Journal ArticleDOI
The use of slump structures as palaeoslope orientation estimators
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TLDR
In this article, two main methods of estimating palaeoslope direction from slump structure orientation data are reviewed: the mean axis method and the separation arc method, where the bisector of a planar separation angle between groups of slump folds with opposite downplunge asymmetry is used.Abstract:
The two main methods of estimating palaeoslope direction from slump structure orientation data are reviewed. The mean axis method takes the downslope direction as the perpendicular to the mean slump fold axis. The separation are method estimates the downslope direction by the bisector of a planar separation angle between groups of slump folds with opposite downplunge asymmetry. The advantages and disadvantages of each method are considered in detail, by reference first to idealized slump fold distributions and then to a compilation of sixty natural slump fold axis distributions, mostly from published data.
Among the advantages of the mean axis method are the ease of deriving confidence limits for estimates and its applicability where fold asymmetry data are unavailable. The main advantage of the separation are method is its validity for strongly skewed fold axis samples. The statistical robustness of the mean axis method, however, due to its reliance on average properties of data, makes it more generally reliable than the separation arc method which depends on extreme properties of data. A procedure for determining palaeoslope directions is suggested which reflects the respective strengths of the two methods.read more
Citations
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Deep-water facies, processes and models: a review and classification scheme for modern and ancient sediments
TL;DR: A review of previous work on modern and ancient deep-water facies, processes and models is presented in this paper with a new classification scheme involving 40 distinct facies related to 15 conceptually distinct groups.
Journal ArticleDOI
Prolific deep-marine slope channels of the Nile Delta, Egypt
TL;DR: In this paper, a 3D seismic survey of the upper Pliocene slope channels of the Nile Delta offshore is presented, where the authors highlight clear phases of erosion and deposition within the upper pliocene deep-marine slope channels.
Journal ArticleDOI
Anatomy and emplacement mechanism of a large submarine slide within a Miocene foredeep in the northern Apennines, Italy: A field perspective
TL;DR: The Casaglia Monte della Colonna (CMC) body from the middle Miocene Marnoso-arenacea Formation of the Northern Apennines, covering more than 350 square kilometers, provides a rare opportunity to study the geometry and the internal deformation of a large, basinwide submarine landslide as discussed by the authors.
Journal ArticleDOI
Soft-sediment deformation within seismogenic slumps of the Dead Sea Basin
Geoffrey Ian Alsop,Shmuel Marco +1 more
TL;DR: The Late Pleistocene Lisan Formation preserved next to the Dead Sea provides exceptional 3D exposures of folds and faults generated during soft-sediment slumping and deformation.
Journal ArticleDOI
A dislocation model applied to slump structures, Ainsa Basin, South Central Pyrenees
TL;DR: In this paper, features associated with gravity-induced slumping in deepwater Eocene sediments of the Ainsa basin are described and four aspects are selected as being especially significant: extensional strain, contractional strain, strain overprinting and clastic dykes.
References
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The Analysis of Two-Dimensional Orientation Data
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The development of fold axes oblique to the regional trend
TL;DR: In this article, the origin of fold axes oblique to the regional attitude is interpreted in terms of rotation of the axes due to stretching within the axial plane of the folds.
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Structural style in slump sheets: Ludlow Series, Powys, Wales
TL;DR: In this paper, the slump deformation in sediments of the Montgomery Trough is described and compared with tectonic deformation, and the structures within each slump sheet are systematically oriented with respect to the inferred palaeoslope.