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Stratigraphic Architecture, Seismic and Dynamic Signature of a Sand-rich Turbidite Ramp, Cime Dieu de Delfy Outcrop, Grès d’Annot Formation, France

By
P. Joseph
P. Joseph
1
Institut Français du Pétrole, Rueil Malmaison, France
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N. Babonneau
N. Babonneau
2
Université de Brest, France
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A. Bourgeois
A. Bourgeois
1
Institut Français du Pétrole, Rueil Malmaison, France
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F. Guillocheau
F. Guillocheau
3
Géosciences Rennes, France
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J. Seguin
J. Seguin
4
Total E&P, Indonesia
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Published:
January 01, 2008

Abstract

The Cime Dieu de Deify outcrops are located in the Sanguinière Massif, at the western border of the Argentera-Mercantour Massif, 70 km (43 mi) northwest of Nice. They belong to the Grès d’Annot Formation, which outcrops in the Tertiary foreland basin of the French Southern Alps, formed by the Alpine orogeny. From a paleogeographic point of view, the Cime Dieu de Deify outcrops correspond to the central part of the Sanguinière subbasin. This subbasin was one of the tectonically induced narrow troughs (5-10 km [3-6 mi] wide) that controlled the turbidite sedimentation during late Eocene-Early Oligocene times. The Grès d’Annot Formation is 800 m (2620 ft) thick and corresponds to deposits on a sand-rich turbidite ramp. The deposits were probably fed from the Quatre Cantons fan-delta system, 30 km (19 mi) southeastward (Joseph and Lomas, 2004).

Thanks to numerous recent gullies, the Cime Dieu de Deify outcrops provide an excellent three-dimensional view of the architecture of the turbidite system. This paper describes the central part of the main cliff, 150 m (490 ft) thick by 1500 m (4920 ft) long; it offers both strike views (Sections 1 to 4) and dip views (Sections 4 to 8) of the architectural elements. The turbidite-ramp deposits are repetitively organized in coarsening-upward, then fining-upward, fourth-order, depositional sequences. Those are approximately 50 m (160 ft) thick, and are characterized by specific facies associations and architectural elements: FA-1 corresponds to muddy-matrix conglomerates (muddy debris flows) that are 20 m (66 ft) thick and can

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Contents

AAPG Studies in Geology

Atlas of Deep-Water Outcrops

Tor H. Nilsen
Tor H. Nilsen
Desceased
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Roger D. Shew
Roger D. Shew
University of North Carolina
Wilmington, North Carolina
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Gary S. Steffens
Gary S. Steffens
Shell International E&P
Houston, Texas
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Joseph R. J. Studlick
Joseph R. J. Studlick
Maersk Oil America Inc.
Houston, Texas
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American Association of Petroleum Geologists
Volume
56
ISBN electronic:
9781629810331
Publication date:
January 01, 2008

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