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  1. Article ; Online: Pacific plate motion change caused the Hawaiian-Emperor Bend.

    Torsvik, Trond H / Doubrovine, Pavel V / Steinberger, Bernhard / Gaina, Carmen / Spakman, Wim / Domeier, Mathew

    Nature communications

    2017  Volume 8, Page(s) 15660

    Abstract: ... variously been interpreted as the result of an abrupt Pacific plate motion change in the Eocene (∼47 Ma ... without invoking a prominent change in the direction of Pacific plate motion around 47 Ma. ... A conspicuous 60° bend of the Hawaiian-Emperor Chain in the north-western Pacific Ocean has ...

    Abstract A conspicuous 60° bend of the Hawaiian-Emperor Chain in the north-western Pacific Ocean has variously been interpreted as the result of an abrupt Pacific plate motion change in the Eocene (∼47 Ma), a rapid southward drift of the Hawaiian hotspot before the formation of the bend, or a combination of these two causes. Palaeomagnetic data from the Emperor Seamounts prove ambiguous for constraining the Hawaiian hotspot drift, but mantle flow modelling suggests that the hotspot drifted 4-9° south between 80 and 47 Ma. Here we demonstrate that southward hotspot drift cannot be a sole or dominant mechanism for formation of the Hawaiian-Emperor Bend (HEB). While southward hotspot drift has resulted in more northerly positions of the Emperor Seamounts as they are observed today, formation of the HEB cannot be explained without invoking a prominent change in the direction of Pacific plate motion around 47 Ma.
    Language English
    Publishing date 2017-06-05
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/ncomms15660
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Pacific plate motion change caused the Hawaiian-Emperor Bend

    Trond Torsvik / Pavel V. Doubrovine / B. Steinberger / Carmen Gaina / Wim Spakman / Mathew Domeier

    Nature Communications

    2017  

    Publishing country de
    Document type Article ; Online
    DOI 10.1038/ncomms15660
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Pacific plate motion change caused the Hawaiian-Emperor Bend

    Torsvik, T. / Doubrovine, P. / Steinberger, B. / Gaina, C. / Spakman, W. / Domeier, M.

    Nature Communications

    2017  

    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Pacific plate motion change caused the Hawaiian-Emperor Bend

    Trond H. Torsvik / Pavel V. Doubrovine / Bernhard Steinberger / Carmen Gaina / Wim Spakman / Mathew Domeier

    Nature Communications, Vol 8, Iss 1, Pp 1-

    2017  Volume 12

    Abstract: The Hawaiian-Emperor Chain has a 60° bend that has been interpreted as the result of Pacific plate ... the dominant mechanism for bend formation, but involves a change in the direction of Pacific plate motion ... motion at 47 Ma or drift of the Hawaiian hotspot. Here, the authors show that hotspot drift cannot be ...

    Abstract The Hawaiian-Emperor Chain has a 60° bend that has been interpreted as the result of Pacific plate motion at 47 Ma or drift of the Hawaiian hotspot. Here, the authors show that hotspot drift cannot be the dominant mechanism for bend formation, but involves a change in the direction of Pacific plate motion at ∼47 Ma.
    Keywords Science ; Q
    Language English
    Publishing date 2017-06-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Deformation-related volcanism in the Pacific Ocean linked to the Hawaiian–Emperor bend

    O’Connor, John M. / Hoernle, Kaj / Müller, R. Dietmar / Morgan, Jason P. / Butterworth, Nathaniel P. / Hauff, Folkmar / Sandwell, David T. / Jokat, Wilfried / Wijbrans, Jan R. / Stoffers, Peter

    2015  

    Abstract: ... in the Hawaiian–Emperor volcanic chain has been linked to changes in the direction of motion of the Pacific Plate ... We conclude that the Hawaiian–Emperor bend was formed by plate–mantle reorganization, potentially triggered ... of volcanic seamounts formed close to the Hawaiian–Emperor bend. We find that the geochemical signature ...

    Abstract Ocean islands, seamounts and volcanic ridges are thought to form above mantle plumes. Yet, this mechanism cannot explain many volcanic features on the Pacific Ocean floor and some might instead be caused by cracks in the oceanic crust linked to the reorganization of plate motions. A distinctive bend in the Hawaiian–Emperor volcanic chain has been linked to changes in the direction of motion of the Pacific Plate, movement of the Hawaiian plume, or a combination of both. However, these links are uncertain because there is no independent record that precisely dates tectonic events that affected the Pacific Plate. Here we analyse the geochemical characteristics of lava samples collected from the Musicians Ridges, lines of volcanic seamounts formed close to the Hawaiian–Emperor bend. We find that the geochemical signature of these lavas is unlike typical ocean island basalts and instead resembles mid-ocean ridge basalts. We infer that the seamounts are unrelated to mantle plume activity and instead formed in an extensional setting, due to deformation of the Pacific Plate. 40Ar/39Ar dating reveals that the Musicians Ridges formed during two time windows that bracket the time of formation of the Hawaiian–Emperor bend, 53–52 and 48–47 million years ago. We conclude that the Hawaiian–Emperor bend was formed by plate–mantle reorganization, potentially triggered by a series of subduction events at the Pacific Plate margins.
    Subject code 551
    Language English
    Publishing date 2015-04-27
    Publisher Nature Publishing Group
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Pacific plate slab pull and intraplate deformation in the early Cenozoic

    N. P. Butterworth / R. D. Müller / L. Quevedo / J. M. O'Connor / K. Hoernle / G. Morra

    Solid Earth, Vol 5, Iss 2, Pp 757-

    2014  Volume 777

    Abstract: ... absolute plate motion directions, and cannot be responsible for the Hawaiian–Emperor bend (HEB), confirming ... that early Cenozoic changes in Pacific plate driving forces only cause relatively minor changes in Pacific ... to investigate the contribution of subducting slabs through time on Pacific plate motion and plate-scale ...

