Littérature scientifique sur le sujet « Flysch basin »
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Articles de revues sur le sujet "Flysch basin"
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Šamajová, Lenka, Jozef Hók, Tamás Csibri, Miroslav Bielik, František Teťák, Bibiana Brixová, Ľubomír Sliva et Branislav Šály. « Geophysical and geological interpretation of the Vienna Basin pre-Neogene basement (Slovak part of the Vienna Basin) ». Geologica Carpathica 70, no 5 (1 octobre 2019) : 418–31. http://dx.doi.org/10.2478/geoca-2019-0024.
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Abstract The Vienna Basin is situated at the contact of the Bohemian Massif, Western Carpathians, and Eastern Alps. Deep borehole data and an existing magnetotelluric profile were used in density modelling of the pre-Neogene basement in the Slovak part of the Vienna Basin. Density modelling was carried out along a profile oriented in a NW–SE direction, across the expected contacts of the main geological structures. From bottom to top, four structural floors have been defined. Bohemian Massif crystalline basement with the autochthonous Mesozoic sedimentary cover sequence. The accretionary sedimentary wedge of the Flysch Belt above the Bohemian Massif rocks sequences. The Mesozoic sediments considered to be part of the Carpathian Klippen Belt together with Mesozoic cover nappes of Alpine and Carpathian provenance are thrust over the Flysch Belt creating the third structural floor. The Neogene sediments form the highest structural floor overlying tectonic contacts of the Flysch sediments and Klippen Belt as well as the Klippen Belt and the Alpine/Carpathians nappe structures.
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Środoń, Jan. « Diagenetic history of the Podhale flysch basin. » Geotourism/Geoturystyka 13, no 1 (2008) : 45. http://dx.doi.org/10.7494/geotour.2008.13.45.
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Kranner, Matthias, Mathias Harzhauser, Fred Rögl, Stjepan Ćorić et Philipp Strauss. « Biostratigraphic constraints for a Lutetian age of the Harrersdorf Unit (Rhenodanubian Zone) : Implication for basement structure of the northern Vienna Basin (Austria) ». Geologica Carpathica 70, no 5 (1 octobre 2019) : 405–17. http://dx.doi.org/10.2478/geoca-2019-0023.
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Abstract The formations underlying the Neogene infill of the Vienna Basin are still poorly documented. Until now correlation of subsurface lithostratigraphic units with those of the Rhenodanubian nappe system and the Magura nappe system, outcropping at the basin margins, has been based on extrapolations. A recent drilling campaign in the Bernhardsthal oil field of the northern Vienna Basin in Austria reached the pre-Neogene basement and provided cuttings for biostratigraphic and paleoecological analyses. Based on these data, acquired by using detailed micro- and nanno-paleontological analyses, a Lutetian age (middle Eocene) and a bathyal depositional environment for the Flysch of the Harrersdorf Unit was documented. The lithological similarity of the drilling with the Steinberg Flysch Formation of the Greifenstein Nappe and its Lutetian age suggests, that the middle Eocene part of the Harrersdorf Unit represents a continuation of the Greifenstein Nappe of the Rhenodanubian Flysch, rather than a frontal part of the Rača Nappe of the Magura Flysch as previously thought.
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Hnylko, O. M. « GEODYNAMICS ». GEODYNAMICS 1(10)2011, no 1(10) (28 juin 2011) : 47–57. http://dx.doi.org/10.23939/jgd2011.01.047.
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The tectonic units of the Carpathians are considered in terms of the terrain analysis. Carpathathian orogen is build up of three main elements: microcontinental terrains, sutures and flysch-molasse accretionary prism. There are two main terrains: a northern ALCAPA and a southern Tisza-Dacia. Sutures (Fore-Marmarosh suture, Pieniny Klippen Belt and others), marking the ancient oceanic basins, bound these terrains. The Flysch Carpathians are regarded as the Cretaceous-Neogene accretionary prism. Growing the prism was caused by the Alpine subduction of the Carpathian Flysch basin basement beneath both the ALCAPA and Tisza-Dacia terrains.
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GOLONKA, JAN, MICHAŁ KROBICKI, ANNA WAŚKOWSKA, MAREK CIESZKOWSKI et ANDRZEJ ŚLĄCZKA. « Olistostromes of the Pieniny Klippen Belt, Northern Carpathians ». Geological Magazine 152, no 2 (25 juillet 2014) : 269–86. http://dx.doi.org/10.1017/s0016756814000211.
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AbstractThe olistostromes form two belts within the Pieniny Klippen Belt (PKB) in the Northern Carpathians. They mark an early stage of the development of the accretionary prism. The first belt was formed during Late Cretaceous time as a result of subduction of the southern part of the Alpine Tethys. The fore-arc basin originated along this subduction zone, with synorogenic flysch deposits. Huge olistoliths deposited within the Cretaceous–Palaeogene flysch of the Złatne Basin, presently located in the vicinity of the Haligovce village (eastern Slovakia), provide a good example of the fore-arc olistostrome setting. The second belt is related to the movement of the accretionary prism, which overrode the Czorsztyn Ridge during Late Cretaceous–Paleocene time. The destruction of this ridge led to the formation of submarine slumps and olistoliths along the southern margin of the Magura Basin. The Upper Cretaceous – Paleocene flysch sequences of the Magura Basin constitute the matrix of olistostromes. The large Homole block in the Jaworki village represents the best example of the Magura Basin olistolith. Numerous examples of olistoliths were documented in western Slovakia, Poland, eastern Slovakia and Ukraine. The olistostromes formed within the Złatne and Magura basins orginated during the tectonic process, forming the olistostrome belts along the strike of the PKB structure.
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D’errico, Marco, Angelida Di Staso, Annamaria Fornelli, Domenico Guida, Francesca Micheletti, Vincenzo Perrone et Giuliana Raffaelli. « The Numidian Flysch : a guide formation for the reconstruction of the paleogeography and tectono-sedimentary evolution of southern Apennines ». Bulletin de la Société Géologique de France 185, no 5 (1 mai 2014) : 343–56. http://dx.doi.org/10.2113/gssgfbull.185.5.343.
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Abstract The Numidian Flysch shows constant lithological features from the strait of Gibraltar to central Italy. It is characterized by quartzarenites showing grains of monocrystalline, rounded and frosted quartz, and by kaolinitic mudstones. This research has pointed out that in the southern Apennines 1) the Numidian Flysch was deposited exclusively in the Campania-Lucania carbonate platform and in the Lagonegro-Molise basin, both located on the Apulian continental margin, and never is present in tectonic units originated from the oceanic area located west of that margin; 2) in the axial zone of the Lagonegro basin it stratigraphically follows a formation consisting of varicoloured clays (Argille Varicolori Auct.); 3) its age is limited to the early-middle Langhian, that is to say, it begins to sediment about 7 million years later than in the Maghrebian chain and deposited for a time span limited to 1–1.5 Ma. The thickness of the Numidian Flysch gradually decreases towards the north from about 600–1,000 meters to a few tens of meters and in some of the northeastern outcrops it is represented only by some layers of quartzarenites. This is accompanied by a decrease in size of the particles becoming more and more finer. In addition, northwards and frequently in the same section, a lower mineralogical and textural maturity (from quartzarenites to litharenites, and presence of abundant matrix, sub-angular, polycrystalline and deformed quartz grains) is well recognizable. In the Campania-Lucania carbonate platform the Numidian Flysch evolves to pelagic marly-clayey deposits, followed by mineralogically immature turbidite sandstones of Serravallian age. In the Lagonegro basin the Numidian Flysch replaces Cretaceous-lower Miocene turbidite deposits, consisting of limestones and red marls, on the western side of the basin, variegated clays in the axial zone and calcareous turbidites or variegated clays in the eastern side. Since the late Langhian, it evolves to pelagic sediments followed by lower Tortonian immature turbidite sandstones. In the successions of the Molise basin the Numidian Flysch is interbedded in a succession consisting of calcareous turbidites and pelagic limestones and marls, reaching the Messinian. The lithological features and the age of the Numidian Flysch in central-southern Apennines, therefore, point out an evolution different from that of the Numidian Flysch of the Maghrebian chain. During the early Miocene, a paleogeographic barrier or other unknown obstacles prevent Numidian sands from reaching the south-Apenninic domains. In the early Langhian, the disappearance of these obstacles allows sands to reach the deep basins located on the Apulian margin. In the late Langhian the Numidian sedimentation is canceled and replaced by mainly pelagic sediments, which will evolve to foredeep deposits in the Serravallian-Messinian time span. In addition, the significant presence of feldspathic and lithic grains testifies a double detrital supply: polycyclic quartzose sands and kaolinitic mudstones from the African craton and metamorphic and plutonic grains from the Hercynian or older rocks of the internal units of the southern Apennines. The Numidian Flysch of the southern Apennines allows to assign the tectonic units in which is present to the Campania-Lucania carbonate platform or to different zones of the Lagonegro-Molise basin and therefore is of great importance in the reconstruction of both the Mesozoic-Cenozoic paleogeography and a tectono-sedimentary evolution very difficult to decipher, given the convergence of sedimentary facies in the Apenninic deep basins since Cretaceous to Miocene, the presence of several tectonic phases and of out of sequence and back-thrusts.
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Thum, Laurent, Reto De Paoli, Gérard M. Stampfli et Patrice Moix. « The Piolit, Pelat and Baiardo Upper Cretaceous flysch formations (western Alps) : geodynamic implications at the time of the Pyrenean tectonic phases ». Bulletin de la Société Géologique de France 186, no 4-5 (1 juillet 2015) : 209–21. http://dx.doi.org/10.2113/gssgfbull.186.4-5.209.
