Дисертації з теми "Crustal tectonics"
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Travan, Gaia. "Interactions between salt tectonics and crustal tectonics in the Mediterranean and in the Barents sea." Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILR050.
Повний текст джерелаConsidering geological times, the behaviour of the salt can be approximated to a Newtonian fluid (i.e. viscous behaviour) compared to the brittle behaviour of the surrounding rocks, and their interaction can be modelled through scaled analogue models of a viscous material and a brittle one, e.g. silicone and sand. Crustal tectonics, both extensional and contractional, have often a fundamental role in the evolution of the salt structures, and becomes the main cause of deformation in many study areas. The aim of this thesis is to analyze the timing and mechanisms of salt tectonics in three study area characterized by different salt ages and increasing influence of crustal tectonics on the salt tectonics processes: the Western Sardinian and Northern Algerian margin (Western Mediterranean) and the Sørvestsnaget Basin (Southwestern Barents Sea). This has been done through the interpretation of 2D and 3D seismic reflection data from TGS (Norway), OGS (Italy) and UMR Geo-Ocean (France), as well as through the integration with other geophysical data, wells data and the comparison with analogue models. In the W-Mediterranean the salt deposited during the Salinity Crisis (5.6 Ma) so salt tectonics is relatively young, the overburden is thin and the marks of the first stages of deformation are usually imaged. On the W-Sardinian margin the salt structures are mainly consequence of the basinward slope of the salt base, resulting from the differential subsidence after the refilling of the Mediterranean at the end of the crisis. Moving towards the center of the Sardo-Provencal basin, where the sedimentary load of the Rhone Deep Sea Fan forms a thick salt overburden, gravity spreading dominates. While in this area there is no influence of crustal tectonics on salt deformation at a regional scale, we recognized on the SW-Sardinian margin the presence of a flower structure active during Pliocene. We propose it to be part of the North Balearic Fracture Zone, i.e. the dextral strike-slip fault of the Sardo-Provençal basin opening, never recognized in the area.The southern sector of the Western Mediterranean is reactivated in compression since 8 Ma due to the Africa-Europe convergence, and this compression is expressed through thrusts on the Algerian margin. Here salt tectonics is mainly the consequence of crustal tectonics, and in particular of the increased potential energy consequence of the localized uplift. The analogue models produced show that the uplift of the plateau is at the origin of the lateral thickness variations in the salt layer and of the polygonal minibasins formation in the area offshore Algiers. A component of gravity gliding related to the basin subsidence is present.The third study area is the Sørvestsnaget Basin in the SW Barents Sea. Here the Permian salt formed structures that are the result of hundreds of millions years of deformation, mainly through reactive and active salt diapirism consequence of the Mesozoic extensional tectonics due to the Atlantic Ocean opening. This lead to the formation of massive allochthonous salt structures and locally to their deflation. After the end of the crustal extension, the main influence on the salt deformation is attributable to the Quaternary glacial sedimentary wedge and the consequent glacio-isostatically controlled crustal movements, leading to internal redistribution in the allochthonous salt structures. Part of the hypothesis on the salt tectonics mechanisms in the Sørvestsnaget basin were confirmed through analogue modelling.Thanks to the diversity between the three study areas in terms of geological setting, we offer not only a broad picture of different levels of interaction between salt and crustal tectonics, but also of the effect of salt basal slope and differential sedimentary load on the salt structures evolution, as well as different levels of maturity of salt structures, from the younger ones (e.g. salt rollers) to the more mature ones (e.g. salt sheets)
Cragg, Ian Alan. "Numerical modelling of crustal scale fault propagation." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321166.
Повний текст джерелаRayson, Martin W. "Computer aided design of geodetic networks for monitoring crustal tectonics." Thesis, University of Newcastle Upon Tyne, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278767.
Повний текст джерелаGordon, Andres Cesar. "Arquitetura crustal da bacia de Almada no contexto das bacias da margem lesste da América do Sul." Universidade do Estado do Rio de Janeiro, 2011. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=2446.
Повний текст джерелаThe Almada Basin, located in the Bahia State, shares similar characteristics with other eastern Brazilian basins when analyzed in terms of major sedimentation process and dominant stress regime. However, a remarkably different composition of the transitional crust is observed when this basin is compared with the other eastern Brazilian basins. A large 3D survey, acquired with cable length of 6 km and 9.2 seconds resulted in good seismic images of the rift deep structure. A detailed gravity survey and 2D forward modeling were integrated with the seismic analysis to corroborate the geological model. The Almada Basin is part of the continental rift system that developed during the Berriasian to Aptian times, heralding the Gondwana break up. Subsequently the basin evolved into a passive divergent margin. The rifting process results in five NNE-SSW striking half-graben sub-basins, from onshore to deep water, producing a complex structural framework. Deep seismic profiles reveal the progressive thinning of the continental crust down to 5 km below the easternmost half-graben with a crustal β factor of 7 before the ocean crust developed. The good-quality seismic images also allowed the recognition of major listric faults systems that cut the upper crust, linking the half-grabens and detaching along the layered lower crust. The basin shows an asymmetrical crustal profile compatible with a simple shear rifting mechanism. Volcanic Margins (VM) and Non Volcanic Margins (NVM) are the end members of the crustal compositional analysis of divergent continental margins. The key architectural elements of the VM, such as large igneous provinces, seaward dipping reflectors and the basinal synrift magmatism, are not recognized in the Almada Basin. Even though the South Atlantic divergent margin is traditionally interpreted as a VM, particularly in the rift segment south of Bahia State, the lack of these key elements, as well as drilling results, indicate a non volcanic character for the Almada segment. Regionally, the South American divergent margin is mostly volcanic, but the amount and the influence of the magmatism during the rift phase is variable from the southernmost Austral Basin in south Argentina up to the Pernambuco Basin in northeast Brazil. Along the whole continental margin different segments of strong, medium and non volcanic character can be recognized. In the classical NVM, the transitional crust is highly stretched and, in some cases, it shows evidence of exhumed sub continental mantle (e.g., Iberian margin). In the Almada Basin, the transitional crust indicates a considerable thinning, but there is no clear evidence of mantle exhumation. The mechanisms responsible for the generation and emplacement of the large amounts of magma recorded in the divergent margins are still subject to discussions. Along the South American segments, both the lithospheric thinning and mantle plume models have been proposed. Alternatively, a combination of these two mechanisms may have played an important role in the margin evolution.
Gilbert, John Bennett. "Crustal Deformation During Arc-Flare Up Magmatism: Field And Microstructural Analysis Of A Mid-Crustal, Melt Enhanced Shear Zone." ScholarWorks @ UVM, 2017. http://scholarworks.uvm.edu/graddis/699.
Повний текст джерелаChan, Yau-cheong Ian, and 陳有昌. "Characterizing crustal melt episodes in the Himalayan orogen." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/206505.
Повний текст джерелаpublished_or_final_version
Applied Geosciences
Master
Master of Science
Lawson, N. Kate. "Crustal accretion near ridge-transform intersections : Kane fracture zone, mid-Atlantic ridge." Thesis, Durham University, 1996. http://etheses.dur.ac.uk/1157/.
Повний текст джерелаLeftwich, Timothy E. "Geopotential investigations of the crustal structure and evolution of Mars." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1147893346.
Повний текст джерелаDilles, Zoe Y. G. "Geochronologic and Petrologic Context for Deep Crustal Metamorphic Core Complex Development, East Humboldt Range, Nevada." Scholarship @ Claremont, 2016. http://scholarship.claremont.edu/scripps_theses/811.
Повний текст джерелаWightman, R. T. "Constraints on crustal development and tectonics in the Archaean rocks of south India." Thesis, Open University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374494.
Повний текст джерелаGudmundsson, M. T. "The crustal structure of the subglacial Grimsvotn Volcano, Vatnajokull, Iceland, from multiparameter geophysical surveys." Thesis, University College London (University of London), 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342375.
Повний текст джерелаTsoumakos, Petros E. "Interpretation of a seismic survey of crustal structure in western Scotland and the Hebrides." Thesis, University of Glasgow, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236701.
Повний текст джерелаOpare-Addo, Emmanuel. "Aspects of Early Proterozoic granitoids and migmatites in southern Ghana : implications for crustal evolution." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240966.
Повний текст джерелаMoore, James D. P. "Viscoelastic modelling of crustal deformation." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:6e73f2e2-a8f7-4790-8f13-f562d50302a9.
Повний текст джерелаSwenson, Jennifer Lyn. "Broadband regional waveform modeling to investigate crustal structure and tectonics of the central Andes." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/282873.
