Dissertations / Theses on the topic 'Intracontinental'
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Benkhelil, Jean. "Structure et évolution géodynamique du bassin intracontinental de la Bénoué (Nigeria)." Nice, 1986. http://www.theses.fr/1986NICE4055.
Full textBenkhelil, Jean. "Structure et évolution géodynamique du Bassin intracontinental de la Benque, Nigéria." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37595918t.
Full textXie, Xiangyang. "Sedimentary record of Mesozoic intracontinental deformation in the south Ordos Basin, China." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1483471401&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.
Full textSilva, Marcelo Ferreira da. "Aerogeofísica, litogeoquímica e geologia na caracterização do rifte intracontinental da faixa Paraguai." reponame:Repositório Institucional da UnB, 2007. http://repositorio.unb.br/handle/10482/2839.
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A integração de dados aerogeofísicos e de litogeoquímica permitem propor um modelo de evolução geotectônica considerando a abertura de um rifte intracontinental na Faixa Paraguai. A presença de rochas vulcânicas básicas e piroclásticas ácidas concentradas na região dos Araés, município de Nova Xavantina, sudeste do estado do Mato Grosso, sugerem o envolvimento de múltiplas fontes mantélicas na geração do magmatismo bimodal na área. A presença de uma pluma mantélica na base da crosta continental é requerida para explicar a assinatura geoquímica dos basaltos encontrados na região (continental flood basalts e tipo OIB), bem como, a tentativa de abertura e formação de crosta oceânica durante a evolução do rifte é sugerida pela presença de basaltos toleíticos com assinatura de MORB. O processamento dos dados dos temas aeromagnéticos de campo anômalo, amplitude do gradiente horizontal total, amplitude do sinal analítico e inclinação do sinal analítico auxiliaram na caracterização das feições estruturais da região e o delineamento dos corpos magnéticos, delimitando os limites do rifte, orientado na direção EW, e que posteriormente foram reativados formando extensas zonas de cisalhamento com indicadores cinemáticos dextrais. A identificação de uma estrutura anelar delimitando as rochas vulcânicas na região do Garimpo dos Araés sugere a presença de uma caldeira ignimbrítica formada no início da abertura do rifte e tem implicações metalogenéticas para a prospecção na região.
Xue, Zhenhua. "Mesozoic tectonic evolution of the Longmenshan thrust belt, East Tibet." Thesis, Orléans, 2017. http://www.theses.fr/2017ORLE2020/document.
Full textThe Longmenshan Thrust Belt (LMTB), constituting the eastern boundary of the Tibetan Plateau, is well known by its steep topography, intensive tectonic activities and the complicated structures. As a typical composite orogen, the LMTB experienced extensive intracontinental deformation during the Mesozoic. The knowledge on the Mesozoic tectonic evolution of the LMTB therefore is crucial to understand the intracontinental orogeny and uplifting of the Plateau. The vertical cleavage belt divides the LMTB into a Western Zone and an Eastern Zone. The Eastern Zone displays a top-to-the-SE shearing while the western zone a top-to-the-NW shearing. The Eastern Zone can be further divided into four subunits with foliations deepening from SE to NW. The syntectonic granite and published geochronologic data constrain this main deformation to the Early Mesozoic around 219 Ma. Structural analysis, AMS and microstructural study and gravity modeling on the Pengguan complex, one of the orogen-parallel Neoproterozoic complexes located in the middle segment of the LMTB, reveal a basement-slice imbricated structure of the LMTB and adjacent areas. Published ages, localized fast exhumation rate and flexural subsidence of the foreland basin suggest that the basement-slices imbricated southeastwards during Late Mesozoic (166-120 Ma). The LMTB is far away from the contemporaneous plate boundary and devoid of ophiolite-related material, therefore, it is supposed to be an intracontinental orogen. During the Early Mesozoic, the Yangtze basement underthrusted westwards due to the far-field effect of the Paleo-Tethys’ obliteration, and the materials in different structural levels have been exhumated to the surface by southeastward thrusting and contemporaneous backward thrusting. During the Late Mesozoic, the basement is further underthrusted due to the collision between the Lhasa and Eurasia blocks, which led to SE-ward imbrication of the basementslices that may thicken the crust
Yu, Zhou. "Flexural strength of lithospere in central Asia and development of intracontinental orogens : the Tien Shan." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10718.
Full textBaqués, Almirall Vinyet. "Diagenesis and fluid-fracture evolution in an intracontinental basin: The Penedès half-graben,western Mediterranean / Diagènesi i evolució de la relació fluid-fractura en una conca intracontinental: la conca del Penedès, oest de la Mediterrània." Doctoral thesis, Universitat de Barcelona, 2012. http://hdl.handle.net/10803/112701.
Full textLa formació de la conca del Penedès està associada a un període extensiu d’edat neògena que provocà l’obertura del Solc de València. El marge nord-oest del Solc de València està constituït per una sèrie de grabens (Penedès, Vallès, Barcelona ...) i horsts (Garraf, Gaià-Montmell, Montnegre ...), el conjunt dels quals formen la Serralada Costanera Catalana. Aquesta serralada resulta de la superposició de tres esdeveniments tectònics principals: (1) l’extensió Mesozoica, compresa entre el Pèrmic i el Cretàcic inferior, (2) la compressió Paleògena, la qual produí la inversió de les principals conques extensives Mesozoiques i (3) l’extensió neògena, compresa entre l’Oligocè tardà i el Miocè mig, la qual generà l’actual sistema de rift de la Mediterrània occidental. S’han estudiat 19 afloraments localitzats tant en els alts estructurals, Garraf i Gaià-Montmell, com en el sector central de la conca del Penedès. A partir de les dades macro I microestructurals, juntament amb els resultats geoquímics de les roques encaixants, roques de falla i els ciments que reomplen les fractures, s’han identificat els següents estadis diagenètics: i. un primer estadi diagenètic temprà caracteritzat per la formació de microfractures de morfologies irregulars, formades en un sediment poc litificat i per la precipitació d’un ciment de calcita poc interaccionat amb la roca de caixa. ii. un segon estadi d’enterrament caracteritzat per la bretxificació i dolomitització de la roca encaixant i la generació d’estilòlits sub-paral•lels a l’estratificació. iii. nou etapes de deformació amb diferents tipus de rebliments associats a les fractures. iv. quatre estadis de carstificació caracteritzats per diferents tipus de bretxes de col•lapse, sediments i ciments que reomplen les porositats tipus fractura i vug, generades a partir de la dissolució. Els fluids relacionats amb l’extensió Mesozoica són característics d’aigües de formació, en canvi, els fluids que circularen al llarg de les fractures compressives paleògenes, són coherents amb fluids d’origen meteòric altament interaccionats amb la roca de caixa. L’extensió Neògena es caracteritza per una circulació predominant de fluids meteòrics no interaccionats amb la roca de caixa. És en l’estadi de post-rift on s’ha definit una dolomitització parcial de l’encaixant produïda per la barreja d’aigües marines i meteòriques. Durant l’estadi de post-rift tardà tingué lloc un esdeveniment de dissolució càrstica molt extens, el qual es relaciona amb la baixada del nivell del mar durant el Messinià.