    Abstract Large tectonic plates are known to be susceptible to internal deformation, leading to a~range of phenomena including intraplate volcanism. However, the space and time dependence of intraplate deformation and its relationship with changing plate boundary configurations, subducting slab geometries, and absolute plate motion is poorly understood. We utilise a buoyancy-driven Stokes flow solver, BEM-Earth, to investigate the contribution of subducting slabs through time on Pacific plate motion and plate-scale deformation, and how this is linked to intraplate volcanism. We produce a series of geodynamic models from 62 to 42 Ma in which the plates are driven by the attached subducting slabs and mantle drag/suction forces. We compare our modelled intraplate deformation history with those types of intraplate volcanism that lack a clear age progression. Our models suggest that changes in Cenozoic subduction zone topology caused intraplate deformation to trigger volcanism along several linear seafloor structures, mostly by reactivation of existing seamount chains, but occasionally creating new volcanic chains on crust weakened by fracture zones and extinct ridges. Around 55 Ma, subduction of the Pacific-Izanagi ridge reconfigured the major tectonic forces acting on the plate by replacing ridge push with slab pull along its northwestern perimeter, causing lithospheric extension along pre-existing weaknesses. Large-scale deformation observed in the models coincides with the seamount chains of Hawaii, Louisville, Tokelau and Gilbert during our modelled time period of 62 to 42 Ma. We suggest that extensional stresses between 72 and 52 Ma are the likely cause of large parts of the formation of the Gilbert chain and that localised extension between 62 and 42 Ma could cause late-stage volcanism along the Musicians volcanic ridges. Our models demonstrate that early Cenozoic changes in Pacific plate driving forces only cause relatively minor changes in Pacific absolute plate motion directions, and cannot be responsible for the Hawaiian–Emperor bend (HEB), confirming previous interpretations that the 47 Ma HEB does not primarily reflect an absolute plate motion event.
    Keywords Science ; Q ; Geology ; QE1-996.5 ; Stratigraphy ; QE640-699 ; Petrology ; QE420-499 ; Dynamic and structural geology ; QE500-639.5
    Subject code 550
    Language English
    Publishing date 2014-08-01T00:00:00Z
    Publisher Copernicus Publications
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Pacific Plate slab pull and intraplate deformation in the early Cenozoic

    N. P. Butterworth / R. D. Müller / L. Quevedo / J. M.O'Connor / K. Hoernle / G. Morra

    Solid Earth Discussions, Vol 6, Iss 1, Pp 145-

    2014  Volume 190

    Abstract: ... absolute plate motions, and cannot be responsible for the Hawaii-Emperor Bend (HEB), confirming previous ... that early Cenozoic changes in Pacific plate driving forces only cause relatively minor changes in Pacific ... to investigate the contribution of subducting slabs through time on Pacific Plate motion and plate-scale ...

    Abstract Large tectonic plates are known to be susceptible to internal deformation, leading to a range of phenomena including intraplate volcanism. However, the space and time dependence of intraplate deformation and its relationship with changing plate boundary configurations, subducting slab geometries, and absolute plate motion is poorly understood. We utilise a buoyancy driven Stokes flow solver, BEM-Earth, to investigate the contribution of subducting slabs through time on Pacific Plate motion and plate-scale deformation, and how this is linked to intraplate volcanism. We produce a series of geodynamic models from 62 to 42 Ma in which the plates are driven by the attached subducting slabs and mantle drag/suction forces. We compare our modelled intraplate deformation history with those types of intraplate volcanism that lack a clear age progression. Our models suggest that changes in Cenozoic subduction zone topology caused intraplate deformation to trigger volcanism along several linear seafloor structures, mostly by reactivation of existing seamount chains, but occasionally creating new volcanic chains on crust weakened by fracture zones and extinct ridges. Around 55 Ma subduction of the Pacific-Izanagi ridge reconfigured the major tectonic forces acting on the plate by replacing ridge push with slab pull along its north-western perimeter, causing lithospheric extension along pre-existing weaknesses. Large scale deformation observed in the models coincides with the seamount chains of Hawaii, Louisville, Tokelau, and Gilbert during our modelled time period of 62 to 42 Ma. We suggest that extensional stresses between 72 and 52 Ma are the likely cause of large parts of the formation of the Gilbert chain and that localised extension between 62 and 42 Ma could cause late-stage volcanism along the Musicians Volcanic Ridges. Our models demonstrate that early Cenozoic changes in Pacific plate driving forces only cause relatively minor changes in Pacific absolute plate motions, and cannot be responsible for the Hawaii-Emperor Bend (HEB), confirming previous interpretations that the 47 Ma HEB does not reflect an absolute plate motion event.
    Keywords Geology ; QE1-996.5 ; Science ; Q ; Mineralogy ; QE351-399.2 ; Stratigraphy ; QE640-699 ; Petrology ; QE420-499 ; Dynamic and structural geology ; QE500-639.5
    Subject code 550
    Language English
    Publishing date 2014-01-01T00:00:00Z
    Publisher Copernicus Publications
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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