Повний текст джерелаBurkett, Corey A. "LATE QUATERNARY CRUSTAL DEFORMATION AT THE APEX OF THE MOUNT MCKINLEY RESTRAINING BEND OF THE DENALI FAULT, ALASKA." UKnowledge, 2014. http://uknowledge.uky.edu/ees_etds/25.
Повний текст джерелаMcFarland, Phillip K., Richard A. Bennett, Patricia Alvarado, and Peter G. DeCelles. "Rapid Geodetic Shortening Across the Eastern Cordillera of NW Argentina Observed by the Puna-Andes GPS Array." AMER GEOPHYSICAL UNION, 2017. http://hdl.handle.net/10150/626449.
Повний текст джерелаLeftwich, Timothy E. "Geophysical investigations of the crustal structure and evolution of Mars." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1147893346.
Повний текст джерелаGuntoro, Agus. "Tectonic evolution and crustal structure of the Central Indonesian Region : from geology, gravity and other geophysical data." Thesis, University College London (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307471.
Повний текст джерелаJaafar, Rani Gomez Francisco Gustavo. "GPS measurements of present day crustal deformation within the Lebanese Restraining Bend along the Dead Sea Transform." Diss., Columbia, Mo. : University of Missouri--Columbia, 2008. http://hdl.handle.net/10355/6288.
Повний текст джерелаWharton, Mark R. "Crustal accretion during the earliest stages of intra-oceanic arc volcanism : examples from Fiji and Tonga, SW Pacific." Thesis, Durham University, 1993. http://etheses.dur.ac.uk/1616/.
Повний текст джерелаTakahashi, Atsushi. "Hierarchical Cluster Analysis of Dense GNSS Data and Interpretation of Cluster Characteristics." Kyoto University, 2019. http://hdl.handle.net/2433/244510.
Повний текст джерелаAlvarado, Patricia Monica. "Crustal Seismicity in the Back-Arc Region of the Southern Central Andes from Historic to Modern Times." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/195537.
Повний текст джерелаNnange, Joseph Metuk. "The crustal structure of the Cameroon Volcanic Line and the Foumban Shear Zone based on gravity and aeromagnetic data." Thesis, University of Leeds, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305782.
Повний текст джерелаPapapavlou, Konstantinos. "Petrochronology and mineral chemistry of mid-crustal shear zones : new tools for tectonics and mineral exploration." Thesis, University of Portsmouth, 2017. https://researchportal.port.ac.uk/portal/en/theses/petrochronology-and-mineral-chemistry-of-midcrustal-shear-zones(e59893a5-5079-43b8-8dfd-b83e207b5097).html.
Повний текст джерелаMoore, Nicole E. DeBari Susan M. "Origin and geochemical evolution of mafic magmas from Mount Baker in the northern Cascade arc, Washington : probes into mantle and crustal processes /." Online version, 2010. http://content.wwu.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=345&CISOBOX=1&REC=14.
Повний текст джерелаRandall, Darren Edward. "A palaeomagnetic study of crustal rotations and their relationship to the tectonics of the Atacama and Domeyko fault systems, northern Chile." Thesis, University of Plymouth, 1996. http://hdl.handle.net/10026.1/1728.
Повний текст джерелаVan, Avendonk Hermanus Josephus Antonius. "An investigation of the crustal structure of the Clipperton transform fault area using 3D seismic tomography /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1998. http://wwwlib.umi.com/cr/ucsd/fullcit?p9823314.
Повний текст джерелаParks, Jane Elizabeth. "Crustal evolution of Grenville terranes in the central and southern Appalachians : the Pb isotope perspective for Grenville tectonics /." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06162009-063235/.
Повний текст джерелаCook, Kristen Lee. "The development of orogenic plateaus : Plateaus: case studies examining relationships between tectonics, crustal strength, surface deformation, and plateau morphology." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45769.
Повний текст джерелаIncludes bibliographical references.