Texte intégralRésumé :
AbstractThe Piolit, Pelat (French Alps) and Baiardo (Italian Maritime Alps) units contain Upper Cretaceous carbonate turbidites formations, with minor siliciclastic components. They are flysch formations, linked with the Pyrenean compressive events through their ages and their “subbriançonnais” structural position. Sedimentological, mineralogical (heavy minerals), and geochemical analysis, point to a potential “Pyrenean signature” which would testify the Late Cretaceous collision between the Ibero-Briançonnais terrane and the European plate. A “Dauphinois” origin and basin inversion erosion is proposed for the zircon-tourmaline-rutile (ZTR) bearing Piolit flysch, deposited from the Coniacian to the Campanian. A Penninic origin with tectonic inversion and erosion of former tilted blocks of the European margin from the Turonian to the Paleocene is proposed for the ZTR bearing Pelat flysch. Comparison with the Niesen (Swiss Prealps) and La Ciotat (Provence) flysch depositional context, allows to better constrain the Pyrenean compressive event in the Alpine domain. The Senonian part of the Baiardo flysch, that contains a garnet-dominated heavy mineral association and distinct geochemical trends, is allotted to the Liguro-Piemontais domain and to the Alpine collision stricto sensu.
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Atouabat, Achraf, Sveva Corrado, Andrea Schito, Faouziya Haissen, Oriol Gimeno-Vives, Geoffroy Mohn et Dominique Frizon de Lamotte. « Validating Structural Styles in the Flysch Basin Northern Rif (Morocco) by Means of Thermal Modeling ». Geosciences 10, no 9 (19 août 2020) : 325. http://dx.doi.org/10.3390/geosciences10090325.
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Vitrinite reflectance and a micro-Raman spectroscopy parameters data set have been acquired on dispersed organic matter of the Maghrebian flysch basin and the Tangiers unit across a NE-SW section in the north-western Rif belt (North Morocco). Thermal maturity shows increasing values from the hinterland to the external unit (from NE to SW). Paleo-thermal indicators show that the internal flysch basin (i.e., the Mauretanian unit) is less mature than the external one, (i.e., the Massylian unit), with Ro% and Ro eq. Raman values ranging from 0.64% to 1.02% (from early mature to late mature stages of hydrocarbon generation). 1D thermal modeling estimates the overburden now totally eroded ranging from 3.1 km to 6.0 km, and has been used as constraint to reconstruct the complete thrust wedge geometry in Miocene times. The reconstructed geometry accounts for high shortening (about 63%) due to the development of an antiformal stack in the frontal part of the wedge made up by the flysch succession. This stacking is interpreted as a consequence of the western translation of the Alboran Domain in the core of the Betic-Rif orogenic system.
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González-Bonorino, Gustavo. « Early development and flysch sedimentation in Ordovician Taconic foreland basin, west-central Newfoundland ». Canadian Journal of Earth Sciences 27, no 9 (1 septembre 1990) : 1247–57. http://dx.doi.org/10.1139/e90-133.
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During the Early to Late Ordovician the Taconic foredeep in west-central Newfoundland evolved from an underfilled to an overfilled state in response to cratonward advance, thickening, and erosion of the Taconic Orogen. Early orogen-derived sediment in the foreland basin consisted of middle(?) to lake Arenigian deep-water mudstones that accumulated on an inner (craton-facing) slope prism (uppermost parts of Shallow Bay and Green Point formations and correlative units). These deposits are interbedded with and overlie passive-margin slope sediments. In the middle Arenigian to early Llanvirnian, sand from the orogen formed several small, sand-rich submarine fans (Lower Head Formation and correlative units) on the lower reaches of the inner slope and basin plain. The fans may have been fed by closely spaced rivers draining the orogen, as presently occurs in western South America. Only proximal portions of these fans are now exposed. The flysch basin was narrow, constricted by the inner slope and the passive-margin slope, and located a short distance seaward from the buried hingeline of the proto-North American craton. As the orogen thickened sufficiently to override the crustal ramp, the carbonate shelf on the craton drowned, clastic depocentres migrated onto the foundered craton, and a thicker flysch (Mainland Sandstone) accumulated in Llanvirnian-Llandeilian time. In the Caradocian the foreland basin was overfilled with shallow-marine terrigenous sediments (Long Point Formation). Regional flysch dispersal was from a St. Lawrence promontory to a Quebec reentrant.
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Francírek, Michal, et Slavomír Nehyba. « Evolution of the passive margin of the peripheral foreland basin : an example from the Lower Miocene Carpathian Foredeep (Czech Republic) ». Geologica Carpathica 67, no 1 (1 février 2016) : 41–68. http://dx.doi.org/10.1515/geoca-2016-0003.
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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 sea-level change.
Thèses sur le sujet "Flysch basin"
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Sinclair, Hugh D. « The North Helvetic Flysch of eastern Switzerland : Foreland Basin architecture and modelling ». Thesis, University of Oxford, 1989. http://ora.ox.ac.uk/objects/uuid:0e83a6d2-cf51-4dd3-b4bb-523a1d28fc90.
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The North Alpine Foreland Basin (NAFB) comprises sediments of late Eocene to middle Miocene age. The earliest deposits are the North Helvetic Flysch which are exposed in the regions of Glarus and Graubunden, eastern Switzerland. The Taveyannaz sandstones are the first thrust wedge (southerly) derived sediments of the North Helvetic Flysch. The Taveyannaz basin was divided into two sub-basins by a thrust ramp palaeohigh running ENE/WSW (parallel to the thrust front). Palaeocurrent directions were trench parallel towards the ENE. Sedimentation in the Inner basin (140m thick) is characterised by very thick bedded turbidite sands generated by thrust induced seismic events confined within the thrust-top basin. The Outer basin (240m min. thickness) comprises 10-15 sand packages (5-100m thick) formed by turbidite sands which are commonly amalgamated. Sedimentation in the Outer basin is considered to have been controlled by thrust-induced relative sea-level variations. The Inner basin underwent intense deformation at the sediment/water interface prior to the emplacement of a mud sheet over the basin whilst the sediments were partially lithified. Later tectonic deformation involved fold and thrust structures detaching in the underlying Globigerina marls. The stratigraphy of the NAFB can be considered as two shallowing upward megasequences separated by the base Burdigalian unconformity. This stratigraphy can be simulated by computer by simplifying the foreland basin/thrust wedge system into 4 parameters: 1) the effective elastic thickness of the foreland plate, 2) a transport coefficient to describe the erosion, transport and deposition of sediment, 3) the surface slope angle of the thrust wedge, 4) the thrust wedge advance rate. The Alpine thrust wedge underwent thickening during the underplating of the External Massifs at about 24-18Ma. This event is simulated numerically by slowing the thrust wedge advance rate, and increasing the slope angle and keeping all other parameters constant. This event causes rejuvenation of the forebulge, and erosion of the underlying stratigraphy, so simulating the base Burdigalian unconformity without recourse to eustasy or anelastic rheologies to the foreland plate.
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Thomas, Myron. « Sedimentology and basin context of the Numidian Flysch Formation ; Sicily and Tunisia ». Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/sedimentology-and-basin-context-of-the-numidian-flysch-formation-sicily-and-tunisia(4b78e06d-f3b5-43da-9d7b-989097470889).html.
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The Numidian Flysch Formation is a regionally extensive series of deep marine sandstones and mudstones which crop out in Spain, Morocco, Algeria, Tunisia, Sicily, and southern mainland Italy. The formation is dated as Oligocene to mid Miocene and represents an approximately linear series of submarine fans characterised by a quartz rich petrofacies. Their unique regional extent is nearly twice the length of the Angolan margin although issues surrounding provenance and basin context have hampered understanding. The Numidian Flysch Formation was deposited into the Maghrebian Flysch Basin (MFB) which was a foreland basin remnant of the neo-Tethys ocean in the western portion of the present day Mediterranean Basin. The basin was bordered to the north by an active margin which consisted of a southward verging accretionary prism, underlain by European crustal blocks which rode above northwards subducting oceanic crust. To the south, the African margin formed a passive-margin to the basin.The huge amount of geophysical and outcrop data which is becoming increasingly available suggests that submarine slope systems are more complex than previously thought, including topographically complex slopes, a wide variety of density flow types, and flow transformations. This thesis aims to review the sedimentology of the Numidian Flysch Formation in Sicily and Tunisia in light of these developments. Constraining the provenance and basin context of the formation is therefore of paramount importance, and this is also addressed.Commonly used evidence for the provenance of Numidian Flysch sandstones include its quartz rich petrology, an Eburnian and Pan-African age detrital zircon suite, its structural position within the foreland fold and thrust belt, and complex palaeocurrent orientations. when reviewd in their entirety and placed in context of other basin successions, the Numidian Flysch is constrained to a depositional location in the south of the basin, with polycyclic sediment sourced from African basement. The Numidian Flysch Formation is therefore a 'passive margin' sequence as opposed to a flysch sensu stricto. The timing of Numidian Flysch deposition is also coincidental with uplift of the Atlas chain in North Africa, during a period of significantly wetter conditions. A switch from carbonate to clastic deposition results from these conditions, and the Numidian Flysch Formation is considered an offshore extension of this regional sedimentation.Characterisation of outcrops in Sicily and Tunisia shows remarkably similar lithofacies and depositional elements. Sinuous upper slope channel complexes are entrenched within slope deposits to a depth of 100 m and occur within channel systems up to 5.7 km in width. They are filled predominantly with massive ungraded sandstones interpreted to aggrade through quasi-steady turbidity currents, interbedded with normally graded turbidites. Channel elements are subseismic in scale, are nested within complexes and show sinuosity. Coupled with lateral offset stacking, this strongly affects the architecture and facies heterogeneity of channel complexes. When compared to globally reviewed data, the thickness of channel elements as shown through their frequency distribution also suggests a fundamental control upon the degree of slope incision which is as yet unconstrained.In lower slope settings, channel complexes stack aggradationally with a width of over 1000 m. They are also predominantly filled with massive sandstones in fining upwards cycles, and show heterogeneous margins and large scale slumping. In central Sicily, large channel complexes are overlain by a stacked lobe complex, in turn overlain by a channel lobe transition zone. This progression coupled with palaeocurrent variability suggests intraslope deformation strongly impacts transiting flows through changes in flow capacity. Salt tectonics, present in Algeria and Tunisia is a possible forcing mechanism.Taken in context, the sections in Sicily record a proximal to distal palaeogeographic trend which is reconstructed towards the north/northeast once well constrained tectonic rotations are taken into account. Given regional similarities, controls upon slope architecture are interpreted to be similar throughout the basin, and deposits in Sicily therefore provide a good analogue for the remainder of the basin. These results therefore allow for a better constrained fan architecture, along with the allogenic controls upon them. Given the continental extent of this formation, the Numidian Flysch Formation provides a unique opportunity to study controls upon fan architecture once provenance and intraslope topography is factored in.
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Buoncristiani, Jean-François. « Production sédimentaire détritique des systèmes glaciaires. Quantification des produits stockés dans un lac proglaciaire durant la dernière glaciation : exemple du lac de la Combe d’Ain (Jura, France) ». Dijon, 1997. http://www.theses.fr/1997DIJOS062.
Texte intégralRésumé :
Cette thèse représente la quantification de la production sédimentaire détritique des systèmes glaciaires. L'objectif a été réalisé par l'étude d'un géosystème lacustre proglaciaire : le lac de la Combe d’Ain Jura, France). Le premier chapitre est consacré à l'analyse des différents processus d'érosion glaciaire actuels de façon qualitative et quantitative. Le chapitre 2 consiste à déterminer la surface du sous-système émetteur. Dans une première phase, le bassin-producteur supra-glaciaire est déterminé en fonction de la topographie de la surface glaciaire et des lignes d'écoulement. Puis, une seconde phase consiste à limiter le bassin sous-glaciaire en fonction de la topographie du substrat et de ses vallées. Dans le chapitre 3, l'organisation sédimentaire du sous-système récepteur est réalisé, ce qui permet de déterminer sa durée de fonctionnement. Le chapitre 4 représente la reconstruction de la géométrie des surfaces supérieures et inférieures du remplissage lacustre. Deux méthodes sont utilisées : une méthode directe (cartographie des témoins dans le remplissage), et une méthode géophysique indirecte (sismique réflexion haute résolution). Le chapitre 5 définit le bilan sédimentaire du géosysteme et permet le calcul des taux de stockage, puis des taux de production sédimentaire spécifique et de dénudation du géosysteme. Une comparaison avec le géosysteme lacustre de Chaillexon situé dans le jura et fonctionnant depuis 12 000 ans permet de définir les variations de la production sédimentaire au cours du dernier cycle climatique glaciaire-interglaciaire. On constate ainsi que la production sédimentaire durant la phase glaciaire est 100 fois supérieure a celle durant la phase interglaciaire. Il ressort de cette thèse la notion de rushes détritiques d'origine glaciaire, dont l'importance sur les exportations de matière dans les couloirs alluviaux et au-delà, sur les dépôts en domaine marin est à prendre en compte dans les bilans.
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Garba, Zibo. « Dynamique des transferts éoliens et enregistrement sédimentaire de l'aridité à la limite Sahara/Sahel au quaternaire supérieur (massif de Termit et manga méridional, Niger) ». Dijon, 1997. http://www.theses.fr/1997DIJOS046.
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La sédimentation détritique en milieu continental aride a été étudiée dans le bassin du lac Tchad, au Niger oriental. L'étude compare deux géosystèmes isolés, distants de 250 km : Termit-ouest (un ancien lac de piémont en bordure du Sahara) et Bougdouma (une mare interdunaire, au sud de l'erg du Manga, en zone sahélienne). Cette région occupe une position privilégiée sur les trajectoires éoliennes entre le Sahara et l'Atlantique ; les vents de sable et de poussières y sont plus fréquents que les pluies. Une attention particulière a donc été apportée a l'évolution de la dynamique sédimentaire éolienne depuis 15,000 ans. On distingue ainsi les sédiments sableux accumulés par saltation ou roulement, ou soumis à la déflation, et les sédiments fins mis en place par suspension (poussières incluant notamment des sables très fins, des silts et des argiles). Les silts et sables éoliens se distinguent par leur classement. Ils sont organisés en stocks granulométriques cohérents dont la mise en place peut être déterminée par une adaptation du diagramme moyenne / classement de Besler. Ces dépôts sont donc identifiables et quantifiables au sein de dunes, de sols humides, d'épandage, de mares ou de lacs. Il convient néanmoins de tenir compte d'éventuels remaniements (caractères éoliens hérités ou acquis ?), mélanges (autochtonie ou allochtonie des argiles ?), et diagenèse (dissolutions t néoformations liées aux circulations d'eau). En définitif, un indice sédimentologie de l'aridité est proposé, sur la base d'une distinction des dynamiques de dépôts éoliens et aquatiques. A Termit-ouest, cet indice est testé par une analyse factorielle des correspondances. La comparaison des deux enregistrements montre souvent des distorsions introduites par le fonctionnement propre à chaque géosytème enregistreur. Ainsi, paradoxalement, certains dynamiques éoliennes sont moins bien enregistrées à Termit où le massif constitue un obstacle protecteur. Inversement, les variations de l'humidité y sont amplifiées par la taille du bassin versant et s'y remarquent mieux dans la sédimentation détritique en raison du ruissellement. D'un point de vue paléoclimatique, on retiendra la confirmation du retour au Sahel d'une humidité notable des 14 a 15,000 ans BP environ, ainsi que la confirmation de l'existence d'un maximum humide entre 9500 et 6500 ans BP environ. Par contre, on note pour la première fois l'existence d'une dynamique éolienne notable affectant la zone sahélienne pendant ce même maximum humide.
