Petrology, geochronology, and tectonic implications of c. 500 Ma metamorphic and igneous rocks along the northern margin of the Central Asian Orogen (Olkhon terrane, Lake Baikal, Siberia)

DP Gladkochub, TV Donskaya, Michael Wingate, [No Value] Mtd, U Poller, A Kroner, VS Fedorovsky, AM Mazukabzov, W Todt, SA Pisarevsky

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    Abstract

    A significant portion of the continental crust of northern Eurasia is thought to have formed during the evolution of the Central Asian Orogenic Belt at the time of accretion of continental terranes and island arcs. Records of this event are well preserved within the Siberian craton-Central Asian Orogenic Belt transition zone in Lake Baikal region, particularly in the Olkhon terrane. Our results establish granulite-facies conditions for peak metamorphism in the Olkhon terrane, and indicate that the granulites were derived from island arc mafic volcanic rocks and back-arc basin sediments. Sensitive high-resolution ion microprobe dating of metamorphic zircons from two mafic granulites yielded U-238/Pb-206 ages of 507 +/- 8 and 498 +/- 7 Ma, and magmatic zircons from syntectonic syenite yielded an age of 495 +/- 6 Ma. The main metamorphic event occurred at about 500 Ma, and was probably related to collision of the Barguzin microcontinent with the Siberian craton. Ages from 535 to 2750 Ma for detrital zircon cores in early Palaeozoic metasediments of the Olhkon terrane were obtained. Archaean ages of detrital zircons in such metasediments suggest that the Barguzin microcontinent was originally part of the Aldan Province of the Siberian craton that was detached in late Mesoproterozoic, and reattached to the craton during early Palaeozoic collision.
    Original languageEnglish
    Pages (from-to)235-246
    JournalJournal of the Geological Society
    Volume165
    DOIs
    Publication statusPublished - 2008

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    petrology
    geochronology
    igneous rock
    metamorphic rock
    craton
    terrane
    zircon
    tectonics
    lake
    metasediment
    orogenic belt
    island arc
    Paleozoic
    collision
    syenite
    ion microprobe
    granulite facies
    mafic rock
    transition zone
    continental crust

    Cite this

    Gladkochub, DP ; Donskaya, TV ; Wingate, Michael ; Mtd, [No Value] ; Poller, U ; Kroner, A ; Fedorovsky, VS ; Mazukabzov, AM ; Todt, W ; Pisarevsky, SA. / Petrology, geochronology, and tectonic implications of c. 500 Ma metamorphic and igneous rocks along the northern margin of the Central Asian Orogen (Olkhon terrane, Lake Baikal, Siberia). In: Journal of the Geological Society. 2008 ; Vol. 165. pp. 235-246.
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    abstract = "A significant portion of the continental crust of northern Eurasia is thought to have formed during the evolution of the Central Asian Orogenic Belt at the time of accretion of continental terranes and island arcs. Records of this event are well preserved within the Siberian craton-Central Asian Orogenic Belt transition zone in Lake Baikal region, particularly in the Olkhon terrane. Our results establish granulite-facies conditions for peak metamorphism in the Olkhon terrane, and indicate that the granulites were derived from island arc mafic volcanic rocks and back-arc basin sediments. Sensitive high-resolution ion microprobe dating of metamorphic zircons from two mafic granulites yielded U-238/Pb-206 ages of 507 +/- 8 and 498 +/- 7 Ma, and magmatic zircons from syntectonic syenite yielded an age of 495 +/- 6 Ma. The main metamorphic event occurred at about 500 Ma, and was probably related to collision of the Barguzin microcontinent with the Siberian craton. Ages from 535 to 2750 Ma for detrital zircon cores in early Palaeozoic metasediments of the Olhkon terrane were obtained. Archaean ages of detrital zircons in such metasediments suggest that the Barguzin microcontinent was originally part of the Aldan Province of the Siberian craton that was detached in late Mesoproterozoic, and reattached to the craton during early Palaeozoic collision.",
    author = "DP Gladkochub and TV Donskaya and Michael Wingate and Mtd, {[No Value]} and U Poller and A Kroner and VS Fedorovsky and AM Mazukabzov and W Todt and SA Pisarevsky",
    year = "2008",
    doi = "10.1144/0016-76492006-125",
    language = "English",
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    pages = "235--246",
    journal = "Journal of the Geological Society, London",
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    Petrology, geochronology, and tectonic implications of c. 500 Ma metamorphic and igneous rocks along the northern margin of the Central Asian Orogen (Olkhon terrane, Lake Baikal, Siberia). / Gladkochub, DP; Donskaya, TV; Wingate, Michael; Mtd, [No Value]; Poller, U; Kroner, A; Fedorovsky, VS; Mazukabzov, AM; Todt, W; Pisarevsky, SA.