This thesis addresses processes associated with the uplift, deformation, and erosion of orogenic plateaus. The timing and mechanisms of uplift of the Tibetan Plateau and the Altiplano are the subject of ongoing debate. Central issues include the strength of the lower crust and the role of lower crustal flow, the relative importance of continuous deformation versus block deformation, and the possibility of lithospheric delamination. The goal of this thesis is to further explore several of these issues using a combination of numerical modeling, field observations, and thermochronology. I investigate controls on the large-scale evolution of the Tibetan Plateau and the Altiplano using a new quasithree-dimensional viscous flow model that allows for both the development of a weak lower crust and lateral and temporal viscosity variations. Modeling motivated by the Tibetan Plateau shows that lateral variations in crustal strength can have a significant effect on surface velocities throughout the plateau, as well as on the location, shape, and slope of plateau margins and the overall plateau morphology. Model results suggest that crustal strength heterogeneities may be responsible for a number of seemingly unrelated aspects of Tibetan Plateau morphology and deformation. Modeling motivated by the Altiplano explores the relationship between subduction angle, the strength of the lower crust, crustal thickening, and surface shortening in the Central Andes. Model results illustrate that lower crustal flow above regions of steep-slab subduction can redistribute material along strike and can explain discrepancies between surface shortening and crustal thickness in the northern and southern Altiplano. I address the distribution of Middle Cenozoic deformation on the eastern margin of the Tibetan Plateau by using field observations and thermochronology to document an episode of extension and constrain its timing to the Oligocene. Finally, I examine the response of a major river system to flow over an abrupt plateau margin by using topographic data, cosmogenic nuclide dating, and numerical modeling to describe the incision history of the Colorado River into the southwestern Colorado Plateau.
by Kristen Lee Cook.
Ph.D.
Willis, Michael J. "Crustal motion in the Antarctic interior from a decade of global positioning system measurements." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1198348880.
Повний текст джерелаWijns, Christopher P. "Exploring conceptual geodynamic models : numerical method and application to tectonics and fluid flow." University of Western Australia. School of Earth and Geographical Sciences, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0068.
Повний текст джерелаHull, Angela Lynn. "Geochronology and thermochronology of Precambrian basement drill core samples in Nebraska and southeastern South Dakota." Kent State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=kent1385078311.
Повний текст джерелаTozer, Brook. "Crustal structure, gravity anomalies and subsidence history of the Parnaíba cratonic basin, Northeast Brazil." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:90ce8bb0-e55d-4b3c-87e1-aab60084ef42.
Повний текст джерелаSalazar, Reinoso Pablo [Verfasser]. "The upper crustal microseismicity image from the North Chilean subduction zone : implications for tectonics and fluid migration / Pablo Salazar Reinoso." Berlin : Freie Universität Berlin, 2011. http://d-nb.info/1025511484/34.
Повний текст джерелаSkipton, Diane. "Paleoproterozoic Metamorphism, Deformation and Exhumation of Mid-Crustal Rocks of the Trans-Hudson Orogen on Hall Peninsula, Baffin Island." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35291.
Повний текст джерелаParent, Andrew Michael. "Pre-Mt. Simon Seismic Sequences Below West-Central Indiana: Local Interpretation and Regional Significance." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright149606295325976.
Повний текст джерелаWiemer, Daniel. "Tectonic evolution of the Early Archaean Doolena Gap Greenstone Belt, East Pilbara Terrane, Western Australia." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/102985/1/Daniel_Wiemer_Thesis.pdf.
Повний текст джерелаBenavente, Escobar Carlos Lenin. "Neogene tectonic and exhumation of the Andes Centrales, Southern Peru." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAU021/document.
