Orientador: Antonio Batocchio / Dissertação (mestrado profissional) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica / Made available in DSpace on 2018-08-05T20:01:02Z (GMT). No. of bitstreams: 1 Scatolin_AndreCelso_M.pdf: 1108284 bytes, checksum: 1834481388729e17c9e3a8744641a821 (MD5) Previous issue date: 2005 / Resumo: Este trabalho tem o objetivo de mostrar a eficiência da aplicação da metodologia Seis Sigma para a redução das perdas num processo de manufatura. O processo de fabricação de respiradores descartáveis foi escolhido para o estudo de caso porque gerava uma enorme quantidade de perda das fibras utilizadas como matéria-prima. As metodologias de melhorias até então aplicadas tinham reduzido significativamente o nível das perdas, porém se fazia necessária uma abordagem diferente para se reduzir ainda mais. Seguindo a metodologia Seis Sigma, uma equipe foi formada para focar a atenção na redução destas perdas e quebrar o paradigma que não se pode eliminar as perdas inerentes de um processo. Através da adição de uma fase de desfibramento da perda ¿ fibra prensada que era descartada ao final do processo ¿ recuperou-se toda esta fibra, deixando-a com características semelhantes à fibra virgem. Portanto, as perdas foram 100% eliminadas. O nível sigma, que era historicamente menor que 3, passou para maior que 6 ao final do trabalho. A aplicação de ferramentas estatísticas demonstrou qual o ponto otimizado da mistura de fibras virgens e fibras recuperadas, para que as propriedades finais do produto não sofressem alterações significativas sob o ponto de vista do usuário final. Este trabalho gerou um desenvolvimento técnico da equipe envolvida e preciosa economia de recurso não renovável / Abstract: This work aims to show the efficiency of Six Sigma Methodology application in reducing waste of a manufacturing process. The making process of disposable respirator was chosen to this case study because it generated an enormous amount of fiber scrap used as raw material. Improving methodologies applied every since had reduced significantly the waste level but a different approach was needed to reduce it even more. Following the Six Sigma Methodology, a team was formed to focus the whole attention on reducing this waste and breaking the paradigm which inherent waste of a process cannot be eliminated. Through an addition of a new process step in order to reprocess the waste ¿ pressed fiber discharged by the end of this process - all of it was recovered, keeping the same characteristics of raw fiber. Therefore, the waste was 100% eliminated. Sigma level, which was historically lower than 3, became higher than 6 by the end of the work. The statistics tools applied demonstrated the optimized set point of the raw and recovered fiber mixture in order to maintain the final product properties under the point of view of end-users. This work resulted in team technical development and precious non-renewed raw material savings / Mestrado / Planejamento e Gestão Estrategica da Manufatura / Mestre em Engenharia Mecânica

Indiana University-Purdue University Indianapolis (IUPUI) / Belt-drives are used in many applications such as industrial machines, washing ‎machines, and accessory drives for automobiles and other vehicles. Multibody dynamics/finite ‎element numerical models have become an effective way to predict the dynamic response of ‎belt-drives. In this thesis, a high fidelity numerical model was built using a multibody ‎dynamics/finite element code to simulate a belt-drive. The belt-drive transmits power from a ‎turbine of a Rankin cycle (that uses the exhaust waste heat of the internal combustion engine as ‎heat source) to the crank shaft of the engine. The code uses a time-accurate explicit numerical ‎integration technique to solve the multibody dynamics differential equations. The belt was ‎modeled using three-node beam elements to account for the belt axial and bending ‎stiffness/damping, while the pulleys, shafts and tensioner body were modeled as rigid bodies. ‎The penalty technique was used to model normal contact between the belt and the pulleys. An ‎asperity-based friction model was used to approximate Coulomb friction between the belt and ‎the pulleys. The dynamic response predicted using the model was validated by comparing it to ‎experimental results supplied by Cummins Inc. A parameter sensitivity study was performed to ‎evaluate the change in response due to change in various belt-drive parameters. A fatigue ‎model was developed to predict the belt fatigue life using output from the explicit finite ‎element code including normal and tangential forces between the belt and the pulleys and belt ‎tension. The belt fatigue life was evaluated for alternative belt-drive configurations in order to ‎find the configuration with the longest life.‎

