Cenozoic upper mantle flow history of the Atlantic realm based on Couette/Poiseuille models: Towards paleo-mantle-flowgraphy
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Cenozoic upper mantle flow history of the Atlantic realm based on Couette/Poiseuille models : Towards paleo-mantle-flowgraphy. / Wang, Zhirui Ray; Stotz, Ingo L.; Bunge, Hans-Peter; Vilacís, Berta; Hayek, Jorge N.; Ghelichkhan, Sia; Lebedev, Sergei.
I: Physics of the Earth and Planetary Interiors, Bind 340, 107045, 2023.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Cenozoic upper mantle flow history of the Atlantic realm based on Couette/Poiseuille models
T2 - Towards paleo-mantle-flowgraphy
AU - Wang, Zhirui Ray
AU - Stotz, Ingo L.
AU - Bunge, Hans-Peter
AU - Vilacís, Berta
AU - Hayek, Jorge N.
AU - Ghelichkhan, Sia
AU - Lebedev, Sergei
N1 - Publisher Copyright: © 2023 The Authors
PY - 2023
Y1 - 2023
N2 - Mantle convection is a fundamental process in the Earth's system, yet its history remains poorly known. Sophisticated inverse geodynamic Earth models are available to retrodict past mantle states, but their high computational cost and complex parameterizations limit their ability to isolate key effects and interpret simulated paleo-mantle-flow patterns. This calls for an approach to conceptualize paleo-mantle-flow at a simple analytical level. The existence of weak asthenosphere allows one to formulate a Couette/Poiseuille model of upper mantle flow, where flow is linked to movements of overlying tectonic plates, and to lateral pressure gradients induced by rising plumes and sinking slabs. Here we present results from such models for the Atlantic realm in the Cenozoic, and link them to seismically inferred anisotropy along with mantle flow retrodictions from inverse geodynamic modeling. Our analytical paleo-mantle-flow indicates that (1) material sourced by plumes is carried towards slab locations, as expected, (2) it is broadly consistent with the orientation of seismic azimuthal anisotropy, and (3) it agrees with the large-scale flow patterns and amplitudes from mantle flow retrodictions. Our results suggest using a hierarchy of models together with growing geological constraints on past plate motions and dynamic topography to gain a better understanding of paleo-mantle-flow.
AB - Mantle convection is a fundamental process in the Earth's system, yet its history remains poorly known. Sophisticated inverse geodynamic Earth models are available to retrodict past mantle states, but their high computational cost and complex parameterizations limit their ability to isolate key effects and interpret simulated paleo-mantle-flow patterns. This calls for an approach to conceptualize paleo-mantle-flow at a simple analytical level. The existence of weak asthenosphere allows one to formulate a Couette/Poiseuille model of upper mantle flow, where flow is linked to movements of overlying tectonic plates, and to lateral pressure gradients induced by rising plumes and sinking slabs. Here we present results from such models for the Atlantic realm in the Cenozoic, and link them to seismically inferred anisotropy along with mantle flow retrodictions from inverse geodynamic modeling. Our analytical paleo-mantle-flow indicates that (1) material sourced by plumes is carried towards slab locations, as expected, (2) it is broadly consistent with the orientation of seismic azimuthal anisotropy, and (3) it agrees with the large-scale flow patterns and amplitudes from mantle flow retrodictions. Our results suggest using a hierarchy of models together with growing geological constraints on past plate motions and dynamic topography to gain a better understanding of paleo-mantle-flow.
KW - Couette/Poiseuille flow
KW - Geodynamic retrodiction
KW - Global geodynamics
KW - Hiatus maps
KW - Mantle convection
KW - Seismic anisotropy
U2 - 10.1016/j.pepi.2023.107045
DO - 10.1016/j.pepi.2023.107045
M3 - Journal article
AN - SCOPUS:85159610238
VL - 340
JO - Physics of the Earth and Planetary Interiors
JF - Physics of the Earth and Planetary Interiors
SN - 0031-9201
M1 - 107045
ER -
ID: 361844787