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Using bathymetry to identify basin inversion structures Survey

VSA Author: Jenny Collier
Regions: 5
Scenes: 0
Interpretations: 0
Date Created: 2010-08-18

High-resolution bathymetry is used to derive a new structural interpretation of a submerged inverted graben on the English Channel shelf (northwest Europe). The bathymetry provides a continuous plan-view image of the bedrock geology and resolves fine structural detail, particularly in areas of steeply dipping strata where traditional seismic imaging fails. The imagery, combined with shallow core, deep borehole, and two-dimensional seismic reflection data, shows a marked asymmetry in the bedrock outcrop and structural style, both across and along the axis of the basin. For example, the oldest synrift rocks crop out in a complex south-verging anticline along one margin, whereas more massively bedded younger rocks are folded into a simpler anticline at the other. Comparison of our observations with both recent analog modeling and a neighboring inverted basin highlights the importance of the mechanical properties of the basin stratigraphy in controlling the structural development. We conclude that the inversional asymmetry developed because of the distribution of strong competence contrasts within the synrift fill. Also see Collier et al. (2006), publication link in the docs & links section.



Regional Projects related to this Survey

Basin inversion in the English Channel 1 Regional Project

VSA Author: Jenny Collier
Scenes: 1
Interpretations: 1
Date Created: 2010-08-18

Shaded relief perspective view of seabed bathymetry and seismic line in the Channel Basin. The inset shows the approximate image location. Image presented at the "Frontiers of Seismic Geomorphology" showcase held at the Geological Society, London, June, 2010.

Basin inversion in the English Channel 2 Regional Project

VSA Author: Jenny Collier
Scenes: 0
Interpretations: 1
Date Created: 2010-08-18

Shaded relief perspective view showing details of seabed outcrop adjacent to the northern margin of the Channel basin. Image presented at the "Frontiers of Seismic Geomorphology" showcase held at the Geological Society, London, June, 2010.

Basin inversion in the English Channel 3 Regional Project

VSA Author: Jenny Collier
Scenes: 1
Interpretations: 1
Date Created: 2010-08-18

Shaded relief perspective view of seabed bathymetry and seismic line showing details of seabed outcrop adjacent to the northern margin of the Channel basin. Image presented at the "Frontiers of Seismic Geomorphology" showcase held at the Geological Society, London, June, 2010.

Basin inversion in the English Channel 4 Regional Project

VSA Author: Jenny Collier
Scenes: 0
Interpretations: 1
Date Created: 2010-08-18

Shaded relief perspective view showing details of seabed outcrop adjacent to the south-western margin of the Channel basin. White dashed lines mark stratigraphic boundaries and black dashed lines mark structural elements. Image presented at the "Frontiers of Seismic Geomorphology" showcase held at the Geological Society, London, June, 2010.

Basin inversion in the English Channel 5 Regional Project

VSA Author: Jenny Collier
Scenes: 1
Interpretations: 1
Date Created: 2010-08-18

Shaded relief perspective view of seabed bathymetry and seismic line showing details of seabed outcrop adjacent to the northern margin of the Channel basin. Note contrasting structural style to the inversion anticline shown in Figs.2 and 3. Image presented at the "Frontiers of Seismic Geomorphology" showcase held at the Geological Society, London, June, 2010.



Details:

  • Survey Administrator:
    • Taija Torvela
  • VSA Author:
    • Jenny Collier

Geological Context

Tectonics
Inversion, Rifts

Geographic Context

Physical Geography
Marginal Seas, Shelves

Political Geography
United Kingdom of Great Britain & Northern Ireland

Geophysics

Survey Information
Marine, Multichannel 2D