Relevant bibliographies by topics / Boudins; Boudinage

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Academic literature on the topic 'Boudins; Boudinage'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Boudins; Boudinage"

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Virgo, Simon, Christoph von Hagke, and Janos L. Urai. "Multiphase boudinage: a case study of amphibolites in marble in the Naxos migmatite core." Solid Earth 9, no. 1 (2018): 91–113. http://dx.doi.org/10.5194/se-9-91-2018.

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Abstract. In multiply deformed terrains multiphase boudinage is common, but identification and analysis of these is difficult. Here we present an analysis of multiphase boudinage and fold structures in deformed amphibolite layers in marble from the migmatitic centre of the Naxos metamorphic core complex. Overprinting between multiple boudinage generations is shown in exceptional 3-D outcrop. We identify five generations of boudinage, reflecting the transition from high-strain high-temperature ductile deformation to medium- to low-strain brittle boudins formed during cooling and exhumation. All boudin generations indicate E–W horizontal shortening and variable direction of bedding parallel extension, evolving from subvertical extension in the earliest boudins to subhorizontal N–S extension during exhumation. Two phases of E–W shortening can be inferred, the first associated with lower crustal synmigmatic convergent flow and the second associated with exhumation and N–S extension, possibly related to movement of the North Anatolian Fault.
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Rodrigues, Benedito C., and Jorge Pamplona. "Boudinage and shearband boudins: A meso to micro-scale tool in structural analysis." Journal of Structural Geology 114 (September 2018): 280–87. http://dx.doi.org/10.1016/j.jsg.2017.11.019.

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Cunningham, J., and E. D. Waddington. "Boudinage: A Source Of Stratigraphic Disturbance In Glacial Ice In Central Greenland." Journal of Glaciology 36, no. 124 (1990): 269–72. http://dx.doi.org/10.3189/002214390793701336.

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AbstractA hydrodynamic model of interface stability in a stratified fluid is reviewed. The model predicts that irregularities on the boundaries of a stiff layer, embedded in a soft matrix, are unstable in pure shearing flow, when compression is normal to the layer. Perturbations on such a layer can grow to form symmetric pinch-and-swell structures called boudins. The model predicts initial perturbation growth rates on the boundaries of an interglacial period ice layer. We find that, beneath an ice divide, irregularities on the Sangamon layer boundaries will not kinematically decay, as the layer thins. Finite-element modelling is used to determine the strain history of Sangamon ice beneath the divide at Summit, Greenland. That history suggests boundary irregularities have grown, relative to layer thickness, at least 26 fold over the past 90000 years. The result may be severe distortion or severing of the layer. Core holes penetrating the layer may recover anomalously thick or thin columns of ice resulting in erroneous environmental and climatic interpretations. Radio echo-sounding may be useful in searching for zones of boudinage, which should be avoided when coring. Initial perturbations might arise from mass-balance spatial variations or from transient flow fields.
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Waldron, John W. F. "Structural history of continental margin sediments beneath the Bay of Islands Ophiolite, Newfoundland." Canadian Journal of Earth Sciences 22, no. 11 (1985): 1618–32. http://dx.doi.org/10.1139/e85-171.

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Deformed continental margin sediments of the Curling Group underlie the Bay of Islands Ophiolite in the Humber Arm allochthon of western Newfoundland. Within the allochthon, tectonic slices of sediments are separated by zones of mélange. The earliest structures in the slices are synsedimentary features produced by soft-sediment deformation on the continental slope or rise. Later, west-facing asymmetrical F1 folds without penetrative axial plane cleavage were probably produced during the emplacement of the allochthon in the Middle Ordovician Taconic Orogeny. Associated extensional structures include shear-fracture and extension-fracture boudins. Pervasive cataclastic shearing of shale and boudinage of competent beds produced mélange between slices. Shear surfaces and the original bed-parallel fissility of the shale both contribute to the anastomosing fabric of the mélange matrix.A subsequent folding event of probable Acadian age produced upright to moderately inclined F2 folds with axial-plane cleavage increasing in intensity eastwards across the allochthon. This event refolded the folds, thrust slices, and mélange zones produced during emplacement. Later, gentle cross folds, associated with sporadic development of crenulation cleavage, produced culminations and depressions on the F2 fold hinges.
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Lacombe, Olivier, Laurent Jolivet, Laetitia Le Pourhiet, Emmanuel Lecomte, and Caroline Mehl. "Initiation, geometry and mechanics of brittle faulting in exhuming metamorphic rocks: insights from the northern Cycladic islands (Aegean, Greece)." Bulletin de la Société Géologique de France 184, no. 4-5 (2013): 383–403. http://dx.doi.org/10.2113/gssgfbull.184.4-5.383.

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AbstractInitiation, geometry and mechanics of brittle faulting in exhuming metamorphic rocks are discussed on the basis of a synthesis of field observations and tectonic studies carried out over the last decade in the northern Cycladic islands. The investigated rocks have been exhumed in metamorphic domes partly thanks to extensional detachments that can be nicely observed in Andros, Tinos and Mykonos. The ductile to brittle transition of the rocks from the footwall of the detachments during Aegean post-orogenic extension was accompanied by the development of asymmetric sets of meso-scale low-angle normal faults (LANFs) depending on the distance to the detachments and the degree of strain localization, then by conjugate sets of high-angle normal faults. This suggests that rocks became progressively stiffer and isotropic and deformation more and more coaxial during exhumation and localization of regional shearing onto the more brittle detachments. Most low-angle normal faults result from the reactivation of precursory ductile or semi-brittle shear zones; like their precursors, they often initiate between or at the tips of boudins of metabasites or marbles embedded within weaker metapelites, emphasizing the role of boudinage as an efficient localizing factor. Some LANFs are however newly formed, which questions the underlying mechanics, and more generally rupture mechanisms in anisotropic rocks. The kinematics and the mechanics of the brittle detachments are also discussed in the light of recent field and modeling studies, with reference to the significance of paleostress reconstructions in anisotropic metamorphic rocks.
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Goscombe, Ben D., Cees W. Passchier, and Martin Hand. "Boudinage classification: end-member boudin types and modified boudin structures." Journal of Structural Geology 26, no. 4 (2004): 739–63. http://dx.doi.org/10.1016/j.jsg.2003.08.015.

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MALATESTA, C., L. FEDERICO, L. CRISPINI, and G. CAPPONI. "Fluid-controlled deformation in blueschist-facies conditions: plastic vs brittle behaviour in a brecciated mylonite (Voltri Massif, Western Alps, Italy)." Geological Magazine 155, no. 2 (2017): 335–55. http://dx.doi.org/10.1017/s0016756816001163.

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AbstractA blueschist-facies mylonite crops out between two high-pressure tectono-metamorphic oceanic units of the Ligurian Western Alps (NW Italy). This mylonitic metabasite is made up of alternating layers with different grain size and proportions of blueschist-facies minerals.The mylonitic foliation formed at metamorphic conditions of T = 220–310 °C and P = 6.5–10 kbar. The mylonite shows various superposed structures: (i) intrafoliar and similar folds; (ii) chocolate-tablet foliation boudinage; (iii) veins; (iv) breccia.The occurrence of comparable mineral assemblages along the foliation, in boudin necks, in veins and in breccia cement suggests that the transition from ductile deformation (folds) to brittle deformation (veining and breccia), passing through a brittle–ductile regime (foliation boudinage), occurred gradually, without a substantial change in mineral assemblage and therefore in the overall P–T metamorphic conditions (blueschist-facies).A strong fluid–rock interaction was associated with all the deformative events affecting the rock: the mylonite shows an enrichment in incompatible elements (i.e. As and Sb), suggesting an input of fluids, released by adjacent high-pressure metasedimentary rocks, during ductile deformation. The following fracturing was probably enhanced by brittle instabilities arising from strain and pore-fluid pressure partitioning between adjacent domains, without further external fluid input.Fluids were therefore fixed inside the rock during mylonitization and later released into a dense fracture mesh that allowed them to migrate through the mylonitic horizon close to the plate interface.We finally propose that the fracture mesh might represent the field evidence of past episodic tremors or ‘slow earthquakes’ triggered by high pore-fluid pressure.
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SARTINI-RIDEOUT, C., J. A. GILOTTI, and W. C. McCLELLAND. "Geology and timing of dextral strike-slip shear zones in Danmarkshavn, North-East Greenland Caledonides." Geological Magazine 143, no. 4 (2006): 431–46. http://dx.doi.org/10.1017/s0016756806001968.

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The North-East Greenland eclogite province is divided into a western, central and eastern block by the sinistral Storstrømmen shear zone in the west and the dextral Germania Land deformation zone in the east. A family of steep, NNW-striking dextral mylonite zones in the Danmarkshavn area are geometrically and kinematically similar to the ductile Germania Land deformation zone, located 25 km to the east. Amphibolite facies deformation at Danmarkshavn is characterized by boudinage of eclogite bodies within quartzofeldspathic host gneisses, pegmatite emplacement into the boudin necks and subsequent deformation of pegmatites parallel to gneissosity, a widespread component of dextral shear within the gneisses, and localization of strain into 10–50 m thick dextral mylonite zones. The gneisses and concordant mylonite zones are cut by a swarm of weakly to undeformed, steeply dipping, E–W-striking pegmatitic dykes. Oscillatory-zoned zircon cores from two boudin neck pegmatites give weighted mean 206Pb/238U sensitive, high mass resolution ion microprobe (SHRIMP) ages of 376 ± 5 Ma and 343 ± 7 Ma. Cathodoluminescence images of these zircons reveal complex additional rims, with ages from ranging from c. 360 to 320 Ma. Oscillatory-zoned, prismatic zircons from two late, cross-cutting pegmatites yield weighted mean 206Pb/238U SHRIMP ages of 343 ± 5 Ma and 332 ± 3 Ma. Zircons from the boudin neck pegmatites record a prolonged growth history, marked by fluid influx, during amphibolite facies metamorphism beginning at c. 375 Ma. The cross-cutting pegmatites show that dextral deformation in the gneisses and ductile mylonite zones had stopped by c. 340 Ma. Ultrahigh-pressure metamorphism in the eastern block at 360 Ma requires that the Greenland Caledonides were in an overall contractional plate tectonic regime. This, combined with 20% steep amphibolite facies lineations in the eclogites, gneisses and mylonites suggests that dextral transpression may have been responsible for a first stage of eclogite exhumation between 370 and 340 Ma.
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Soyer, C., and P. Tricart. "Tectonique d'inversion en Tunisie centrale; le chainon atlasique Segdal-Boudinar." Bulletin de la Société Géologique de France V, no. 4 (1989): 829–36. http://dx.doi.org/10.2113/gssgfbull.v.4.829.

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El Ouahabi, Fatima Zahra, Simona Saint Martin, Jean-Paul Saint Martin, Abdelkhalak Ben Moussa, and Gilles Conesa. "Les assemblages de diatomées du bassin messinien de Boudinar (Maroc nord-oriental)." Revue de Micropaléontologie 50, no. 2 (2007): 149–67. http://dx.doi.org/10.1016/j.revmic.2007.02.004.

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Dissertations / Theses on the topic "Boudins; Boudinage"

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Kharrim, Mohammed Rida. "Pectinides du néogène du bassin de Boudinar (Rif oriental, Maroc)." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37606561d.

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Kharrim, Mohammed Rida. "Pectinides du néogène du bassin de Boudinar (Rif oriental, Maroc)." Lyon 1, 1987. http://www.theses.fr/1987LYO11756.

