Accretionary growth and crust formation in the Central Asian Orogenic Belt and comparison with the Arabian-Nubian shield

A. Kröner, B. F. Windley, G. Badarch, O. Tomurtogoo, E. Hegner, B. M. Jahn, S. Gruschka, E. V. Khain, A. Demoux, M. T D Wingate

    Research output: Contribution to journalArticle

    450 Citations (Scopus)

    Abstract

    The Central Asian Orogenic Belt is one of the largest accretionary terrains on Earth and records a ca. 800 Ma history of arc and microcontinent accretion, from south to north, during evolution and closure of the southwest Pacific-type Paleo-Asian ocean in the period ca. 1020 to ca. 325 Ma. We contest the evolutionary model for the belt proposed by previous authors in terms of a single, long island arc. Accretion of ophiolites, arcs, and Precambrian microcontinents took place in southern Siberia in late Neoproterozoic to Cambrian times. Ultrahigh-pressure subduction and metamorphism occurred in the Cambrian at Kokchetav, Kazakhstan, and high-pressure metamorphism took place in the Gorny Altai, together with arc-ward accretion of a seamount. In the Chinese Altai, Precambrian microcontinents and island arcs collided into the accreting margin. Overall the Central Asian Orogenic Belt records the formation of small forearc and backarc ocean basins that probably evolved between island arcs and microcontinents and were closed during continuous accretion between the Neoproterozoic and Paleozoic. During this time the southward-growing southern margin of the Siberian craton always faced an open ocean. Final closure of the Paleo-Asian ocean probably occurred in the late Permian when the North China craton was attached to the orogenic belt. Large volumes of felsic volcanic rocks and the presence of Precambrian zircon xenocrysts as well as ancient detrital zircons in arc-derived sediments suggest substantial reworking of old crust despite seemingly primitive Nd isotopic characteristics. Similar characteristics in arc terranes of the Arabian-Nubian shield in Saudi Arabia suggest that previously proposed anomalously high crust-formation rates in both the Central Asian Orogenic Belt and Arabian-Nubian shield require revision.

    Original languageEnglish
    Pages (from-to)181-209
    Number of pages29
    JournalMemoir of the Geological Society of America
    Volume200
    DOIs
    Publication statusPublished - 2007

    Fingerprint

    orogenic belt
    shield
    accretion
    crust
    island arc
    Precambrian
    craton
    zircon
    metamorphism
    backarc basin
    felsic rock
    ocean
    ocean basin
    seamount
    reworking
    open ocean
    terrane
    volcanic rock
    Permian
    subduction

    Cite this

    Kröner, A. ; Windley, B. F. ; Badarch, G. ; Tomurtogoo, O. ; Hegner, E. ; Jahn, B. M. ; Gruschka, S. ; Khain, E. V. ; Demoux, A. ; Wingate, M. T D. / Accretionary growth and crust formation in the Central Asian Orogenic Belt and comparison with the Arabian-Nubian shield. In: Memoir of the Geological Society of America. 2007 ; Vol. 200. pp. 181-209.
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    abstract = "The Central Asian Orogenic Belt is one of the largest accretionary terrains on Earth and records a ca. 800 Ma history of arc and microcontinent accretion, from south to north, during evolution and closure of the southwest Pacific-type Paleo-Asian ocean in the period ca. 1020 to ca. 325 Ma. We contest the evolutionary model for the belt proposed by previous authors in terms of a single, long island arc. Accretion of ophiolites, arcs, and Precambrian microcontinents took place in southern Siberia in late Neoproterozoic to Cambrian times. Ultrahigh-pressure subduction and metamorphism occurred in the Cambrian at Kokchetav, Kazakhstan, and high-pressure metamorphism took place in the Gorny Altai, together with arc-ward accretion of a seamount. In the Chinese Altai, Precambrian microcontinents and island arcs collided into the accreting margin. Overall the Central Asian Orogenic Belt records the formation of small forearc and backarc ocean basins that probably evolved between island arcs and microcontinents and were closed during continuous accretion between the Neoproterozoic and Paleozoic. During this time the southward-growing southern margin of the Siberian craton always faced an open ocean. Final closure of the Paleo-Asian ocean probably occurred in the late Permian when the North China craton was attached to the orogenic belt. Large volumes of felsic volcanic rocks and the presence of Precambrian zircon xenocrysts as well as ancient detrital zircons in arc-derived sediments suggest substantial reworking of old crust despite seemingly primitive Nd isotopic characteristics. Similar characteristics in arc terranes of the Arabian-Nubian shield in Saudi Arabia suggest that previously proposed anomalously high crust-formation rates in both the Central Asian Orogenic Belt and Arabian-Nubian shield require revision.",
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    Accretionary growth and crust formation in the Central Asian Orogenic Belt and comparison with the Arabian-Nubian shield. / Kröner, A.; Windley, B. F.; Badarch, G.; Tomurtogoo, O.; Hegner, E.; Jahn, B. M.; Gruschka, S.; Khain, E. V.; Demoux, A.; Wingate, M. T D.

    In: Memoir of the Geological Society of America, Vol. 200, 2007, p. 181-209.

    Research output: Contribution to journalArticle

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    T1 - Accretionary growth and crust formation in the Central Asian Orogenic Belt and comparison with the Arabian-Nubian shield

    AU - Kröner, A.

    AU - Windley, B. F.

    AU - Badarch, G.

    AU - Tomurtogoo, O.

    AU - Hegner, E.

    AU - Jahn, B. M.

    AU - Gruschka, S.

    AU - Khain, E. V.

    AU - Demoux, A.

    AU - Wingate, M. T D

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    AB - The Central Asian Orogenic Belt is one of the largest accretionary terrains on Earth and records a ca. 800 Ma history of arc and microcontinent accretion, from south to north, during evolution and closure of the southwest Pacific-type Paleo-Asian ocean in the period ca. 1020 to ca. 325 Ma. We contest the evolutionary model for the belt proposed by previous authors in terms of a single, long island arc. Accretion of ophiolites, arcs, and Precambrian microcontinents took place in southern Siberia in late Neoproterozoic to Cambrian times. Ultrahigh-pressure subduction and metamorphism occurred in the Cambrian at Kokchetav, Kazakhstan, and high-pressure metamorphism took place in the Gorny Altai, together with arc-ward accretion of a seamount. In the Chinese Altai, Precambrian microcontinents and island arcs collided into the accreting margin. Overall the Central Asian Orogenic Belt records the formation of small forearc and backarc ocean basins that probably evolved between island arcs and microcontinents and were closed during continuous accretion between the Neoproterozoic and Paleozoic. During this time the southward-growing southern margin of the Siberian craton always faced an open ocean. Final closure of the Paleo-Asian ocean probably occurred in the late Permian when the North China craton was attached to the orogenic belt. Large volumes of felsic volcanic rocks and the presence of Precambrian zircon xenocrysts as well as ancient detrital zircons in arc-derived sediments suggest substantial reworking of old crust despite seemingly primitive Nd isotopic characteristics. Similar characteristics in arc terranes of the Arabian-Nubian shield in Saudi Arabia suggest that previously proposed anomalously high crust-formation rates in both the Central Asian Orogenic Belt and Arabian-Nubian shield require revision.

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    KW - Arabian-Nubian shield

    KW - Central Asia

    KW - Kazakhstan

    KW - Mongolia

    KW - Zircon geochronology

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