| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Analysis of Holocene sedimentary features on the Adriatic shelf from 3D very high resolution seismic data (Triad survey)
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| Autores: |
Marsset, Tania
Marsset, Bruno
Thomas, Yannick
Cattaneo, Antonio
Thereau, Estelle
Trincardi, F
Cochonat, Pierre
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| Data: |
2004-12
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| Ano: |
2004
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| Palavras-chave: |
Bottom hugging currents
Sediment deformation
3D VHR seismic
Adriatic shelf
Late Holocene
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| Resumo: |
Very High Resolution (VHR) 3D seismic data were collected on the Adriatic shelf offshore the city of Ortona in order to define the small-scale geometric complexity of late Holocene deposits. Three groups of units are distinguished from the bottom up: (1) units U1 to U3 forming the Transgressive System Tract (TST); (2) units U4 and U5 representing the condensed interval deposited on the Maximum flooding surface (MFS) and the basal unit of the High stand System Tract (HST); and (3) U6 to U 10 forming the progradational units of the HST. The muddy HST deposits show seafloor and subsurface sedimentary features over up to 40% of its extent on the Adriatic shelf. In the area offshore Ortona, the HST shows shore-parallel undulations in water depth of ca. 30-70 m and mud reliefs in water depth of ca. 70-110 m. The mud reliefs are subcircular in plan view and occur in swarms, perpendicular to the regional contour, that are connected to each other by shore-parallel junctions. The genesis of these features is interpreted as a combination of two different mechanisms: (1) sediment deformation in relation with the condensed section; and (2) depositional process related to shore-parallel currents interacting with topographic irregularities. The evolution of the HST sedimentary pattern is closely related to a "key unit" (U5) that influences both the seaward transition from linear to complex features and the stacking pattern.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/2004/publication-496.pdf
DOI:10.1016/j.margeo.2004.10.002
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| Editor: |
Elsevier
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| Relação: |
http://archimer.ifremer.fr/doc/00000/496/
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| Formato: |
application/pdf
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| Fonte: |
Marine Geology (0025-3227) (Elsevier), 2004-12 , Vol. 213 , N. 1-4 , P. 73-89
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| Direitos: |
2004 Elsevier B.V. All rights reserved
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