Characteristics of axially-sourced turbidite sedimentation on an active wedge-top basin (Annot sandstone, SE France)

Autor: Salles, Lise, Ford, Mary, Joseph, phillipe
Přispěvatelé: Centre de Recherches Pétrographiques et Géochimiques (CRPG), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), IFP Energies nouvelles (IFPEN)
Jazyk: angličtina
Rok vydání: 2014
Předmět:
Zdroj: Marine and Petroleum Geology
Marine and Petroleum Geology, Elsevier, 2014, 56, pp.305-323. ⟨10.1016/j.marpetgeo,2014,01.020⟩
ISSN: 0264-8172
DOI: 10.1016/j.marpetgeo,2014,01.020⟩
Popis: International audience; In order to develop viable idepositional models for wedgetop basins, the control exerted by active structural relief on turbiditei depositional patterns should be weil understood at different scales (from limb slope to interconnecte;d synclinal troughs). This is particularly the case for systems with axial sediment supply, for which !little data are available. This paper presents a detailed field study of two depocentres in the Upper Eo~ene - Lower Oligocene Annot Sandstone of the alpine foreland basin of SE France, which was fed axia:lly from the Corsica-Sardinia Massif to the south. The depocentres are partially preserved in a series of outliers. The Annot outlier preserves turbidites deposited on the gently dipping limb of an asymmetrical syn-depositional syncline, while, to the north, the NE Grand Coyer outlier preserves highly confined turbidites deposited on a steep and complex synclinal limb. Structural stratigraphic and sedimentoibgical data demonstrate that these turbidite depocentres were controlled by active folding and faulting, including oblique structures. Structural contrais were more complex on the steep eastern synclinallimbsi th an on shallowly dipping western limbs. Integration of palaeocurrent data allow feeder pathways and their evolving interconnections to be traced between successive downstream depocentres in space and tib-Je. A 30 depositional model for axially supplied active wedgetop depocentres is proposed and conipared to transversely fed wedgetop systems, particularly in terms of facies distributions and variations in reservoir quality. Axially supplied systems are marked by a higher lateral confinement and, as a consequence, are more sensitive to relief created by oblique structures. As a result facies distributions are more strongly controlled by (active or inactive) substratum reliefthan by intrinsic flow properties, leading to a' higher potential for stratigraphie traps.
Databáze: OpenAIRE
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