Preprints
https://doi.org/10.5194/egusphere-2023-2656
https://doi.org/10.5194/egusphere-2023-2656
16 Nov 2023
 | 16 Nov 2023

Magma-poor continent-ocean transition zones of the southern North Atlantic: a wide-angle seismic synthesis of a new frontier

J. Kim Welford

Abstract. Magma-poor rifted margins, and their corresponding potential zones of exhumed serpentinized mantle, represent a unique class of tectonic boundaries with enormous promise for advancing the energy transition, such as with hydrogen production, carbon sequestration, and in the search for critical minerals. In this study, a synthesis of the results from seismic refraction/wide-angle reflection profiling, and resulting velocity models, across the continent-ocean transitions of the southern North Atlantic Ocean is presented. The models are assessed and compared to understand characteristic basement types and upper mantle behaviour across the region and between conjugate margin pairs. Ultimately, this work highlights the variable nature of continent-ocean transition zones, even within the magma-poor rifted margin end-member case, and points to avenues for future research to fill the knowledge gaps that will accelerate the energy transition.

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J. Kim Welford

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2656', Anonymous Referee #1, 24 Nov 2023
    • AC1: 'Reply on RC1', J. Kim Welford, 11 Mar 2024
  • RC2: 'Comment on egusphere-2023-2656', Frédéric Mouthereau, 02 Jan 2024
    • AC2: 'Reply on RC2', J. Kim Welford, 11 Mar 2024
  • RC3: 'Comment on egusphere-2023-2656', Georgios-Pavlos Farangitakis, 08 Feb 2024
    • AC3: 'Reply on RC3', J. Kim Welford, 11 Mar 2024

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2656', Anonymous Referee #1, 24 Nov 2023
    • AC1: 'Reply on RC1', J. Kim Welford, 11 Mar 2024
  • RC2: 'Comment on egusphere-2023-2656', Frédéric Mouthereau, 02 Jan 2024
    • AC2: 'Reply on RC2', J. Kim Welford, 11 Mar 2024
  • RC3: 'Comment on egusphere-2023-2656', Georgios-Pavlos Farangitakis, 08 Feb 2024
    • AC3: 'Reply on RC3', J. Kim Welford, 11 Mar 2024
J. Kim Welford
J. Kim Welford

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Short summary
The greening of the economy will require resources that can be found in the ocean, at the boundaries between continental and oceanic crust. I present a synthesis of the continent-ocean boundaries of the southern North Atlantic Ocean to assess their deep structures and to discuss how they were formed. With this knowledge, it is possible to start evaluating these regions of the Earth for their capacity to produce hydrogen and critical minerals, and to store excess carbon dioxide.