170
    Issue number3-4
    DOIs
    Publication statusPublished - 2009

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    Geochronology
    Igneous rocks
    Laurentia
    supercontinent
    paleomagnetism
    paleogeography
    mafic rock
    sill
    geochronology
    igneous rock
    baddeleyite
    uplift
    Rocks
    diabase
    Baltica
    ion microprobe
    country rock
    Crystallization
    magnetization
    sedimentary rock

    Cite this

    Wingate, Michael ; Pisarevsky, Sergei ; Gladkochub, D.P. ; Donskaya, T.V. ; Konstantinov, K.M. ; Mazukabzov, A.M. ; Stanevich, A.M. / Geochronology and paleomagnetism of mafic igneous rocks in the Olenek Uplift, nothern Siberia: Implications for Mesoproterozoic supercontinents and paleogeography. In: Precambrian Research. 2009 ; Vol. 170, No. 3-4. pp. 256-266.
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    abstract = "We present a new, reliably dated Mesoproterozoic paleopole for Siberia, based on a combined geochronological and paleomagnetic study of mafic rocks within the Mesoproterozoic Sololi Group of the Olenek Uplift in northern Siberia. Ion microprobe (SHRIMP) U–Pb analysis yields crystallisation ages of 2036 ± 11 Ma for zircon from a basement granite and 1473 ± 24 Ma for baddeleyite from a large dolerite sill within the Kyutingde Formation. The baddeleyite result indicates that the lower Sololi Group is significantly older than was suggested by previous K–Ar results. Paleomagnetic analysis of the dolerite sill and related mafic intrusive rocks yields a paleopole at 33.6°N, 253.1°E, A95 = 10.4°. A positive baked-contact test between the Kyutingde sill and sedimentary country rocks shows that the magnetisation is primary. Comparison of this paleopole with coeval results for Laurentia provides a revised reconstruction between Siberia and Laurentia, and implies that these two continents were parts of a single Mesoproterozoic supercontinent since at least 1473 Ma. We argue that Siberia, Laurentia, and Baltica belonged to the same supercontinent between 1473 Ma and mid-Neoproterozoic time.",
    author = "Michael Wingate and Sergei Pisarevsky and D.P. Gladkochub and T.V. Donskaya and K.M. Konstantinov and A.M. Mazukabzov and A.M. Stanevich",
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    Geochronology and paleomagnetism of mafic igneous rocks in the Olenek Uplift, nothern Siberia: Implications for Mesoproterozoic supercontinents and paleogeography. / Wingate, Michael; Pisarevsky, Sergei; Gladkochub, D.P.; Donskaya, T.V.; Konstantinov, K.M.; Mazukabzov, A.M.; Stanevich, A.M.

    In: Precambrian Research, Vol. 170, No. 3-4, 2009, p. 256-266.

    Research output: Contribution to journalArticle

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    AU - Wingate, Michael

    AU - Pisarevsky, Sergei

    AU - Gladkochub, D.P.

    AU - Donskaya, T.V.

    AU - Konstantinov, K.M.

    AU - Mazukabzov, A.M.

    AU - Stanevich, A.M.

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    N2 - We present a new, reliably dated Mesoproterozoic paleopole for Siberia, based on a combined geochronological and paleomagnetic study of mafic rocks within the Mesoproterozoic Sololi Group of the Olenek Uplift in northern Siberia. Ion microprobe (SHRIMP) U–Pb analysis yields crystallisation ages of 2036 ± 11 Ma for zircon from a basement granite and 1473 ± 24 Ma for baddeleyite from a large dolerite sill within the Kyutingde Formation. The baddeleyite result indicates that the lower Sololi Group is significantly older than was suggested by previous K–Ar results. Paleomagnetic analysis of the dolerite sill and related mafic intrusive rocks yields a paleopole at 33.6°N, 253.1°E, A95 = 10.4°. A positive baked-contact test between the Kyutingde sill and sedimentary country rocks shows that the magnetisation is primary. Comparison of this paleopole with coeval results for Laurentia provides a revised reconstruction between Siberia and Laurentia, and implies that these two continents were parts of a single Mesoproterozoic supercontinent since at least 1473 Ma. We argue that Siberia, Laurentia, and Baltica belonged to the same supercontinent between 1473 Ma and mid-Neoproterozoic time.

    AB - We present a new, reliably dated Mesoproterozoic paleopole for Siberia, based on a combined geochronological and paleomagnetic study of mafic rocks within the Mesoproterozoic Sololi Group of the Olenek Uplift in northern Siberia. Ion microprobe (SHRIMP) U–Pb analysis yields crystallisation ages of 2036 ± 11 Ma for zircon from a basement granite and 1473 ± 24 Ma for baddeleyite from a large dolerite sill within the Kyutingde Formation. The baddeleyite result indicates that the lower Sololi Group is significantly older than was suggested by previous K–Ar results. Paleomagnetic analysis of the dolerite sill and related mafic intrusive rocks yields a paleopole at 33.6°N, 253.1°E, A95 = 10.4°. A positive baked-contact test between the Kyutingde sill and sedimentary country rocks shows that the magnetisation is primary. Comparison of this paleopole with coeval results for Laurentia provides a revised reconstruction between Siberia and Laurentia, and implies that these two continents were parts of a single Mesoproterozoic supercontinent since at least 1473 Ma. We argue that Siberia, Laurentia, and Baltica belonged to the same supercontinent between 1473 Ma and mid-Neoproterozoic time.

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    DO - 10.1016/j.precamres.2009.01.004

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