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Les pectinides du neogene du bassin de boudinar offrent une grande variete d'especes et une grande richesse de populations. Ils se repartissent entre le tortonien terminal et le pliocene, mais c'est le messinien qui fournit les faunes les plus interessantes. On decrit les coupes les plus representatives de la serie neogene pour situer les pectinides a travers les differents facies et leurs variations laterales. La description morphologique des differentes especes constitue l'essentiel du travail, avec analyses comparatives methodiques et figuration. Ensuite, on tire des syntheses paleobiogeographiques dont la portee s'etend a toute la mediterranee mais eclaire surtout le messinien du domaine alboran. Meme pour les resultats biostratigraphiques et paleoecologiques
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Abbassi, Hassan el. "Essai sur la dynamique des milieux dans le bassin de Boudinar (Rif oriental, Maroc)." Lille 3 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376020256.

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Soyer, Christian. "Inversions structurales le long de la direction atlasique en Tunisie centrale le Jebel Boudinar /." Phd thesis, Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37610054h.

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Abbassi, Hassan el. "Essai sur la dynamique des milieux dans le bassin de boudinar (rif oriental, maroc)." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR10007.

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Le potentiel morphogenique dans le bassin de boudinar est important, il se caracterise par des conditions structurales complexes associant une tectonique active et des formations lithologiques peu resistantes, un climat irregulier et agressif et des densites humaines tres elevees. L'evolution morphopedologique quaternaire se traduit dans la montagne par plusieurs types de versants qui se distinguent par leurs profils et leurs couvertures detritiques superficielles. Celles-ci appartiennent pour la plupart au quaternaire moyen et recent; elles portent la marque du froid. Dans le piedmont les niveaux d'ablation et les terrasses alluviales sont tres etendus. Ils portent des formations differentes: des depots detritiques grossiers a la base des terrasses, des croutes et des encroutements calcaires, des paleosols. . L'analyse morphodynamique a necessite le decoupage du bassin versant en plusieurs type de milieux correspondant a des unites terretoriales differentes. Dans la montagne, l'exposition des versants joue un role determinant dans le classement des milieux. Ceux-ci sont constitues par: des versants humides evoluant par le ravinement et les mouvements de masse ils constituent des zones de sources de sediments. -des versants secs et chauds faconnes par le ruissellement diffus et se comportent en surface de concentration des eaux. Dans le piedmont l'agencement des unites morphopelogiques constitue le critere fiable pour classer les milieux. La dynamique morphogenique se manifeste essentiellement sur les versants ; elle prend des aspects differents en fonction des conditions locales: formations superficielles, substrat, occupation humaine etc. . L'etude a debouche sur des propositions pour l'amenagement rationnel du territoire
The boudinar basin, situed in the rif mountains of northeast marocco, have a high morphodynamic potentiel. The quaternary morphopedological evolution shaws in the mountain several types of slopes having a different profils and superficial deposits these formations are composed by a layers of angular stones prepared by gelefraction processes, calcarous crust,red sandy and silty formationand greyish soils. We have dated these formations from tensiftien, soltanien and rharbien (medium and recent quat. In the pedimont plain, the quaternary morphopedological heritage is constituted by a larges planes (pediments. . ),and a number of fluvial terraces often coverd with a thick paleosoil. These forms are - attributed to the moulouyen, saletieh, amerien, tensiftien, soltanien and rharbien. (old, medium and recent quaternary. ). The morphodynamic analysis made necessary to devide the catchment into a number unites: in the mountain, slope exposition allow to distinguish the following milieus: -humid slopes exposed to w. N. W-n. N. E. , arec caracterised by a high agricultural potentiel, human densities and a thick formation cover. The morphodynamic is marked by gullying and mass mouvements. These processes are related the soil properties (atterberg limites, aggregate stability, infiltration, mineralogy composition etc. ) and anthropic activity(cultivation, grazing. . . ). - the slopes exposed to w. S. W-e. S. E. (semi-arid and subarid climate) are coverd with a poorly remnants red soils; human presence is very localised. Their surface is affected by rill wash. In pedimont several milieus are caracterised in relation with the quaternary morphological unites. The recent evolution is marked by rill and sheet wash on the convexities, v-shaped gullies cut into remnants of colluvial red soils dated from recent solanien, gullies associated with piping phenomenain marls, parallel gullies into pliocene materialet. . . The mass mouvements are rares. All these forms are related to the soils and formations properties (physical and chimical composition) and human activity. In the end many propositions are formuled in order to solve erosion problems. .
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El, Kharim Younès. "Sédimentologie et palynologie du néogène du bassin de Boudinar : implications paléogéographiques et paléoclimatiques (Rif nord-oriental, Maroc)." Lyon 1, 1990. http://www.theses.fr/1990LYO10182.

