Stratigraphic Architecture, Seismic and Dynamic Signature of a Sand-rich Turbidite Ramp, Cime Dieu de Delfy Outcrop, Grès d’Annot Formation, France
P. Joseph, N. Babonneau, A. Bourgeois, F. Guillocheau, J. Seguin, 2008. "Stratigraphic Architecture, Seismic and Dynamic Signature of a Sand-rich Turbidite Ramp, Cime Dieu de Delfy Outcrop, Grès d’Annot Formation, France", Atlas of Deep-Water Outcrops, Tor H. Nilsen, Roger D. Shew, Gary S. Steffens, Joseph R. J. Studlick
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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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Tor H. Nilsen, a red-haired Scandinavian who stood more than six feet tall, died October 9, 2005, at his San Carlos, California, home. This was after a valiant five-year fight with melanoma cancer. He was 63. His ashes were scattered at his family plot in Norway in 2006.
He was born in New York City on November 29, 1941, to Mollie Abrahamson and Nils Marius Nilsen of Mandal, Norway, and was the first of their children to be born in the United States. After graduating from Brooklyn Tech, he earned his B.S. in geology from City College of New York in 1962. While there, his prowess on the basketball court impressed a scout from the New York Knicks, but Tor went on to graduate school and earned his M.S. and Ph.D. degrees in geology from the University of Wisconsin at Madison in 1964 and 1967, respectively. His M.S. thesis was a study of Precambrian metasedimentary deposits in the Lake Superior area, and his Ph.D. thesis was a study of Devonian alluvial-fan deposits of the Old Red Sandstone in western Norway.
Dr. Nilsen’s principal expertise was in depositional systems analysis, stratigraphic analysis, and the relationships among tectonics, eustasy, and sedimentation. He began his industry career in 1967 as a research geologist with the Shell Development Company in Houston, Texas, and Ventura, California, where he worked on the tectonics and sedimentation of Tertiary shelf systems of coastal California. He subsequently spent two years with the U.S. Army Corps of Engineers as the Military