Deposits of Tide-Influenced River Deltas

Willis, Brian J.

doi:10.2110/pec.05.83.0087

Cited by 70 publications

(66 citation statements)

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“…However, sedimentation on shelves differs from that on coastal areas as the former are largely influenced by: (1) rotary tides (i.e., lacking slack-water period); (2) less distinct ebb/flood tidal cyclicity; and (3) storms, oceanic currents and other types of offshore processes (Suter, 2006). Thus, many of the diagnostic criteria for tidal sedimentation are not directly recognizable in shelf deposits Willis, 2005).…”

Section: Discussionmentioning

confidence: 99%

“…Dalrymple et al, 1990;Dalrymple & Rhodes, 1995), deltas (e.g. Willis, 2005;, bays (Boyd et al, 2008), fluvial channels (e.g. Bridges, 1985), ooid shoals (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…It has been argued that the effects of tides were much greater on Cambrian continental shelf areas, because the presumed closer position of the Moon to the Earth increased tidal forces (Hein, 1982). Also, Cambrian continental shelves were wide shallow platforms which would have amplified semi-diurnal tides (Clarke & Battisti, 1980), as well as having the potential for tidal resonance (Willis, 2005). The Gog Group, based on the dominance of unidirectional-current deposits, is interpreted to have been deposited on a tide-dominated shelf (Hein, 1982;Desjardins et al, 2011).…”

Section: Geologic Settingmentioning

confidence: 99%

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Sedimentology, Ichnology and Sequence Stratigraphy of the Lower Cambrian Gog Group, Southern Rocky Mountains, Canada

Desjardins¹

2017

Geological Society of America Abstracts With Programs

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The architecture, distribution and facies of sandstone bodies in the Gog Group of the southern Rocky Mountains of western Canada record the dynamics of sand movement on the broad continental shelf of West Laurentia during the Early Cambrian phase of worldwide transgression. This study focuses on the stratigraphy, sedimentology and ichnology in the Bow Valley region, specifically the sector from Mount Assiniboine northwest to the North Saskatchewan River. The objectives of this project were severalfold: (1) revise the existing stratigraphic nomenclature; (2) document the sedimentary facies; (3) identify facies assemblages and interpret them in terms of sedimentary processes and environments; (4) characterize sandstone body geometries; (5) develop a sequence-stratigraphic framework; (6) document trace-fossil occurrences; and (7) characterize different trace-fossil assemblages in terms of colonization trends and prevailing paleoenvironmental conditions. The Gog Group in this area has historically comprised four units, the Fort Mountain, Lake Louise, St. Piran and Peyto formations. North of Bow Pass an additional unit, the Jasper Formation, occurs below the Fort Mountain Formation and is related to accommodation created by active rift-faulting during the latest Neoproterozoic. In the Lake Louise and Lake O'Hara area, four new formal subdivisions within the St. Piran Formation are proposed: Lake O'Hara, Lake Oesa, Lake Moraine and Wiwaxy Peaks members.The sequence stratigraphy of tide-dominated setting has yet not been fully explored. The stratal architecture of the Lake O'Hara and Lake Oesa members reveals a new mechanism for the formation of the regressive surface of marine erosion landward of iii the lever point of balance between sedimentation and erosion in the subtidal environment.As the shoreline is forced to regress with falling sea level, the laterally continuous tidal flats advance and the preexisting shallow-subtidal compound dunes are scoured by strong tidal currents that carve gradually a new equilibrium profile. We argue that the accretion of intertidal flats on top of subtidal sands is an overlooked yet predictable component of falling-stage systems tracts in tide-dominated settings.The Gog Group also offers an opportunity to explore animal-sediment relationships in a high-energy setting, during the early phase of Phanerozoic diversification. The presence of constrasting ichnofabrics within a single Early Cambrian sand-sheet complex illuminates how the colonisation trends of suspension and detritus feeders were controlled by factors specific to the various subenvironments.The variety of sandbody types in the Gog Group reflects varying sediment supply and location on the inner continental shelf. Five types of compound cross-stratified sandstone are distinguished based on foreset geometry, sedimentary structures and internal heterogeneity. These represent five broad categories of subtidal sandbodies: (1) compound-dune fields; (2) sand sheets; (3) sand ridges; and (4) patchy dunes. Tracefossil dis...