Chu, Yang. "Tectonique intracontinentale dans le bloc de Chine du sud : exemple de la chaîne du Xuefengshan." Phd thesis, Université d'Orléans, 2011. http://tel.archives-ouvertes.fr/tel-00626808.
Full textSiqueira, Luzia Helena. "Granito São Domingos : registro de magmatismo pós-tectônico do orógeno intracontinental aguapeí - SW do Cráton Amazônico." Universidade Federal de Mato Grosso, 2015. http://ri.ufmt.br/handle/1/114.
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O Granito São Domingos corresponde a um dos corpos da Suíte Intrusiva Guapé, localizado na Faixa Móvel Aguapeí, relacionado à Orogenia Sunsás, SW do Cráton Amazônico. Trata-se de um corpo com dimensões batolíticas de 150 Km² de área aflorante, levemente alongado segundo direção NE e localizado ao norte do distrito São Domingos, município de Jaurú, estado de Mato Grosso. Constitui-se de rochas holo a leucocráticas, de cor rosa-claro a cinza-rosado, isotrópicas, equi a inequigranulares, por vezes, porfiríticas e pegmatíticas, classificadas como Muscovita biotita monzo a sienogranitos tendo por vezes, granada e monazita como minerais acessórios primários e caracterizadas como granitos do tipo S ou Muscovite bearing Peraluminous Granitoids (MPG). Essas rochas apresentam restritos e elevados teores de sílica, caracterizando-as como muito evoluídas; formadas por magmatismo cálcio alcalino de alto K a shoshonítico, peraluminoso e ferroso. A idade U-Pb (SHRIMP) de 928 ± 5 Ma foi obtida em zircões ígneos, e coincide com idades U-Pb (TIMS) relatadas para este granito. A análise Sm-Nd indica uma idade modelo TDM de 1,58 Ga, e valor ɛND(0,93Ga) negativo (-2,90). Esses resultados indicam que o Granito São Domingos formou-se em um ambiente pós-tectônico, no final da Orogenia Sunsás, cuja origem magmática está associada ao retrabalhamento de crosta continental mesoproterozoica. Três padrões diferentes de ETR foram encontrados para esses litotipos, sugerindo a geração de magmas contemporâneos não cogenéticos, provenientes de fontes crustais distintas.
The São Domingos Granite is an intrusive body of the Guapé Intrusive Suite, located in the Aguapeí mobile belt, corresponding to a branch of the Sunsás Orogeny in SW Amazonian Craton. This body is considered as a batholith slightly elongated in the NE direction, which crops out over an area of ca. 150 km2. It is situated to the north of the São Domingos District, a municipality of the Jauru city, Mato Grosso State. It consists of hololeucocratic to leucocratic rocks ranging from pinky to pinky-gray. They are isotropic, ranging from equigranular to inequigranular grains, sometimes porphyritic and pegmatitic, classified as muscovite-biotite monzo to syenogranites. Sometimes they present garnet and monazite as primary accessory minerals. These features characterize them as S-type granites or Muscovite bearing Peraluminous Granitoides (MPG). The rocks contain high silica content, which characterizes them as very evolved, formed by high-K to shoshonitic, peraluminous, and ferrous calc-alkaline magmatism. A U-Pb age of 928 ± 5 Ma was obtained for one of the analyzed rocks, which agrees with previous U-Pb ages obtained for this granite. Sm-Nd analysis indicates a TDM model age of 1.58 Ga, and negative ND value (-2.90). These results demonstrate that the São Domingos intrusion corresponds to a post tectonic environment, related to the Sunsás orogeny, whose magmatic origin is associated to re-working of the ancient continental crust. Moreover, three different ETR patterns were found for these lithotipes, suggesting the generation of contemporaneous non-cogenetic magmas, involving distinct crustal sources.
Santos, Michelli Santana. "Enriquecimento em magnetita e hematita em zonas de cisalhamento de cinturões orogênicos intracontinentais: o exemplo do setor norte do Orógeno Araçuaí-Oeste Congo, Brasil." Instituto de Geociências, 2017. http://repositorio.ufba.br/ri/handle/ri/26566.
