The syntectonic evolution of foredeep turbidites related to basin segmentation: Facies response to the increase in tectonic confinement (Marnoso-arenacea Formation, Miocene, Northern Apennines, Italy)

Tinterri, Roberto; Tagliaferri, Alessio

doi:10.1016/j.marpetgeo.2015.04.006

Cited by 81 publications

(80 citation statements)

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“…In particular, the grain size breaks and sub‐type 1c beds are evidence of the bypass of the upper turbulent portion of bipartite flows (Mutti et al ., ; Tinterri & Muzzi Magalhaes, ; Stevenson et al ., ), which can transport the finer grain sizes further downcurrent and rework the top of F5 facies into tractive structures, such as megaripples (F6) and even and parallel traction carpets (F7). This facies association, generally featuring high sandstone–mudstone ratios, is very similar to that described by Tinterri & Tagliaferri () in confined foredeeps, where the processes of flow decoupling and bypassing turbulent flows appear to be favoured by decelerations induced by morphological confinement. In particular, high degrees of deceleration could also cause the formation of mud‐draped scours ( sensu Mutti & Normark, , ) linked to hydraulic jumps (see Fig.…”

Section: Facies Analysis and Bed Typessupporting

confidence: 86%

“…). These six bed types are fully consistent with those introduced by Tinterri & Tagliaferri () in the Marnoso‐arenacea Formation, except for some differences due to different basin morphologies and proximity degree between these two turbidite systems. A description and interpretation of the six bed types, key beds and slumps recognized in the studied stratigraphic succession is given below.…”

Section: Facies Analysis and Bed Typessupporting

confidence: 85%

“…However, the general reference facies scheme used for the facies analysis is that by Mutti et al ., which introduced seven main facies types (from F2 to F9) describing the down‐current evolution of a waning and depletive turbidity current. Using a methodology already used by Tinterri & Muzzi Magalhaes () and Tinterri & Tagliaferri () in the Marnoso‐arenacea Formation, the beds have been divided into six main groups (or bed‐types), each characterized by sedimentary features strictly related to the dynamic condition of the turbidity current during deposition. Because turbidity current modifications are strictly related to the structurally‐controlled basin morphology, the analysis of bed type distribution provides important information about the basin morphology.…”

Section: Methodsmentioning

confidence: 99%

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Turbidites facies response to the morphological confinement of a foredeep (Cervarola Sandstones Formation, Miocene, northern Apennines, Italy)

Tinterri

Piazza

2018

Sedimentology

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The Cervarola Sandstones Formation, Aquitanian–Burdigalian in age, was deposited in an elongate, north‐west stretched foredeep basin formed in front of the growing northern Apennines orogenic wedge. As other Apennine foredeep deposits, such as the Marnoso‐arenacea Formation, the stratigraphic succession of the Cervarola Sandstones Formation records the progressive closure of the basin due to the propagation of thrust fronts towards the north‐east, i.e. towards the outer and shallower foreland ramp. This process produces a complex foredeep that is characterized by syn‐sedimentary structural highs and depocentres that strongly influence lateral and vertical turbidite facies distribution. This work describes and discusses this influence, providing a high‐resolution physical stratigraphy with ‘bed by bed’ correlations of an interval ca 1000 m thick, parallel and perpendicular to the palaeocurrents and to the main structural alignments, on an area of ca 30 km that covers the proximal portion of the Cervarola basin in the northern Apennines. The main aim is to show, for the first time ever, a detailed facies analysis of the Cervarola Sandstones Formation, based on a series of bed types that have proven fundamental to understand the morphology of the basin. The knowledge of the vertical and lateral distribution of these bed types, such as contained‐reflected and slurry (i.e. hybrid) beds, together with other important sedimentary structures, i.e. cross‐bedded bypass facies and delamination structures, is the basis for better understanding of facies processes, as well as for proposing an evolutionary model of the foredeep in relation to the syn‐sedimentary growth of the main tectonic structures. This makes the Cervarola Sandstones, like the Marnoso‐arenacea Formation, a typical example of foredeep evolution.

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Section: Facies Analysis and Bed Typessupporting

confidence: 86%

Section: Facies Analysis and Bed Typessupporting

confidence: 85%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Turbidites facies response to the morphological confinement of a foredeep (Cervarola Sandstones Formation, Miocene, northern Apennines, Italy)

Tinterri

Piazza

2018

Sedimentology

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“…). The Northern Apennines are mainly composed of Cretaceous tectonically deformed clays (the Ligurian units; Codegone et al ., ; Carlini et al ., ) and Tertiary turbidites (Marnoso‐Arenacea formation; Ricci Lucchi, ; Tinterri & Tagliaferri, ). The Po River drains an area of about 75 000 km 2 and flows in a west–east direction for 652 km (Fig.…”

