Paleomagnetismo en la Provincia Volcano-tectónica San Diego – Cerro Machín

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dc.contributor.advisorMejía Bernal, Victoria
dc.contributor.authorGómez Colonia, Luis Felipe
dc.date.accessioned2024-10-28T21:02:44Z
dc.date.available2024-10-28T21:02:44Z
dc.date.issued2024
dc.descriptionfotografías, graficas, tablasspa
dc.description.abstractSe llevó a cabo un estudio paleomagnético al noroeste del Volcán Nevado del Ruiz, que abarcó 17 sitios, representando domos y flujos de lava. Se realizaron análisis de desmagnetización termal y por campo alterno, susceptibilidad magnética vs temperatura, curvas de histéresis, magnetización remanente isotermal y campo inverso, y anisotropía de susceptibilidad magnética (AMS). Los resultados del análisis direccional fueron interpretables para 13 sitios, evidenciando 7 con polaridad normal y 4 con polaridad inversa, en concordancia con las edades asignadas en estudios previos (<45 ka a 1.97 Ma) relacionadas con el cron Brunhes (7 sitios) y Matuyama (4 sitios). Adicionalmente, 2 polaridades intermedias también fueron encontradas. Los análisis de susceptibilidad versus temperatura revelaron dos rangos de temperaturas de transición: de 300°C a 350°C y de 400°C a 550°C. Estos indicaron la presencia de una (8 sitios) o dos (8 sitios) fases mineralógicas, consistentes con la presencia de titanomagnetitas y/o titanohematitas. Las curvas irreversibles indicaron la presencia de maghemita y titanomaghemita en sitios afectados por actividad hidrotermal, originada al sureste del segmento Termales de la falla Villamaría – Termales. Los resultados de AMS de 14 sitios proporcionaron información valiosa sobre las condiciones de emplazamiento de la lava, con anisotropía planar, indicando el plano de un flujo de lava (elipsoide oblado, 4 sitios), y anisotropía triaxial (7 sitios) y lineal (elipsoide prolato, 3 sitios), indicando la base de un domo y la parte alta de un domo o un flujo de lava, respectivamente (Texto tomado de la fuente)spa
dc.description.abstractA paleomagnetic study was conducted northwest of the Nevado del Ruiz Volcano, covering 17 sites, representing domes and lava flows. Thermal and alternating field demagnetization analyses were performed, along with magnetic susceptibility vs temperature, hysteresis curves, isothermal remanent magnetization and backfield, and anisotropy of magnetic susceptibility (AMS). The directional analysis results were interpretable for 13 sites, revealing 7 with normal polarity, 4 with reverse polarity, consistent with previously assigned ages (<45 ka to 1.97 Ma) related to the Brunhes (7 sites) and Matuyama (4 sites) chrons. Additionally, 2 intermediate polarities were also found. The magnetic susceptibility vs temperature analyses revealed two transition temperature ranges: from 300°C to 350°C and from 400°C to 550°C. These indicated the presence of one (8 sites) or two (8 sites) mineralogical phases, consistent with the presence of titanomagnetites and/or titanohematites. The irreversible curves indicated the presence of maghemite and titanomaghemite in sites affected by hydrothermal activity, originating southeast of the Termales segment of the Villamaría–Termales fault. AMS results from 14 sites provided valuable information about the lava emplacement conditions, with planar anisotropy indicating the plane of a lava flow (oblate ellipsoid, 4 sites), while triaxial (7 sites) and linear (prolate ellipsoid, 3 sites) anisotropy indicated the base of a dome and the upper part of a dome or a lava flow, respectively.eng
dc.description.curricularareaCiencias Naturales.Sede Manizalesspa
dc.description.degreelevelMaestríaspa
dc.description.degreenameMagíster en Ciencias - Físicaspa
dc.description.researchareaPaleomagnetismo y geofísica ambientalspa
dc.format.extentxvi, 75 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/87085
dc.language.isospaspa
dc.publisherUniversidad Nacional de Colombiaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Manizalesspa
dc.publisher.facultyFacultad de Ciencias Exactas y Naturalesspa
dc.publisher.placeManizales, Colombiaspa
dc.publisher.programManizales - Ciencias Exactas y Naturales - Maestría en Ciencias - Físicaspa
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dc.relation.referencesVillagómez, D., Spikings, R., Magna, T., Kammer, A., Winkler, W., & Beltrán, A. (2011). Geochronology, geochemistry and tectonic evolution of the Western and Central cordilleras of Colombia. Lithos, 125(3–4), 875–896. https://doi.org/10.1016/j.lithos.2011.05.003spa
dc.relation.referencesVinasco, C. J., Cordani, U. G., González, H., Weber, M., & Pelaez, C. (2006). Geochronological, isotopic, and geochemical data from Permo-Triassic granitic gneisses and granitoids of the Colombian Central Andes. Journal of South American Earth Sciences, 21(4), 355–371. https://doi.org/10.1016/j.jsames.2006.07.007spa
dc.relation.referencesWang, D., & Van der Voo, R. (2004). The hysteresis properties of multidomain magnetite and titanomagnetite/titanomaghemite in mid-ocean ridge basalts. Earth and Planetary Science Letters, 220(1–2), 175–184. https://doi.org/10.1016/S0012-821X(04)00052-4spa
dc.relation.referencesWasilewski, P. J. (1973). Magnetic hysteresis in natural materials. Earth and Planetary Science Letters, 20(1), 67–72. https://doi.org/10.1016/0012-821X(73)90140-4spa
dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseReconocimiento 4.0 Internacionalspa
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/spa
dc.subject.ddc550 - Ciencias de la tierra::551 - Geología, hidrología, meteorologíaspa
dc.subject.proposalPaleomagnetismospa
dc.subject.proposalVulcanismo monogenéticospa
dc.subject.proposalRemanencia magnéticaspa
dc.subject.proposalAnisotropía de susceptibilidad magnéticaspa
dc.subject.proposalTemperatura de transiciónspa
dc.subject.proposalPaleomagnetismeng
dc.subject.proposalMonogenetic volcanismeng
dc.subject.proposalMagnetic remanenceeng
dc.subject.proposalTransition temperatureeng
dc.subject.proposalAnisotropy of magnetic susceptibilityeng
dc.subject.unescoTectónicaspa
dc.subject.unescoVolcanologíaspa
dc.subject.unescoFallas geológicasspa
dc.titlePaleomagnetismo en la Provincia Volcano-tectónica San Diego – Cerro Machínspa
dc.title.translatedPaleomagnetism in the San Diego - Cerro Machin Volcano-tectonic Provinceeng
dc.typeTrabajo de grado - Maestríaspa
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aaspa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa
dc.type.versioninfo:eu-repo/semantics/acceptedVersionspa
dcterms.audience.professionaldevelopmentBibliotecariosspa
dcterms.audience.professionaldevelopmentEstudiantesspa
dcterms.audience.professionaldevelopmentInvestigadoresspa
dcterms.audience.professionaldevelopmentPúblico generalspa
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2spa

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