Sedimentology

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Wave‐generated structures and sequences from a shallow marine succession, Lower Carboniferous, County Cork, Ireland
Sedimentology - Tập 24 Số 4 - Trang 451-483 - 1977
Johan Ferdinand Maurits De Raaf, J. R. Boersma, A. van Gelder
ABSTRACTIn a Lower Carboniferous formation south of Cork, Ireland, characterized by sand/mud alternations at varying scales, several lithotypes could be singled out on the basis of relative sand content and primary sedimentary structures. The lithotypes are arranged in several types of sequences: coarsening upwards, coarsening‐fining upwards, random, and in rare in...... hiện toàn bộ
Experimental soft‐sediment deformation: structures formed by the liquefaction of unconsolidated sands and some ancient examples
Sedimentology - Tập 43 Số 2 - Trang 279-293 - 1996
Geraint Owen
ABSTRACTThe effects of liquefaction in saturated sand bodies under a variety of driving forces are described from shaking table experiments, and structures from the geological record are presented which are analogous to the experimental structures. The collapse of sloping heaps of cross‐bedded sand under a gravitational body force generates low‐angle, essentially u...... hiện toàn bộ
Colluvial sedimentation in a hyperarid setting (Atacama Desert, northern Chile): Geomorphic controls and stratigraphic facies variability
Sedimentology - Tập 60 Số 5 - Trang 1257-1290 - 2013
Dario Ventra, Guillermo Chong Dı́az, Poppe L. de Boer
AbstractResearch on colluvial depositional systems has recently emphasized periglacial and high‐altitude settings, and the relations between Quaternary slope stratigraphy and climate change. This article examines the role of variable slope morphology, surface hydrology and microclimate in controlling colluvial sedimentation along a coastal tract of the hyperarid At...... hiện toàn bộ
Variations in shoreface progradation and ravinement along the Texas coast, Gulf of Mexico
Sedimentology - Tập 48 Số 4 - Trang 837-853 - 2001
Antonio B. Rodriguez, Michelle L. Fassell, John B. Anderson
Shoreface architecture, evolution (mid‐Holocene to present) and depths of transgressive ravinement were examined from Sabine Pass, at the Texas–Louisiana border, to South Padre Island, near the Texas–Mexico border, using 30 shoreface transects. Shoreface transects extend out to 16‐m water depth, each created from an echo‐sounding profile and, on average, seven sediment cores. The shoreface...... hiện toàn bộ
Water escape structures in coarse‐grained sediments
Sedimentology - Tập 22 Số 2 - Trang 157-204 - 1975
Donald R. Lowe
ABSTRACTThree processes of water escape characterize the consolidation of silt‐, sand‐and gravel‐sized sediments. Seepage involves the slow upward movement of pore fluids within existing voids or rapid flow within compact and confined sediments. Liquefaction is marked by the sudden breakdown of a metastable, loosely packed grain framework, the grains becoming tempo...... hiện toàn bộ
A new aeolian sand trap design
Sedimentology - Tập 25 Số 2 - Trang 303-306 - 1978
Stephen P. Leatherman
ABSTRACTA vertical rod sand trap has been constructed to acquire a volumetric measure of wind‐blown sand. The design is simple, construction cost is minimal, and collection efficiency is quite high. This device can be used effectively for short‐term monitoring of aeolian transport.
Overbank sedimentation rates in former channel lakes: characterization and control factors
Sedimentology - Tập 56 Số 2 - Trang 461-482 - 2009
A. Citterio, Hervé Piégay
AbstractOverbank sedimentation rates were studied in former channels of three rivers in south‐eastern France. Depth and spatial distribution of sediment, as well as geometry, hydrological connectivity and age of 39 lakes, were both measured and calculated. The mean sedimentation rate of lakes varied between 0 and 2·57 cm year−1. Sedimentation r...... hiện toàn bộ
The ability of debris, heavily freighted with coarse clastic materials, to flow on gentle slopes
Sedimentology - Tập 23 Số 2 - Trang 213-234 - 1976
JAMES D. RODINE, Arvid M. Johnson
ABSTRACTObservations of many debris‐flow deposits on gently‐sloping alluvial fans have disclosed that debris commonly is heavily loaded with coarse clastic material and contains large isolated blocks. The paper describes how debris charged with coarse granular material can transport large blocks, yet flow on gentle slopes.Experimental results of mi...... hiện toàn bộ
Flow transformations in slumps: a case study from the Waitemata Basin, New Zealand
Sedimentology - Tập 55 Số 5 - Trang 1311-1332 - 2008
Lorna J. Strachan
AbstractThe process by which slumps transform into other flow types is an understudied phenomenon; generally, sedimentologists have assumed that this is how many debris flows and turbidity currents form, yet there is a paucity of information relating to the specific processes involved. This paper aims to redress this imbalance and investigates the processes of slum...... hiện toàn bộ
The Saharan debris flow: an insight into the mechanics of long runout submarine debris flows
Sedimentology - Tập 46 Số 2 - Trang 317-335 - 1999
Gee, Masson, Allen
New 3·5 kHz profiles and a series of piston cores from the north‐west African margin provide evidence that the Saharan debris flow travelled for more than 400 km on a highly fluid, low‐friction layer of poorly sorted sediment. Data suggest that the Saharan debris flow is a two‐phase event, consisting of a basal, volcaniclastic debris flow phase overlain by a pelagic debris flow phase. Both...... hiện toàn bộ
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