The role of condensed sections on seafloor instability: an example of the Gulf of Lions, Western Mediterranean

The role of condensed sections on seafloor instability: an example of the Gulf of Lions, Western Mediterranean

American Geophysical Union (AGU) Fall Meeting, 9-13 December 2019, San Francisco

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Main Authors: Badhani, Shray, Cattaneo, Antonio, Urgeles, Roger, Mencaroni, Davide, Dennielou, Bernard, Leroux, Estelle, Colin, Florent, Rabineau, M., Droz, Laurence
Format: comunicación de congreso biblioteca
Published: American Geophysical Union 2019-12-13
Online Access:http://hdl.handle.net/10261/207490
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spelling dig-icm-es-10261-2074902020-04-14T10:18:37Z The role of condensed sections on seafloor instability: an example of the Gulf of Lions, Western Mediterranean Badhani, Shray Cattaneo, Antonio Urgeles, Roger Mencaroni, Davide Dennielou, Bernard Leroux, Estelle Colin, Florent Rabineau, M. Droz, Laurence American Geophysical Union (AGU) Fall Meeting, 9-13 December 2019, San Francisco The Gulf of Lions (GoL) is a 200 km long, 70 km wide passive margin where alpine sediments delivered by the Rhone River are deposited on the Rhone delta and deep-sea fan. Seismic data displays multiple sedimentary sequences bounded by high-amplitude reflectors in the upper slope interfluve areas and turbiditic levees downslope. These sedimentary sequences are attributed, in the upper slope, to 100 kyr-glacio-eustatic cycles that initiated during the Mid-Pleistocene Transition, marking the onset of the Milankovitch cyclicity in the Western Mediterranean. The high-amplitude reflectors are interpreted as condensed sections. The GoL margin presents recurring mass transport deposits throughout the Plio-Quaternary succession. Previous studies highlighted a strong stratigraphic control on the landslide basal surfaces, where the basal surfaces of the landslides coincide with the high-amplitude reflectors. In this study, we show a detailed sedimentological and geotechnical analysis of a sediment core that penetrated one of these high-amplitude reflectors. The combined analysis of sediment cores and in situ penetrometer data (CPTu) shows elevated values of porosity, consistency limits, clay content and undrained shear strength compatible with hemipelagic sediments that deposited during sea-level highstands. The sediments corresponding to these high-amplitude reflectors are stiff and less sensitive than those deposited rapidly during the glacial and deglacial periods. Our results suggest that due to higher stiffness and shear strength, these layers do not essentially fail and rather become a basal surface over which sliding occurs 2020-04-14T10:17:58Z 2020-04-14T10:17:58Z 2019-12-13 2020-04-14T10:17:58Z comunicación de congreso http://purl.org/coar/resource_type/c_5794 2019 AGU Fall Meeting (2019) http://hdl.handle.net/10261/207490 https://agu.confex.com/agu/fm19/meetingapp.cgi/Paper/578348 Sí none American Geophysical Union
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
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region Europa del Sur
libraryname Biblioteca del ICM España
description American Geophysical Union (AGU) Fall Meeting, 9-13 December 2019, San Francisco
format comunicación de congreso
author Badhani, Shray
Cattaneo, Antonio
Urgeles, Roger
Mencaroni, Davide
Dennielou, Bernard
Leroux, Estelle
Colin, Florent
Rabineau, M.
Droz, Laurence
spellingShingle Badhani, Shray
Cattaneo, Antonio
Urgeles, Roger
Mencaroni, Davide
Dennielou, Bernard
Leroux, Estelle
Colin, Florent
Rabineau, M.
Droz, Laurence
The role of condensed sections on seafloor instability: an example of the Gulf of Lions, Western Mediterranean
author_facet Badhani, Shray
Cattaneo, Antonio
Urgeles, Roger
Mencaroni, Davide
Dennielou, Bernard
Leroux, Estelle
Colin, Florent
Rabineau, M.
Droz, Laurence
author_sort Badhani, Shray
title The role of condensed sections on seafloor instability: an example of the Gulf of Lions, Western Mediterranean
title_short The role of condensed sections on seafloor instability: an example of the Gulf of Lions, Western Mediterranean
title_full The role of condensed sections on seafloor instability: an example of the Gulf of Lions, Western Mediterranean
title_fullStr The role of condensed sections on seafloor instability: an example of the Gulf of Lions, Western Mediterranean
title_full_unstemmed The role of condensed sections on seafloor instability: an example of the Gulf of Lions, Western Mediterranean
title_sort role of condensed sections on seafloor instability: an example of the gulf of lions, western mediterranean
publisher American Geophysical Union
publishDate 2019-12-13
url http://hdl.handle.net/10261/207490
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