کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4689290 | 1636046 | 2015 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Progradational patterns at the head of single units of base-of-slope, submarine granular flow deposits (“Conglomérats des Gâs”, Coniacian, SE France)
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
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چکیده انگلیسی
This study deals only with the first system which comprises, in stratigraphic order, classical sandstone turbidites, clast-supported conglomerates, and coarse-grained, cross-bedded, sandy calcarenites. The transition between the last two lithologies is progressive, allowing the mechanisms, responsible for apparent lateral accretions found pervasively in both the conglomerates and the calcarenites, to be understood. Here, cross-bedding is not the result of changes in the direction of accretion in “lateral bars” or in oblique infillings of sinuous channels, as is often suggested in other similar deep-water carbonate systems. Each event bed comprises a prograding conglomeratic head plug, blanketed in continuous sedimentation by forward spreading bioclastic calcarenites. The superimposition of such mixed beds gives rise to a low-angle cross-stratification, an unusual feature for a system interpreted as a base-of-slope apron. Conglomerates were probably deposited through a granular flow mechanism at a strong hydraulic jump at the base of the slope. Associated calcarenites show supercritical flow features. The undulating transverse architecture of its large head onlapping the paleoslope suggests it is a multi-apex apron. The sandstone-conglomerate-calcarenite succession of the depositional sequence is interpreted as overall transgressive after the late Turonian tectonic phase that led to the exposure of the Vercors carbonate platform updip.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sedimentary Geology - Volume 317, 15 March 2015, Pages 102-115
Journal: Sedimentary Geology - Volume 317, 15 March 2015, Pages 102-115
نویسندگان
Danièle Grosheny, Serge Ferry, Thomas Courjault,