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Publication . Article . Other literature type . 2005

Sedimentary sequences in the Gulf of Lion: A record of 100,000 years climatic cycles

Marina Rabineau; Serge Berné; Daniel Aslanian; Jean-Louis Olivet; Philippe Joseph; François Guillocheau; Jean-François Bourillet; +2 Authors
Open Access
English
Published: 01 Jan 2005
Publisher: Elsevier
Country: France
Abstract

The wide continental shelf of the Gulf of Lion (up to 70 km) has been the object of numerous investigations since the early days of oceanography. Yet, the question of sequences duration, the mechanisms of deposition and factors implied remained unanswered. A study of a very dense grid of Very High Resolution (VHR) seismic reflection (Sparker) data associated with surficial cores both, collected by IFREMER between 1992 and 2001 on the outer shelf and upper slope offshore of Sète in the Languedoc region gives a new insight into these issues. Analysis of the 3D geometry of the sedimentary record reveals a basic depositional pattern consisting of a pair of horizontally juxtaposed and downlapping prisms. Prism PI with low angle clinoforms (<1°) lies on the upper part of the shelf and is interpreted to be prodeltaic-offshore deposits. Prism PII with steeply dipping clinoforms (approximately 4°) lies on the outer shelf between 40 and 70 km from the present day coastline and is interpreted to be littoral deposits. Results obtained from integrating lithology, palynology, micropaleontology, seismic stratigraphy, stratigraphic simulation, support the hypothesis that the basic depositional pattern records a 100 000-years glacioeustatic (interglacial/glacial) cycle. As previously suggested by Aloïsi [Aloïsi, J.C., 1986. Sur un modèle de sédimentation deltaïque: contribution à la connaissance des marges passive, Thèse de Doctorat d'Etat. Université de Perpignan, 162 pp], prisms PI corresponds to deposition at high sea level and prisms PII to deposition during low sea level at glacial maxima. Five sequences of paired prisms capped by five major erosion surfaces have been identified and modelled showing that the corresponding glacioeustatic cycles (the last five cycles at least) are recorded on the shelf of the western part of the Gulf of Lion.

Subjects by Vocabulary

Microsoft Academic Graph classification: Sedimentary depositional environment Micropaleontology Lithology Glacial period Interglacial Paleontology Oceanography Sea level Continental shelf geography.geographical_feature_category geography Geology Sedimentary rock

Subjects

Stratigraphic modelling, Cores, High resolution seismic data, Glacioeustatism, Climatic cycles, Gulf of Lion, Western Mediterranean, Western Mediterranean, Gulf of Lion, Sequences, Climatic cycles, Glacioeustatism, High-resolution seismic data, Cores, Stratigraphic modelling, [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy, [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology, [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology, [SDU.STU.ST] Sciences of the Universe [physics]/Earth Sciences/Stratigraphy, [SDU.STU.PG] Sciences of the Universe [physics]/Earth Sciences/Paleontology, Stratigraphy, Economic Geology, Geology, Geophysics, Oceanography

2.3.1 Group 1: Monaco, Got, Aloïsi et al (1970-1980's) 2 km 4 km 6 km 8 km 10 km 12 km 50 50 6

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