Titre :

The Miocene Sommières basin, SE France: Bioclastic carbonates in a tide-dominated depositional system

Auteur(s) :

Reynaud, Jean-Yves [Auteur]
Institut des Sciences de la Terre de Paris [iSTeP]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Université de Lille
James, Noël P. [Auteur]
Queen's University [Kingston, Canada]

Titre de la revue :

Sedimentary Geology

Pagination :

360-373

Éditeur :

Elsevier

Date de publication :

2012

ISSN :

0037-0738

Mot(s)-clé(s) en anglais :

Burdigalian
Tidal
Seaway
Heterozoan
Carbonates
France

Discipline(s) HAL :

Planète et Univers [physics]

Résumé en anglais : [en]

The Miocene Sommières Basin in SE France is a semi-enclosed depression that was connected to the Mediterranean Sea by a flooded paleo-incised valley and then filled by a suite of sediments comprising carbonate grains coming ...
Lire la suite >The Miocene Sommières Basin in SE France is a semi-enclosed depression that was connected to the Mediterranean Sea by a flooded paleo-incised valley and then filled by a suite of sediments comprising carbonate grains coming from temperate factories that were largely deposited in tidal-dominated paleoenvironments. The strata are partitioned into two sequences that reflect repeated flooding of the incised valley system, one of several similar situations in this region of France. The carbonate grains are mostly bioclasts, namely from barnacles, bryozoans, coralline algae (encrusting, branching, and rhodoliths), echinoids, and benthic foraminifers (large and small) with ostracods, sponge spicules and planktic foraminifers prominent in muddy facies. Particles were produced by shallow water carbonate factories on hard substrates (valley walls in particular), associated with subaqueous dunes, and in deeper water basinal settings. Each depositional sequence is underlain by an eroded and bored hard surface that is progressively overlain by TST subaqueous tidal dunes or storm deposits that grade up, in one case, into HST marls (the HST of the upper sequence has been removed by erosion). The lower sequence is ebb tide dominated whereas the upper sequence is flood tide dominated. The succession is interpreted to represent a TST whose tidal currents were focused by the narrow valley and a HST that reflected flooding of the overbanks. This stratigraphic and depositional motif is comparable to that in other spatially separated Neogene paleovalleys that are filled with tide-dominated clastic carbonates in the region. Together with other recently documented similar systems, these limestones constitute an important new group of carbonate sand bodies in the carbonate depositional realm.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

• Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL