Caracterización petrográfica, metalográfica, litogeoquímica y microtermométrica del Stock de Guarco, municipio de Buriticá, Antioquia, Colombia

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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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https://repositorio.ucaldas.edu.co/handle/ucaldas/26134
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550 - Ciencias de la tierra::551 - Geología, hidrología, meteorología
1. Ciencias Naturales
Stock de Guarco
Sistema pórfido
Alteración hidrotermal
Inclusiones fluidas
Mineralización
Petrografía
Metalografía
Litogeoquímica
Microtermometría
Cinturón Metalogénico del Cauca Medio
Buriticá
Antioquia
Fases intrusivas
Geología
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id REPOUCALDA_343a7e81ae7ce618de095e652ec8a681
oai_identifier_str oai:repositorio.ucaldas.edu.co:ucaldas/26134
network_acronym_str REPOUCALDA
network_name_str Repositorio Institucional U. Caldas
repository_id_str
dc.title.none.fl_str_mv Caracterización petrográfica, metalográfica, litogeoquímica y microtermométrica del Stock de Guarco, municipio de Buriticá, Antioquia, Colombia
title Caracterización petrográfica, metalográfica, litogeoquímica y microtermométrica del Stock de Guarco, municipio de Buriticá, Antioquia, Colombia
spellingShingle Caracterización petrográfica, metalográfica, litogeoquímica y microtermométrica del Stock de Guarco, municipio de Buriticá, Antioquia, Colombia
550 - Ciencias de la tierra::551 - Geología, hidrología, meteorología
1. Ciencias Naturales
Stock de Guarco
Sistema pórfido
Alteración hidrotermal
Inclusiones fluidas
Mineralización
Petrografía
Metalografía
Litogeoquímica
Microtermometría
Cinturón Metalogénico del Cauca Medio
Buriticá
Antioquia
Fases intrusivas
Geología
title_short Caracterización petrográfica, metalográfica, litogeoquímica y microtermométrica del Stock de Guarco, municipio de Buriticá, Antioquia, Colombia
title_full Caracterización petrográfica, metalográfica, litogeoquímica y microtermométrica del Stock de Guarco, municipio de Buriticá, Antioquia, Colombia
title_fullStr Caracterización petrográfica, metalográfica, litogeoquímica y microtermométrica del Stock de Guarco, municipio de Buriticá, Antioquia, Colombia
title_full_unstemmed Caracterización petrográfica, metalográfica, litogeoquímica y microtermométrica del Stock de Guarco, municipio de Buriticá, Antioquia, Colombia
title_sort Caracterización petrográfica, metalográfica, litogeoquímica y microtermométrica del Stock de Guarco, municipio de Buriticá, Antioquia, Colombia
dc.contributor.none.fl_str_mv Quiceno Colorado, July Astrid
Hernández-González, Juan S.
Alvarán, Mauricio
dc.subject.none.fl_str_mv 550 - Ciencias de la tierra::551 - Geología, hidrología, meteorología
1. Ciencias Naturales
Stock de Guarco
Sistema pórfido
Alteración hidrotermal
Inclusiones fluidas
Mineralización
Petrografía
Metalografía
Litogeoquímica
Microtermometría
Cinturón Metalogénico del Cauca Medio
Buriticá
Antioquia
Fases intrusivas
Geología
topic 550 - Ciencias de la tierra::551 - Geología, hidrología, meteorología
1. Ciencias Naturales
Stock de Guarco
Sistema pórfido
Alteración hidrotermal
Inclusiones fluidas
Mineralización
Petrografía
Metalografía
Litogeoquímica
Microtermometría
Cinturón Metalogénico del Cauca Medio
Buriticá
Antioquia
Fases intrusivas
Geología
description Tablas, figuras, formatos
publishDate 2025
dc.date.none.fl_str_mv 2025-11-10T22:28:58Z
2025-11-10T22:28:58Z
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/26134
Universidad de Caldas
Repositorio Institucional Universidad de Caldas
repositorio.ucaldas.edu.co
url https://repositorio.ucaldas.edu.co/handle/ucaldas/26134
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, metalográfica, litogeoquímica y microtermométrica del Stock de Guarco, municipio de Buriticá, Antioquia, Colombia550 - Ciencias de la tierra::551 - Geología, hidrología, meteorología1. Ciencias NaturalesStock de GuarcoSistema pórfidoAlteración hidrotermalInclusiones fluidasMineralizaciónPetrografíaMetalografíaLitogeoquímicaMicrotermometríaCinturón Metalogénico del Cauca MedioBuriticáAntioquiaFases intrusivasGeologíaTablas, figuras, formatosEl Stock de Guarco se localiza en la sección nororiental de la Cordillera Occidental de Colombia, al occidente del municipio de Buriticá (Antioquia). Se encuentra intruyendo a la Formación Barroso y está emplazado entre las fallas Mistrató-Guasabara