Caracterización petrográfica y geoquímica del Monzogranito de Mocoa en el sur de los Andes Colombianos e implicaciones para su evolución magmática

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2025
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Universidad de Caldas
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Repositorio Institucional U. Caldas
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spa
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550 - Ciencias de la tierra::551 - Geología, hidrología, meteorología
1. Ciencias Naturales
Monzogranito de Mocoa
Jurásico
Zona de subducción
Geoquímica
Petrogénesis
Mocoa Monzogranite
Jurassic
Subduction zone
Geochemistry
Petrogenesis
Geología
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id REPOUCALDA_582ed04f3562a25edfc727494b2688ee
oai_identifier_str oai:repositorio.ucaldas.edu.co:ucaldas/26137
network_acronym_str REPOUCALDA
network_name_str Repositorio Institucional U. Caldas
repository_id_str
dc.title.none.fl_str_mv Caracterización petrográfica y geoquímica del Monzogranito de Mocoa en el sur de los Andes Colombianos e implicaciones para su evolución magmática
title Caracterización petrográfica y geoquímica del Monzogranito de Mocoa en el sur de los Andes Colombianos e implicaciones para su evolución magmática
spellingShingle Caracterización petrográfica y geoquímica del Monzogranito de Mocoa en el sur de los Andes Colombianos e implicaciones para su evolución magmática
550 - Ciencias de la tierra::551 - Geología, hidrología, meteorología
1. Ciencias Naturales
Monzogranito de Mocoa
Jurásico
Zona de subducción
Geoquímica
Petrogénesis
Mocoa Monzogranite
Jurassic
Subduction zone
Geochemistry
Petrogenesis
Geología
title_short Caracterización petrográfica y geoquímica del Monzogranito de Mocoa en el sur de los Andes Colombianos e implicaciones para su evolución magmática
title_full Caracterización petrográfica y geoquímica del Monzogranito de Mocoa en el sur de los Andes Colombianos e implicaciones para su evolución magmática
title_fullStr Caracterización petrográfica y geoquímica del Monzogranito de Mocoa en el sur de los Andes Colombianos e implicaciones para su evolución magmática
title_full_unstemmed Caracterización petrográfica y geoquímica del Monzogranito de Mocoa en el sur de los Andes Colombianos e implicaciones para su evolución magmática
title_sort Caracterización petrográfica y geoquímica del Monzogranito de Mocoa en el sur de los Andes Colombianos e implicaciones para su evolución magmática
dc.contributor.none.fl_str_mv Quiceno Colorado, July Astrid
Hernández-González, Juan S.
Naranjo Sierra, Edwin
Osorio Ocampo, Susana
dc.subject.none.fl_str_mv 550 - Ciencias de la tierra::551 - Geología, hidrología, meteorología
1. Ciencias Naturales
Monzogranito de Mocoa
Jurásico
Zona de subducción
Geoquímica
Petrogénesis
Mocoa Monzogranite
Jurassic
Subduction zone
Geochemistry
Petrogenesis
Geología
topic 550 - Ciencias de la tierra::551 - Geología, hidrología, meteorología
1. Ciencias Naturales
Monzogranito de Mocoa
Jurásico
Zona de subducción
Geoquímica
Petrogénesis
Mocoa Monzogranite
Jurassic
Subduction zone
Geochemistry
Petrogenesis
Geología
description Tablas, figuras
publishDate 2025
dc.date.none.fl_str_mv 2025-11-11T21:40:53Z
2025-11-11T21:40:53Z
2025-11-10
dc.type.none.fl_str_mv Trabajo de grado - Pregrado
http://purl.org/coar/resource_type/c_7a1f
Text
info:eu-repo/semantics/bachelorThesis
dc.identifier.none.fl_str_mv https://repositorio.ucaldas.edu.co/handle/ucaldas/26137
Universidad de Caldas
Repositorio Institucional Universidad de Caldas
repositorio.ucaldas.edu.co
url https://repositorio.ucaldas.edu.co/handle/ucaldas/26137
identifier_str_mv Universidad de Caldas
Repositorio Institucional Universidad de Caldas
repositorio.ucaldas.edu.co
dc.language.none.fl_str_mv spa
language spa
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dc.publisher.none.fl_str_mv Universidad de Caldas
Facultad de Ciencias Exactas y Naturales
Manizales, Caldas
Geología
publisher.none.fl_str_mv Universidad de Caldas
Facultad de Ciencias Exactas y Naturales
Manizales, Caldas
Geología
institution Universidad de Caldas