China has gone through a phase of rapid economic development in the last four decades. The country is the world’s biggest economy, measured in GDP purchasing power parity terms, and the largest trading nation in terms of the total sum of exports and imports of merchandise trade. With the launch of the century’s largest infrastructure project – the Belt and Road Initiative (BRI) – by Xi Jinping in 2013, China is planning to revive the Ancient Silk Roads in order to gain geopolitical power beyond Asia. Thus far, huge flows of FDI have already made their way from China to countries along the Belt and Road, especially the ones in need of additional infrastructure provision. In this paper, the effect of Chinese outward FDI on economic growth in the BRI economies through infrastructure development is examined, thereby conducting a cross-country analysis with panel data for 34 and 27 countries, respectively, over the period 2005–2017. The direct effect of Chinese FDI on economic growth in BRI countries is ambiguous, supporting previous literature on FDI and economic growth. When adding infrastructure indicators to the regressions and accounting for the endogeneity problem, the effect of Chinese FDI on economic growth changes but remains insignificant, nevertheless. This is most likely due to the reduced sample sizes, on the one hand, and the fact that Chinese construction contracts play a bigger role than actual FDI in the BRI.

Cette thèse de doctorat se focalise sur la fin du Précambrien, le Néoprotérozoïque, une période charnière dans lhistoire de la Terre, par létude dunités ophiolitiques datées entre 800 et 700 Ma. Les travaux présentés ici portent sur létude pétrographique, géochimique et magnétique des serpentinites de ces ophiolites. Associées à des sutures panafricaines en bordure des cratons ouest africain et amazonien, ces ophiolites sont les témoins des subductions et de la lithosphère océanique associées à la dislocation du supercontinent Rodinia. Létude de ces ophiolites permet de proposer des contextes de formation pour ces sections de lithosphère océanique. Une autre question à lorigine de ce travail était : Létude de la serpentinisation et de lhydrothermalisme associé permet-elle dapporter des contraintes sur le paléoenvironnement océanique ? Les travaux sur les serpentinites et les roches mafiques associées des unités ophiolitiques de lAraguaia belt (757 ± 49 Ma1, Brésil) constituent la première étude géochimique réalisée sur ces unités. La chimie des spinelles couplée à des travaux de modélisation géochimique, portant essentiellement sur les concentrations en REE, attestent dun protolithe hautement réfractaire, ayant enduré entre 14 et 24 % de fusion partielle. Ces travaux témoignent aussi de laffinité abyssale de ces serpentinites, confirmée par les signatures N-MORB et E-MORB des basaltes associés. Il apparait que la serpentinisation de ces unités sest probablement opérée en deux temps, en domaine océanique, puis par interaction avec des fluides dérivés des sédiments encaissants, aboutissant à de forts enrichissements en LILE, en B et en Li dans ces serpentinites. Finalement, nous proposons que ces sections de lithosphère océanique, ainsi que les métasédiments les abritant (Tocantins group), soient les reliques dune transition océan-continent (TOC) en bordure est du craton amazonien. Les études de terrain, pétrographiques et géochimiques sur les sections ophiolitiques de Khzama (762 ± 2 Ma2) et dAït Ahmane (Anti-Atlas, Maroc) ont dans un premier temps permis de confirmer le lien supposé entre ces deux ophiolites. Les spinelles des serpentinites de ces unités sont caractérisés par des Cr# très élevés et des Mg# bas témoignant dun protolithe ayant enduré des taux de fusion supérieurs à 25 %, confirmant leur affinité avec la zone de subduction anti-atlasique. Ceci est corroboré par de très faibles concentrations en éléments incompatibles comme Al, Ti, HREE et HFSE. Le contexte le plus probable concernant la genèse de ces sections de lithosphère est ainsi un même centre daccrétion arrière-arc intra-océanique, à la marge du supercontinent Rodinia. Létude comparative des serpentinites de ces ophiolites a aussi permis de mettre en évidence en évidence lintérêt des mesures magnétiques pour tracer le degré daltération des spinelles chromifères dans les serpentinites, approche pouvant être étendue à dautres types de roches. Notamment, nous montrons que la Cr-magnétite et la