y Tonusco, al occidente del sistema de fallas Cauca-Romeral. El análisis de núcleos de perforación, complementado con análisis petrográficos y metalográficos, permitió reconocer cuatro fases intrusivas acompañadas de distintos eventos de brechamiento: 1) fase temprana de microcuarzodiorita de anfibol con piroxeno, con variaciones a microdiorita, 2) fase intermineral 1 de gabro, 3) fase intermineral 2 de microtonalita de anfíbol, con variaciones a microgranodiorita, y 4) fase tardía de cuarzodiorita de clinopiroxeno. La mineralización del Stock de Guarco se presenta en forma de vetillas, stockwork, brechas hidrotermales, agregados y diseminaciones, definiendo una secuencia paragenética que incluye cuatro etapas de mineralización vinculadas a las fases intrusivas. La etapa temprana se caracterizó por vetillas típicas de alta temperatura (tipos A1, EB, EB-A, M, A2), asociadas con alteración potásica rica en biotita. Las etapas interminerales mostraron vetillas de temperaturas altas a intermedias, y evidencian la sobreimposición de alteración propilítica en el sistema. Finalmente, la etapa tardía correspondió a un evento de alteración sericítica y clorita-sericita que afectó y sobreimprimió las anteriores etapas, asociado con vetillas típicas de temperatura relativamente baja (tipos B, D, E1, E2). El análisis microtermométrico de inclusiones fluidas, complementado con espectroscopía Raman, sugiere la evolución de un fluido de composición H₂O-NaCl-CaCl₂ ± N₂, con una amplia variación en salinidad (>22.17-67.01 wt. % NaCleq) y temperaturas de homogenización (>243.4- 550 °C) durante la etapa temprana de mineralización, atribuida a procesos de exsolución, inmiscibilidad, ebullición, enfriamiento, mezcla de fluidos. Posteriormente, se registró un evento de mineralización tardío asociado a un fluido de menor temperatura (126.9-183.2 °C) y salinidad (4.87-31.18 wt. % NaCleq), relacionado con la mezcla con aguas meteóricas. Con base en la mineralogía, se interpretó que los fluidos tempranos provinieron de magmas oxidados e hidratados, donde el transporte metálico estuvo dominado por complejos clorurados, mientras que, en la etapa tardía, bajo condiciones más reducidas, fue controlado por complejos sulfurados. En conjunto, el estudio del Stock de Guarco permitió proponer un modelo genético que lo ubica dentro de los sistemas pórfido, revelando una evolución magmática e hidrotermal comparable con la observada en depósitos del cinturón metalogénico del Cauca Medio (p. ej., Andesita de Buriticá, Pórfido La Colosa). Este trabajo proporciona bases para futuras investigaciones, y elementos de interpretación sobre la metalogenia regional.The Guarco Stock is located in the northeastern section of the Western Cordillera of Colombia, west of the municipality of Buriticá (Antioquia). It intrudes the Barroso Formation and is emplaced between the Mistrató–Guasabara and Tonusco faults, west of the Cauca–Romeral fault system. Analysis of drill cores, complemented by petrographic and metallographic studies, allowed the identification of four intrusive phases accompanied by different brecciation events: (1) an early amphibole–pyroxene microquartz diorite phase, grading to microdiorite; (2) an intermineral phase 1 of gabbro; (3) an intermineral phase 2 of amphibole microtonalite, grading to microgranodiorite; and (4) a late clinopyroxene quartz diorite phase. Mineralization in the Guarco Stock occurs as veinlets, stockwork, hydrothermal breccias, aggregates, and disseminations, defining a paragenetic sequence that includes four mineralization stages related to the intrusive phases. The early stage is characterized by typical high-temperature veinlets (types A1, EB, EB-A, M, A2) associated with biotite-rich potassic alteration. The intermineral stages display veinlets of high to intermediate temperatures and show evidence of superimposed propylitic alteration in the system. Finally, the late stage corresponds to a sericitic and chlorite–sericite alteration event that affected and overprinted the previous stages, associated with relatively low-temperature veinlets (types B, D, E1, E2). Microthermometric analysis of fluid inclusions, complemented by Raman spectroscopy, suggests the evolution of an H₂O–NaCl–CaCl₂ ± N₂ fluid, with a wide range of salinities (>22.17– 67.01 wt.