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<datestamp>2018-01-11</datestamp>
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<title lang=en>Kilometre-scale polygonal seabed depressions in the Hatton Basin, NE Atlantic Ocean: Constraints on the origin of polygonal faulting</title>
<creator>Berndt, C.</creator>
<creator>Jacobs, Colin</creator>
<creator>Evans, Alan</creator>
<creator>GAY, Aurélien</creator>
<creator>Elliot, Gavin</creator>
<creator>Long, David</creator>
<creator>Hitchen, Kenneth</creator>
<contributor>GEOMAR - Helmholtz Centre for Ocean Research [Kiel] (GEOMAR)</contributor>
<contributor>National Oceanography Centre, Southampton ; Université du Québec</contributor>
<contributor>National Oceanography Centre, Southhampton ; Université du Québec</contributor>
<contributor>Bassins ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Imperial College London</contributor>
<contributor>British Geological Survey [Edinburgh]</contributor>
<description>International audience</description>
<source>ISSN: 0025-3227</source>
<source>Marine Geology</source>
<publisher>Elsevier</publisher>
<identifier>hal-00772468</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00772468</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00772468</source>
<source>Marine Geology, Elsevier, 2012, 332-334, pp.126-133. 〈10.1016/j.margeo.2012.09.013〉</source>
<identifier>DOI : 10.1016/j.margeo.2012.09.013</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.margeo.2012.09.013</relation>
<language>en</language>
<subject lang=en>Polygonal faulting</subject>
<subject lang=en>Silicate diagenesis</subject>
<subject lang=en>Dewatering</subject>
<subject lang=en>Subsurface sediment deformation</subject>
<subject lang=en>Seismic data</subject>
<subject lang=en>Multibeam bathymetry data</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Polygonal faulting is a widespread phenomenon in sedimentary basins worldwide. It changes basin-scale fluid flow patterns and alters the physical properties of the sediments making it important for hydrocarbon exploration and geohazard analysis. It is generally accepted that polygonal fault patterns derive from dewatering and compaction of the host sediments, but there is debate regarding the processes that control polygonal faulting. New multibeam-bathymetry data from the Hatton Basin, NE Atlantic, show up to 10 m deep and 200-600 m wide troughs at the seabed. They connect to each other forming polygons that are several hundred metres across, i.e. of similar size as buried polygonal fault systems observed in 3D seismic data. The troughs are symmetrical and resemble elongated pockmarks. Previously unpublished high-resolution 2D seismic data from the same area show seismic disturbance zones similar to pipes observed under pockmarks elsewhere as well as faults that have all the characteristics of polygonal fault systems. The observation of the wide disturbance zones is enigmatic, as they appear to follow the polygonal seafloor pattern. The observed extent of the polygonal sediment contraction system is substantial covering almost 37,000 km2. We calculate that some 2600 km3 of possibly carbon-bearing fluids have been expelled from this system and we expect that this will affect the benthic ecosystems, although so far there is only limited evidence for chemosynthetic habitats.</description>
<date>2012-12-01</date>
</dc>
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