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spelling Caracterización petrográfica y geoquímica del Monzogranito de Mocoa en el sur de los Andes Colombianos e implicaciones para su evolución magmática550 - Ciencias de la tierra::551 - Geología, hidrología, meteorología1. Ciencias NaturalesMonzogranito de MocoaJurásicoZona de subducciónGeoquímicaPetrogénesisMocoa MonzograniteJurassicSubduction zoneGeochemistryPetrogenesisGeologíaTablas, figurasEl Monzogranito de Mocoa es un batolito de edad Jurásico Temprano a Medio (edades de cristalización U-Pb en circón que abarcan un intervalo entre 181.8 ± 1.3 Ma a 180.4 ± 1.6 Ma), localizado en el sur de los Andes Colombianos. Representa una importante unidad del basamento de la actual Cordillera Central y del Valle Superior del Magdalena. El batolito está emplazado en sucesiones metasedimentarias carbonatadas del Complejo Aleluya y en sucesiones volcanoclásticas de la Formación Saldaña. Petrográficamente el Monzogranito de Mocoa está conformado por tres facies principales: i) una facies máfica, que varía entre gabro-diorita de grano grueso-muy grueso y diorita con anfíbol de grano fino-medio, ii) una facies intermedia, que incluye cuarzodiorita de biotita y anfíbol, así como monzonita con anfíbol, y iii) una facies ácida, que comprende sienogranitos con variaciones a granodiorita, granodiorita con anfibol y granodiorita con biotita y anfíbol. Los análisis químicos de elementos mayores muestran composiciones calcoalcalinas para las tres facies. Los patrones de elementos traza normalizados a condrito muestran enriquecimiento sistemático en tierras raras livianas (LREE), empobrecimiento de tierras raras pesadas (HREE) y anomalías negativas de Eu particularmente marcadas en las facies félsicas. En diagramas multielementales normalizados a manto primitivo se observa enriquecimiento en elementos LILE (Sr, K, Rb, Ba) y empobrecimiento en HFSE (Nb, Ta, Ti, P), lo que evidencia una firma magmática típica de arcos de subducción. Además, se documentan caídas pronunciadas en Nb y Ta, rasgo diagnóstico del magmatismo supra-subducción. De acuerdo con los resultados petrográficos y geoquímicos de las rocas analizadas, la evolución magmática estuvo dominada por procesos de cristalización fraccionada, mostrando una transición entre las facies máficas e intermedias hacia las facies félsicas, y procesos de interacción de magmas (mingling) (recarga magmática) y asimilación magmática. El índice de saturación de alúmina (Metaluminoso a peraluminoso) y la afinidad química de los diferentes litotipos, sugiere una transición y maduración del arco. El Monzogranito de Mocoa se formó en un ambiente tectónico correspondiente a un arco volcánico continental, bajo condiciones de evolución magmática variables entre sus diferentes facies. Las facies máficas e intermedias registran condiciones oxidantes con baja fO₂, un carácter anhidro y una limitada asimilación cortical, desarrollándose en una corteza delgada. Estas características son consistentes con un escenario de slab rollback, asociado a una transición desde una subducción somera de bajo ángulo hacia una subducción más inclinada, lo cual genera relajación y adelgazamiento cortical, favoreciendo el ascenso del manto durante el Jurásico inferior en la base de la corteza del NW de Gondwana. En contraste, las facies félsicas reflejan condiciones igualmente oxidantes, pero con mayor fO₂, en presencia de agua y con un mayor aporte de fluidos y sedimentos derivados de la subducción, junto con una mayor asimilación cortical en una corteza ya engrosada. Este escenario sugiere una disminución del ángulo de subducción, generando un régimen compresivo local en el sur de Colombia y la migración hacia el este de las unidades magmáticas.The Mocoa Monzogranite is a batholith of Early to Middle Jurassic age (U–Pb zircon crystallization ages ranging from 181.8 ± 1.3 Ma to 180.4 ± 1.6 Ma), located in the southern Colombian Andes. It represents a major basement unit of the present-day Central Cordillera and the Upper Magdalena Valley. The batholith is emplaced within carbonate-rich metasedimentary sequences of the Aleluya Complex and volcaniclastic successions of the Saldaña Formation. Petrographically, the Mocoa Monzogranite comprises three main facies: i) a mafic facies, varying from coarse- to very coarse-grained gabbro–diorite to fine- to medium-grained amphibole-bearing diorite; ii) an intermediate facies, including biotite- and amphibole-bearing quartz diorite as well as amphibole monzonite; and iii) an acidic facies, consisting of syenogranites grading to granodiorite, amphibole-bearing granodiorite, and biotite–amphibole granodiorite. Major-element geochemistry indicates calc-alkaline compositions for all three facies. Chondrite-normalized trace element patterns display systematic enrichment in light rare earth elements (LREEs), depletion in heavy rare earth elements (HREEs), and pronounced negative Eu anomalies, particularly in the felsic facies. Primitive mantle–normalized multi-element diagrams reveal enrichment in large ion lithophile elements (LILEs) (Sr, K, Rb, Ba) and depletion in high field strength elements (HFSEs) (Nb, Ta, Ti, P), reflecting a magmatic signature typical of