Proterozoic accretionary tectonics in the east Kimberley region, Australia

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    Abstract

    © 2016 Elsevier B.V.. The east Kimberley region contains well-preserved tectonic structure dating back to the Earth's most significant stage of continental growth: the assembly of the Nuna supercontinent. An integrated geological-geophysical investigation of this region has been conducted and reveals insight into its tectonic evolution, including potential influence of significant crustal-scale structures in the development of regional architecture, the emplacement of magma, and the relationship of these structures to large-scale deformation. Some newly interpreted features include a north-trending structure, and three north-west trending structures that segment the north-east trending orogen. The central segment of the orogen is a zone of higher metamorphic grade, and is host to a distinct gravity high. This gravity high can be explained by excess mass in the mid-crust. This anomaly is consistent with either a large mafic-ultramafic intrusion or a high-density crustal fragment. Possible tectonic models to explain the geophysical and metamorphic anomalies involve, in the latter case, the accretion of a crustal fragment to the Kimberley Craton prior to the 1865-1850 Ma Hooper Orogeny or, in the former case, intrusion of voluminous mafic magmas into the middle crust. Whether by igneous or structural means, we consider the development of this anomalous region to be a result of along-strike variations in subduction dynamics. These were perhaps driven by variations in slab-geometry accommodated by the orogen-normal structures we identify. The orogen-normal structures are interpreted to be crustal-scale faults, along which significant vertical displacement occurred when a crustal fragment collided with Kimberley Craton and exhumed high-grade metamorphic rocks to the surface.
    Original languageEnglish
    Pages (from-to)265-282
    Number of pages18
    JournalPrecambrian Research
    Volume278
    DOIs
    Publication statusPublished - 2016

    Fingerprint

    Tectonics
    Proterozoic
    tectonics
    craton
    Gravitation
    Geochronology
    Metamorphic rocks
    gravity
    crust
    anomaly
    tectonic structure
    supercontinent
    tectonic evolution
    orogeny
    metamorphic rock
    slab
    emplacement
    subduction
    Earth (planet)
    magma

    Cite this

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    title = "Proterozoic accretionary tectonics in the east Kimberley region, Australia",
    abstract = "{\circledC} 2016 Elsevier B.V.. The east Kimberley region contains well-preserved tectonic structure dating back to the Earth's most significant stage of continental growth: the assembly of the Nuna supercontinent. An integrated geological-geophysical investigation of this region has been conducted and reveals insight into its tectonic evolution, including potential influence of significant crustal-scale structures in the development of regional architecture, the emplacement of magma, and the relationship of these structures to large-scale deformation. Some newly interpreted features include a north-trending structure, and three north-west trending structures that segment the north-east trending orogen. The central segment of the orogen is a zone of higher metamorphic grade, and is host to a distinct gravity high. This gravity high can be explained by excess mass in the mid-crust. This anomaly is consistent with either a large mafic-ultramafic intrusion or a high-density crustal fragment. Possible tectonic models to explain the geophysical and metamorphic anomalies involve, in the latter case, the accretion of a crustal fragment to the Kimberley Craton prior to the 1865-1850 Ma Hooper Orogeny or, in the former case, intrusion of voluminous mafic magmas into the middle crust. Whether by igneous or structural means, we consider the development of this anomalous region to be a result of along-strike variations in subduction dynamics. These were perhaps driven by variations in slab-geometry accommodated by the orogen-normal structures we identify. The orogen-normal structures are interpreted to be crustal-scale faults, along which significant vertical displacement occurred when a crustal fragment collided with Kimberley Craton and exhumed high-grade metamorphic rocks to the surface.",
    author = "Lindsay, {Mark D.} and Sandra Occhipinti and Aitken, {Alan R.A.} and Vaclav Metelka and J. Hollis and I. Tyler",
    year = "2016",
    doi = "10.1016/j.precamres.2016.03.019",
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    Proterozoic accretionary tectonics in the east Kimberley region, Australia. / Lindsay, Mark D.; Occhipinti, Sandra; Aitken, Alan R.A.; Metelka, Vaclav; Hollis, J.; Tyler, I.

    In: Precambrian Research, Vol. 278, 2016, p. 265-282.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Proterozoic accretionary tectonics in the east Kimberley region, Australia

    AU - Lindsay, Mark D.

    AU - Occhipinti, Sandra

    AU - Aitken, Alan R.A.

    AU - Metelka, Vaclav

    AU - Hollis, J.

    AU - Tyler, I.

    PY - 2016

    Y1 - 2016

    N2 - © 2016 Elsevier B.V.. The east Kimberley region contains well-preserved tectonic structure dating back to the Earth's most significant stage of continental growth: the assembly of the Nuna supercontinent. An integrated geological-geophysical investigation of this region has been conducted and reveals insight into its tectonic evolution, including potential influence of significant crustal-scale structures in the development of regional architecture, the emplacement of magma, and the relationship of these structures to large-scale deformation. Some newly interpreted features include a north-trending structure, and three north-west trending structures that segment the north-east trending orogen. The central segment of the orogen is a zone of higher metamorphic grade, and is host to a distinct gravity high. This gravity high can be explained by excess mass in the mid-crust. This anomaly is consistent with either a large mafic-ultramafic intrusion or a high-density crustal fragment. Possible tectonic models to explain the geophysical and metamorphic anomalies involve, in the latter case, the accretion of a crustal fragment to the Kimberley Craton prior to the 1865-1850 Ma Hooper Orogeny or, in the former case, intrusion of voluminous mafic magmas into the middle crust. Whether by igneous or structural means, we consider the development of this anomalous region to be a result of along-strike variations in subduction dynamics. These were perhaps driven by variations in slab-geometry accommodated by the orogen-normal structures we identify. The orogen-normal structures are interpreted to be crustal-scale faults, along which significant vertical displacement occurred when a crustal fragment collided with Kimberley Craton and exhumed high-grade metamorphic rocks to the surface.

    AB - © 2016 Elsevier B.V.. The east Kimberley region contains well-preserved tectonic structure dating back to the Earth's most significant stage of continental growth: the assembly of the Nuna supercontinent. An integrated geological-geophysical investigation of this region has been conducted and reveals insight into its tectonic evolution, including potential influence of significant crustal-scale structures in the development of regional architecture, the emplacement of magma, and the relationship of these structures to large-scale deformation. Some newly interpreted features include a north-trending structure, and three north-west trending structures that segment the north-east trending orogen. The central segment of the orogen is a zone of higher metamorphic grade, and is host to a distinct gravity high. This gravity high can be explained by excess mass in the mid-crust. This anomaly is consistent with either a large mafic-ultramafic intrusion or a high-density crustal fragment. Possible tectonic models to explain the geophysical and metamorphic anomalies involve, in the latter case, the accretion of a crustal fragment to the Kimberley Craton prior to the 1865-1850 Ma Hooper Orogeny or, in the former case, intrusion of voluminous mafic magmas into the middle crust. Whether by igneous or structural means, we consider the development of this anomalous region to be a result of along-strike variations in subduction dynamics. These were perhaps driven by variations in slab-geometry accommodated by the orogen-normal structures we identify. The orogen-normal structures are interpreted to be crustal-scale faults, along which significant vertical displacement occurred when a crustal fragment collided with Kimberley Craton and exhumed high-grade metamorphic rocks to the surface.

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    DO - 10.1016/j.precamres.2016.03.019

    M3 - Article

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    JO - Precambrian Research

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    SN - 0301-9268

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