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La serie miocene correspond au remplissage synsedimentaire d'un graben neotectonique suivant les accidents ne-sw et nw-se. La nature des galets, de la fraction sableuse, la nature mineralogique des argiles tout comme le sens des courants indiquent que le materiel depose est d'origine proche et que le transit s'effectue selon les directions transversales. La subsidence tectonique l'emporte sur l'accretion sedimentaire. L'etude palynologique de la coupe d'irachamen apporte des informations preliminaires sur la flore, l'environnement paleogeographique et le climat du messinien. L'analyse des spectres polliniques revele la perennite du climat chaud relativement sec avec neanmoins une legere humidite a la base et une ralative aridite a l'extreme sommet du messinien. Une comparaison avec l'etude des mineraux argileux d'une part et avec les travaux palynologiques sur la mediterranee occidentale confirme les conditions climatiques et ecologiques regnantes au messinien
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Barhoun, Nadia. "Les foraminifères planctoniques du néogène du bassin de Boudinar (Rif nord-oriental, Maroc) : biostratigraphie, systématique et paléoécologie." Lyon 1, 1991. https://tel.archives-ouvertes.fr/tel-01998644/document.

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Les foraminifères planctoniques du Néogène du bassin de Boudinar (NE du Maroc) montrent une grande richesse en espèces et en individus. Ils offrent un matériel intéressant pour une étude bio stratigraphique, systématique et paléoécologique. Soixante quatre espèces ont été déterminées et étudiées. La description morphologique de chaque espèces est complétée par des données d'ordre stratigraphique, géographique et écologique. L’étude bio stratigraphique de la série néogène de ce bassin, basée sur ces organismes, a permis d'une part de distinguer de nouvelles sous-zones et d'autre part de préciser certaines limites (la limite Tortonien-Messinien et la limite Mio-Pliocène) et de les caractériser par un ensemble de bio-évènements. Les données de l’étude systématique sont ensuite associées aux résultats quantitatifs, semi-quantitatifs et qualitatifs obtenus à partir des comptages et complétées par les renseignements fournis par le rapport planctono-benthique (p/p+b). L 'analyse paléoécologique des assemblages à foraminifères planctoniques révèle que ceux-ci se différencient notamment en fonction de la profondeur, de la température et de la salinité. L’étude détaillée de ces assemblages dans plusieurs coupes met également en évidence une instabilité dans l'épaisseur de la tranche d'eau dans le bassin de Boudinar au cours du Messinien. Les considérations précédentes développées ont enfin permis d'aborder l'aspect paléogéographique et de replacer les assemblages étudiés dans leur contexte méditerranéen et néogène.
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Books on the topic "Boudins; Boudinage"

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Sédimentologie et palynologie du Néogène du bassin de Boudinar: Implications paléographiques et paléoclimatiques (Rif nord oriental, Maroc). Centre des sciences de la terre, Université Claude Bernard, 1991.

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Conference papers on the topic "Boudins; Boudinage"

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Mertineit, Michael, Michael Schramm, Gernold Zulauf, Hartmut Blanke, and Mario Patzschke. "Mineralogical-Geochemical Characteristics of Boudin Neck Infill of a Boudinaged Permian Rocksalt/Anhydrite Association (Morsleben Site, Germany)." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1786.

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