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Aproximación termodinámica al estudio de filosilicatos en paleosuelos de La Tatacoa

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dc.contributor.advisorSalazar Jaramillo, Susana
dc.contributor.authorGómez Herrera, Christian Fernando
dc.contributor.educationalvalidatorPérez Naranjo, Juan Carlos
dc.contributor.orcidGómez Herrera, Christian Fernando [0000000320008774]
dc.contributor.orcidSalazar Jaramillo, Susana [0000000252282228]
dc.contributor.orcidPérez Naranjo, Juan Carlos [000000031945286X]
dc.date.accessioned2026-02-16T18:33:25Z
dc.date.available2026-02-16T18:33:25Z
dc.date.issued2025-04-21
dc.descriptionIlustraciones, mapas
dc.description.abstractEsta investigación aplica un enfoque geoquímico y termodinámico para interpretar discrepancias mineralógicas en paleosuelos de La Tatacoa (Huila, Colombia). Se estudiaron tres perfiles de paleosuelo: uno gris-verdoso (PV, Formación La Victoria; ~13.6–13.1 Millones de años (Ma)) y dos rojos (FRB y LVRB, Formación Villavieja; ~13.1–12.0 Ma). El análisis mineralógico (DRX/FRX) reveló un desequilibrio químico en PV, con acumulación de nontronita (esmectita) no coherente con los diagramas de estabilidad en los sistemas Al₂O₃-MgO-Na₂O-K₂O-SiO₂-H₂O. En contraste, los perfiles FRB y LVRB mostraron proporciones estables de filosilicatos 1:1 y 2:1, coherentes con un ensamblaje en equilibrio. Se usaron proxies geoquímicos para reconstruir el pH del suelo y se integraron con modelos termodinámicos y diagramas de estabilidad, permitiendo distinguir minerales formados in situ de aquellos de origen alóctono (e.g., retrabajo de cenizas volcánicas). Además, se realizaron experimentos en columnas de Winogradsky y monitoreo multiespectral durante 8 meses, donde PV presentó mayor hinchamiento y liberación de Fe+3, sugiriendo degradación de nontronita y acidificación potencialmente microbiana. El perfil LVRB mostró estabilidad relativa de goethita y cambios espectrales compatibles con liberación de hierro férrico. Estos resultados evidencian que el equilibrio termodinámico es útil para interpretar el origen y transformación de arcillas en paleosuelos y para inferir transiciones paleoambientales entre condiciones húmedas y secas durante el Mioceno medio. (Texto tomado de la fuente)spa
dc.description.abstractThis research applies a geochemical and thermodynamic approach to interpret mineralogical discrepancies in paleosols from La Tatacoa (Huila, Colombia). Three profiles were analyzed: one gray greenish colored (PV, La Victoria Formation; ~13.6–13.1 Ma) and two red colored (FRB and LVRB, Villavieja Formation; ~13.1–12.0 Ma). Mineralogical analyses (XRD/XRF) revealed a chemical disequilibrium in PV, with nontronite (a smectite) accumulation inconsistent with stability diagrams in the Al₂O₃-MgO-Na₂O-K₂O-SiO₂-H₂O systems. In contrast, FRB and LVRB profiles showed stable proportions of 1:1 and 2:1 phyllosilicates, coherent with equilibrium assemblages. Soil pH was reconstructed using geochemical proxies and integrated into thermodynamic models and mineral stability diagrams, enabling discrimination between in situ-formed and allochthonous clays (e.g., reworked volcanic ash). Additionally, Winogradsky column experiments and 8-month multispectral monitoring showed greater swelling and Fe+3 release in PV, suggesting nontronite degradation and microbially driven acidification. LVRB exhibited relative goethite stability and spectral changes linked to ferric iron release. These results demonstrate that thermodynamic equilibrium is a valuable tool to interpret the origin and transformation of clays in paleosols and to infer paleoenvironmental transitions between wetter and drier conditions during the Middle Miocene.eng
dc.description.curricularareaCiencias Naturales.Sede Medellín
dc.description.degreelevelMaestría
dc.description.degreenameMagister en ciencias - Geomorfología y suelos
dc.description.methodsSe llevó a cabo planteamiento de un modelo termodinámico - geoquímico mediante el uso de información termodinámica disponible en bases de datos, para modelar situaciones de equilibrio químico entre especies minerales presentes en los suelos de La Victoria y Villavieja, de la región de La Tatacoa. El desarrollo contempla dos sistemas de modelamiento: uno basado en los equilibrios a partir de aluminio y silicio, y otro basado en elementos comunes a los minerales presentes, como sodio, potasio y magnesio.
dc.description.notesspa
dc.description.researchareaGeoquímica y pedogénesis
dc.format.extent1 recurso en líne (108 páginas)
dc.format.mimetypeapplication/pdf
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/89566
dc.language.isospa
dc.publisherUniversidad Nacional de Colombia
dc.publisher.branchUniversidad Nacional de Colombia - Sede Medellín
dc.publisher.facultyFacultad de Ciencias
dc.publisher.placeMedellín, Colombia
dc.publisher.programMedellín - Ciencias - Maestría en Ciencias - Geomorfología y Suelos
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dc.rights.accessrightsinfo:eu-repo/semantics/openAccess
dc.rights.licenseReconocimiento 4.0 Internacional
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subject.ddc550 - Ciencias de la tierra
dc.subject.lembGeoquímica
dc.subject.lembEquilibrio termodinámico
dc.subject.lembBiogeoquímica
dc.subject.proposalPaleosuelosspa
dc.subject.proposalFilosilicatosspa
dc.subject.proposalEquilibrio termodinámicospa
dc.subject.proposalDiagrama de estabilidad mineralspa
dc.subject.proposalBiogeoquímicaspa
dc.subject.proposalPaleosolseng
dc.subject.proposalPhyllosilicateseng
dc.subject.proposalThermodynamic equilibriumeng
dc.subject.proposalMineral stability diagrameng
dc.subject.proposalBiogeochemistryeng
dc.titleAproximación termodinámica al estudio de filosilicatos en paleosuelos de La Tatacoaspa
dc.title.translatedThermodynamic approach to the study of phyllosilicates in paleosols from La Tatacoaeng
dc.typeTrabajo de grado - Maestría
dc.type.coarhttp://purl.org/coar/resource_type/c_bdcc
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.contentText
dc.type.driverinfo:eu-repo/semantics/masterThesis
dc.type.redcolhttp://purl.org/redcol/resource_type/TM
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
dcterms.audience.professionaldevelopmentEstudiantes
dcterms.audience.professionaldevelopmentInvestigadores
dcterms.audience.professionaldevelopmentEspecializada
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2

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Tesis de Maestría en ciencias - Geomorfología y suelos
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Maestría en Ciencias - Geomorfología y Suelos