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A Sequência Metavulcanossedimentar Igaporã-Licínio de Almeida está inserida na borda leste do Cinturão de Dobramentos e Cavalgamentos do Espinhaço Setentrional, um dos componentes do Corredor do Paramirim, na porção intracontinental do Orógeno Araçuaí. O objetivo principal desse trabalho é entender os processos metalogenéticos que levaram à magnetitização e à hematitização em protominérios estéreis situados em cinturões de dobramentos e cavalgamentos de orógenos intracontinentais. Na área de estudo ocorrem xistos máficos, itabiritos quartzosos, anfibolíticos e carbonáticos e rochas carbonatossilicáticas. Os domínios magnetitizados e hematitizados ricos ocorrem, principalmente, nos itabiritos. A geometria geral do depósito está relacionada com a presença de duplexes compressionais com topo estrutural para SW. Essas são estruturas relacionadas com a Zona de Cisalhamento Carrapato e, como elementos de maior escala contém uma foliação Sn, que é representada por um bandamento composicional e por uma xistosidade paralelizada a ele. A foliação Sn foi observada em todas as escalas e nos itabiritos transpõe uma foliação Sn-1 presente em dobras isoclinais intrafoliais. Estruturas S/C/C’, boudins, pinch –and swell, bem como dobras em bainha e dobras em cortina são coetâneas à formação dessa foliação metamórfica de transposição. Uma lineação de estiramento mineral (Lxn) da mesma fase deformacional integra o arcabouço estrutural, bem como uma incipiente foliação que trunca a Sn- 1//Sn e que se relaciona com as dobras em cortina. A alteração hidrotermal é coetânea com o desenvolvimento das zonas de cisalhamento, tendo sido identificados estágios de potassificação (biotitização e moscovitização), alteração à clorita, carbonatação, alteração a carbonato e formação de óxidos de ferro (magnetita e hematita). A magnetita hipogênica aloja-se em estruturas C’ e em charneiras de dobras isoclinais intrafoliais. Essa geração cresce incluindo silicatos e carbonatos esqueletiformes ou formando bordas de corrosão em: (i) ferri-tschermakita e oligoclásio em xistos máficos; (ii) carbonato, actinolita, quartzo, biotita em rochas carbonatossilicáticas; (iii) quartzo em itabiritos quartzosos; (iv) cumingtonita e quartzo em itabirito anfibolítico; e (v) quartzo, carbonato e moscovita em itabiritos carbonáticos. Além disso, esses óxidos de ferro também substituem moscovita, carbonatos, epidoto e porfiroblastos de anfibólios que truncam a Sn. A hematita é platiforme e ocorre em agregados policristalinos marcando a foliação Sn-1//Sn, bem como a foliação plano axial (Sn) em dobras isoclinais intrafoliais. A sua formação sugere condições de maior oxidação do sistema hidrotermal. Determinações por LA-ICPMS mostram que, de forma geral, nos itabiritos quartzosos e anfibolíticos as magnetitas hipogênicas são mais ricas em Elementos Terras Raras Leves do que as magnetitas precoces e sua composição se aproxima da composição da rocha encaixante da mineralização. A formação de domínios com enriquecimento em hematita e magnetita está relacionada com a percolação de fluidos hidrotermais que dissolveram silicatos, remobilizaram uma primeira geração de magnetita em itabiritos e precipitaram uma segunda geração desse mineral aproveitando estruturas de cisalhamento ediacaranas.
ABSTRACT - The Igaporã-Licínio de Almeida Metavolcano-sedimentary Sequence is located at the eastern border of the Northern Espinhaço Thrust and Fold Belt, one of the components of the Paramirim Corridor, in the intracontinental portion of the Araçuaí Orogen. The main objective of the present study was to understand the metallogenetic processes that lead to the magnetization and hematitization in sterile proto-ores located in thrust and fold belts of intracontinental orogens. Mafic schists, itabirites of quartz, amphibolite and carbonate composition, and carbonate-silicate rocks occur in the study area. Rich magnetized and hematitized domains occur mainly in itabirites. The general geometry of the deposit is related to the presence of compressional duplexes that present their structural top towards SW. These structures are related to the Carrapato Shear Zone and contain as large scale elements Sn foliation, which is represented by compositional banding and parallel schistosity. Sn foliation was observed at all scales and in the itabirites it transposed Sn-1 foliation present in intrafolial isoclinal folds. S/C/C’, boudins, pinch-and-swell structures, as well as sheath and curtain folds are coetaneous with the formation of this metamorphic transposition foliation. Mineral stretching lineation (Lxn) from the same deformational phase integrates the structural framework, as well as an incipient foliation that truncates Sn-1//Sn and is related to curtain folds. Hydrothermal alteration is coetaneous with the development of shear zones, where stages of potassification (biotitization and muscovitization), alteration into chlorite, carbonation, alteration into carbonate, and formation of iron oxides (magnetite and hematite) were identified. Hypogenic magnetite lodges itself in C’ structures and in fold axes of intrafolial isoclinal folds. This generation grows either including silicates and skeletal carbonates or forming corrosion edges in: (i) ferrotschermakite and oligoclase in mafic schists; (ii) carbonate, actinolite, quartz, biotite in carbonate-silicate rocks; (iii) quartz in quartz-rich itabirites; (iv) cummingtonite and quartz in amphibolitic itabirites; and (v) quartz, carbonate, and muscovite in carbonate itabirites. In addition, this iron oxide also replaced muscovite, carbonates, epidote, and are found in porphyroblasts of amphiboles that truncate the Sn foliation. Hematite is platy-shaped and occurs in polycrystalline aggregates, characterizing the Sn-1//Sn foliation, as well as the axial plane foliation (Sn) in intrafolial isoclinal folds. Its formation suggests higher oxidation conditions of the hydrothermal system. The LA-ICPMS technique showed that, in general, in quartz-rich and amphibolitic itabirites, hypogenic magnetites are richer in Light Rare Earth Elements than early magnetites, and their composition is close to that of the country rock of the mineralization process. The formation of hematite- and magnetite-enriched domains is related to the percolation of hydrothermal fluids that dissolved silicates, remobilized the first generation of magnetites in itabirites, and precipitated a second generation of this mineral taking advantage of Ediacaran shear structures.
Poitrasson, Franck. "Apports du système radiométrique Samarium-Néodyme à la connaissance du magnétisme anorogénique intracontinental. Exemple du sud-est de la France (Corse et Estérel)." Clermont-Ferrand 2, 1994. http://www.theses.fr/1994CLF21601.
Full textRobert, Alexandra. "Déformation polyphasée et importance de l'héritage structural dans les longmen shan (sichuan, chine) : apports d'une approche couplée entre géophysique et géologie." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00647321.