ferritchromite peuvent être identifiées à laide des mesures de susceptibilité magnétique en chauffe. Enfin, lassociation des méthodes magnétiques, pétrographiques et géochimiques nous permet de proposer un modèle concernant la formation des veines de magnétite massives de lunité dAït Ahmane Nord. Nous montrons que le triptyque : serpentinites et spinelles altérés et veines de magnétite centimétriques, constitue un système hydrothermal abyssal fossile, de type fumeur noir. Dans ce contexte, les compositions isotopiques en oxygène des veines de magnétite permettent de proposer une valeur du 18O des océans néoprotérozoïques profonds de -1.33 ± 0.98 (VSMOW), soit une valeur très similaire à lactuel (entre -1 et +1 VSMOW). Elle tranche aussi le débat sur lévolution du 18O des océans au cours des temps géologiques en attestant dune constance de celui-ci, au moins depuis le Néoprotérozoïque. / This Doctoral thesis focus on the end of the Precambrian, the Neoproterozoic, a pivotal period in the Earth history, by the study of ophiolitic units dated between 800 and 700 Ma. This work essentially deals with the petrography, geochemistry and magnetism of serpentinites from these ophiolites. They are associated with Panafrican orogenic belts along the West African and the Amazonian cratons and witnesses the subductions and the oceanic lithosphere associated to the break-up of the supercontinent Rodinia. The study of these neoproterozoic ophiolites allowed us to propose the formation settings for these sections of oceanic lithosphere. Another question behind this work is: Does the study of serpentinization and associated hydrothermalism allows one to provide constraints on the oceanic paleoenvironment? Work on the serpentinites and associated mafic rocks from the Araguaia belt ophiolitic units (757 ± 49 Ma1, Brazil) constitute the first geochemical study realized on these units. The Cr-spinel chemistry coupled with geochemical modeling, concerning essentially the REE concentrations, attest to a highly refractory protolith that endured between 14 and 24% of partial melting. This work also indicate an abyssal affinity (i.e. MOR rather than SSZ) of these serpentinites, which is confirmed by the N-MORB and E-MORB geochemical signature of the associated basalts. It appears that the serpentinization of these units probably took place in two steps, first in oceanic domain and then by interaction with fluids derived from the surrounding sediments after obduction, leading to strong LILE, B and Li enrichments in the serpentinites. Finally, we propose two potential settings concerning the origin of the sections of oceanic lithosphere presently found in the Araguaia belt: (1) an ocean-continent transition or (2) slices of a more mature lithosphere trapped into an accretionary wedge. Fieldwork, petrography and geochemical analysis on serpentinites from the Khzama (762± 2 Ma²) and Aït Ahmane ophiolitic sections (Anti-Atlas, Morocco) firstly allowed to confirm the supposed link between these two ophiolites. Cr-spinels in serpentinites from these units are characterized by very high Cr# and low Mg# testifying of a protolith having endured partial melting greater the 25%, confirming their affinity with the anti-atlasic subduction zone. This is corroborated by very low incompatible element concentrations such as Al, Ti, HREE and HFSE. Thus, the most likely setting for the genesis of these sections of lithosphere is a same intra-oceanic back-arc spreading center at the margin of the Rodinia supercontinent. The comparative study of all studied serpentinites from Neoproterozoic ophiolites in different settings also demonstrates the ability of magnetic measurements in monitoring the Cr-spinel alteration degree, a method which can be extended to other types of rocks. In particular, we show that Cr-magnetite and ferritchromite can be identified using thermomagnetic curves. Finally, the association of magnetic, petrographic and geochemical methods allows us to propose a model concerning the formation of the massive magnetite veins of the North Aït Ahmane unit. We show that the triptych consisting in: altered serpentinites, spinels and centimetric magnetite veins, results from a fossil, black smoker type, abyssal hydrothermal system. In this context, the oxygen isotopic compositions of the magnetite veins provide a 18O value of the deep Neoproterozoic oceans of -1.33 ± 0.98 (VSMOW), a value that is very similar to the current one (between -1 and +1 VSMOW). It also settles the debate on the evolution of the 18O of the oceans during geological time, attesting of its consistency, at least since the Neoproterozoic.

