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https://doi.org/10.5194/se-2020-120
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2020-120
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  27 Jul 2020

27 Jul 2020

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This preprint is currently under review for the journal SE.

The role of Edge-Driven Convection in the generation of volcanism I: a 2D systematic study

Antonio Manjón-Cabeza Córdoba1 and Maxim Ballmer2,1 Antonio Manjón-Cabeza Córdoba and Maxim Ballmer
  • 1ETH Zürich, Department of Earth Sciences, Institute of Geophysics
  • 2University College London, Department of Earth Sciences

Abstract. The origin of intraplate volcanism is not explained by the plate tectonic theory, and several models have been put forward for explanation. One of these models involves Edge-Driven Convection (EDC), in which cold and thick continental lithosphere is juxtaposed to warm and thin oceanic lithosphere to trigger convective instability. To test whether EDC can produce long-lived high-volume magmatism, we run numerical models of EDC for a wide range of mantle properties and edge (i.e., the oceanic-continental transition) geometries. We find that the most important parameters that govern EDC are the rheological paramaters mantle viscosity η0 and activation energy Ea. However, even the maximum melting volumes found in our models are insufficient to account for island-building volcanism on old seafloor, such as at the Canary Islands and Cape Verde. Also, beneath old seafloor, localized EDC-related melting commonly transitions into widespread melting due to small-scale sublithospheric convection, inconsistent with the distribution of volcanism at these volcanic chains. In turn, EDC is a good candidate to sustain the formation of small seamounts on young seafloor, as it is a highly transient phenomenon that occurs in all our models soon after initiation. In a companion paper, we investigate the implications of interaction of EDC with mantle-plume activity.

Antonio Manjón-Cabeza Córdoba and Maxim Ballmer

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Antonio Manjón-Cabeza Córdoba and Maxim Ballmer

Antonio Manjón-Cabeza Córdoba and Maxim Ballmer

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