Full textMeresse, Florian. "Dynamique d’un prisme orogénique intracontinental : évolution thermochronologique (traces de fission sur apatite) et tectonique de la Zone Axiale et des piémonts des Pyrénées centro-occidentales." Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20038.
Full textIn this work on a complete transect of the west-central Pyrenees, we combine low temperature thermochronology (apatite fission tracks, AFT) with a detailed structural analysis to describe vertical movements related to the thrusting system evolution, and to determine the influence of the latter on the sedimentation/burial/exhumation cycle of the synorogenic deposits of the southern foreland basin (Jaca and Ainsa basins). AFT analysis from a transect of the south-Pyrenean basin show the southward decrease of the fission track reset level from the southern edge of the Axial Zone to the South-Pyrenean frontal thrust, implying the southwards decrease of the burial amount from more than 5km in the north to less than 3km in the south assuming an average geothermal gradient of 25°C.km-1. The structural setting of the Jaca basin attests that the burial of the synorogenic sediments was mainly due to the sedimentary accumulation. AFT data from the northern part of the basin display a late Oligocene-early (middle) Miocene cooling event. New interpretation of industrial seismic reflection profiles across the Jaca basin suggests that the Oturia thrust is rooted in the Bielsa basement thrust, responsible for the early (-middle) Miocene out-of-sequence tectonic reactivation of the southern flank of the Axial Zone (Jolivet et al., 2007). These results reveal a lower Miocene (Burdigalian -?Langhian) out-of-sequence episode of tectonic activity of the interior of the south-Pyrenean foreland basin. AFT data from the Axial Zone and the North-Pyrenean Zone confirm the general southward migration of the thrusting system, and also bring evidence of the late Oligocene-lower Miocene out-of-sequence tectonic reactivation of the northern flank of the Axial Zone. All these results attest of a late Oligocene-lower Miocene (Burdigalian-?Langhian) 'pop-up' reactivation of the inner part of the west-central Pyrenees, younger than the sealing of the south-Pyrenean front (Aquitanian-?Burdigalian) which is classically considered to mark the end of the Pyrenean compression. These results lead us to propose a new crustal scale evolution model of the west-central Pyrenees in 3 stages: (i) From the Late Cretaceous to the middle Eocene, the orogenic prism is characterised by the absence of relief, related to the inversion of Cretaceous extensional structures leading to the accretion of thin crustal units; (ii) The late Eocene-Oligocene stage corresponds to the continental collision, marke d by the creation of important relief associated with the accretion of thick crustal units; (iii) During the early Miocene, the inner part of the Pyrenean wedge is tectonically reactivated
Hallas, Peter [Verfasser], Uwe [Akademischer Betreuer] Kroner, Uwe [Gutachter] Kroner, Helmut [Gutachter] Schaeben, Jörg [Gutachter] Pfänder, and Nikolaus [Gutachter] Froitzheim. "Tectonics of an intracontinental exhumation channel in the Erzgebirge, Central Europe / Peter Hallas ; Gutachter: Uwe Kroner, Helmut Schaeben, Jörg Pfänder, Nikolaus Froitzheim ; Betreuer: Uwe Kroner." Freiberg : Technische Universität Bergakademie Freiberg, 2020. http://d-nb.info/1220779644/34.
Full textBuffard, Roland. "Un rift intracontinental du précambrien supérieur : le Shaba méridional (Zaïre) : évolution sédimentaire et tectonique du Supergroupe de Roan au Groupe du Kundelungu inférieur (Supergroupe du Kundelungu)." Le Mans, 1988. http://cyberdoc.univ-lemans.fr/theses/1988/1988LEMA1005.pdf.
Full textThe Upper Proterozoïc Shaba of Zaire constitues a great sedimentary and volcanic sedimentary complex suddivides in two parts : a southeastern folded arc (Shaba arc) and northeastern subtabularies beds. The detailed analysis of these faulted formations from Roan to lower Kundelungu age has shown they belonged to intracontinental rift in extension. It gives some structural units : tilted blocks and horsts with reef and tidalite facies, subsiding area (Fungurume) and coastal basins and lagoons (Musonoi, Kipushi) with confined sediments, turbidite sandstone facies (Upper Mwashya), tillitic deposits (Great Conglomerate), or evaporitic sequence sebkha facies. The latter has played an important role in the post brecciation of the sedimentary cover. The lithological and geographical distribution of the very important Cu-Co (Roan) and Cu-Zn (Lower Kundelungu) ore deposits and their qualitative and quantitative variations have been explained thanks to this model
Buffard, Roland. "Un Rift intracontinental du Précambrien supérieur, le Shaba méridional, Zaïre évolution sédimentaire et tectonique du supergroupe de Roan au groupe du Kundelungu inférieur, supergroupe du Kundelungu /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37612267w.
Full textBaker, Yvette. "Development of a three-dimensional shallow marine suspended sediment distribution model (SUSD3D) with application to the coarse-grained deltas of the intracontinental strike-slip Bohemian Cretaceous basin." Thesis, Royal Holloway, University of London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397400.
Full textWalter, Bastien. "Réservoirs de socle en contexte extensif : genèse, géométries et circulations de fluides : exemples du rift intracontinental du lac Albert (Ouganda) et de la marge proximale d'Ifni (Maroc)." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0201/document.
Full textThis work aims to characterize with a multi-scale and multi-method approach the effects of both brittle deformation and weathering processes on the structural and petrophysical properties of two surface analogue case studies developed in extensive setting. This approach allows us to build a conceptual hydrocarbon basement reservoir model for both studied systems. These geological models enhance the understanding of those non-conventional petroleum systems from the maturation zone to storage in the basement. Moreover, this study can also provide information for exploration guides for those hydrocarbon reservoirs. This study points out the multi-scale distribution of all the features constituting the reservoir, over ten orders of magnitude from the pluri-kilometric scale of the major tectonics structures to the infra-millimetric scale of the secondary micro-porosity of fractured and weathered basements units. Major fault zones allow the “compartmentalization” of the reservoir by dividing it into several structural blocks. The analysis of these fault zones highlights the necessity for the basement reservoirs to be characterized by a highly connected fault and fracture system, where structure intersections represent the main fluid drainage areas between and within the reservoir’s structural blocks. The suitable fluid storage areas in these reservoirs correspond to the damage zone of the fault structures developed during the tectonic evolution of the basement and the weathered units of the basement roof developed during pre-rift exhumation phases. This study highlights therefore that basement reservoir properties are the result of the long geodynamic evolution of these rocks
Chalot-Prat, Françoise. "Petrogenese d'un volcanisme intracontinental tardi-orogenique hercynien : etude d'un complexe volcanique carbonifere du tazekka et de zones volcaniques comparables dans le mekam et la region de jerada (maroc oriental)." Paris 6, 1990. http://www.theses.fr/1990PA066442.
Full textMoretti, Isabelle. "Modélisation de l'extension intracontinentale : exemple du Golfe de Suez." Paris 11, 1987. http://www.theses.fr/1987PA112056.
Full textMoretti, Isabelle. "Modélisation de l'extension intracontinentale exemple du Golfe de Suez /." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37608245t.
Full textRizza, Magali. "Analyses des vitesses et des déplacements co-sismiques sur des failles décrochantes en Mongolie et en Iran - Approche morphotectonique et paléosismologique." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2010. http://tel.archives-ouvertes.fr/tel-00591794.
Full textGaudemer, Yves. "Mécanismes de la déformation intracontinentale dans l'ouest des Etats-Unis." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375978150.
Full textSkrzypek, Etienne. "Contribution structurale, pétrologique et géochronologique à la tectonique intracontinentale de la chaîne hercynienne d'Europe (Sudètes, Vosges)." Phd thesis, Université de Strasbourg, 2011. http://tel.archives-ouvertes.fr/tel-00773597.
Full textMICHEL-NOEL, GERARD. "Mecanismes et evolution de l'extension intracontinentale des "basin and range", et developpement tectonique des bassins sedimentaires." Paris 6, 1988. http://www.theses.fr/1988PA066419.
Full textLesne, Olivia. "Dynamique de l'extension intracontinentale dans le rift baikal (siberie) - apport de mesures gps et modeles numeriques -." Paris 6, 1999. http://www.theses.fr/1999PA066576.
Full textHaugmard, Méric. "Détermination non-linéaire des paramètres hypocentraux et structuraux : application à la sismicité intracontinentale du Massif armoricaine." Thesis, Nantes, 2016. http://www.theses.fr/2016NANT4026/document.
Full textThe most widely used inversion schemes to determine local or regional earthquake sources (epicenter, depth and origin time), are based on iterative linearized leastsquares algorithms and strongly depend on an a priori knowledge. We introduce a joint structure-source determination approach for one or several events. This procedure manages to get away from dependence on an initial solution and minimizes the influence of poorly known seismic velocity structure used for calculating the propagation time. The exploration relies on parallel Markov chain Monte Carlo techniques, which sample models within a broad range of parameters, distributed according to the posterior distributions. The arrival time uncertainties of direct and refracted waves on the Mohorovičić discontinuity, defined by hand-picking, are fully exploited by Bayesian inference and lead the nonlinear determination. The analysis of covariances between parameters and the projections of the structure parameter variations on the source parameter space provide information about the influence of the seismic network geometry (sparse and/or azimuthally inhomogeneous), or an inappropriate velocity structure. This procedure is applied to the moderate and diffuse local seismicity of the Armorican Massif (western France), an extensive outcrop of the Variscan basement, which crustal structure is apprehended with large uncertainties. The accurate location of 350 earthquakes, with a set of more than 7,000 onset time of seismic-waves recorded by permanent and temporary networks between 2011 and 2013, sheds new light on the seismicity and the structure of the Armorican Massif
Delcaillau, Bernard. "Evolution geomorphostructurale d'un piemont frontal de chaine de collision intracontinentale : les siwalik de l'himalaya du nepal oriental." Toulouse 2, 1986. http://www.theses.fr/1986TOU20091.
Full textSouth of the himalayas, the siwalik range, developped in the mio-pleistocene molassic deposits, is composed of ese-wnw trending hogbacks. The geomorphological structural and sedimentological datas show that the orogenic movements are under the strict dependance of the thrusting dynamic : the reliefs are linked to thrusts which appeared successively from north to south : the m. B. T. Appeared first, then the m. D. T. And finally, the m. S. T. . This successive appearence of thrusts and reliefs more and more recent from north to south, can be assimilated to a piggy back thrust sequence. The siwalik area is closely comparable to a tectonic accretionary wedge linked to an intracontinental collision. In this survey, we'll successively analysed the siwalik and post-siwalik sedimentation and the deformation of these materials inside each thrusting set. The stress pattern is analysed and compared with the morphostructural organisation of the siwalik. In conclusion, a geodynamic evolutionary model of this intracontinental tectonic prism has been proposed in this analysis
Delcaillau, Bernard. "Evolution géomorphostructurale d'un piémont frontal de chaîne de collision intracontinentale les Siwalik de l'Himalaya du Népal oriental." Lille 3 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37597020c.
Full textCharrière, André. "Héritage hercynien et évolution géodynamique alpine d'une chaine intracontinentale : le Moyen-Atlas au sud-est de Fes (Maroc)." Toulouse 3, 1990. http://www.theses.fr/1990TOU30053.
Full textPinton, Aurélie. "Anatomie, systématique et phylogénie de poissons Synodontis actuels et fossiles (Siluriformes, Mochokidae) : implications dans la paléobiogéographie intracontinentale néogène d' Afrique." Poitiers, 2008. http://theses.edel.univ-poitiers.fr/theses/2008/Pinton-Aurelie/2008-Pinton-Aurelie-These.pdf.
