کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4688970 1636019 2016 26 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Convolute laminations and load structures in turbidites as indicators of flow reflections and decelerations against bounding slopes. Examples from the Marnoso-arenacea Formation (northern Italy) and Annot Sandstones (south eastern France)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Convolute laminations and load structures in turbidites as indicators of flow reflections and decelerations against bounding slopes. Examples from the Marnoso-arenacea Formation (northern Italy) and Annot Sandstones (south eastern France)
چکیده انگلیسی


• The significance of convolute laminations and load structures in turbidites has been discussed.
• Convolute laminae are related to flow reflections against bounding slopes.
• Basal load casts are related to decelerations of high-density flows against bounding slopes.
• Contained-reflected beds and convolute laminae increase consistently with synsedimentary-structural uplifts.
• Lateral–vertical distribution of these soft-sediment deformations depends on basin morphology.

This work discusses the significance of particular types of soft-sediment deformations very common within turbidite deposits, namely convolute laminations and load structures.Detailed facies analyses of the foredeep turbidites in the Marnoso-arenacea Formation (northern Italy) and Annot Sandstones (south eastern France) show that these deformational structures tend to increase near morphological obstacles, concomitantly with contained-reflected beds. The lateral and vertical distribution of convolute laminae and load structures, as well as their geometry, has a well-defined depositional logic related to flow decelerations and reflections against bounding slopes. This evidence suggests an interaction between fine-grained sediment and the presence of morphologic relief, and impulsive and cyclic-wave loadings, which are produced by flow impacts or reflected bores and internal waves related to impinging bipartite turbidity currents.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sedimentary Geology - Volume 344, October 2016, Pages 382–407
نویسندگان
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