Dynamics of the African Plate 75 Ma : From Plate Kinematic Reconstructions to Intraplate Paleo-Stresses. / Wouters, Marius; Perez Diaz, Lucia; Tuck-Martin, Amy; Eagles, Graeme; Adam, Jurgen; Govers, Rob.

In: Tectonics, Vol. 40, No. 7, 07.07.2021, p. 1-29.

Research output: Contribution to journalArticlepeer-review

E-pub ahead of print

Standard

Dynamics of the African Plate 75 Ma : From Plate Kinematic Reconstructions to Intraplate Paleo-Stresses. / Wouters, Marius; Perez Diaz, Lucia; Tuck-Martin, Amy; Eagles, Graeme; Adam, Jurgen; Govers, Rob.

In: Tectonics, Vol. 40, No. 7, 07.07.2021, p. 1-29.

Research output: Contribution to journalArticlepeer-review

Harvard

APA

Vancouver

Author

BibTeX

@article{54be5e0ab2db4e51ba2154f8974841ee,
title = "Dynamics of the African Plate 75 Ma: From Plate Kinematic Reconstructions to Intraplate Paleo-Stresses",
abstract = "Plate reconstruction studies show that the Neotethys Ocean was closing due to the convergence of Africa and Eurasia toward the end of the Cretaceous. The period around 75 Ma reflects the onset of continental collision between the two plates as convergence continued to be taken up mostly by subduction of the Neotethys slab beneath Eurasia. The Owen transform plate boundary in thenortheast accommodated the fast northward motion of the Indian plate relative to the African plate. The rest of the plate was surrounded by mid-ocean ridges. Africa was experiencing continent-wide rifting related to northeast-southwest extension. We aim to quantify the forces and paleostresses that may havedriven this continental extension. We use the latest plate kinematic reconstructions in a grid search to estimate horizontal gravitational stresses (HGSs), plate boundary forces, and the plate's interaction with the asthenosphere. The contribution of dynamic topography to HGSs is based on recent mantle convection studies. We model intraplate stresses and compare them with the strain observations. The fit to observations favors models where dynamic topography amplitudes are smaller than 300 m. The resultsalso indicate that the net pull transmitted from slab to the surface African plate was low. To put this into context, we notice that available tectonic reconstructions show fragmented subduction zones and various colliding micro-continents along the northern margin of the African plate around this time. We therefore interpret a low net pull as resulting from either a small average slab length or from the micro-continents' resistance to subduction.",
author = "Marius Wouters and {Perez Diaz}, Lucia and Amy Tuck-Martin and Graeme Eagles and Jurgen Adam and Rob Govers",
year = "2021",
month = jul,
day = "7",
doi = "10.1029/2020tc006355",
language = "English",
volume = "40",
pages = "1--29",
journal = "Tectonics",
issn = "0278-7407",
publisher = "American Geophysical Union",
number = "7",

}

RIS

TY - JOUR

T1 - Dynamics of the African Plate 75 Ma

T2 - From Plate Kinematic Reconstructions to Intraplate Paleo-Stresses

AU - Wouters, Marius

AU - Perez Diaz, Lucia

AU - Tuck-Martin, Amy

AU - Eagles, Graeme

AU - Adam, Jurgen

AU - Govers, Rob

PY - 2021/7/7

Y1 - 2021/7/7

N2 - Plate reconstruction studies show that the Neotethys Ocean was closing due to the convergence of Africa and Eurasia toward the end of the Cretaceous. The period around 75 Ma reflects the onset of continental collision between the two plates as convergence continued to be taken up mostly by subduction of the Neotethys slab beneath Eurasia. The Owen transform plate boundary in thenortheast accommodated the fast northward motion of the Indian plate relative to the African plate. The rest of the plate was surrounded by mid-ocean ridges. Africa was experiencing continent-wide rifting related to northeast-southwest extension. We aim to quantify the forces and paleostresses that may havedriven this continental extension. We use the latest plate kinematic reconstructions in a grid search to estimate horizontal gravitational stresses (HGSs), plate boundary forces, and the plate's interaction with the asthenosphere. The contribution of dynamic topography to HGSs is based on recent mantle convection studies. We model intraplate stresses and compare them with the strain observations. The fit to observations favors models where dynamic topography amplitudes are smaller than 300 m. The resultsalso indicate that the net pull transmitted from slab to the surface African plate was low. To put this into context, we notice that available tectonic reconstructions show fragmented subduction zones and various colliding micro-continents along the northern margin of the African plate around this time. We therefore interpret a low net pull as resulting from either a small average slab length or from the micro-continents' resistance to subduction.

AB - Plate reconstruction studies show that the Neotethys Ocean was closing due to the convergence of Africa and Eurasia toward the end of the Cretaceous. The period around 75 Ma reflects the onset of continental collision between the two plates as convergence continued to be taken up mostly by subduction of the Neotethys slab beneath Eurasia. The Owen transform plate boundary in thenortheast accommodated the fast northward motion of the Indian plate relative to the African plate. The rest of the plate was surrounded by mid-ocean ridges. Africa was experiencing continent-wide rifting related to northeast-southwest extension. We aim to quantify the forces and paleostresses that may havedriven this continental extension. We use the latest plate kinematic reconstructions in a grid search to estimate horizontal gravitational stresses (HGSs), plate boundary forces, and the plate's interaction with the asthenosphere. The contribution of dynamic topography to HGSs is based on recent mantle convection studies. We model intraplate stresses and compare them with the strain observations. The fit to observations favors models where dynamic topography amplitudes are smaller than 300 m. The resultsalso indicate that the net pull transmitted from slab to the surface African plate was low. To put this into context, we notice that available tectonic reconstructions show fragmented subduction zones and various colliding micro-continents along the northern margin of the African plate around this time. We therefore interpret a low net pull as resulting from either a small average slab length or from the micro-continents' resistance to subduction.

U2 - 10.1029/2020tc006355

DO - 10.1029/2020tc006355

M3 - Article

VL - 40

SP - 1

EP - 29

JO - Tectonics

JF - Tectonics

SN - 0278-7407

IS - 7

ER -