Full textThe Rift Valley has long been considered as an ecological barrier until recent discoveries of Mio-Pliocene fossiliferous outcrops in Central Africa: our paleobiogeographical conceptions have to be reappraised. In this context, identification of effective biogeographical barriers preventing dispersals during the Mio-Pliocene may provide a first order constraint in which evolution in Africa could be drawn. The hydrographical network constitutes one of the major constraints to dispersal. Our work aims at reconstructing the hydrographical network during the Neogene. The widespread african catfish genus Synodontis (Mochokidae, Siluriformes) is used as a proxy: its abundance in the fossil record together with an important modern diversity implies a complex history for the African freshwater. So far, the Synodontis species are recognized on soft characters. Here, I propose a study of the bony anatomy of extant Synodontis species from the Nilo-Soudan province and propose specific osteological characters. Those characters are used in the fossil to recognize specimens at a specific level throughout Mio-Pliocene sites of Africa (Chad, Egypt, Tunisia, and Uganda). A molecular phylogeography of Synodontis species is established. To reconstruct history of the group, we combined molecular and osteological analyses. The evolution of the group is structured around the Central African Shear Zone and influenced by the formation of the Rift. The Synodontis origin is Congolese and roots in the Oligocene (~30 Myr). Rapidly, they disperse in the Nilo-Sudan and Lower Guinean provinces. Our results support an ancient drainage system independent from the Nil, extending from West to East Africa and operating during the Middle Miocene. In the Late Miocene, distribution of the Synodontis species appears much more heterogeneous than the modern one. The intensive Plio-Pleistocene exchanges in the Nilo-Sudan province have greatly contributed to homogenize the ichtyofauna and to give the modern pattern of distribution
Godard, Vincent. "Couplage érosion-tectonique en contexte de convergence intracontinentale : étude comparée de la chaîne himalayenne et des Longmen Shan (est-Tibet)." Paris 11, 2006. http://www.theses.fr/2006PA112292.
Full textMargins of large continental plateaus often present significant topographic escarpments, localizing active tectonics and denudation processes. For that reason they constitute a favorable setting for the study of the links between internal and external processes. The main objective of this thesis is to conduct a comparative study of the southern and eastern borders of the Tibetan Plateau: the Himalayas and the Longmen Shan. Both areas present comparable topographic gradients, with contrasting tectonic regimes. The Himalayas are a place of active shortening, associated with the India-eurasia convergence, whereas no significant present tectonic activity can be detected across the Longmen Shan. The quantification of denudation at different timescales in the Longmen Shan allows to balance the classical model proposed for the evolution of this area. In this model the topographic front is actively sustained by lower crustal material flow from the Plateau, toward the foreland. Our data suggests that the evolution of this part of the Plateau is rather controlled by the propagation of a regressive erosion wave toward the Plateau interior on a passive escarpment inherited from earlier deformation stages. The focalisation of erosion at the edge of the Plateau induces a global flow in the crust, toward the foreland. The Himalayas present a significantly contrasting dynamics where the link between tectonic and erosion is inverted with respect to the Longmen Shan case. In opposition to a widely proposed evolution mechanism, our modelling of the dynamics of this area indicates that the localization of erosion is dictated by the structural context, rather than by the repartition of precipitation. The two investigated mountain ranges present contrasting dynamics, where the respective influences of erosion and tectonics are different
David, Claire. "COMPORTEMENT ACTUEL DE L'AVANT-ARC ET DE L'ARC DU COUDE DE ARICA DANS L'OROGÉNÈSE DES ANDES CENTRALES." Phd thesis, Université Paul Sabatier - Toulouse III, 2007. http://tel.archives-ouvertes.fr/tel-00216117.
Full textLe long de l'orocline des Andes Centrales, sous la Précordillère et l'arc volcanique, la sismicité intracontinentale se distribue en essaims superficiels dont les plus grands séismes (Mw>5.0) ont lieu en général quelques mois après de grands séismes de subduction de magnitude Mw>7.5, déclenchés par le changement de contraintes dû à la période cosismique et probablement post-sismique.
L'analyse d'images et les observations de terrains interprétées conjointement avec les données sismologiques montrent que la déformation de l'orocline est partitionnée dans la Précordillère et l'arc volcanique le long d'une grande zone de cisaillement parallèle à la marge dont la cinématique varie de sénestre au Sud Pérou à dextre au Nord Chili. Le partitionnement observé est attribué à l'obliquité de la convergence et à l'architecture de l'avant-arc et de l'arc volcanique alors que les variations de la déformation le long de l'orocline sont principalement attribuées à la forme de la marge.
L'analyse sismologique, morphologique, et structurale de la déformation indique que le tenseur de contraintes le long de l'arc volcanique est caractérisé par un σ2 vertical et que σ1 et σ3 montrent une rotation anti-horaire depuis le Sud du Coude vers le Nord. En effet, σ1 s'oriente NE-SW au Nord du Chili, NW-SE à l'extrême Sud du Pérou et E-W au sud Pérou.
Guillot, Stéphane. "Le granite du Manaslu (Népal central), marqueur de la subduction et de l'extension intracontinentales himalayennes : étude structurale, métamorphique et géochimique." Phd thesis, Grenoble 1, 1993. http://tel.archives-ouvertes.fr/tel-00723696.
Full textPopoff, Michel. "Déformation intracontinentale Gondwanienne : rifting mézoique en Afrique : évolution meso-cénozoique du fossé de la Bénoué, Nigéria : relations avec l'ouverture de l'Océan Atlantique Sud." Aix-Marseille 3, 1990. http://www.theses.fr/1990AIX3A002.
Full textDucasse, Laurent, and Pierre-Christophe Velasque. "Géotraverse dans la partie occidentale des Pyrénées, de l'avant-pays aquitain au bassin de l'Ebre : effet d'une inversion structurale sur l'édification d'une chaîne intracontinentale." Aix-Marseille 3, 1988. http://www.theses.fr/1988AIX30025.
