Fluvio-tidal transition zone: Terminology, sedimentological and ichnological characteristics, and significance

Shchepetkina, Alina; Gingras, Murray K.; Mángano, M. Gabriela; Buatois, Luís A.

doi:10.1016/j.earscirev.2019.03.001

Cited by 27 publications

(12 citation statements)

References 97 publications

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“…The only observations that can help in discriminating different tidal facies and determining their distribution over environmental gradients (i.e., distance from the riverine input) are the diversity and abundance of sedimentary structures and ichnofossil assemblages. Both have been largely used over the years for this very purpose, with excellent results (e.g., Fiah & Lambiase, 2014;Melnyk & Gingras, 2019). In this study, the fine alternation of sandy to clayey deposits testifies to the presence of three different facies: tidal channels (FA4), tidal flats (which can be muddy or sandy) (FA5) and tidal bars (FA6).…”

Section: Tide-dominated Environmentsmentioning

confidence: 79%

Palaeoenvironmental Interpretation Of Late Miocene Outcrops (Miri And Seria Formations) Along Jalan Tutong In Brunei Darussalam

Roslim¹,

Briguglio²,

Kocsis³

et al. 2020

BGSM

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Eleven Neogene outcrops (seven of the Miri Formation and four of the Seria Formation) from Brunei Darussalam are described. Detailed stratigraphic columns are presented with special emphasis on the sedimentary sequences, providing insights into the depositional environments. The rocks are comprised mostly of sandstone, claystone and a mix of both lithologies, and are piled up in cycles of coarsening upward successions, which are here interpreted as parasequences. Most sections are characterized by abundant and diverse sedimentary structures, reworked fossiliferous deposits and organic fragments such as ambers and wood remains. Certain beds are rich in fossils: among the macrofossils, the most common are bivalves, gastropods and followed by fish remains (teeth and otholiths), crustaceans, corals and echninoderms, which are abundant at specific locations. Among the microfossils, the most common are foraminifera, which are mostly dominated by either rotaliids or textulariids; the most common genera are Ammonia, Elphidium and Trochammina. Porcelaneous and planktonic foraminifera are rare. Ostracods are also found. Ichnofossils are quite abundant in all sections but are represented mostly by Ophiomorpha and Thalassinoides. In view of the observations, the sections are interpreted as evidence of shallow-marine conditions, in which wave, fluvial and tidal actions strongly influenced the depositional environment. In a few cases, deposition of sediment seems to reflect the transition from wave-dominated to tide-dominated conditions. Our findings indicate that in such shallow marine deposits, the interpretation of sediment type and sedimentary structures alone cannot indicate one specific sedimentary environment, but such observations should include palaeontological evidence to generate more accurate palaeoenvironmental reconstructions. Lastly, our results are discussed in relation to the sedimentary evolution of the region.

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Section: Tide-dominated Environmentsmentioning

confidence: 79%

Palaeoenvironmental Interpretation Of Late Miocene Outcrops (Miri And Seria Formations) Along Jalan Tutong In Brunei Darussalam

Roslim¹,

Briguglio²,

Kocsis³

et al. 2020

BGSM

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“…Longhitano et al ., ) because of absence of tidal flats, and it is commonly difficult to make the tidal argument in the La Jardinera fluvial to marine transition zone (cf. Dalrymple & Choi, ; Shchepetkina et al ., ). Therefore, instead of being assertive or dogmatic, tidal signals are rather proposed here as a hypothesis and interpreted to occur predominantly in the interdistributary lower delta‐plain to upper delta front deposits, based on the following evidence:…”

Section: Sedimentological Results and Interpretationsmentioning

confidence: 97%

River‐dominated and tide‐influenced shelf‐edge delta systems: Coarse‐grained deltas straddling the Early–Middle Jurassic shelf–slope break and transforming downslope, Lajas–Los Molles formations, Neuquén Basin, Argentina