Повний текст джерелаABSTRACTTiming and mechanisms of uplift in the Central Andes have been a matter of debate since at least the 1970’s. Our study focuses on Cenozoic deformation and exhumation of the Central Andean forearc in Peru, in Cuzco region, and between the Western Cordillera and the Coastal Cordillera in Nazca region. Our new mapping of active faults provides new insights into the Cenozoic to present-day crustal deformation of the Central Andean Western margin. Until now, apart from some local studies, the geomorphology of the Andean forearc has classically been presented as a remnant Miocene landscape with no significant active structures accommodating the Cenozoic deformation. Thanks to new high-resolution optical imagery, the well-preserved geomorphic surfaces developed within the forearc of southern Peru provide excellent regional markers to map patterns of deformation. Pertaining to the Cenozoic history, while the timing of uplift-related exhumation and Cenozoic exhumation has been studied in Colca and Cotahuasi canyons, it remain poorly constrained in the northern segment of the Central Andean forearc. I report new apatite (U–Th)/He (AHe) and fission track (AFT) ages from the western Cordillera between Cañete and Nazca along two new cross sections. The ages in Nazca region reflect relatively recent (since ~10Ma) relief creation along the western margin of the Altiplano, similar to what is described south in Colca region.The Quaternary tectonic history is revealed by the newly mapped fault segments affecting the Miocene deposits within forearc. Through field and remote mapping, I determined fault geometries and maximum ages for the activity of the faults systems based on stratigraphic relationships in order to assess the role of this tectonic activity in the Western Cordillera uplift and exhumation.To understand the Holocene tectonic history, we use in situ produced 10Be to determine the exposure ages of the free face and tectonic scarp of the Purgatorio Fault in order to map the temporal evolution of its seismotectonic activity. Our new results display evidence of transpression and the formation of meter-high coseismic scarps as well as very recent exposure ages indicating a youthful fault morphology and Mw6-7 earthquakes occurring along the Purgatorio fault segments. These new data are in contrast with some previous conclusions for this region which suggest extension and/or slow rates of deformation for this region and time period. Further, these new data not only suggest significant active deformation within the forearc, but also highlight a potential seismic hazard for the region that not take into account crustal forearc faults.While the general assumption is that active deformation is localized in the Subandean fold and thrust belt, or east of the Western Cordillera in the Altiplano, our data support a model where active deformation is occurring in the western margin as well, along the Incapuquio Fault and other neotectonic faults that accommodates the partitioning of the subduction oblique convergence.These crustal active faults and more precisely the “not migrating to the trench” Incapuquio fault zone reveal the rigid motion of the forearc. Our new model is nevertheless compatible with the recently published GPS data that measure a southeastward movement at 4–5 mm/yr relative to a stable South America reference frame. This rigid motion is in part due to the presence of the rigid Greenvillian accreted craton, that behave as a sliver, and rather tilt than deform through time
Cesin, Gina Lee. "The Application of Electrical Resistivity and Microgravity to Locate Tunnels along the U.S.-Mexico Border at Calexico." TopSCHOLAR®, 2008. http://digitalcommons.wku.edu/theses/44.
Повний текст джерелаJohnson, Julie A. "A Geochemical Study of Crustal Plutonic Rocks from the Southern Mariana Trench Forearc: Relationship to Volcanic Rocks Erupted during Subduction Initiation." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1249.
Повний текст джерелаYang, Jiaming. "Melting in the Mantle Wedge: Quantifying the Effects of Crustal Morphology and Viscous Decoupling on Melt Production with Application to the Cascadia Subduction Zone." PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/3880.
Повний текст джерелаMarsh, Nicola A. "The influences of crustal extension, salt tectonics and gravity-driven deformation on the structural evolution of the Halten Terrace, offshore mid-Norway : new sights from 3D seismic data and fault analysis." Thesis, Durham University, 2008. http://etheses.dur.ac.uk/1933/.
Повний текст джерелаBassett, Daniel Graham. "The relationship between structure and seismogenic behaviour in subduction zones." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:dd284a79-d94a-4732-8dec-cb38c78fca73.
Повний текст джерелаMissenard, Yves. "Le relief des Atlas Marocains : contribution des processus asthénosphériques et du raccourcissement crustal, aspects chronologiques." Phd thesis, Université de Cergy Pontoise, 2006. http://tel.archives-ouvertes.fr/tel-00125775.
Повний текст джерелаlimite de plaque Afrique-Europe.
Le raccourcissement crustal est le deuxième mécanisme à l'origine du relief de cette chaîne. Une analyse structurale sur la base des données de terrain dans le Haut Atlas de Marrakech nous a permis de montrer l'existence d'une stratigraphie mécanique contrastée. Plusieurs niveaux de décollements potentiels y sont identifiés en particulier dans le Viséen, le Cambrien, le Trias et le Sénonien. L'héritage complexe de cette région, située à la limite entre les rifts Triasico-Liasiques Atlantique et Téthysien, contrôle leur activation sur les bordures de la chaîne. Celle-ci entraîne la formation de structures variées : zones triangulaires, plis secondaires (« rabbit ears »), imbrications. Un groupe basal rigide est distingué. Il inclut le Précambrien, et localement le Paléozoique et le Trias. Une coupe complète de la
chaîne est présentée.