Cette thèse de doctorat se focalise sur la fin du Précambrien, le Néoprotérozoïque, une période charnière dans l'histoire de la Terre, par l'étude d'unités ophiolitiques datées entre 800 et 700 Ma. Les travaux présentés ici portent sur l'étude pétrographique, géochimique et magnétique des serpentinites de ces ophiolites. Associées à des sutures panafricaines en bordure des cratons ouest africain et amazonien, ces ophiolites sont des vestiges des subductions et de la lithosphère océanique associées à la dislocation du supercontinent Rodinia. L'étude de ces ophiolites permet de proposer des contextes de formation pour ces sections de lithosphère océanique. Une autre question à l'origine de ce travail était : L'étude de la serpentinisation et de l'hydrothermalisme associé permet-elle d'apporter des contraintes sur le paléoenvironnement océanique ? / This Doctoral thesis focus on the end of the Precambrian, the Neoproterozoic, a pivotal period in the Earth history, by the study of ophiolitic units dated between 800 and 700 Ma. This work essentially deals with the petrography, geochemistry and magnetism of serpentinites from these ophiolites. They are associated with Panafrican orogenic belts along the West African and the Amazonian cratons and witnesses the subductions and the oceanic lithosphere associated to the break-up of the supercontinent Rodinia. The study of these neoproterozoic ophiolites allowed us to propose the formation settings for these sections of oceanic lithosphere. Another question behind this work is: Does the study of serpentinization and associated hydrothermalism allows one to provide constraints on the oceanic paleoenvironment?

The thesis presents the design and analysis of a Twin Tensioner for a Belt-driven Integrated Starter-generator (B-ISG) system. The B-ISG is an emerging hybrid transmission closely resembling conventional serpentine belt drives. Models of the B-ISG system's geometric properties and dynamic and static states are derived and simulated. The objective is to reduce the magnitudes of static tension in the belt for the ISG-driving phase. A literature review of hybrid systems, serpentine belt drive modeling and automotive tensioners is included. A parametric study evaluates tensioner parameters with respect to their impact on static tensions. Design variables are selected from these for an optimization study. The optimization uses a genetic algorithm (GA) and a hybrid GA. Results of the optimization indicate the optimal system contains spans with static tensions that are significantly lower in magnitude than that of the original design. Implications of the research on future work are discussed in closing.

The thesis presents the design and analysis of a Twin Tensioner for a Belt-driven Integrated Starter-generator (B-ISG) system. The B-ISG is an emerging hybrid transmission closely resembling conventional serpentine belt drives. Models of the B-ISG system's geometric properties and dynamic and static states are derived and simulated. The objective is to reduce the magnitudes of static tension in the belt for the ISG-driving phase. A literature review of hybrid systems, serpentine belt drive modeling and automotive tensioners is included. A parametric study evaluates tensioner parameters with respect to their impact on static tensions. Design variables are selected from these for an optimization study. The optimization uses a genetic algorithm (GA) and a hybrid GA. Results of the optimization indicate the optimal system contains spans with static tensions that are significantly lower in magnitude than that of the original design. Implications of the research on future work are discussed in closing.