et al. 2020

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The three‐dimensional facies and architecture variability of shelf‐edge deltaic units cropping out at the transition between the Lower–Middle Jurassic Lajas and Los Molles formations of southern Neuquén Basin, Argentina, is presented here, as well as their stratigraphic relationship to uppermost deep‐water slope channel systems. Deep‐water, slope mudstones with thin turbidite beds merge upward with prodelta mudstones and thin sandstones, which are truncated by delta‐front to mouth‐bar sandstones. The latter sandstones are then downcut by large‐scale, trough cross‐stratified coarse‐grained sandstones and conglomerates of distributary channel systems and along‐strike, amalgamated with cross‐bedded sandy units showing evidence of tidal reworking. Proximal–distal facies and architecture variability within a shelf‐edge deltaic succession demonstrates that distributary channel‐complexes become wider and deeper basinward, forming channelized river‐dominated distributary fairways separated by tidally reworked inter‐distributary sand belts at the shelf edge. Evidence from depositional‐dip oriented outcrops shows a lack of collapsed and slumped strata at the shelf edge, and that the coarse shelf‐edge distributary channel fills continue far down the deepwater slope, and conglomerates transform to become high‐density turbidites to mainly thick‐bedded, sand‐matrix‐supported debrites. The interplay between flood tides and river currents is interpreted to have primarily modulated the focusing of river drainages, and consequently coarse‐grained sediment transport, along preferential routes on the outer‐shelf to shelf‐edge and down onto the slope. This contribution documents a unique example of coarse‐grained (mostly conglomeratic) shelf‐edge delta systems, tying bed‐scale facies and architecture data to a seismic‐scale shelf‐margin morphology, thus providing outcrop analogue data for the characterization of shelf‐edge delta systems in the subsurface.

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“…However, these sedimentary structures have also been reported from numerous ancient lacustrine settings where they can form by flashy fluvial discharge along shorelines and into the littoral zones of lakes as fluvial flow competency decreases via dissipation and flow expansion and via interactions with waves (e.g. Greenwood and Sherman, 1986;Ilgar and Nemec, 2005;Smith et al, 2015;Andrews and Hartley, 2015;O'Connell et al, 2017;Bright et al, 2018;Dorsey et al, 2018;Shchepetkina et al, 2019). In contrast to the discrete intervals in which such rippled facies are reported in lacustrine strata (op.…”

Section: Features Indicative Of Periodically Reversing or Flashy (Frementioning

confidence: 97%

A marine origin for the late Mesoproterozoic Copper Harbor and Nonesuch Formations of the Midcontinent Rift of Laurentia

Jones

Prave

Raub

et al. 2020

Precambrian Research

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The c. 1.1 Ga Copper Harbor and Nonesuch formations of the Keweenawan Supergroup exposed along the Canadian-United States shorelines of Lake Superior are part of the surface exposures of the Laurentian Midcontinent Rift. These units have long been considered non-marine in origin and have figured prominently in ideas regarding the evolution of microbial life and the redox conditions of Earth's ocean-atmosphere system at the close of Mesoproterozoic time. However, these rocks also host hydrothermal metal deposits, the emplacement of which may have compromised primary geochemical signals that are used to underpin those ideas. Here we highlight new sedimentological observations to provide an independent framework for assessing the depositional setting and geochemistry of those strata. We show that the totality of sedimentological features leads to the conclusion that parts of the upper Copper Harbor Formation and the entirety of the Nonesuch Formation were deposited along tide-and waveinfluenced shorelines and in shallow-marine settings under evaporitic conditions. Evidence for this interpretation includes the abundance of flaser, wavy, linsen and pinstripe bedding, ubiquity of reactivation surfaces and mud drapes associated with all ripple forms, superposed sets of ripple cross-lamination showing bimodal (herring-bone) sediment transport directions, desiccation cracks and metre-scale hummocky cross-stratification. Further, evaporite fabrics and pseudomorphs after gypsum in the upper 200 m of the Copper Harbor Formation and in numerous stratigraphic positions within the Nonesuch Formation indicate that the water body was saline, not fresh. The emerging palaeogeographic image is one of a large, shallow-marine embayment with fringing sabkha-like shorelines. Ideas about late Mesoproterozoic biospheric evolution and Earth's surface redox and oxygenation that rely on the Nonesuch Formation and Copper Harbor stromatolites having been deposited within a lacustrine setting require reassessment.

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Fluvio-tidal transition zone: Terminology, sedimentological and ichnological characteristics, and significance

Cited by 27 publications

References 97 publications

Palaeoenvironmental Interpretation Of Late Miocene Outcrops (Miri And Seria Formations) Along Jalan Tutong In Brunei Darussalam

Palaeoenvironmental Interpretation Of Late Miocene Outcrops (Miri And Seria Formations) Along Jalan Tutong In Brunei Darussalam

River‐dominated and tide‐influenced shelf‐edge delta systems: Coarse‐grained deltas straddling the Early–Middle Jurassic shelf–slope break and transforming downslope, Lajas–Los Molles formations, Neuquén Basin, Argentina

A marine origin for the late Mesoproterozoic Copper Harbor and Nonesuch Formations of the Midcontinent Rift of Laurentia

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