% NaCl eq.) and homogenization temperatures (>243.4–550 °C) during the early mineralization stage. These variations are attributed to processes of exsolution, immiscibility, boiling, cooling, and fluid mixing. Subsequently, a late mineralization event was recorded, associated with a lower-temperature (126.9–183.2 °C) and lower-salinity (4.87–31.18 wt.% NaCl eq.) fluid, related to mixing with meteoric waters. Based on the mineralogy, early fluids are interpreted to have derived from oxidized and hydrated magmas, where metal transport was dominated by chloride complexes, whereas in the late stage, under more reduced conditions, transport was controlled by sulfide complexes. Overall, the study of the Guarco Stock supports a genetic model that classifies it within porphyry-type systems, revealing magmatic and hydrothermal evolution comparable to that observed in deposits of the Middle Cauca metallogenic belt (e.g., Buriticá Andesite, La Colosa Porphyry). This work provides a foundation for future research and contributes to the understanding of the regional metallogeny. Keywords: Guarco Stock, porphyry system, hydrothermal alteration, fluid inclusions, mineralization, intrusive phases, petrography, metallography, lithogeochemistry, microthermometry, Cauca Middle Metallogenic Belt, Buriticá, Antioquia.Introducción -- Objetivos -- Objetivo general -- Objetivos específicos -- Marco Geológico -- Marco Teórico -- Depósitos Magmáticos Hidrotermales -- Orógenos por Subducción -- Sistemas de Pórfido, Epitermales y Skarn -- Mecanismos de Emplazamiento -- Diapiros -- Intrusiones Laminares (Diques) -- Alteraciones Hidrotermales -- Controles en la Mineralización y Alteración Hidrotermal -- Estilos de Alteración -- Tipos de Alteración Hidrotermal -- Litogeoquímica -- Inclusiones Fluidas -- Clasificación de Inclusiones Fluidas -- Métodos para el Estudio de Inclusiones Fluidas -- Información proporcionada a partir de las inclusiones fluidas -- Metodología -- Fase Preliminar -- Fase de Campo -- Análisis Petrográfico y Metalográfico -- Caracterización de Vetillas y Texturas del Cuarzo -- Litogeoquímica de la Alteración Hidrotermal -- Análisis de Inclusiones Fluidas -- Petrografía de Inclusiones Fluidas -- Espectroscopía Raman de Inclusiones Fluidas -- Microtermometría de Inclusiones Fluidas -- Resultados -- Descripción Litológica mediante Fotografías de Núcleos de Perforación -- Descripción Macroscópica de Núcleos de Perforación -- Basalto -- Andesita -- Lodolita -- Microdiorita 1 (temprana) -- Microdiorita 2 (intermineral 1) -- Microdiorita 3 (intermineral 2) -- Microdiorita 4 (tardía) -- Brecha intrusiva -- Brecha hidrotermal -- Análisis Petrográfico -- Stock de Guarco etapa temprana -- Stock de Guarco etapa intermineral 1 -- Stock de Guarco etapa intermineral 2 -- Stock de Guarco etapa tardía -- Veta -- Análisis Metalográfico -- Clasificación descriptiva y genética -- Alteración Hidrotermal -- Petrografía -- Litogeoquímica de la alteración hidrotermal -- Caracterización de Vetillas -- Vetillas Tempranas -- Vetillas Transicionales -- Vetillas Tardías -- Texturas del Cuarzo -- Texturas Primarias -- Texturas Secundarias -- Secuencia Paragenética -- Análisis de Inclusiones Fluidas -- Petrografía de Inclusiones Fluidas -- Microtermometría en Inclusiones Fluidas -- Discusión e Interpretación de Resultados -- Implicaciones Petrográficas -- Condiciones Fisicoquímicas y Distribución de la Alteración Hidrotermal -- Naturaleza y Evolución del Fluido Hidrotermal -- Fertilidad del Magma y Modelo Genético -- Conclusiones -- Recomendaciones -- Referencias -- AnexosPregradoCon el fin de cumplir los objetivos propuestos y dar respuesta a la pregunta de investigación, se desarrolló la siguiente metodología subdividida en 6 fases o etapas, correspondientes a una fase preliminar, fase de campo, análisis petrográfico y metalográfico, análisis litogeoquímico y análisis de inclusiones fluidas.Proyecto código No. 2024-073Geólogo(a)Universidad de CaldasFacultad de Ciencias Exactas y NaturalesManizales, CaldasGeologíaQuiceno Colorado, July AstridHernández-González, Juan S.Alvarán, MauricioMartínez Córdoba, William Santiago2025-11-10T22:28:58Z2025-11-10T22:28:58Z2025-11-10Trabajo de grado - Pregradohttp://purl.org/coar/resource_type/c_7a1fTextinfo:eu-repo/semantics/bachelorThesis253 páginasapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttps://repositorio.ucaldas.edu.co/handle/ucaldas/26134Universidad de CaldasRepositorio Institucional Universidad de Caldasrepositorio.ucaldas.edu.cospaAdobe Inc. 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