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Section: Discussionmentioning

confidence: 99%

“…Dalrymple et al, 1990;Dalrymple & Rhodes, 1995), deltas (e.g. Willis, 2005;, bays (Boyd et al, 2008), fluvial channels (e.g. Bridges, 1985), ooid shoals (e.g.…”

Section: Discussionmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

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Sedimentology, Ichnology and Sequence Stratigraphy of the Lower Cambrian Gog Group, Southern Rocky Mountains, Canada

Desjardins¹

2017

Geological Society of America Abstracts With Programs

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“…Figure 13: (A) representation of morphometric parameters of a tidal sand ridge, intended as geomorphic element (relief, length and width) and architectural element (thickness, length and width); modified after: Houbolt et al (1968); Stride et al (1982); Willis (2005). (B) Range plot of minimum to maximum tidal-sand-ridge length versus mean vertical relief (sand-ridge height) for different subsets associated with the different case-study examples of Off (1963) in green, and for more recent published datasets, in red; the length is referred to the direction of elongation of the geomorphic or architectural element, which may be at an angle to the regional dip direction and/or with the shoreline.…”

Section: Id Case Studymentioning

confidence: 99%

The Shallow-Marine Architecture Knowledge Store: A database for the characterization of shallow-marine and paralic depositional systems

Colombera

Mountney

Hodgson

et al. 2016

Marine and Petroleum Geology

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The Shallow-Marine Architecture Knowledge Store (SMAKS) is a relational database devised for the storage of hard and soft data on the sedimentary architecture of ancient shallow-marine and paralic siliciclastic successions, and on the geomorphological organization of corresponding modern environments. The database allows incorporation of data from the published literature, which are uploaded to a common standard to ensure consistency in data definition. The database incorporates data on geological entities of varied nature and scale (i.e., surfaces, depositional tracts, architectural elements, sequence stratigraphic units, facies units, geomorphic elements), including attributes that characterize their type, geometry, spatial relations, hierarchical relations, and temporal significance. Furthermore, geological entities are assigned to depositional systems, or to parts thereof, that can be classified on multiple parameters (e.g., shelf width, delta catchment area) tied to metadata (e.g., data types, data sources).The SMAKS permits the quantitative characterization of modern and ancient shallow-marine and paralic clastic depositional systems. It aims to serves as a repository of analogue information for hydrocarbon-bearing successions, and as a research tool, applicable to aid the development of facies models or to assess the sensitivity of depositional systems to particular controlling factors, for example.To demonstrate the wide applicability of the database in fields of both fundamental and applied research, example database output is presented that (i) includes data from wave-, tide-, and fluvial-dominated shallow seas and sedimentary successions, and (ii) covers a wide depositional spectrum, from backshore to shelf-edge settings. The examples include information on the facies organization of different types of paralic sub-environments, on the hierarchical arrangement of architectural elements that form deltaic constructional units in Quaternary deltas, on the morphometry of modern and Quaternary tidal sand ridges, and on the geometry of parasequence-scale nearshore sandstone belts from the Upper Cretaceous of the Western Interior Seaway in Utah (USA).

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“…From small to large lengthscales, this hierarchy consists of mouth bars, mouth-bar assemblages, and delta lobes (Bhattacharya, 2006; equivalent to the jet-plume deposits, jet-plume-complex deposits, and delta lobes of Wellner et al, 2005). Sediment-body geometry is modified by the action of waves and tides, which respectively tend to result in shoreline-parallel and shorelineperpendicular sediment transport that suppresses branching and switching of distributary channels (e.g., Galloway, 1975;Willis, 2005;Bhattacharya, 2006;Plink-Björklund, 2012). Clinoforms exist as a preserved record of sediment-body morphologies at each of these hierarchical lengthscales (e.g., Gani and Bhattacharya, 2007) but are most commonly described at the scale of delta lobes in outcrop and high-resolution, shallow seismic data.…”

Section: Conceptual Framework For Clinoform Modelingmentioning

confidence: 99%

Three-dimensional modeling of clinoforms in shallow-marine reservoirs: Part 1. Concepts and application

Graham¹,

Jackson²,

Hampson³

2015

Bulletin

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Deposits of Tide-Influenced River Deltas

Cited by 70 publications

References 0 publications

Sedimentology, Ichnology and Sequence Stratigraphy of the Lower Cambrian Gog Group, Southern Rocky Mountains, Canada

Sedimentology, Ichnology and Sequence Stratigraphy of the Lower Cambrian Gog Group, Southern Rocky Mountains, Canada

The Shallow-Marine Architecture Knowledge Store: A database for the characterization of shallow-marine and paralic depositional systems

Three-dimensional modeling of clinoforms in shallow-marine reservoirs: Part 1. Concepts and application

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