Submitted by José Antonio Cirillo de Assis null (jcirillo.assis@gmail.com) on 2016-05-05T20:30:08Z No. of bitstreams: 1 DissertaçãodeMestrado_JoséAntonioCirilloAssis.pdf: 5445876 bytes, checksum: cffaacc2000b5bdb88bfc9bbd7071d13 (MD5) / Rejected by Felipe Augusto Arakaki (arakaki@reitoria.unesp.br), reason: Solicitamos que realize uma nova submissão seguindo as orientações abaixo: O arquivo submetido está sem a ficha catalográfica. A versão submetida por você é considerada a versão final da dissertação/tese, portanto não poderá ocorrer qualquer alteração em seu conteúdo após a aprovação. Corrija esta informação e realize uma nova submissão contendo o arquivo correto. Agradecemos a compreensão. on 2016-05-09T14:15:22Z (GMT) / Submitted by José Antonio Cirillo de Assis null (jcirillo.assis@gmail.com) on 2016-05-10T11:56:37Z No. of bitstreams: 1 DissertaçãodeMestrado_JoséAntonioCirilloAssis.pdf: 5492695 bytes, checksum: 098f2796a7e2e2a2b876f0e44a85c57b (MD5) / Approved for entry into archive by Felipe Augusto Arakaki (arakaki@reitoria.unesp.br) on 2016-05-13T11:44:14Z (GMT) No. of bitstreams: 1 assis_jac_me_rcla.pdf: 5492695 bytes, checksum: 098f2796a7e2e2a2b876f0e44a85c57b (MD5) / Made available in DSpace on 2016-05-13T11:44:14Z (GMT). No. of bitstreams: 1 assis_jac_me_rcla.pdf: 5492695 bytes, checksum: 098f2796a7e2e2a2b876f0e44a85c57b (MD5) Previous issue date: 2016-03-28 / A análise e identificação do controle estrutural de um depósito de ouro é de grande importância para o estudo e pesquisa da mineralização aurífera, permitindo guiar e otimizar a prospecção e exploração de determinada ocorrência. O objetivo do presente trabalho é definir o empilhamento tectonoestratigráfico e a estruturação do depósito de ouro de C1-Santaluz, bem como seu controle estrutural. Como faz parte de um Greenstone Belt, em uma área de significativa atividade tectônica, esta ocorrência apresenta complexo arcabouço estrutural, havendo a necessidade de compreender melhor as estruturas que influenciam na geometria dos corpos mineralizados. As rochas da área de estudo foram mapeadas na escala 1:750 e foram estudadas através de descrições macroscópicas, microscópicas além de análises em microscópio eletrônico de varredura e análises de difração de raios-x. As unidades encontradas foram subdivididas em dois grandes domínios, sendo da base ao topo, Sequência Vulcânica e Sequência Metassedimentar, compostas por metadacitos e metadacitos brechados, e clorita sericita quartzo xisto, metassedimento carbonoso, brecha carbonosa, respectivamente. Também foi mapeado um corpo de metadiorito que corresponde à unidade Rochas Intrusivas Subvulcânicas Intermediárias. As fases minerais relacionadas com a mineralização aurífera são representadas por sulfetos, tais como, pirita, arsenopirita, esfalerita, calcopirita e stibinita, sendo que a arsenopirita mostrou relação direta com a presença de ouro, este ocorrendo associado ao sulfeto. Ao todo foram identificadas 3 fases deformacionais: Dn-1, Dn, Dn+1. Dentre essas fases, observa-se que a presença da mineralização na área de estudo possui direta relação com as fases Dn-1 ou Dn, visto que os veios de quartzo mineralizados se encontram encaixados na foliação Sn. A interação entre o bandamento composicional S0//Sn-1 e a foliação Sn gera lineação de intersecção paralela aos eixos de dobra Dn, com caimento para NW. A orientação dessa lineação é favorável para o posicionamento do corpo de minério, podendo apresentar inclusive espessuras maiores nessa orientação. As rochas que compõem as unidades mapeadas apresentaram metamorfismo regional progressivo na fácies xisto verde baixo, zona da biotita. / Structural control plays a major role in gold deposits. Thus, understanding the different structures present in the area, as well as the relationship between these structures, is a key issue. This work aims to identify the structural control of the gold deposit of C1-Santaluz. It also presents the tectono-stratigraphic stacking of the rocks and the main deformation phases that occur in the area. The C1-Santaluz deposit is located in a Greenstone Belt and has a complex structural setting. Therefore, there is a need to better understand the structures that can influence the geometry of the mineralized bodies. The rocks of the study area were mapped in 1:750 scale. The study was carried out through macroscopic and microscopic description of rocks, as well as scanning electron microscope and of x-ray diffraction analyses. The rock units that occur in the area were divided in two main domains, base to top, Sequência Vulcânica and Sequência Metassedimentar. The mineral paragenesis related to the auriferous mineralization is represented by sulphides, pyrite, arsenopyrite, sphalerite, chalcopyrite and stibnite. Arsenopyrite showed direct relation with the presence of gold, detected by scanning electron microscope analysis. A total of 3 deformational phases were identified: Dn-1, Dn, Dn+1. Phase Dn-1 and Dn have direct relation with the mineralization since mineralized quartz veins occur parallel to the Sn foliation (S0//Sn-1//Sn). The intersection between the bedding S0//Sn-1 and Sn foliation generates an intersection lineation that is parallel to the Dn fold axis, plunging to NW. These structures are favorable for the increase of the volume of the mineralized bodies, plunging to NW. The rocks were metamorphosed under lower greenschist facies conditions (biotite zone).

