Modelo lito-geofísico del Cratón Amazónico en el Oriente Colombiano a partir de la integración de información geofísica

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dc.contributor.advisorPrieto Gómez, Germán Andrés
dc.contributor.authorMoyano Nieto, Ismael Enrique
dc.date.accessioned2023-01-12T15:02:34Z
dc.date.available2023-01-12T15:02:34Z
dc.date.issued2021-11-19
dc.descriptionilustraciones, graficas, mapasspa
dc.description.abstractEl Cratón Amazónico es una de las áreas cratónicas más grandes del mundo. El modelo geológico del Cratón en Colombia es poco conocido, principalmente porque una gran porción de las rocas asociadas a este cratón se encuentra cubiertas por secuencias sedimentarias y depósitos recientes, sumado a poca accesibilidad y densa cobertura selvática. Los modelos más aceptados para el Cratón amazónico indican que este evolucionó por acreción múltiple de cinturones/terrenos alrededor de un núcleo antiguo, pero estudios recientes sugieren que la evolución de la porción Noroccidental puede haber sido diferente de las áreas en donde se formularon dichos modelos. En el presente trabajo utilizamos datos geofísicos (magnéticos/gravimétricos), aplicando metodologías de detección multi-escala de bordes y modelado 3D que permitieron identificar y delinear las principales discontinuidades corticales para el Cratón amazónico en territorio colombiano, además de otras características geológicas. Se identificaron lineamientos geofísicos primarios (PGL), interpretados como posibles límites de la corteza. A partir de la interpretación geofísica, integrada con información geológica, geocronológica e isotópica, se proponen cinco dominios tectónicos: Ventuari-Tapajós, Cinturón de Atabapo, Cinturón de Vaupés, Rift Apaporis y Putumayo. Se presenta una nueva edad de cristalización de circón U-Pb para la Formación Piraparaná, que indica que es significativamente más antigua de lo que se pensaba anteriormente, implicando que la extensión en el Rift de Apaporis comenzó al menos en el Mesoproterozoico tardío, transformando así por completo su significado tectónico. Los límites estructurales propuestos corroboran y proporcionan una ubicación más precisa de los límites sugeridos previamente y que estaban difusamente delineados a partir de la información geológica y geocronológica disponible. Este trabajo presenta por primera vez un modelo geológico regional a escala cortical para el noroeste del Cratón Amazónico en Suramérica a partir de la integración de información geofísica, mejorando la comprensión de la estructura regional de esta parte del continente (Texto tomado de la fuente)spa
dc.description.abstractThe Amazon Craton is one of the largest cratonic areas in the world. The geological evolution of the Craton in Colombia is not well constrained, mainly because a large portion of the rocks associated with this craton are covered by sedimentary sequences and recent deposits, in addition to low accessibility and dense forest cover. The most accepted models for the Amazon Craton indicate that it evolved by multiple accretion of belts / terrains around an ancient nucleus. Recent studies suggest that the evolution of the Northwestern portion may have been different from the areas where these models were formulated. In the present work geophysical data (magnetic / gravimetric) were used, applying multi-scale edge detection methodology and 3D modeling that allowed to identify and delineate the main cortical discontinuities for the Amazon Craton in Colombia and other geological characteristics. Primary geophysical lineaments (PGL) were identified, interpreted as possible crustal boundaries. From geophysical interpretation, integrated with geology, geochronology and isotopic information, five tectonic domains are proposed: Ventuari-Tapajós, Atabapo Belt, Vaupés Belt, Apaporis Rift and Putumayo. A new U-Pb zircon crystallization age is presented for the Piraparaná Formation, indicating that it is significantly older than previously thought, and that the extension into the Apaporis Rift began at least in the late Mesoproterozoic, thus transforming its full tectonic significance. The proposed structural boundaries are in agreement and provide a more precise location of the previously suggested boundaries, loosely constrained to available geological and geochronological information. This work presents the first regional geological model at a cortical scale for the northwest of the Amazon Craton in South America using geophysical methods, improving the understanding of the regional structure of this part of the continent.eng
dc.description.degreelevelDoctoradospa
dc.description.degreenameDoctor en Geocienciasspa
dc.description.researchareaGeofísica aplicada a modelos geológicos regionalesspa
dc.format.extentxviii, 117 páginasspa
dc.format.mimetypeapplication/pdfspa
dc.identifier.instnameUniversidad Nacional de Colombiaspa
dc.identifier.reponameRepositorio Institucional Universidad Nacional de Colombiaspa
dc.identifier.repourlhttps://repositorio.unal.edu.co/spa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/82891
dc.language.isospaspa
dc.language.isoengspa
dc.publisherUniversidad Nacional de Colombiaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Bogotáspa
dc.publisher.facultyFacultad de Cienciasspa
dc.publisher.placeBogotá, Colombiaspa
dc.publisher.programBogotá - Ciencias - Doctorado en Geocienciasspa
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dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseAtribución-SinDerivadas 4.0 Internacionalspa
dc.rights.urihttp://creativecommons.org/licenses/by-nd/4.0/spa
dc.subject.ddc550 - Ciencias de la tierra::551 - Geología, hidrología, meteorologíaspa
dc.subject.lembGEOLOGIA-COLOMBIAspa
dc.subject.lembGeology - Colombiaeng
dc.subject.lembGEOLOGIA-PROCESAMIENTO DE DATOSspa
dc.subject.lembGeology - data processingeng
dc.subject.proposalCratón Amazónicospa
dc.subject.proposalAmazon Cratoneng
dc.subject.proposalIntegración geológica-geofísicaspa
dc.subject.proposalMétodos Magnético y Gravimétricospa
dc.subject.proposalModelos geológicos regionalesspa
dc.subject.proposalGeophysical-geological integrationeng
dc.subject.proposalMagnetic and gravity methodseng
dc.subject.proposalRegional geological modelseng
dc.titleModelo lito-geofísico del Cratón Amazónico en el Oriente Colombiano a partir de la integración de información geofísicaspa
dc.title.translatedLitho-geophysical model of the Amazon Craton in Eastern Colombia based on the integration of geophysical informationeng
dc.typeTrabajo de grado - Doctoradospa
dc.type.coarhttp://purl.org/coar/resource_type/c_db06spa
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aaspa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/doctoralThesisspa
dc.type.redcolhttp://purl.org/redcol/resource_type/TDspa
dc.type.versioninfo:eu-repo/semantics/acceptedVersionspa
dcterms.audience.professionaldevelopmentEstudiantesspa
dcterms.audience.professionaldevelopmentInvestigadoresspa
dcterms.audience.professionaldevelopmentMaestrosspa
dcterms.audience.professionaldevelopmentMedios de comunicaciónspa
dcterms.audience.professionaldevelopmentPúblico generalspa
dcterms.audience.professionaldevelopmentReceptores de fondos federales y solicitantesspa
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2spa

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