Shallow-Marine Tidal Deposits

Reynaud, Jean‐Yves; Dalrymple, Robert W.

doi:10.1007/978-94-007-0123-6_13

Cited by 77 publications

(92 citation statements)

References 114 publications

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“…Herringbone cross-lamination points to tidally influenced deposition (tidal flats -Reineck & Singh 1973). A mudflat and mixed-flat depositional environment is supposed for a part of the FA3 (FitzGerald et al 2012;Reynand & Dalrymple 2012). The FA4 is interpreted as deposits of the lower shoreface and the transitional zone to the inner shelf (Duke 1985;Duke et al 1991).…”

Section: Discussionmentioning

confidence: 99%

Evolution of the passive margin of the peripheral foreland basin: an example from the Lower Miocene Carpathian Foredeep (Czech Republic)

Francírek¹,

Nehyba²

2016

Geologica Carpathica

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Abstract:The Karpatian deposits of the central part of the Carpathian Foredeep in Moravia, which are deeply buried under the Outer Western Carpathians, provide a unique opportunity to reconstruct the former evolutionary stages of this peripheral foreland basin and its paleogeography. A succession of three depositional units characterized by a distinct depositional environment, provenance, and partly also foreland basin depozone, have been identified. The first depositional unit represents a proximal forebulge depozone and consists of lagoon-estuary and barred coastline deposits. The source from the "local" crystalline basement played here an important role. The second depositional unit consists of coastline to shallow marine deposits and is interpreted as a forebulge depozone. Tidalites recognized within this unit represent the only described tide-generated deposits of the Neogene infill of the Carpathian Foredeep basin in Moravia. The source from the basin passive margin (the Bohemian Massif) has been proved. The third depositional unit is formed by offshore deposits and represents a foredeep depozone. The provenance from both passive and active basin margin (Silesian Unit of the Western Carpathian Flysch Zone) has been proved. Thus, both a stepwise migration of the foredeep basin axis and shift of basin depozones outwards/cratonwards were documented, together with forebulge retreat. The shift of the foreland basin depozones more than 50 km cratonward can be assumed. The renewed thrusting along the basin's active margin finally completely changed the basin shape and paleogeography. The upper part of the infill was deformed outside the prograding thrust front of flysch nappes and the flysch rocks together with a strip of Miocene sediments were superposed onto the inner part of the basin. The width and bathymetric gradient of the entire basin was changed/reduced and the deposition continued toward the platform. The basin evolution and changes in its geometry are interpreted as a consequence of the phases of the thrust-sheet stacking and sediment loading in combination with sealevel change.

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Section: Discussionmentioning

confidence: 99%

Evolution of the passive margin of the peripheral foreland basin: an example from the Lower Miocene Carpathian Foredeep (Czech Republic)

Francírek¹,

Nehyba²

2016

Geologica Carpathica

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“…These data have been particularly useful because they demonstrate that even areas considered to be bedrock may have a high percentage cover of bouldery gravel. In the following description of bedforms the scheme of Ashley (1990) is used, along with further clarifications of Dalrymple and Rhodes (1995) and Reynaud and Dalrymple (2011).…”

Section: Other Data Sourcesmentioning

confidence: 99%

Anatomy of the tidal scour system at Minas Passage, Bay of Fundy, Canada

Shaw

Todd

2012

Marine Geology

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“…Moreover, if most of the superficial morphologies of ridges appear to be in equilibrium with the present-day hydrodynamic regime, the timescales of the processes responsible for the formation and evolution of these large bedforms are of the same order as the duration of a high frequency sea-level cycle and most of them are transgressive features (Reynaud and Dalrymple, 2012;Reynaud et al, 2003). Furthermore, physical models have shown the interplay of the substratum with the presence of a small bed perturbation during ridge initiation (Huthnance, 1973(Huthnance, , 1982a(Huthnance, , 1982b.…”

Section: Introductionmentioning

confidence: 97%

Long term evolution and internal architecture of a high-energy banner ridge from seismic survey of Banc du Four (Western Brittany, France)

et al. 2015

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International audienceThe recent completion of a coupled seismic and swath bathymetric survey, conducted across the sand ridge system of the Banc du Four located on the Atlantic continental shelf of Brittany (Mer d’Iroise, France), provided new data for the study of the long term evolution of deep tidal sand ridges. Five seismic units are distinguished within the ridge, separated by pronounced major bounding surfaces. The basal unit is interpreted to be shoreface deposits forming the core of the ridge. It is overlaid by a succession of marine sand dunes fields forming the upper units. Sandwave climbing, which combines progradation and accretion, is the major process controlling the growth of the ridge. The elevation of the preserved dune foresets reaches values of about 20–30 m within the ridge. The foresets indicate a combination of giant dunes characterized by numerous steep (up to 20°) clinoforms corresponding to a high-energy depositional environment. Moreover, the presence of scour pits linked to the 3D geometries of giant dunes allow the growth of bedforms migrating oblique to the orientation of giant dune crest lines. All of the radiocarbon ages of the biogenic surficial deposits of the Banc du Four range from 10,036 to 2748 cal years B.P. and suggest the Banc du Four has grown during the last sea-level rise. The apparent absence of recent surface deposits could be caused by a change in benthic biogenic productivity or the non-conservation of recent deposits. In contrast, the presence of relatively old sands at the top of the ridge could be explained by the reworking and leakage of the lower units that outcrop locally at the seabed across the ridge. Moreover, the long-term evolution of the ridge appears strongly controlled by the morphology of the igneous basement. The multiphase accretion of the ridge is closely linked to the presence of a residual tidal current eddy, consecutive with the progressive flooding of the coastal promontories and straits that structured the igneous basement.Therefore, the Banc du Four should be thought of as a representative example of a large-scale high-energy banner bank

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Shallow-Marine Tidal Deposits

Cited by 77 publications

References 114 publications

Evolution of the passive margin of the peripheral foreland basin: an example from the Lower Miocene Carpathian Foredeep (Czech Republic)

Evolution of the passive margin of the peripheral foreland basin: an example from the Lower Miocene Carpathian Foredeep (Czech Republic)

Anatomy of the tidal scour system at Minas Passage, Bay of Fundy, Canada

Long term evolution and internal architecture of a high-energy banner ridge from seismic survey of Banc du Four (Western Brittany, France)

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