Made available in DSpace on 2010-04-20T20:20:40Z (GMT). No. of bitstreams: 1 176520.pdf: 1445908 bytes, checksum: a8c0b0e8050904f8ad266e52e72c18cf (MD5) Previous issue date: 2007-12-05T00:00:00Z / Esse trabalho tem como principal objetivo analisar e montar um quadro referencial de três casos de sucesso que utilizaram a metodologia Seis Sigma. Os projetos ocorreram na área de manufatura e em períodos e processos diferentes de uma empresa do setor de Papel e Celulose. A metodologia utilizada para fazer a dissertação foi o estudo de caso múltiplo. Foram entrevistados os Champions dos projetos, um Green Belt, o Black Belt e o Líder do programa Seis Sigma responsáveis pelos três projetos. Foram também utilizadas todas as informações geradas durante a realização dos projetos como sumário executivo, comportamento dos indicadores, e resultados. A análise destes casos mais a revisão bibliográfica possibilitou montar um quadro referencial dos fatores críticos para o sucesso. Os fatores críticos significativos identificados foram liderança, gestão, projetos, comunicação e acompanhamento, e treinamento. Este quadro será utilizado para nortear a implantação dos próximos projetos na empresa estudada. Foi possível também avaliar o impacto positivo do programa Seis Sigma no desempenho operacional, satisfação dos clientes e na cultura de qualidade dos funcionários participantes dos projetos.

Depuis au moins 540 Ma deux grands systèmes de subduction coexistent sur Terre : d'une part, les systèmes de subduction-collision (chaînes Hercynienne, Himalayenne ou Alpine) et d'autre part, les systèmes de subduction de type péri-pacifique. Pour ces derniers, l'avant-arc constitue une zone clef pour retracer l'évolution de la subduction au cours du temps. En effet ces zones au contact avec le slab peuvent enregistrer des événements tectoniques et/ou des conditions métamorphiques variées (e.g. formation de « paired metamorphic belts »), qui sont autant d'indicateurs du contexte géodynamique. Le massif métamorphique de El Oro en Equateur est un exemple exeptionnel où une section complète et basculée de l'avant-arc Triasique est préservée. L'ensemble est constitué d'une série métasédimentaire de bas à haut grade métamorphique intrudée par des granitoïdes de type S, juxtaposé avec un laccolithe gabbroïque et des schistes bleus. Ce travail de thèse s'est concentré sur l'étude du métamorphisme de haute-température basse-pression et ses relations les schistes bleu. Afin de contraindre l'événement tectono-métamorphique affectant l'avant-arc Equatorien au Trias et la formation d'une "paired metamorphic belt", nous avons utilisé des outils structuraux, métamorphiques, géochimiques, géochronologiques et de modélisation thermique. Nos résultats montrent que durant cette période l'avant-arc Equatorien connait un intense épisode de fusion partielle en régime extensif. La base de la croûte est migmatisée sur une épaisseur de 10km. Les estimations Pression-Température indiquent que les conditions de fusion partielle varient de 4.5 kbar et 650°C pour la partie supérieure métaxitique et jusqu'à 7.5 kbar et 720°C pour la partie inférieure diatexitique. La gradient géothermique inféré est divisé en deux segments : un segment supérieur caractérisé par un gradient de 40°C/km et un segment inférieur caractérisé par un gradient quasi-isothermique. L'absence de paragénèse de ultra-haute température est attribuée à la grande fertilité du protolithe métasédimentaire. Les résultats géochimiques montrent que les plutons granodioritiques sont issus d'un mélange entre : (1) les liquides de fusion partielle produit par la réaction de deshydration de la muscovite des métasédiments et (2) un magma basique. Les âges U-Pb sur zircons