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Leon, Chirinos Isabel. « Etude sédimentologique et reconstitution du cadre géodynamique de la sédimentation détritique fini-éocène-oligocène dans le bassin sud-pyrénéen entre Sanguesa et Pamplona ». Pau, 1985. http://www.theses.fr/1985PAUU1023.
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Tramparulo, Francesco D'Assisi. « Tectonics, structural analysis and geodynamic evolution of the Maghrebian Flysch Basin and Ligurian Accretionary Complex Units : Examples in the Western Mediterranean Area ». Tesi di dottorato, 2015. http://www.fedoa.unina.it/10187/1/Ph.D%20Thesis%20Tramparulo%20Francesco.pdf.
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This work provides a structural study on some successions of the Ligurian Accretionary Complex (LAC; southern Italy), Maghrebian Flysch Basin (MFB; Morocco) and External Dorsale Calcaire (Morocco). The LAC Units, cropping out in the southern Apennines include the sedimenary deep basin successions of Nord Calabrese, Parasicilide and Sicilide. Presently they are the highest tectonic units of the South Apennine fold and thrust belt. They are all characterized by a polyphasic and
progressive deformation related to the Early Miocene inclusion in the tectonic accretionary wedge, by means of a frontal accretion mechanism, with a mean E/SE tectonic vergence. A subsequent deformation stage, associated to the eastward migration of the thrust front, affecting also the Middle-Upper Miocene unconformable wedge-top basin deposits, was characterized by a mean E/NE tectonic transport. In this orogenic phase the Apennine thrust sheet pile, formed by LAC and Apennine Platform Units, tectonically covered the successions located in the westernmost sector of the Lagonegro-Molise Basin. Finally a Pliocene-Middle Pleistocene regional fold set deformed the whole orogenic prism, comprised the LAC Units as consequence of a thick-skinned tectonics expressed by means of deeply rooted thrusts in the buried Apulian Platform carbonates. The metamorphic units of LAC, analyzed in this study, are the Frido and Diamante-Terranova Units, cropping out at Calabria-Basilicata
boundary and northern Calabria, respectively. Both units are characterized by a HP/LT metamorphism reaching pressures of ca. 1.4/1.2 and 1.0 GPa and temperatures of 350 360 and 380 °C, respectively. The HP/LT parageneses include the Fe-carpholite, chlorite and phengite for the Frido and glaucophane, lawsonite, epidote and chlorite
for the Diamante-Terranova Unit. The tectonic exhumation was recorded by Ca amphiboles. The P-T-paths, presented below, of both units indicate a cool and rapid
exhumation. This is testified also by the preservation of HP/LT mineral parageneses and by non-isothermal exhumation such as marked in the P-T-paths of the Frido(this work) and Diamante-Terranova (Liberi and Piluso, 2009) Units. These units were subducted in the latest Oligocene and Early Eocene, respectively, with their complete exhumation in the middle Tortonian. The comparable geodynamic evolution of the LAC Units suggests an origin of all successions in a common oceanic domain
(Ligurian Ocean) characterized by a western sector floored by oceanic crust (Diamante-Terranova domain), a central sector represented by an Ocean Continent Transition (Frido and Nord-Calabrese domain) and an eastern area formed by thinned continental crust (Parasicilide and Sicilide domain). A further aim of this study is the reconstruction of the tectonic evolution of some successions of the Maghrebian Flysch Basin (MFB) domain (Predorsalian and Massylian Units) and the External Dorsale Calcaire in a key area (Chefchaouen) of
the Rif chain in the northern Morocco. Maghrebian Flysch Basin successions show a comparable stratigraphy with the sedimentary LAC successions, suggesting paleogeographic continuity between LAC, located to E/NE, and the MFB to the W. The Triassic-Lower Miocene External Dorsale Calcaire succession overthrust the Predorsalian Unit through a regional thrust fault well-exposed in Chefchaouen area. The kinematic analysis of this structure and all minor structures in the footwall,
indicate a SW-tectonic vergence. The Predorsalian unit in turn overthrust the Massylian succession characterized by a similar progressive deformation. The whole tectonic pile was subsequentely deformed by thrust and folds verging to NW. Like the sedimentary LAC units, the MFB Units were deformed by frontal accretion in the
Burdigalian-Langhian time. The External Dorsale Calcaire provides a good example of Inversion Tectonics. The Liassic succession (cherty limestones and conglomerates)
recorded the extension related to the Jurassic rifting of the Neotethys Domain as normal faulting and veining.The subsequent inclusion of these rocks in the orogenic
wedge, which mainly occurred in the Miocene time, deformed the most of pre-orogenic structures in a passive manner, with only few cases of reverse reactivation;
whereas, frequently, pre-orogenic normal fault planes show only an indentation of hanging-wall and footwall (buttressing effect). The orogenic deformation includes two main stages; the first tectonic pulse, which occurred during the Burdigalian-Langhian interval, was characterized by a NE-SW shortening and recorded by folds, thrust and back-thrust faults. During this stage the carbonates of the External Dorsale Calcaire
tectonically covered the Predorsalian succession, producing, in the thrust front, a SW verging regional fold. The second orogenic deformation, consisting of a NW-SE shortening, was expressed by thrust faults and related folds both verging to NW and SE, which probably occurred in the Late Miocene-Pliocene time.