subduction-related arc settings. Strong negative Nb and Ta anomalies further support a supra-subduction magmatic affinity. Petrographic and geochemical evidence indicates that the magmatic evolution was dominated by fractional crystallization processes, showing a transition from mafic–intermediate to felsic facies, along with magma mingling/recharging and assimilation processes. The alumina saturation index (metaluminous to peraluminous) and the chemical affinity of the different lithotypes suggest an evolving and maturing magmatic arc. The Mocoa Monzogranite formed within a continental volcanic arc setting, under variable magmatic conditions across its facies. The mafic and intermediate facies record oxidizing conditions with low fO₂, an anhydrous character, and limited crustal assimilation, consistent with a thin crustal environment. These features are characteristic of a slab rollback scenario, associated with a transition from low-angle (flat) subduction to steeper subduction, producing crustal relaxation and thinning that favored mantle upwelling at the base of the crust in the northwestern margin of Gondwana during the Early Jurassic. In contrast, the felsic facies reflect similarly oxidizing but higher fO₂ conditions, in the presence of water-rich magmas, with a greater contribution of subduction-derived fluids and sediments and enhanced crustal assimilation within a thickened crust. This scenario suggests a decrease in the subduction angle, leading to a local compressive regime in southern Colombia and the eastward migration of magmatic units.Introducción -- Objetivos -- Objetivo general -- Objetivos específicos -- Marco geológico -- Contexto tectónico de la Cordillera Central de los Andes Colombianos -- Monzogranito de Mocoa -- Marco teórico -- Magmatismo en orógenos por subducción -- Magmatismo en arcos continentales -- Magmatismo en arcos de islas -- Mecanismos de emplazamiento -- Propagación por fracturas -- Diapirismo -- Evolución y cristalización de los magmas -- Tipos de cristalización -- Cristalización en equilibrio -- Cristalización fraccionada -- Contaminación cortical -- Mezcla de magmas -- Geoquímica de sistemas magmáticos en zonas de subducción -- Subducción corteza oceánica – corteza continental -- Subducción corteza oceánica – corteza oceánica -- Metodología -- Análisis macroscópico -- Elaboración de secciones delgadas pulidas -- Análisis petrográfico -- Geoquímica de elementos mayores y traza en roca total -- Resultados -- Descripción litológica y análisis macroscópico -- Facies máfica -- Gabro hornbléndico -- Facies intermedia -- Cuarzodiorita con biotita y anfíbol -- Facies félsica -- Granodiorita con biotita -- Cuarzomonzonita con anfíbol -- Enclave de cuarzogabro de anfíbol -- Monzogranito -- Petrografía -- Facies máfica -- Gabro hornbléndico -- Diorita de anfíbol -- Facies intermedia -- Cuarzodiorita con biotita y anfíbol -- Monzonita con anfíbol -- Facies félsica -- Granodiorita -- Enclave gabro hornbléndico -- Monzogranito -- Sienogranito -- Geoquímica -- Clasificación geoquímica y afinidad -- Clasificación de granitos e índice de saturación de alúmina del magma -- Diagramas Harker -- Elementos traza y elementos de tierras raras (REE) -- Discriminación tectónica -- Discusión -- Procesos de cristalización y evidencias petrográficas de desequilibrio -- Mecanismos de evolución magmática: fraccionamiento, recarga y mezcla -- Génesis del magma y controles fisicoquímicos -- Registro del magmatismo Jurásico al sur de los Andes Colombianos e implicaciones tectónicas -- Correlación entre el Monzogranito de Mocoa y otros plutones del Jurásico -- Espesor de la corteza durante el emplazamiento de los magmas -- Escenario tectónico para la génesis y emplazamiento del magma que dio origen al Monzogranito de Mocoa -- Conclusiones -- Recomendaciones -- Referencias -- AnexosPregradoLa metodología aplicada en este trabajo se basa en tres etapas principales correspondientes a una fase de descripción macroscópica de rocas, análisis petrográfico y análisis geoquímicoGeólogo(a)Universidad de CaldasFacultad de Ciencias Exactas y NaturalesManizales, CaldasGeologíaQuiceno Colorado, July AstridHernández-González, Juan S.Naranjo Sierra, EdwinOsorio Ocampo, SusanaSánchez Barragán, María Camila2025-11-11T21:40:53Z2025-11-11T21:40:53Z2025-11-10Trabajo de grado - Pregradohttp://purl.org/coar/resource_type/c_7a1fTextinfo:eu-repo/semantics/bachelorThesis174 páginasapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttps://repositorio.ucaldas.edu.co/handle/ucaldas/26137Universidad de CaldasRepositorio Institucional Universidad de Caldasrepositorio.ucaldas.edu.cospaAmaya, C. 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