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Updating geological knowledge of the Anglo-Parisian Basin from offshore mapping and investigations using very-high resolution seismic data

  • Paquet, Fabien
  • Lasseur, Eric
  • Thinon, Isabelle
  • Briais, Justine
  • Allanic, Cécile
  • Couëffé, Renaud
  • Benabdellouahed, M.
  • Dugué, Olivier
  • Tessier, Bernadette
  • Jollivet-Casteot, Martin
  • Gaullier, Virginie
  • Caline, Bruno
Publication Date
Jun 06, 2017
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As the French Geological Survey, one of the objectives of BRGM is the continuous updating of the geological knowledge of the French territory. Whereas the onshore area has been completely mapped and will be progressively rendered in 3D (RGF program), the geology of the continental shelf is mostly summarized at the 1:1,000,000 scale from the synthesis of various documents including 1:250,000 maps from the 70s.Since the late 90s, the use of recent very high resolution (VHR) marine seismic and bathymetric acquisition systems, together with precise positioning from GPS allow (i) to update the geological mapping and (ii) to reveal details that can only be provided with such kind of data. Recent data acquisition cruises, collaborations, and data sharing with other research institutes and companies (Universities, Ifremer, SHOM, Total,…) set up a framework to undertake modern geological mapping over the shelf and to answer scientific questions related to sedimentary basin evolution.The English Channel is one key area of study where sedimentary series of the Anglo-Parisian Basin outcrop directly at sea bed or lies under a thin plio-quaternary cover. This configuration provides a unique access to the meso-cenozoic series using VHR data and eases mapping.Besides mapping aspects, data acquired from 2013 to 2016 reveal details in the structure of contourites-like undulating geometries within the upper cretaceous chalk, as well as tectonic features along regional faults that help to better constrain their kinematics. Those data also provide new insights into the understanding of the “recent” paleovalley networks that are preserved over the English Channel.

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