Dynamics of the abrupt change in Pacific Plate motion around 50 million years ago

Hu, Jiashun; Gurnis, Michael; Rudi, Johann; Stadler, Georg; Müller, R. Dietmar

doi:10.1038/s41561-021-00862-6

Cited by 33 publications

(67 citation statements)

References 53 publications

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“…Our location of the ULVZ-slab interaction leading to a potential plume is consistent with the plume location in some flow models that successfully match the Hawaiian-Emperor hotspot track (Hassan et al, 2016). More recent plate reconstructions of the northern Pacific along with geodynamic models suggest that subduction from the late Miocene/early Tertiary occur at an intraplate subduction zone just north of the present location of Hawaiʻi (Hu et al, 2022), potentially a more favorable location of the seismically-inferred boundary of a plume and slab.…”

Section: Geodynamical Implicationsupporting

confidence: 82%

Strong ULVZ and Slab Interaction at the Northeastern Edge of the Pacific LLSVP Favors Plume Generation

Lai

Helmberger

Dobrosavljevic

et al. 2022

Geochem Geophys Geosyst

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The northeastern margin of the Pacific Large Low Shear Velocity Province (LLSVP) is particularly interesting as many seismic modeling studies have suggested the presence of multiple structural anomalies in this lowermost mantle region. There is a strong velocity change from the interior of the Pacific LLSVP toward the margin, inferred to be a high velocity, post-perovskite lens thins toward the edge while an ultra-low velocity zone (ULVZ) layer increases in thickness (Lay et al., 2006). To et al. ( 2011) also proposed a localized, slow ULVZ-like anomaly embedded inside or at the margin of the LLSVP from their modeling of the anomalous S and diffracted S (Sdiff) behaviors observed with a limited number of stations.The deployment of USArray, recording many deep earthquakes from Fiji-Tonga subduction zone, greatly increases the sampling points to study the lateral structural variation along this margin. Through deconvolution

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Section: Geodynamical Implicationsupporting

confidence: 82%

Strong ULVZ and Slab Interaction at the Northeastern Edge of the Pacific LLSVP Favors Plume Generation

Lai

Helmberger

Dobrosavljevic

et al. 2022

Geochem Geophys Geosyst

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“…This restricts the dynamics of subduction (e.g., by limiting lateral motion of the slabs), which impacts mantle flow, mantle forces (pressure), and topography, and contrasts with the laterally mobile slabs produced in most regional modeling studies (e.g., Christensen, 1996; Enns et al., 2005; Funiciello et al., 2004). There are notable exceptions of global models with decoupled and high resolution subduction zones, and Earth's present day plate and slab geometry (e.g., Alisic et al., 2010, 2012; Hu et al., 2022; Stadler et al., 2010), but these studies do not interrogate topography. Irrespective of coupling and resolution, sinking slabs produce a dynamic draw‐down of the surface (Gurnis et al., 1996; Mitrovica & Jarvis, 1985; Ricard et al., 1993; Rubey et al., 2017), as is reflected in RT (e.g., Faccenna & Becker, 2020; Husson, 2006) and sedimentary deposits (e.g., Gurnis, 1993; Heine et al., 2008; Mitrovica et al., 1989) on the OP.…”

Section: Introductionmentioning

confidence: 99%

The Topographic Signature of Mantle Pressure Build‐Up Beneath Subducting Plates: Insights From Spherical Subduction Models

Holt

2022

Geophysical Research Letters

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“…Coupling this knowledge with numerical models of mantle convection yields time-dependent estimates of mantle structure and dynamics. New insights are gained by examining the success or failure of models in explaining geological observables and have provided clues as to the nature of plate reorganizations 189,190 , the time dependence of large-scale mantle structures 17,19,191,192 , interactions between plumes and plates 193 , subduction dynamics at different depths 18 and mountain building processes 194 . These models can also provide predictions of the vertical motions of the surface of the Earth induced by mantle flow (termed dynamic topography 195 ) and how these motions can shape the topography of the Earth and cryosphere at a range of spatial and temporal scales [196][197][198][199][200] .…”

Section: Plate-mantle Dynamicsmentioning

confidence: 99%

Deconstructing plate tectonic reconstructions

Seton

Williams²,

Domeier³

et al. 2023

Nat Rev Earth Environ

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The evolving mosaic of tectonic plates across the surface of the Earth sets boundary conditions for the evolution of biotic and abiotic processes and helps shape the dynamics of its interior. Reconstructing plate tectonics back through time allows scientists from a range of disciplines (such as palaeobiology, palaeoclimate, geodynamics and seismology) to investigate Earth evolution through these spatiotemporal dimensions. However, the variety and complexity of plate reconstructions can lead to some of their limitations being overlooked. In this Technical Review, we discuss the domain-specific knowledge underpinning modern quantitative plate reconstructions and convey a set of principles on how to use (but not abuse) the software or results. Open-source plate tectonic reconstruction software, like GPlates, has led to a major shift in working practices, handing non-specialists the tools to develop and integrate reconstructions based on their own datasets and expertise. However, there is no 'one-size-fits-all' and users need to understand what data and underlying assumptions go into making different, sometimes competing reconstruction models. It is therefore essential to consider the many ways reconstructions simplify reality when interpreting them to avoid circular reasoning. Although many aspects of deep-time reconstructions remain unresolved, future work on intercomparisons between models and uncertainty quantification is an essential pathway towards next-generation plate reconstructions. Key points• Plate tectonic reconstructions have evolved from simple, rigid reconstructions to ones that incorporate the time-dependent evolution of plates and their boundaries, deformation and/or the history of subduction from seismic tomography.• Reconstructions can be powerfully predictive for a wide range of disciplines beyond tectonics, including palaeobiology, palaeoclimate, geodynamics and seismology.• With the advent of community-driven, open-source software and tools, plate models have become accessible and practicable to the wider geosciences community.• With this accessibility comes a responsibility for specialists and non-specialists alike to understand how these plate models are built, their weaknesses and pitfalls and how they can be used effectively to ensure correct inferences are made.• When reconstructing the tectonic plates of the Earth, there is no 'one-size-fits-all'. Different data types and techniques are more applicable for different time periods, resolutions and purposes, for example, palaeomagnetics for pre-Pangea time periods.• Important areas of ongoing research include the quantification of uncertainty, incorporation of machine learning techniques and linking reconstructions to physics-based deep Earth models and surface (and/or biogeochemical) models.

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Dynamics of the abrupt change in Pacific Plate motion around 50 million years ago

Cited by 33 publications

References 53 publications

Strong ULVZ and Slab Interaction at the Northeastern Edge of the Pacific LLSVP Favors Plume Generation

Strong ULVZ and Slab Interaction at the Northeastern Edge of the Pacific LLSVP Favors Plume Generation

The Topographic Signature of Mantle Pressure Build‐Up Beneath Subducting Plates: Insights From Spherical Subduction Models

Deconstructing plate tectonic reconstructions

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