Long term evolution and internal architecture of a high-energy banner ridge from seismic survey of Banc du Four (Western Brittany, France).
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| Title: | Long term evolution and internal architecture of a high-energy banner ridge from seismic survey of Banc du Four (Western Brittany, France). |
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| Authors: | Franzetti, Marcaurelio1 marcaurelio.franzetti@hotmail.fr, Le Roy, Pascal1, Garlan, Thierry2, Graindorge, David1, Sukhovich, Alexey1, Delacourt, Christophe1, Le Dantec, Nicolas1 |
| Source: | Marine Geology. Nov2015, Vol. 369, p196-211. 16p. |
| Subjects: | Continental shelf, Sand waves, Radiocarbon dating, Tidal currents, Holocene Epoch |
| Geographic Terms: | Brittany (France) |
| Abstract: | The recent completion of a coupled seismic and swath bathymetric survey, conducted across the sand ridge system of the Banc du Four located on the Atlantic continental shelf of Brittany (Mer d’Iroise, France), provided new data for the study of the long term evolution of deep tidal sand ridges. Five seismic units are distinguished within the ridge, separated by pronounced major bounding surfaces. The basal unit is interpreted to be shoreface deposits forming the core of the ridge. It is overlaid by a succession of marine sand dunes fields forming the upper units. Sandwave climbing, which combines progradation and accretion, is the major process controlling the growth of the ridge. The elevation of the preserved dune foresets reaches values of about 20–30 m within the ridge. The foresets indicate a combination of giant dunes characterized by numerous steep (up to 20°) clinoforms corresponding to a high-energy depositional environment. Moreover, the presence of scour pits linked to the 3D geometries of giant dunes allow the growth of bedforms migrating oblique to the orientation of giant dune crest lines. All of the radiocarbon ages of the biogenic surficial deposits of the Banc du Four range from 10,036 to 2748 cal years B.P. and suggest the Banc du Four has grown during the last sea-level rise. The apparent absence of recent surface deposits could be caused by a change in benthic biogenic productivity or the non-conservation of recent deposits. In contrast, the presence of relatively old sands at the top of the ridge could be explained by the reworking and leakage of the lower units that outcrop locally at the seabed across the ridge. Moreover, the long-term evolution of the ridge appears strongly controlled by the morphology of the igneous basement. The multiphase accretion of the ridge is closely linked to the presence of a residual tidal current eddy, consecutive with the progressive flooding of the coastal promontories and straits that structured the igneous basement. Therefore, the Banc du Four should be thought of as a representative example of a large-scale high-energy banner bank. [ABSTRACT FROM AUTHOR] |
| Copyright of Marine Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 110533060 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Long term evolution and internal architecture of a high-energy banner ridge from seismic survey of Banc du Four (Western Brittany, France). – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Franzetti%2C+Marcaurelio%22">Franzetti, Marcaurelio</searchLink><relatesTo>1</relatesTo><i> marcaurelio.franzetti@hotmail.fr</i><br /><searchLink fieldCode="AR" term="%22Le+Roy%2C+Pascal%22">Le Roy, Pascal</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Garlan%2C+Thierry%22">Garlan, Thierry</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Graindorge%2C+David%22">Graindorge, David</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sukhovich%2C+Alexey%22">Sukhovich, Alexey</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Delacourt%2C+Christophe%22">Delacourt, Christophe</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Le+Dantec%2C+Nicolas%22">Le Dantec, Nicolas</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Marine+Geology%22">Marine Geology</searchLink>. Nov2015, Vol. 369, p196-211. 16p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Continental+shelf%22">Continental shelf</searchLink><br /><searchLink fieldCode="DE" term="%22Sand+waves%22">Sand waves</searchLink><br /><searchLink fieldCode="DE" term="%22Radiocarbon+dating%22">Radiocarbon dating</searchLink><br /><searchLink fieldCode="DE" term="%22Tidal+currents%22">Tidal currents</searchLink><br /><searchLink fieldCode="DE" term="%22Holocene+Epoch%22">Holocene Epoch</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Brittany+%28France%29%22">Brittany (France)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The recent completion of a coupled seismic and swath bathymetric survey, conducted across the sand ridge system of the Banc du Four located on the Atlantic continental shelf of Brittany (Mer d’Iroise, France), provided new data for the study of the long term evolution of deep tidal sand ridges. Five seismic units are distinguished within the ridge, separated by pronounced major bounding surfaces. The basal unit is interpreted to be shoreface deposits forming the core of the ridge. It is overlaid by a succession of marine sand dunes fields forming the upper units. Sandwave climbing, which combines progradation and accretion, is the major process controlling the growth of the ridge. The elevation of the preserved dune foresets reaches values of about 20–30 m within the ridge. The foresets indicate a combination of giant dunes characterized by numerous steep (up to 20°) clinoforms corresponding to a high-energy depositional environment. Moreover, the presence of scour pits linked to the 3D geometries of giant dunes allow the growth of bedforms migrating oblique to the orientation of giant dune crest lines. All of the radiocarbon ages of the biogenic surficial deposits of the Banc du Four range from 10,036 to 2748 cal years B.P. and suggest the Banc du Four has grown during the last sea-level rise. The apparent absence of recent surface deposits could be caused by a change in benthic biogenic productivity or the non-conservation of recent deposits. In contrast, the presence of relatively old sands at the top of the ridge could be explained by the reworking and leakage of the lower units that outcrop locally at the seabed across the ridge. Moreover, the long-term evolution of the ridge appears strongly controlled by the morphology of the igneous basement. The multiphase accretion of the ridge is closely linked to the presence of a residual tidal current eddy, consecutive with the progressive flooding of the coastal promontories and straits that structured the igneous basement. Therefore, the Banc du Four should be thought of as a representative example of a large-scale high-energy banner bank. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Marine Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.margeo.2015.08.019 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 196 Subjects: – SubjectFull: Continental shelf Type: general – SubjectFull: Sand waves Type: general – SubjectFull: Radiocarbon dating Type: general – SubjectFull: Tidal currents Type: general – SubjectFull: Holocene Epoch Type: general – SubjectFull: Brittany (France) Type: general Titles: – TitleFull: Long term evolution and internal architecture of a high-energy banner ridge from seismic survey of Banc du Four (Western Brittany, France). Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Franzetti, Marcaurelio – PersonEntity: Name: NameFull: Le Roy, Pascal – PersonEntity: Name: NameFull: Garlan, Thierry – PersonEntity: Name: NameFull: Graindorge, David – PersonEntity: Name: NameFull: Sukhovich, Alexey – PersonEntity: Name: NameFull: Delacourt, Christophe – PersonEntity: Name: NameFull: Le Dantec, Nicolas IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: Nov2015 Type: published Y: 2015 Identifiers: – Type: issn-print Value: 00253227 Numbering: – Type: volume Value: 369 Titles: – TitleFull: Marine Geology Type: main |
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