EGU22-8005
https://doi.org/10.5194/egusphere-egu22-8005
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Contrasting passive and transform margin tectonic history and sedimentation: insights from 3D numerical modelling and observations from the Atlantic

Attila Balazs1, Taras Gerya1, Dave May2, and Gabor Tari3
Attila Balazs et al.
  • 1ETH Zurich, Department of Earth Sciences, Zurich, Switzerland (attila.balazs@erdw.ethz.ch)
  • 2Scripps Institution of Oceanography, UC San Diego, USA
  • 3OMV Upstream, Vienna, 1020, Austria

Passive and transform margins emerging during continental rifting and opening of oceanic basins are fundamental elements of plate tectonics. It has been suggested that inherited structures, variable plate divergence velocities and surface processes exert a first order control on the topographic, bathymetric and magmatic evolution and thermal history of these margins and related sedimentary basins. We conducted 3D thermo-mechanical numerical experiments with the code I3ELVIS coupled to surface processes modelling (FDSPM) to simulate the dynamics of continental rifting, continental transform fault zone formation and persistent oceanic transform faulting. Numerical modelling results allow to explain the first order observations from passive and transform margins, such as diachronous rifting, strain localization into individual oblique rift basins and the opening of structurally separate oceanic basins connected in an open marine environment. In addition, the models reproduce the rise of transform marginal ridges and submarine plateaus, continental crustal slivers within oceanic transforms and their interaction with erosion and sedimentation. Model results are compared and validated by seismic and well data from passive and transform margin segments of the Atlantic.

How to cite: Balazs, A., Gerya, T., May, D., and Tari, G.: Contrasting passive and transform margin tectonic history and sedimentation: insights from 3D numerical modelling and observations from the Atlantic, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-8005, https://doi.org/10.5194/egusphere-egu22-8005, 2022.

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