... and lower-frequency third-order accommodation cycles. We used a two-dimensional forward computer simulation to compare allocyclic and autocyclic models for high-frequency cycles. The allocyclic simulation superimposes a deterministic, Milankovitch glacio-eustatic driver on a lower-frequency, third-order...

...-frequency cycles, be it an autocyclic or allocyclic mechanism. This approach has major implications for the use of high-frequency, fourth- and fifth-order cycle characteristics to identify third-order cycles in outcrops and cores of shallow-water carbonates, where stratigraphic control may be less than...

...Peter M. Burgess Abstract Recent carbonate sequence stratigraphic models suggest that the degree of order present in successions of carbonate parasequences is determined by temporal variations in eustatic amplitude and by varying levels of autocyclicity. Ordered parasequence stacking is suggested...

... (autocyclic) variability of sediment transport ( Jerolmack and Paola, 2010 ). Although the subcritical flow regime (Froude number less than 1) of the simulations presented here precludes autocyclic behavior, self-propagating cyclic steps and associated autogenic sediment outflux cycles are observed with our...

... of the processes related to infilling of interdistributary bays. Six vertically stacked heterolithic to sand-prone bayfill units are identified. A distinction is made between bayfill units and bayfill successions, based on their bounding autocyclic or allocyclic flooding surfaces. Units are bounded by high...

... to the possibility that internal sedimentary processes, i.e., autocyclic processes ( Ginsburg 1971 ; Satterley 1996 ) and tectonic activity ( Hardie et al. 1986 ) overwhelm, and possibly mimic, Milankovitch-driven eustatic and climatic forcing. The Ginsburg autocycle mechanism especially is still often regarded...

... of the geological record but debate continues about what processes lead to their formation. Three conceptual models, or a combination thereof, are commonly invoked to explain cycle formation; eustasy, tectonics, or autocyclicity. These three models are tested with a large new dataset from different Early Jurassic...

... sedimentary logs along a 27-km outcrop transect, in combination with 2 cored wells and log data from 86 wells, enables detailed mapping of both the lateral and vertical distribution of facies associations. Autocyclic processes are typically represented by surfaces indicative of deepening events of local...

... or autocyclic processes. Note that we consider only flow deposits with a thickness of 1 mm or greater, because anything thinner is unlikely to ever be practically measurable from outcrop analysis. Spectral analysis involved computing the power spectrum from the observed vertical succession using the method...

... sequences reflects a complex and dynamic interplay of both autocyclic and allocyclic factors. An appreciation of the relative importance of the factors which have controlled the cyclicity is important for the description and modeling of shale and sandstone geometries. The computer simulation models...

...Salim Belkhedim; Emilia Jarochowska; Miloud Benhamou; Abdelkrim Nemra; Radouane Sadji; Axel Munnecke Abstract Meter-scale shallowing-upward cycles are recorded in many carbonate successions around the world. It is often difficult to recognize whether they represent autocycles, formed through...

.... A useful early examination of this problem was carried out by Beerbower (1964), who divided alluvial sedimentary controls into allocyclic and autocyclic mechanisms: Allocyclic controls: variations in discharge, load and slope, which originate outside the sedimentary basin ultimately through tectonic...

... paradigm ( Goldhammer et al., 1990 ; Chen et al., 2001 ; Raspini, 2001 ), and alternative mechanisms of sequence generation are only rarely considered ( Burgess and Allen, 1996 ). Goldhammer et al. (1993) considered production of parasequences by autocyclic processes in a numerical model...

... the environment (allocyclicity), intra-feedback mechanisms inside the environment (autocyclicity), or some combination. Though the examples cited above fall under the category of allocyclicity, recent growth in experimental stratigraphy and geomorphology has raised awareness of autocyclicity specific to a given...

... for bioturbation indices in ancient upper-foreshore and backshore deposits. Bioturbation in foreshore and backshore successions provides a means for predicting short-term, autocyclic processes in the rock record, in that: (1) the initial occurrence of burrowing marks the transition from the foreshore...

... channel-belt complexes. Controls on channel and channel-belt migration or avulsion are considered to be related to autocyclic processes. In contrast, large-scale vertical evolution and grain-size variations record allocyclic signals. In particular, gradual grain-size variations suggest a climatic control...

... 2013 GULF PETROLINK CC BY-NC. All rights reserved 2013 GULF PETROLINK CC BY-NC Figure 3: Galloway motif construction with eight indicated seismic horizon boundaries. Red arrows indicate autocyclic regression packages and green arrows indicate autocyclic transgressive packages. Black...

...Nicoletta Leonardi; Sergio Fagherazzi Abstract We present high-resolution field measurements of five sites along the United States Atlantic Coast, and cellular automata simulations, to investigate the erosion of marsh boundaries by wave action. According to our analysis, when salt marshes...

... and autocyclicity. Many researchers recognize a strong climatic/eustatic control for the deposition of sediment gravity flow (SGF) deposits and submarine-fan development in ocean basins, e.g . , for the Amazon Fan ( Manley and Flood 1988 ; Flood and Piper 1997 ; Maslin et al. 2006 ), Mississippi Fan ( Bouma...

... of the western Mediterranean region all are found to be of similar scale, facies and cycle type. Likely common origins are through Milankovitch band allocyclicity, or autocyclic tidal flat progradation superimposed on regional subsidence. Within the Gibraltar Limestone high‐frequency cycles are superimposed...