La chronologie de la déformation et l'âge de l'amincissement de la lithosphère sous la chaîne sont finalement discutés. Une analyse détaillée de la géologie de l'avant-pays sud du Haut Atlas de Marrakech est combinée aux résultats obtenus par comptage de traces de fissions pour proposer un scénario d'évolution. Une première phase de raccourcissement est identifiée à l'Eocène Supérieur – Oligocène. Au Miocène Inférieur – Moyen, la lithosphère est amincie et une phase de dénudation affecte l'ensemble de la chaîne et son avant-pays. Enfin, une dernière phase de raccourcissement a lieu au Plio-Quaternaire.
Maurin, Thomas. "Impact de la ride 90°E et du flux crustal Est-Tibétain sur l'évolution récente de la subduction oblique Indo-Birmane : approche géologique, sismique et géodésique." Phd thesis, Université Paul Cézanne - Aix-Marseille III, 2009. http://tel.archives-ouvertes.fr/tel-00425058.
Повний текст джерелаLe long d'une large coupe Terre-Mer depuis le bassin du Bengale jusqu'au Nord de la Birmanie, je me suis intéressé à la géométrie structurale et à la cinématique de la subduction hyper-oblique Indo-Birmane en insistant sur les effets d'éléments perturbateurs (flux et hétérogénéités crustaux). Par une approche pluridisciplinaire combinant des observations géologiques structurales de terrain, des données géophysiques marines et des mesures géodésiques, je présente un modèle d'évolution néogène de la subduction oblique en réponse à ces perturbations. Une étude de la sismicité et quelques mesures paléomagnétiques ont complété ce travail.
La ride de 90°E, formée au sein de la croûte océanique du Bengale vers 100Ma, est entrée en collision avec la marge Birmane au Miocène supérieur. Elle a probablement bloqué la subduction dans sa partie méridionale de telle sorte que seule une déformation décrochante dextre le long de son flanc Est est exprimé structuralement. Au Nord de la ride, le prisme externe Indo-Birman est libre de se développer rapidement vers l'Ouest depuis 2Ma à la faveur d'une forte épaisseur de sédiments déposés sur la plaque plongeante (delta du Ganges-Brahmapoutre).
Ce prisme Indo-Birman, construit en convergence hyper-oblique, a enregistré un partitionnement de la déformation : les zones internes sont cisaillées sur une direction Nord-Sud et les zones externes sont raccourcies sur une direction Est-Ouest.
La faille de Sagaing est défléchie de plus de 100km vers l'Ouest dans sa partie Nord. Je propose un modèle dans lequel le flux crustal résultant de l'effondrement du Tibet, est responsable de cette inflexion. Ce modèle questionne le rôle de ce flux dans la construction du prisme partitionné. Appuyé sur l'ensemble des données géodésiques disponibles autour de la syntaxe Est Himalayenne, il établit un lien entre les déformations finis néogènes de la région.
Les données de sismique réflexion ont apporté des contraintes fortes sur la partie marine de la section. Ainsi, la présence de la ride de 90°E et la nature océanique de la croûte du Bengale ont pu être fixées. En revanche, le flux crustal Est-Tibétain reste mal compris. Les données géodésiques permettent d'en approcher la cinématique mais il est nécessaire, pour en connaître la nature, d'y combiner des données géologiques de terrain, qui sont les seuls à permettre l'observation direct de la déformation crustale profonde aujourd'hui exhumée. Ces observations géologiques peuvent aussi apporter des éléments de réponses sur la stabilité du flux au cours du temps. Un travail de modélisation doit encore être mené pour confronter ces idées nouvelles aux propriétés physiques de la lithosphère continentale en cours de déformation.
Karakas, Ozge. "Modulation of crustal magmatic systems by external tectonic forcing." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/45964.
Повний текст джерелаChevalier, Francis. "Vitesse et cyclicité de fonctionnement des failles normales de rift : implication sur le remplissage stratigraphique des bassins et sur les modalités d'extension d'une marge passive fossile : aplication au demi-graben liasique de Bourg-d'Oisans (Alpes occidentales, France)." Phd thesis, Université de Bourgogne, 2002. http://tel.archives-ouvertes.fr/tel-00877244.
Повний текст джерелаJolley, Stephen J. "Mid crustal thrust tectonic processes : examples from the Dalradian of N.W. Donegal." Thesis, Durham University, 1994. http://etheses.dur.ac.uk/5884/.
Повний текст джерелаDiop, Catherine Bineta. "Structures et circulations de fluides dans un avant-pays synschisteux : le système de chevauchements des Mauritanides du Sénégal." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL044N.
Повний текст джерела