et monazites révèlent que l'événement anatectique fût bref entre 229 et 225 Ma. La source de chaleur à l'origine de l'événement thermique est attribuée à la mise en place d'un pluton gabbroïque à ~ 230 Ma en base de croûte. Successivement, se sous-plaque les schistes-bleu refroidissant rapidement l'avant-arc. L'événement anatectique observé dans le massif de El Oro au Trias s'insrit à plus grande échelle au sein d'une large anomalie thermique affectant l'ensemble du continent sud Américain entre 260 et 220 Ma. Durant cette période la marge est un soumise à un régime extensif accompagné d'un important magmatisme d'origine crustal, principalement en position d'arc et d'avant-arc. Nous attribuons cette anomalie thermique d'ampleur continental à une "avalanche mantellique". A la lumière du contexte géodynamique globale nous inteprétons la formation de la paired metamorphic belt de El Oro à la rupture du slab. / Since about 540 Ma, two subductions systems co-exist on Earth: the subduction-collision systems (Hercynian, Himalayan or Alpin belts) and the circum-pacific subduction system. For the last the forearc region constitutes a key zone to understand the dynamic of the subduction. Indeed the forearc region in contact with the slab may records various tectonics events and/or metamorphic conditions (e.g. formation of paired metamorphic belt). Theses geological records are direct evidences of the linked geodynamical context. The El Oro metamorphic complex in Ecuador is a unique example where a whole Triassic forearc section is tilted and well preserved. The complex is made of low to high grade metasedimentary rocks intruded by S-type granitoids, juxtaposed with gabbroic rocks and blueschists. This study is focused on the high-temperature metamorphism and its retionaships with the high-pressure metamorphism. In order to constrain the tectono-metamorphic affecting the forearc region and the formation of a paired metamorphic belt we used strutural, metamorphic, geochemical, geochronological and themal modeling studies. Our results show that during Triassic times the Ecuadorian forearc underwent a strong episode of partial melting in extentional context. The migmatized part of crust is 10 km thick. Pressure-Temperature estimates indicate that partial melting started at 4.5 kbar and 650°C for the upper metatexitic part until 7.5 kbar and 720 °C for the lower diatexitic part. The resulting geothermal gradient exhibits two parts: an upper part caracteristed by a thermal gradient of 40°C/km and a lower part caractérized by a near-adiabatic gradient. The absence of ultra-high tempetature paragenesis is attributed to the high fertility of the metasedimentary protolith. Geochemical results show that granodiorite made of a miwing between: (1) the melt extacted under muscovite dehydration melting and (2) a basic magma. U-Pb ages on zircon and monazite reveal that the anatectic event was short, between 229 and 225 Ma. The origin of the thermal anomaly is attributed to the emplacement of the gabbroic plutonic unit at ~230 at root level. Successively, the blueschites are underplating triggering a strong coolng of the forearc region. The anatectic recorded in the El Oro metamorphic complex at Triassic times is part of a larger thermal anomaly affecting the whole south american margin between 260 and 220 Ma. During this period the margin is under extentional conditions and exhibit a strong S-type magmatic activity. This magmatism is mainly located in arc and forearc position. We attribute this large-scale thermal anomaly to slab fall in the lower mantle. In the light of the geodynamical context, we suggest that the formation of the El Oro paired metamorphic belt is related to slab breakoff.