Architecture and controls of thick, intensely bioturbated, storm-influenced shallow-marine successions: An example from the Jurassic Neuquén Basin (Argentina)

Schwarz, Ernesto; Poyatos‐Moré, Miquel; Boya, Salvador; Gomis‐Cartesio, Luz E.; Midtkandal, Ivar

doi:10.1016/j.palaeo.2020.110109

Cited by 5 publications

(4 citation statements)

References 42 publications

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“…Diagnostic structures, such as hummocky cross‐stratification and upward‐fining truncated laminae suggest deposition under combined‐flow erosion and traction transport followed by suspended load to suspension settling from waning currents, as documented elsewhere for storm‐dominated deposits (Nummedal & Swift, 1987; Arnott & Southard, 1990; Lazar et al ., 2015b; Grundvåg et al ., 2021; Schwarz et al ., 2021). The relative increase in Ni content suggests a sediment supply mainly from the Po River (Amorosi et al ., 2022).…”

Section: Resultsmentioning

confidence: 99%

“…Along‐strike facies development tends to be less predictable than facies relations reconstructed along‐dip, as has been well‐illustrated from deltaic (Bhattacharya & Walker, 1991; Bhattacharya, 2006; Olariu & Bhattacharya, 2006; Gani & Bhattacharya, 2007; Li et al ., 2015; Rossi et al ., 2017; Peng et al ., 2022), shoreface (Rodriguez et al ., 2004; Isla et al ., 2023), shallow‐marine (Eide et al ., 2018; Isla et al ., 2018; Schwarz et al ., 2018) and fluvial (Rittersbacher et al ., 2014) successions, as well as from other depositional settings (Poyatos‐Moré et al ., 2019; Schwarz et al ., 2021; Li & Schieber, 2022).…”

Section: Discussionmentioning

confidence: 99%

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On depositional processes governing along‐strike facies variations of fine‐grained deposits: Unlocking the Little Ice Age subaqueous clinothems on the Adriatic shelf

Pellegrini,

Sammartino,

Schieber

et al. 2023

Sedimentology

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Depositional processes recorded by shelf deposits may vary widely along‐strike, depending largely on the mode of delivery and deposition of sediments to the basin. In fine‐grained systems in particular, depositional processes are difficult to reconstruct with standard facies analysis of sediment cores due to the ostensibly featureless and homogenous appearance of muds. In this study, sedimentological, palaeontological, geochemical and oceanographic data were combined in a detailed characterization of depositional conditions via sedimentary structures, type of organic matter, trace‐metal geochemistry and benthic fauna assemblages (foraminifera and ostracods) along the 600 km long shelf delta clinothems of the West Adriatic shelf (Italy). Processes inferred from sedimentary facies and micro‐structures were then considered in the context of the modern Adriatic oceanographic regime. Specific attention was given to the Little Ice Age stratigraphic unit (1500–1850 CE), which contains a continuum of genetically related fine‐grained strata. The Little Ice Age deposit offers the opportunity to examine a source‐to‐sink system with the high resolution typical of modernanalogues, at a time interval when Apennine rivers were not yet hydraulically engineered with man‐made sediment traps along their trunks. Individual beds within the Little Ice Age muddy prodelta form hectometre to kilometre‐wide bedsets that reflect the interplay between energetic meteo‐ocean conditions (storm‐dominated beds), flood supply (river‐dominated beds or hyperpycnites) and along‐shelf bottom‐current dispersion (drift‐dominated beds). The multidisciplinary approach applied at different scales of observations helped in understanding sediment provenance and the relative timing of sediment transport before final burial that strongly promoted organic matter oxygen exposure and the loss of carbon by microbial degradation. Overall, the distinctive depositional processes that acted in concert along the prodelta slope produced a subtle lateral heterogeneity of preserved sedimentary structures, faunal associations and organic matter composition in a laterally‐continuous lithostratigraphic unit deposited at centennial scale. These findings have implications on the forcing conditions that ultimately control the location and nature of fine‐grained beds in both modern and ancient, mud‐dominated depositional systems.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

On depositional processes governing along‐strike facies variations of fine‐grained deposits: Unlocking the Little Ice Age subaqueous clinothems on the Adriatic shelf

Pellegrini,

Sammartino,

Schieber

et al. 2023

Sedimentology

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“…Ver ti cal biogenic struc tures are com monly con sid ered as ev i dence of rapid de po si tion due to storms (Savrda and Nanson, 2003;Bhattacharya et al, 2004;Mag yar et al, 2006;Buatois and Mángano, 2009;Liu et al, 2012;Üner, 2018;Schwarz et al, 2021). Fairly rare nar row and short es cape struc tures oc cur in the sandy and silty de pos its (sec tion 3), whereas rel a tively closely-spaced, thick and long struc tures occur in the coarse-grained de pos its (sec tion 2).…”

Section: Discussion Sedimentary Modelmentioning

confidence: 99%

First record of tempestites from Quaternary lacustrine deposits in the Ağrı Basin (Eastern Anatolia, Türkiye): palaeoclimatological and palaeogeographic implications

Üner

2023

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Several event layers have been identified in lacustrine deposits in the AErI Basin of Anatolia (E Türkiye). Sedimentological and palaeontological data newly indicate a storm-induced origin for some of them. The sedimentary structures in three sections, a few tens of metres apart from each other laterally, such as hummocky cross-stratification, wave-generated cross-bedding, parallel bedding, erosional surfaces, and graded bedding, which are considered characteristic of tempestites, are clearly present. Additionally, fining-upwards units and biogenic escape structures located at different levels of these sections indicate a similar origin. The vertical variations in layer thickness, grain size, and sedimentary structures in these sedimentary sections indicate fluctuating hydrodynamic conditions during deposition, while lateral decrease in the size and wavelength of the structures reflects deepening. This interpretation of storm-induced deposition is compatible with regional palaeoclimatological and palaeogeographical data, and is supported by evidence of Quaternary storm-induced sedimentation in adjacent lacustrine basins in the region

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“…These examples clearly show that the general context of a basin is essential to understand the relationships between sediment accumulation and bioturbation. Schwarz et al (2021) provided an exciting case study for the importance of basin configuration and this enlightening investigation emphasized the role of ichnology in general environmental characterization and interpretation. When going in more detail, probably short-term environmental changes can be deciphered by analyzing the trace fossil suites and their size in such deposits.…”

Section: Modulation Of Shallow-marine Benthic Habitats and Bioturbati...mentioning

confidence: 99%

Preface: Ichnology, trace fossils and depositional environments

Wetzel

Rodrı́guez-Tovar

2021

Palaeogeography, Palaeoclimatology, Palaeoecology

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Architecture and controls of thick, intensely bioturbated, storm-influenced shallow-marine successions: An example from the Jurassic Neuquén Basin (Argentina)

Cited by 5 publications

References 42 publications

On depositional processes governing along‐strike facies variations of fine‐grained deposits: Unlocking the Little Ice Age subaqueous clinothems on the Adriatic shelf

On depositional processes governing along‐strike facies variations of fine‐grained deposits: Unlocking the Little Ice Age subaqueous clinothems on the Adriatic shelf

First record of tempestites from Quaternary lacustrine deposits in the Ağrı Basin (Eastern Anatolia, Türkiye): palaeoclimatological and palaeogeographic implications

Preface: Ichnology, trace fossils and depositional environments

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