Livres sur le sujet "Flysch basin"
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Kiszka, Krzysztof. Ruchy osuwiskowe w świetle badań dendrogeomorfologicznych na podstawie analizy osuwiska Sawickiego w Beskidzie Niskim = Landsilde movements based on dendrogeomorphological research based on a analysis of the Sawicki Landslide in the Beskid Niski mts. Instytut Geografii i Przestrzennego Zagospodarowania im. Stanisława Leszczyckiego, Polska Akademia Nauk, 2021. http://dx.doi.org/10.7163/9788361590835.
Texte intégralRésumé :
Research concerns the problem of landslide movement, which is one of the most important geomorphological processes in the Carpathians. The aim of the studies is to determine the temporal and spatial complexity of landslide activity and to demonstrate the suitability of using different species of conifers in the dendrogeomorphological method. The Sawicki landslide located in Beskid Niski Mts., which is one of the largest landslides in the Polish Flysch Carpathians, was selected for dendrogeomorphological analysis. The dendrogeomorphological method and geomorphological mapping were used in the research. 1078 samples from conifers (fir, spruce, larch and pine) growing on the Sawicki landslide and its immediate surroundings were taken using an increment borer in 2013- 2018. The cores were taken from the upslope and downslope side of the tree stump. The width of annual tree rings were measured for each extracted core sample. The landslide activity was assessed on the basis of the eccentricity, the eccentricity index and its yearly variation. Geological and topographic maps, published data on landslides activity in the research area, precipitation data from the Research Station in Szymbark (Institute of Geography and Spatial Organization Polish Academy of Science) for 1968-2017 and from the meteorological station in Krynica (Institute of Meteorology and Water Management) for 1881-2010 were also used for dendrogeomorphological research of Sawicki landslide. The research shows that the Sawicki landslide is characterized by varied temporal and spatial complexity of landslide activity. The dynamics of displacements within the research sites and research sub-sites, including various fragments of landslides, and movements of colluvial packages is spatially mosaic and chaotic in time. Mass movements covering almost the entire surface of the landslide occurred in the years 1913-1914 and 1974-1975, while in the years 1888, 1906-1907, 1916, 1918, 1929, 1965, 1973, 1980, 1983-1985, 1997 landslide activity was recorded only in its particular parts. The largest variation in the dynamics of landslide movements is characteristic for the period 1970-1985. It was also found that in the initial stage of formation of the landslide tongue, the colluviums movement is disordered. During further downhill movement, the direction of displacement is arranged. Periods of Sawicki landslide activity refers to extremely humid years (62%) and wet years (48%) and they are consistent with the years of landslides activity in Szymbark, listed in the current literature of the subject. The most predisposed conifer species to dendrogeomorphological analysis were spruce, larch and fir. Despite its limitations, the dendrogeomorphological method is a useful tool in landslide activity research.
Chapitres de livres sur le sujet "Flysch basin"
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Fletcher, Frank W. « Case Study : Hydrogeologic Investigation of a Proposed Flyash Storage Site ». Dans Basic Hydrogeologic Methods, 21–26. Boca Raton : Routledge, 2023. http://dx.doi.org/10.1201/9781315138114-3.
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Alford, G. D. « FLYSIM — A Program for a Basic Flight Simulator ». Dans Reliability and Robustness of Engineering Software II, 313–25. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3026-4_24.
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Borutska, Yuliia, Pankaj Srivastava, Iryna Getman, Tetiana Holovach et Sofiia Muzyka. « PECULIARITIES OF THE FLYSCH FORMATION OF THE UKRAINIAN CARPATHIANS AND THEIR INFLUENCE ON THE FORMATION OF FRESH WATERS OF THE BASIN ». Dans Scientific foundations of solving engineering tasks and problems, 211–17. International Science Group, 2021. http://dx.doi.org/10.46299/isg.2021.mono.tech.ii-211-217.
Texte intégralActes de conférences sur le sujet "Flysch basin"
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Francu, J., M. Radke et R. G. Schaefer. « Oil-oil and oil-source rock correlations in the Northern Vienna Basin and adjacent Flysch Zone ». Dans 56th EAEG Meeting. European Association of Geoscientists & Engineers, 1994. http://dx.doi.org/10.3997/2214-4609.201410136.
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Hinsch, Ralph. « Indications of Deep Marine Fans in the Early Miocene Foredeep of Lower Austria : A Potential New Play ». Dans Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/208133-ms.
