Mafic intrusions in southwestern Siberia and implications for a Neoproterozoic connection with Laurentia

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

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    Abstract

    Geochemical and geochronological studies reveal three distinct groups of Neoproterozoic to Early Paleozoic mafic intrusions in the Biryusa metamorphic massif of southwestern Siberia. Group I includes mafic sills that intruded Neoproterozoic passive-margin sediments, and were sourced from mantle-derived melts contaminated by crustal components. One sill yielded a plagioclase Ar-40-Ar-39 age of 741 +/- 4 Ma, similar to ages of sills in the adjacent Sharyzhalgai metamorphic massif (all ages are +/- 2 sigma or 95%). Group 2 is represented by north-trending dolerite dykes, one of which furnished a Ar-40-Ar-39 age of 612 +/- 6 Ma. Group 2 dykes may have formed by passive asthenospheric upwelling and decompression during lithospheric stretching within the Neoproterozoic passive margin, a suggestion supported by the occurrence of coeval carbonatites and alkaline ultramafic rocks in the adjacent Sharyzhalgai massif. Group 3 consists of NW-trending dolerite dykes produced by melting of a lithospheric mantle source metasomatised by subduction-related fluids. Zircons from one Group 3 dyke provided a SHRIMP U-Pb zircon age of 511 +/- 5 Ma, similar to the age of regional metamorphism during Early Paleozoic orogenesis. Our results show that mafic intrusions, broadly similar in age to the Franklin intrusions of northern Laurentia, exist along the southwestern margin of Siberia. Paleomagnetic data permit a reconstruction in which southern Siberia is located opposite northern Canada, but at a sufficient distance to accommodate other crustal blocks (e.g. northern Alaska, Chukchi Peninsula), and in which Group 1 intrusions could be distal products of the mid-Neoproterozoic Franklin mantle plume that affected northern Laurentia. (c) 2006 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)260-278
    JournalPrecambrian Research
    Volume147
    Issue number3-4
    DOIs
    Publication statusPublished - 2006

    Fingerprint

    Laurentia
    Stretching
    Sediments
    sill
    Melting
    Rocks
    passive margin
    Fluids
    diabase
    zircon
    Paleozoic
    alkaline rock
    regional metamorphism
    mantle plume
    ultramafic rock
    decompression
    mantle source
    orogeny
    dike
    plagioclase

    Cite this

    Gladkochub, D. P., Wingate, M., Pisarevsky, S., Donskaya, T. V., Mazukabzov, A. M., Ponomarchuk, V. A., & Stanevich, A. M. (2006). Mafic intrusions in southwestern Siberia and implications for a Neoproterozoic connection with Laurentia. Precambrian Research, 147(3-4), 260-278. https://doi.org/10.1016/j.precamres.2006.01.018
    Gladkochub, D.P. ; Wingate, Michael ; Pisarevsky, Sergei ; Donskaya, T.V. ; Mazukabzov, A.M. ; Ponomarchuk, V.A. ; Stanevich, A.M. / Mafic intrusions in southwestern Siberia and implications for a Neoproterozoic connection with Laurentia. In: Precambrian Research. 2006 ; Vol. 147, No. 3-4. pp. 260-278.
    @article{4cabb6d1168941829cf5a16c01e67f1b,
    title = "Mafic intrusions in southwestern Siberia and implications for a Neoproterozoic connection with Laurentia",
    abstract = "Geochemical and geochronological studies reveal three distinct groups of Neoproterozoic to Early Paleozoic mafic intrusions in the Biryusa metamorphic massif of southwestern Siberia. Group I includes mafic sills that intruded Neoproterozoic passive-margin sediments, and were sourced from mantle-derived melts contaminated by crustal components. One sill yielded a plagioclase Ar-40-Ar-39 age of 741 +/- 4 Ma, similar to ages of sills in the adjacent Sharyzhalgai metamorphic massif (all ages are +/- 2 sigma or 95{\%}). Group 2 is represented by north-trending dolerite dykes, one of which furnished a Ar-40-Ar-39 age of 612 +/- 6 Ma. Group 2 dykes may have formed by passive asthenospheric upwelling and decompression during lithospheric stretching within the Neoproterozoic passive margin, a suggestion supported by the occurrence of coeval carbonatites and alkaline ultramafic rocks in the adjacent Sharyzhalgai massif. Group 3 consists of NW-trending dolerite dykes produced by melting of a lithospheric mantle source metasomatised by subduction-related fluids. Zircons from one Group 3 dyke provided a SHRIMP U-Pb zircon age of 511 +/- 5 Ma, similar to the age of regional metamorphism during Early Paleozoic orogenesis. Our results show that mafic intrusions, broadly similar in age to the Franklin intrusions of northern Laurentia, exist along the southwestern margin of Siberia. Paleomagnetic data permit a reconstruction in which southern Siberia is located opposite northern Canada, but at a sufficient distance to accommodate other crustal blocks (e.g. northern Alaska, Chukchi Peninsula), and in which Group 1 intrusions could be distal products of the mid-Neoproterozoic Franklin mantle plume that affected northern Laurentia. (c) 2006 Elsevier B.V. All rights reserved.",
    author = "D.P. Gladkochub and Michael Wingate and Sergei Pisarevsky and T.V. Donskaya and A.M. Mazukabzov and V.A. Ponomarchuk and A.M. Stanevich",
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    Gladkochub, DP, Wingate, M, Pisarevsky, S, Donskaya, TV, Mazukabzov, AM, Ponomarchuk, VA & Stanevich, AM 2006, 'Mafic intrusions in southwestern Siberia and implications for a Neoproterozoic connection with Laurentia' Precambrian Research, vol. 147, no. 3-4, pp. 260-278. https://doi.org/10.1016/j.precamres.2006.01.018