    In: Journal of the Geological Society, Vol. 165, 2008, p. 235-246.

    Research output: Contribution to journalArticle

    TY - JOUR

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    AU - Gladkochub, DP

    AU - Donskaya, TV

    AU - Wingate, Michael

    AU - Mtd, [No Value]

    AU - Poller, U

    AU - Kroner, A

    AU - Fedorovsky, VS

    AU - Mazukabzov, AM

    AU - Todt, W

    AU - Pisarevsky, SA

    PY - 2008

    Y1 - 2008

    N2 - A significant portion of the continental crust of northern Eurasia is thought to have formed during the evolution of the Central Asian Orogenic Belt at the time of accretion of continental terranes and island arcs. Records of this event are well preserved within the Siberian craton-Central Asian Orogenic Belt transition zone in Lake Baikal region, particularly in the Olkhon terrane. Our results establish granulite-facies conditions for peak metamorphism in the Olkhon terrane, and indicate that the granulites were derived from island arc mafic volcanic rocks and back-arc basin sediments. Sensitive high-resolution ion microprobe dating of metamorphic zircons from two mafic granulites yielded U-238/Pb-206 ages of 507 +/- 8 and 498 +/- 7 Ma, and magmatic zircons from syntectonic syenite yielded an age of 495 +/- 6 Ma. The main metamorphic event occurred at about 500 Ma, and was probably related to collision of the Barguzin microcontinent with the Siberian craton. Ages from 535 to 2750 Ma for detrital zircon cores in early Palaeozoic metasediments of the Olhkon terrane were obtained. Archaean ages of detrital zircons in such metasediments suggest that the Barguzin microcontinent was originally part of the Aldan Province of the Siberian craton that was detached in late Mesoproterozoic, and reattached to the craton during early Palaeozoic collision.

    AB - A significant portion of the continental crust of northern Eurasia is thought to have formed during the evolution of the Central Asian Orogenic Belt at the time of accretion of continental terranes and island arcs. Records of this event are well preserved within the Siberian craton-Central Asian Orogenic Belt transition zone in Lake Baikal region, particularly in the Olkhon terrane. Our results establish granulite-facies conditions for peak metamorphism in the Olkhon terrane, and indicate that the granulites were derived from island arc mafic volcanic rocks and back-arc basin sediments. Sensitive high-resolution ion microprobe dating of metamorphic zircons from two mafic granulites yielded U-238/Pb-206 ages of 507 +/- 8 and 498 +/- 7 Ma, and magmatic zircons from syntectonic syenite yielded an age of 495 +/- 6 Ma. The main metamorphic event occurred at about 500 Ma, and was probably related to collision of the Barguzin microcontinent with the Siberian craton. Ages from 535 to 2750 Ma for detrital zircon cores in early Palaeozoic metasediments of the Olhkon terrane were obtained. Archaean ages of detrital zircons in such metasediments suggest that the Barguzin microcontinent was originally part of the Aldan Province of the Siberian craton that was detached in late Mesoproterozoic, and reattached to the craton during early Palaeozoic collision.

    U2 - 10.1144/0016-76492006-125

    DO - 10.1144/0016-76492006-125

    M3 - Article

    VL - 165

    SP - 235

    EP - 246

    JO - Journal of the Geological Society, London

    JF - Journal of the Geological Society, London

    SN - 0016-7649

    ER -