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Evolución tectónica y metamórfica del complejo raspas (sur oeste de Ecuador)
dc.rights.license | Atribución-NoComercial 4.0 Internacional |
dc.contributor.advisor | Zuluaga Castrillón, Carlos Augusto |
dc.contributor.advisor | Ibáñez Mejía, Mauricio |
dc.contributor.author | Arrieta Prieto, Mayda Catalina |
dc.date.accessioned | 2023-12-12T15:49:21Z |
dc.date.available | 2023-12-12T15:49:21Z |
dc.date.issued | 2023-12 |
dc.identifier.uri | https://repositorio.unal.edu.co/handle/unal/85071 |
dc.description | ilustraciones, mapas, planos |
dc.description.abstract | Los complejos de alta Presión que se encuentran a lo largo de la superficie terrestre proporcionan evidencia de los procesos involucrados tanto en la cristalización de las rocas en el canal de subducción como en su exhumación. Dichos procesos son clave para comprender la dinámica y la evolución de las zonas de subducción (por ejemplo, a través de la reconstrucción de trayectorias P-T). El complejo Raspas (suroeste de Ecuador) contiene rocas de alta Presión como eclogitas y esquistos anfibólicos con las asociaciones minerales estables correspondientes a glaucofana + granate + epidota + onfacita + mica blanca + rutilo ± cuarzo ± apatita ± pirita ± calcita. Este complejo se ha relacionado genéticamente con los procesos de acreción y subducción de los montes submarinos, que ocurrieron en América del Sur durante el Jurásico Superior - Cretácico Inferior, y la exhumación del complejo probablemente estuvo relacionada con la dinámica dentro de los canales de subducción. Este trabajo muestra una combinación de nuevas observaciones petrográficas, datos de química de rocas completas y datos de química mineral utilizados para determinar las condiciones metamórficas máximas para las rocas de alta Presión del complejo y para reconstruir las trayectorias P-T. El modelado termodinámico muestra que después del pico de metamorfismo en la facies eclogita (ca. 15.5-21 Kbar y 630 - 700°C) algunas de las rocas del Complejo registraron un evento retrógrado probablemente causado por su exhumación. La interpretación del proceso retrógrado es consistente con los resultados de termometría de zircón en rutilo, barometría elástica de inclusiones cuarzo en granate, modelado PT con múltiples reacciones y la presencia de microestructuras retrógradas como anfíbol reemplazando piroxeno, cloritización de granate, cristalización de plagioclasa y reemplazo de rutilo por titanita. (Texto tomado de la fuente) |
dc.description.abstract | High-pressure complexes along the Earth's surface provide evidence of the processes involved in both the crystallization of rocks in the subduction channel and its exhumation. Such processes are key to understand the dynamics and evolution of subduction zones (e.g., through reconstruction of P-T trajectories). The Raspas complex (southwestern Ecuador) contains high pressure rocks such as eclogites and amphibolic schists with the mineral assemblages glaucophane + garnet + epidote + omphacite + white mica + rutile ± quartz ± apatite ± pyrite ± calcite stabilized. This complex has been genetically related to accretion and subduction processes of seamounts, which occurred in South America during Late Jurassic - Early Cretaceous, and the exhumation of the complex was probably related to dynamics within subduction channels. This work shows a combination of new petrographic observations, whole-rock chemistry data, and mineral chemistry data used to determine peak metamorphic conditions for the high-pressure rocks of the complex and to reconstruct P-T trajectories. Thermodynamic modelling shows that after peak metamorphism in eclogite facies (ca. 15.5- 21 Kbar and 630 - 700°C) some of the rocks from the Complex recorded a retrograde event probably caused by its exhumation. The interpretation of the retrograde process is consistent with results from zircon in rutile thermometry, quartz in garnet elastic barometry, PT modeling with multiple reactions and the presence of retrograde microstructures such as amphibole replacing pyroxene, garnet chloritization, plagioclase crystallization and rutile replacement by titanite. |
dc.format.extent | 123 página |
dc.format.mimetype | application/pdf |
dc.publisher | Universidad Nacional de Colombia |
dc.rights.uri | http://creativecommons.org/licenses/by-nc/4.0/ |
dc.title | Evolución tectónica y metamórfica del complejo raspas (sur oeste de Ecuador) |
dc.type | Trabajo de grado - Maestría |
dc.type.driver | info:eu-repo/semantics/masterThesis |
dc.type.version | info:eu-repo/semantics/acceptedVersion |
dc.publisher.program | Bogotá - Ciencias - Maestría en Ciencias - Geología |
dc.coverage.country | Ecuador |
dc.description.degreelevel | Maestría |
dc.description.researcharea | Geoquímica y petrología metamórfica |
dc.identifier.instname | Universidad Nacional de Colombia |
dc.identifier.reponame | Repositorio Institucional Universidad Nacional de Colombia |
dc.identifier.repourl | https://repositorio.unal.edu.co/ |
dc.publisher.faculty | Facultad de Ciencias |
dc.publisher.place | Bogotá, Colombia |
dc.publisher.branch | Universidad Nacional de Colombia - Sede Bogotá |
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dc.rights.accessrights | info:eu-repo/semantics/openAccess |
dc.subject.lemb | Geotectónica |
dc.subject.lemb | Geology, structural |
dc.subject.lemb | Fallas (geología) |
dc.subject.lemb | Faults (geology) |
dc.subject.proposal | Complejo |
dc.subject.proposal | Canal de subducción |
dc.subject.proposal | Metamorfismo |
dc.subject.proposal | Metamorfismo retrógrado |
dc.subject.proposal | Eclogitas |
dc.subject.proposal | Complex |
dc.subject.proposal | Subduction channel |
dc.subject.proposal | Metamorphism |
dc.subject.proposal | Retrograde metamorphism |
dc.subject.proposal | Eclogites |
dc.title.translated | Metmorphic and tectonic evolution of raspas complex (southwestern Ecuador |
dc.type.coar | http://purl.org/coar/resource_type/c_bdcc |
dc.type.coarversion | http://purl.org/coar/version/c_ab4af688f83e57aa |
dc.type.content | Text |
dc.type.redcol | http://purl.org/redcol/resource_type/TM |
oaire.accessrights | http://purl.org/coar/access_right/c_abf2 |
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