    Mafic intrusions in southwestern Siberia and implications for a Neoproterozoic connection with Laurentia. / Gladkochub, D.P.; Wingate, Michael; Pisarevsky, Sergei; Donskaya, T.V.; Mazukabzov, A.M.; Ponomarchuk, V.A.; Stanevich, A.M.

    In: Precambrian Research, Vol. 147, No. 3-4, 2006, p. 260-278.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Mafic intrusions in southwestern Siberia and implications for a Neoproterozoic connection with Laurentia

    AU - Gladkochub, D.P.

    AU - Wingate, Michael

    AU - Pisarevsky, Sergei

    AU - Donskaya, T.V.

    AU - Mazukabzov, A.M.

    AU - Ponomarchuk, V.A.

    AU - Stanevich, A.M.

    PY - 2006

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    N2 - Geochemical and geochronological studies reveal three distinct groups of Neoproterozoic to Early Paleozoic mafic intrusions in the Biryusa metamorphic massif of southwestern Siberia. Group I includes mafic sills that intruded Neoproterozoic passive-margin sediments, and were sourced from mantle-derived melts contaminated by crustal components. One sill yielded a plagioclase Ar-40-Ar-39 age of 741 +/- 4 Ma, similar to ages of sills in the adjacent Sharyzhalgai metamorphic massif (all ages are +/- 2 sigma or 95%). Group 2 is represented by north-trending dolerite dykes, one of which furnished a Ar-40-Ar-39 age of 612 +/- 6 Ma. Group 2 dykes may have formed by passive asthenospheric upwelling and decompression during lithospheric stretching within the Neoproterozoic passive margin, a suggestion supported by the occurrence of coeval carbonatites and alkaline ultramafic rocks in the adjacent Sharyzhalgai massif. Group 3 consists of NW-trending dolerite dykes produced by melting of a lithospheric mantle source metasomatised by subduction-related fluids. Zircons from one Group 3 dyke provided a SHRIMP U-Pb zircon age of 511 +/- 5 Ma, similar to the age of regional metamorphism during Early Paleozoic orogenesis. Our results show that mafic intrusions, broadly similar in age to the Franklin intrusions of northern Laurentia, exist along the southwestern margin of Siberia. Paleomagnetic data permit a reconstruction in which southern Siberia is located opposite northern Canada, but at a sufficient distance to accommodate other crustal blocks (e.g. northern Alaska, Chukchi Peninsula), and in which Group 1 intrusions could be distal products of the mid-Neoproterozoic Franklin mantle plume that affected northern Laurentia. (c) 2006 Elsevier B.V. All rights reserved.

    AB - Geochemical and geochronological studies reveal three distinct groups of Neoproterozoic to Early Paleozoic mafic intrusions in the Biryusa metamorphic massif of southwestern Siberia. Group I includes mafic sills that intruded Neoproterozoic passive-margin sediments, and were sourced from mantle-derived melts contaminated by crustal components. One sill yielded a plagioclase Ar-40-Ar-39 age of 741 +/- 4 Ma, similar to ages of sills in the adjacent Sharyzhalgai metamorphic massif (all ages are +/- 2 sigma or 95%). Group 2 is represented by north-trending dolerite dykes, one of which furnished a Ar-40-Ar-39 age of 612 +/- 6 Ma. Group 2 dykes may have formed by passive asthenospheric upwelling and decompression during lithospheric stretching within the Neoproterozoic passive margin, a suggestion supported by the occurrence of coeval carbonatites and alkaline ultramafic rocks in the adjacent Sharyzhalgai massif. Group 3 consists of NW-trending dolerite dykes produced by melting of a lithospheric mantle source metasomatised by subduction-related fluids. Zircons from one Group 3 dyke provided a SHRIMP U-Pb zircon age of 511 +/- 5 Ma, similar to the age of regional metamorphism during Early Paleozoic orogenesis. Our results show that mafic intrusions, broadly similar in age to the Franklin intrusions of northern Laurentia, exist along the southwestern margin of Siberia. Paleomagnetic data permit a reconstruction in which southern Siberia is located opposite northern Canada, but at a sufficient distance to accommodate other crustal blocks (e.g. northern Alaska, Chukchi Peninsula), and in which Group 1 intrusions could be distal products of the mid-Neoproterozoic Franklin mantle plume that affected northern Laurentia. (c) 2006 Elsevier B.V. All rights reserved.

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    DO - 10.1016/j.precamres.2006.01.018

    M3 - Article

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