Section: Introductionmentioning

confidence: 99%

Early Holocene transgressive palaeogeography in the Po coastal plain (northern Italy)

et al. 2017

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To understand the complex stratigraphic response of a coastal depositional system to rapid eustatic rise and sediment inputs, the evolution of the Adriatic coastline and Po River system, during the post‐glacial (Holocene) transgression, was investigated. The landward migration and evolution of a wave‐dominated estuary was mapped, based on an extensive data set comprising 14 boreholes, 28 core descriptions and 308 piezocone tests, chronologically constrained between 11·5 and 7·0 kyr bp by 137 radiocarbon dates. Palaeogeographic maps reveal temporal differences in retrogradational geometries and mechanisms that likely underpin shoreline retreat. The Po estuary initially developed within a shallowly incised valley and then spread onto the interfluves. Between 11·5 and 9·2 kyr bp the Po fluvial system became avulsive/distributive and wetlands developed in topographically depressed areas. The shoreline retreated at a mean rate of ca 10 m year−1, between 9·2 kyr and 7·7 kyr bp, following a stepped trajectory at the centennial scale. After 7·7 kyr bp, bayhead deltas started to prograde and partially filled the estuary. The overall stratigraphic architecture is interpreted to reflect the sedimentary response of the coastal depositional system to the main pulses of early Holocene eustatic rise. The influence of antecedent topography, partly due to local subsidence, was dominant at the time of initial transgression. Basin morphology influenced sediment dispersal and partitioning. Sediment supplied by the Po River was trapped within the estuary, whereas coastal sand bodies at the estuary mouth were fed by alongshore currents and by reworking of older barriers. High‐resolution age control that ties facies evolution to independently constrained eustasy provides direct data to test models of short‐term coastal retreat under conditions of relative sea‐level rise, and makes this case study a useful analogue for the interpretation of ancient marginal‐marine, retrogradational systems where only stratal geometries are available.

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“…laminar fluxes and diluted conditions observed in the turbulent flows (Tinterri & Tagliaferri, 2015).…”

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Fluid escape structures as possible indicators of past gas hydrate dissociation during the deposition of the Barremian sediments in the Recôncavo Basin, NE, Brazil

et al. 2017

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Empty elliptical vesicles are observed in outcrops of Barremian very fine clayey sandstone to siltstone lacustrine slurry deposits of the Pitanga Member (Maracangalha Formation), exposed in the Maré Island, Southern Recôncavo Basin, Brazil. These sedimentary features have been traditionally interpreted as water escape structures triggered by the diapirism of the underlying shales of the Candeias Formation. This work proposes that vesicles were generated during massive gas hydrate dissociation as a result of tectonic activity in a paleolake system. Tectonic uplift would have triggered both the reduction of the confining pressure as well as an increase in lake bottom temperature, resulting in the instability of gas hydrate and causing intense release of both methane -or carbon dioxide (CO 2 ) -and water. On one hand, this proposal has a strong impact on paleoenvironmental interpretations, giving support to the current hypothesis that rocks related to the Pitanga Member would have been deposited under water columns deep enough for gas hydrate formation and subsequent dissociation. On the other hand, it provides new insights on the genesis of fluid escape structures in sedimentary rocks, both lacustrine and marine, providing a paleobathymetric indicator.KEYWORDS: Fluidization; Gas hydrates; Maracangalha Formation; Pitanga Member; Recôncavo Basin; Vesicles. Recôn-cavo, uma RESUMO: Vesículas elípticas ocas são observadas em afloramentos de arenitos argilosos muito finos e siltitos lacustrinos do Membro Pitanga da Formação Maracangalha, expostos na Ilha de Maré, sudeste da Bacia do Recôncavo, Estado da Bahia, Brasil. Essas rochas foram depositadas em condições subaquosas e são consideradas depósitos gravitacionais do tipo slurry. Essas feições têm sido tradicionalmente interpretadas como sendo estruturas de escape de água, resultado da ação do diapismo de folhelhos sotopostos da Formação Candeias. Este trabalho propõe que as vesículas foram geradas durante uma intensa dissociação de hidratos de gás em resposta à atividade tectônica existente naquele sistema lacustre. O soerguimento tectônico do fundo do lago teria propiciado a redução da pressão confinante nos poros sedimentares, bem como o aumento de temperatura nas águas de fundo, resultando na instabilidade dos hidratos de gás contidos nas porções rasas dos sedimentos e causando uma violenta liberação de metano -ou gás carbônico (CO 2 ) -e água. Se correta, esta proposta tem um grande impacto na interpretação paleoambiental da Bacia do INTRODUCTIONDiscussions regarding the formation and dissociation of gas hydrates in oceans, seas and permafrost environments are widely described in the literature (Collett, 2002;Freire, 2010;Haacke et al., 2009;Hyndman & Davis, 1992;Matsumoto, 2005;Matsumoto et al., 2009). However, studies concerning fossil gas hydrate formation and dissociation in both marine and lacustrine environments are rare, since the evidences of such processes are not based on direct observations, as those of present day gas hydrate occurrences. ...

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The syntectonic evolution of foredeep turbidites related to basin segmentation: Facies response to the increase in tectonic confinement (Marnoso-arenacea Formation, Miocene, Northern Apennines, Italy)

Cited by 81 publications

References 25 publications

Turbidites facies response to the morphological confinement of a foredeep (Cervarola Sandstones Formation, Miocene, northern Apennines, Italy)

Turbidites facies response to the morphological confinement of a foredeep (Cervarola Sandstones Formation, Miocene, northern Apennines, Italy)

Early Holocene transgressive palaeogeography in the Po coastal plain (northern Italy)

Fluid escape structures as possible indicators of past gas hydrate dissociation during the deposition of the Barremian sediments in the Recôncavo Basin, NE, Brazil

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