Full textDucasse, Laurent Velasque Pierre-Christophe. "Géotraverse dans la partie occidentale des Pyrénées de l'avant-pays aquitain au bassin de l'Ebre effet d'une inversion structurale sur l'édification d'une chaîne intracontinentale /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37613386p.
Full textIbrahim, Ahlam. "Caractéristiques pétrographiques et géochimiques et évolution diagénétique des bassins silicoclastiques mésoprotérozoïques intracontinentaux : implications sur la genèse des gisements d’uranium de type discordance." Thesis, Nancy 1, 2007. http://www.theses.fr/2007NAN10086.
Full textA mineralogical, petrographic and geochemical study of the proterozoic siliciclastic sedimentary intracontinental basins of Waterberg (Kaapvaal Craton, South Africa), Cariewerloo (Gawler Craton, South Australia), Satakunta and Muhos (Fennoscandian Shield, Finland), unconformably overlying archaean and paleoproterozoic basement, have been characterized and compared with other districts throughout the world similar in age and lithology (the basin of Athabasca in Canada, the basin of Kombolgie in Australia, and the basin of Pasha-Ladoga in Russia) which are associated with uranium ore deposits. The realized study made it possible to reconstitute the nature of the detrital phases and their evolution during diagenesis and hydrothermal events, in order to evaluate the interests that represent the sediments of these basins for the exploration of uranium by reference to strongly mineralized Athabasca and Kombolgie basins. This study shows that the clastic rocks of all of these basins are characterized by a high immaturity of sedimentary materials, a strong oxidation, as well as a diagenesis or a metamorphism of high temperature. These sediments, rich in potassic feldspar and plagioclase with frequently angular clasts, were transported over a short distance from the source area and subjected to a limited pedogenic alteration in a very active tectonic context, contrary to the sediments of the Athabasca and Kombolgie basins. However, significant fluid circulations took place as shown by the presence of an argillaceous alteration on the roof of the basement of the Cariewerloo, Satakunta and Muhos basins, as the argillaceous alteration. This alteration remains however moderate compared to that observed in the Athabasca and Kombolgie basins. These fluid circulations are related to zircon alterations, and essentially to the formation of Fe-chlorite and carbonate
Coussement, Christophe. "Structures transverses et extension intracontinentale : le rôle des zones de failles d'Assoua et Tanganyika-Rukwa-Malawi dans la cinématique néogène du système de Rift Est-africain." Brest, 1995. http://www.theses.fr/1995BRES2008.
Full textCorsini, Michel. "Influence de l'héritage tectono-sédimentaire dans une chaîne intracontinentale relation entre la marge du bassin cambrien de la Meseta occidentale du Maroc et la cinématique hercynienne /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376130307.
Full textMayol, Stéphane. "Géologie de la partie occidentale de la boutonnière paléozoi͏̈que des Jebilet, Maroc : un exemple d'évolution structurale hercynienne de bassins intracontinentaux cambrien et carbonifère." Aix-Marseille 3, 1987. http://www.theses.fr/1987AIX30063.
Full textMayol, Stéphane. "Géologie de la partie occidentale de la boutonnière paléozoïque des Jebilet, Maroc un exemple d'évolution structurale hercynienne de bassins intracontinentaux cambrien et carbonifère /." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37607885g.
Full textGaulier, Jean-Michel. "De l'extension intracontinentale a l'accretion oceanique : geodynamique de la mer rouge. resultats de la campagne minos, modelisation geophysique et cinematique. augmentee de quelques considerations tectoniques sur l'afar." Paris 6, 1990. http://www.theses.fr/1990PA066143.
Full textCorsini, Michel. "Relation entre la marge du bassin cambrien et la cinématique hercynienne de la Meseta occidentale du Maroc : un exemple de l'influence de l'héritage tectono-sédimentaire dans une chaîne intracontinentale." Phd thesis, Aix-Marseille 3, 1988. http://tel.archives-ouvertes.fr/tel-01015143.
Full textVernant, Philippe. "Cinématique actuelle et dynamique de l'Iran : GPS et modélisation numérique." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2003. http://tel.archives-ouvertes.fr/tel-00004979.
Full textLe premier réseau, à l'échelle de l'Iran, permet de préciser les conditions aux limites de cette zone et de quantifier les taux de convergence accommodés par les grandes structures iraniennes. Pour cela, on calcule les pôles et vitesses de rotation de la plaque arabe et du Bloc Central Iranien ainsi que la déformation de l'Alborz, du Kopet-Dag et du Zagros. Le second se concentre sur la région de l'Alborz central ; il est plus particulièrement dédié à l'étude de la déformation d'une chaîne de montagnes étroite. Les apports du champ de vitesse sur la tectonique actuelle, obtenu par les mesures de ces réseaux, sont détaillés en tenant compte des données géologiques et sismotectoniques.
Le champ de vitesse est ensuite analysé pour essayer de déterminer si la déformation est continue ou concentrée à la périphérie de blocs rigides. La modélisation mécanique est alors employée pour aider à la compréhension de la dynamique actuelle de la région ; deux modèles sont développés dans ce sens. Le premier en 2.5D simule la collision oblique du Zagros en tenant compte de la perturbation thermique imposée par la subduction du manteau arabe sous l'Iran. Il étudie l'influence d'une faille de partitionnement sur la bordure Nord de la chaîne. Le second est un modèle 3D de la lithosphère iranienne. Les conditions aux limites sont imposées par le mouvement de l'Arabie par rapport à l'Eurasie déterminé par le GPS. Les grands accidents décrochants sont simulés par des zones de contact. Le champ de vitesse modélisé est alors comparé aux observations GPS.
Hallas, Peter. "Tectonics of an intracontinental exhumation channel in the Erzgebirge, Central Europe." 2019. https://tubaf.qucosa.de/id/qucosa%3A71605.
Full textRaimondo, Thomas. "The architecture and evolution of intracontinental orogens: a structural, metamorphic and geochemical characterisation." Thesis, 2011. http://hdl.handle.net/2440/75700.