Texte intégralRésumé :
Abstract The petroleum province in Lower Austria resulted from the Alpine collision and the subsequent formation of the Vienna Basin. OMV is active in this area since its foundation in 1956. Several plays have been successfully tested and produced in this complex geological region. The main exploration focus is currently on the deep plays. However, this paper proposes a so far unrecognized and therefore undrilled play in a shallower level to broaden OMV's portfolio in Austria. Seismic re-interpretations of reprocessed 3D seismic data and structural reconstructions were used to review some of the existing plays and get novel ideas from improved understanding of processes. In the frontal accretion zone of the Alpine wedge, the Waschberg-Ždánice zone discoveries are limited to the frontal thrust unit and associated structures. The more internal parts of the thrust belt have only sparsely been drilled and are perceived not to have high-quality reservoir rocks. The detailed structural interpretations indicated that the foredeep axis during the Early Miocene was positioned in the thrust sheet located directly in front of the advancing Alpine wedge (comprising the eroding Rhenodanubian Flysch in its frontal part). Seismic amplitude anomalies can be interpreted to represent Lower Miocene basin floor and slope fans. Nearby wells did not penetrate these fans but drilled instead shale-dominated lithologies. Thus, the presence of potential sand-rich fans in front of the advancing alpine wedge is considered a potential new play in Lower Austria. Analogues are found in Upper Austria some 250 km to the West, where several large gas fields in Lower Miocene deposits located in front of the advancing Alpine wedge have been discovered by another operator. In that area the fans are only partly involved in the fold-thrust belt. In Lower Austria, these fans are located within the rear thrust sheet(s), providing a structural component to a mixed structural-stratigraphic trap. Two potential charge mechanism can be considered: a) biogenic gas charge from the organic matter of surrounding shales (like the Upper Austria analogues) or b) oil charge via the thrust fault planes from the Jurassic Mikulov Formation (the proven main source rock in the broader area). Our results add to the understanding of the Miocene structural-stratigraphic evolution of the Alpine collision zone. The definition of a potential new play may add significant value to OMV's upstream efforts in a very mature hydrocarbon province.
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Gosar, A. « Comparison of geological conditions for high-resolution seismic reflection investigations in flysch and molasse sedimentary basins in Slovenia ». Dans 4th EEGS Meeting. European Association of Geoscientists & Engineers, 1998. http://dx.doi.org/10.3997/2214-4609.201407184.
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Elliott, Gordon, Paul Martin et Daniel D. Uranowski. « Design and Construction of Circular Cofferdams for Earth Retention in a Flyash Disposal Basin ». Dans Earth Retention Conference (ER) 2010. Reston, VA : American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41128(384)36.
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Storm, Stephen K., Danny Storm, Adam C. McClellan, R. F. Storm et Jim Mulligan. « Achieving Simultaneous NOx and Combustion Improvements on a 90MW T-Fired Unit by Applying the Fundamentals ». Dans ASME 2006 Power Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/power2006-88157.
Texte intégralRésumé :
Storm Technologies in cooperation with AES Westover Station implemented a total combustion optimization system approach, including a fan boosted over-fire air system on Unit 13 to reduce the emissions of NOx while also improving and/or maintaining acceptable Carbon in Ash content levels on a daily basis. Implementation of this total airflow & pulverizer performance utilized a fundamental and proven approach to performance optimization and the system has been installed now for over two years and continues to be successful. The results of this systems modifications was up to 60% NOx reduction and payback in months by reducing the need for NOx credits and simultaneously improving unit performance, reliability and fuels flexibility. All of the goals of this program were accomplished and the technical success of this project is once again the results of applying a systematic and comprehensive approach addressing fundamental opportunities for improvement. The benefit of this total combustion optimization project was not only NOx reductions, but also reliability and “fuels flexibility”. Furthermore, foresight in this system was the ability to improve boiler efficiency, heat rate and reduce rates of ammonia when and/or if SCR or SNCR is installed. Since the installation of the FBOFA System it should be noted that AES Westover has been able to consistently attain between .25–.30 lbs/mmBtu NOx and single digit carbon in ash levels with no negative effects of the system installed. The goals of this project were as follows: 1. NOx Reduction from >.54lb/mmBtu (full load) – to ≤ 0.32 lb/mmBtu; 2. Flyash Carbon Content less than 10%; 3. Minimal slagging; 4. Operations with a minimum of 2% Oxygen to maintain a “slag friendly” furnace without exceeding the NOx limits; 5. Maximum Load Capability; 6. Maximum Fuel Flexibility; 7. Total Combustion Optimization & Performance Preservation.
Rapports d'organisations sur le sujet "Flysch basin"
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Turner, E. C. Mesoproterozoic Borden Basin, northern Baffin Island. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/321825.
Texte intégralRésumé :
The unmetamorphosed and nearly undeformed late Mesoproterozoic Borden Basin on northern Baffin Island exhibits sag, rift, and foreland-basin-like phases. A thin, partly subaqueous basal basalt is overlain by mature shallow-marine quartz arenite, upward-deepening siltstone and shale (marking the beginning of rifting), a complex suite of rift-delineated carbonate units containing two dramatic internal unconformities, and a flysch-molasse-like succession containing evidence of sediment derivation from the Grenville Orogen. Geochronological data indicate that deposition of most of the succession took place ca. 1100 to 1050 Ma. One of the carbonate intervals, Nanisivik Formation, is the main host of regional Zn-Pb showings including the past-producing Nanisivik orebody, which formed in the late Mesoproterozoic from low-temperature fluids, and which was emplaced under strong structural and stratigraphic controls. Minimal postdepositional deformation is limited to the emplacement of mafic dykes ca. 720 Ma and repeated reactivation of basement-rooted normal faults.