Full textThesis (Ph.D.) -- University of Adelaide, School of Earth and Environmental Sciences, 2011
MERESSE, Florian. "Dynamique d'un prisme orogénique intracontinental : évolution thermochronologique (traces de fission sur apatite) et tectonique de la Zone Axiale et des piémonts des Pyrénées centro‐occidentales." Phd thesis, 2010. http://tel.archives-ouvertes.fr/tel-00772154.
Full textBarbosa, João Bruno Valério Dias. "Formação de bacias sedimentares por relaxamento de dobramento elástico." Master's thesis, 2018. http://hdl.handle.net/10451/33918.
Full textOs orógenos Paleozóicos (e.g. Varisco e Caledónico) são caracterizados por dobramentos tardios de grande comprimento de onda e amplitude. E se este dobramento originalmente tivesse sido diferente, i.e., com menor comprimento de onda e amplitude, e só posteriormente tivesse adquirido a configuração actual? Neste estudo e por modelação experimental, é investigada a formação de bacias sedimentares intra-continentais, em dobramentos litosféricos de larga-escala, formadas num regime de relaxamento pós-orogénico. A resposta litosférica é modelada a partir da reologia viscoelástica de Maxwell, tendo como objectivo perceber a resposta da superfície frágil ao relaxamento da tensão elástica, imposta via matriz viscosa. O modelo é caracterizado por dois estádios: um primeiro de encurtamento paralelo à estratificação em cisalhamento puro, e um segundo de relaxamento do modelo com os limites fixos (velocidade do pistão = 0). Para o primeiro estádio, e devido à configuração do modelo, foi verificado que as bacias sedimentares formadas por dobramento activo apenas se desenvolvem se a fracção elástica da litosfera dobrar em profundidade. Apesar do modelo apresentar um leito elástico de comprimento finito (extremidades longe das paredes confinantes do modelo), a correlação entre os resultados experimentais e a solução analítica de Biot para o dobramento activo de um leito elástico numa matriz viscosa é bastante boa. Durante o estádio de relaxamento pós-dobramento, o leito elástico tende a voltar à forma original, relaxando desta forma a energia elástica acumulada durante o primeiro estádio do dobramento, e produzindo estiramento no leito frágil suprajacente. Consequentemente, as bacias sedimentares por relaxamento elástico imediatamente se formam como resposta à energia acumulada no leito elástico. Este relaxamento diminui o número de bacias sedimentares geradas por dobramento, devendo-se à rápida coalescência das charneiras dos antiformas de menor amplitude (formados pelo encurtamento), desenvolvendo progressivamente sinformas de maior amplitude no domínio interno e central do leito elástico. No domínio interno e nos primeiros minutos de relaxamento, o desdobramento é seguido pelo colapso gravítico das charneiras dos antiformas, aí formando grabens que se tornam mais pronunciados à medida que o leito elástico retorna à sua forma original. Contudo, é na parte central do leito elástico onde se verificam os dobramentos de maior amplitude e comprimento de onda que, após atingida a amplitude de pico do dobramento, se dá o colapso gravítico das charneiras dos antiformas. A partir deste momento, os sinformas tornam-se gradualmente mais fechados e de menor amplitude, enquanto as bacias tectonicamente condicionadas por grabens a topo dos antiformas, cada vez mais profundas e de maior amplitude, mostrando que é no domínio central que se desenvolvem as bacias sedimentares com maior expressão. Por fim, através deste processo de formação de bacias sedimentares extensionais pós-orogénicas, é proposto um provável processo para a formação das bacias do Varisco Ibérico, bem como a semelhança com as bacias sedimentares Caledónicas no Oeste da Noruega, como previsto por Marques & Mandal (2016).
Past orogens like Variscan and Caledonian are characterized by late, large-scale folds with great amplitude and wavelength. What if this folding had originally been different, for instance, with lower wavelength and amplitude and only later on had acquired its current configuration? In this study and by physical modeling, the formation of intracontinental sedimentary basins, on lithospheric large-scale folds, formed in a post-orogenic relaxation. The lithospheric answer is modulated from the Maxwell viscoelastic rheology, having as goal the understanding the behavior of the brittle surface response to the relaxation of elastic stress imposed by the viscous matrix. The model is characterized by two stages: the first, of layer-parallel shortening in pure shear, and the second in post-buckling relaxation with fixed limits (piston velocity = 0). For the first stage, and due to the configuration of the model, it was verified that the sedimentary basins formed by buckling only develop if the elastic fraction of the lithosphere buckle in depth. In spite of the model displaying an elastic layer of finite length (ends far from the bounding walls of the model), the correlation between the experimental results and the Biot analytic solution for the buckling of an elastic layer in a viscous matrix is quite good. During the post-buckling relaxation, the elastic layers tends to revert to its original form, in this spreading in the overlying. As consequence, the sedimentary basin by elastic relaxation immediately form as consequence of the accumulated energy in the elastic layer. This relaxation shortens the number of sedimentary basins generated by buckling, due to the rapid developing synforms with higher amplitude, due to the rapid coalescence of the lower amplitude hinges (formed due to the shortening), progressively developing higher amplitude synforms in the internal and in the center of the elastic layer. In the internal domain, and in the first minutes of the relaxation, the unfolding is followed by the gravitational collapse of the antiforms hinges, therefore forming grabens that become more emphasized the more the elastic layer returns to its original form. However, it’s in the central domain of the elastic layer that its verified the biggest and lengthiest amplitude wave folding that, after reaching the folding amplitude peak, the gravitational collapse of the antiforms hinges occurs. From this moment, the synforms become gradually tighter with lower amplitude, while the sedimentary basins that are tectonically constrained by grabens on top of the antiforms, of increasingly bigger amplitude and width, showing that it’s in the central domain where the sedimentary basins biggest emphasis are expressed. At last, during this forming process of extensional post-orogenic basins, its proposed a probable process to the formation of the Iberian Variscan basins, as well as a similarity with the Caledonian sedimentary basins in West of Norway, as foreseen by Marques & Mandal, 2016.