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Análisis metalográfico, petrográfico y microtermométrico de la mineralización vetiforme presente en el el proyecto Cordero, Distrito Minero El Bagre, Antioquia-Colombia
dc.contributor.advisor | Naranjo Sierra, Edwin | |
dc.contributor.author | Vivas Coral, Dalis | |
dc.date.accessioned | 2023-09-27T20:11:10Z | |
dc.date.available | 2023-09-27T20:11:10Z | |
dc.date.issued | 2023-09-27 | |
dc.identifier.uri | https://repositorio.ucaldas.edu.co/handle/ucaldas/19616 | |
dc.description | Ilustraciones, mapas, gráficas | spa |
dc.description.abstract | spa:El depósito vetiforme Cordero se encuentra localizado al interior del Distrito Minero El Bagre, al Este del sistema de fallas Otú-Pericos, en la región del Bajo Cauca del departamento de Antioquia, Colombia. La mineralización vetiforme está hospedada en rocas graníticas carboníferas del stock de El Carmen. Tres etapas de mineralización fueron definidas: Etapa I está dominada por cuarzo masivo (Qz1), pirita de grano grueso (Py1), pirita arseniosa (PyA), sericita (Ser1) y cantidades menores de oro libre (Au1). La etapa II, es la principal etapa mineralizante y está caracterizada por cuarzo recristalizado (Qz2) y con textura comb (Qz3), calcopirita (Ccp), galena (Gn), oro (Au2), telururos de oro y plata (Clv, Kre, Syl, Hess), telururos de plomo (Alt), telururos de Hg (Cld), calcita (Cal1), sericita (Ser2), clorita (Chl) y contenidos menores de anatasa (Ant) y pirita finogranular (Py2). La etapa III de mineralización está dominada por venillas de calcita (Cal2) y cuarzo (Qz4). Los análisis químicos permitieron definir las asociaciones de metales Au-Te, Au-Ag, Au-Ag-Te (Bi) y Au-Te-Pb al interior de la veta. Los análisis microtermométricos revelaron la presencia de tres tipos de inclusiones fluidas. Inclusiones fluidas primarias (tipo I) H2O-NaCl±CH4±N2 , reportadas por primera vez para las vetas al interior del Distrito Minero de El Bagre, están atrapadas en cuarzo masivo (Qz1) y están caracterizadas por la presencia de clatratos (CH4 ±N2), salinidades entre 0.57 - 5.23 % wt NaCl equiv y homogenización (a liquido) entre 300 - 363°C. Inclusiones primarias acuo-salinas (tipo IIA) atrapadas en cuarzo reactivado (Qz2) con salinidades entre 1.7 y 7.8% wt NaCl equiv y temperaturas de homogenización entre 145 y 203°C. Inclusiones secundarias acuo salinas (tipo IIB) atrapadas en cuarzo masivo (Qz1) con salinidades entre 0.7 y 8.1 %wt NaCl equiv y homogenización (a líquido) entre 148 y 257°C. Inclusiones primarias acuo-salinas (tipo IIC) atrapadas en calcita masiva (Cal1) con salinidades entre 2.5 y 6.45 %wt NaCl equiv y temperaturas de homogenización entre 147 y 220°C. Inclusiones secundarias acuo-salinas (tipo IID) atrapadas en calcita masiva (Cal1) con salinidades entre 1.7 y 6.1 %wt NaCl equiv y homogenización (a liquido) entre 120 y 127°C. Inclusiones primarias tardías (tipo III) atrapadas en venillas de calcita (Cal2) con bajas salinidades (4.8 %wt NaCl equiv.) y baja temperatura de homogenización (105 a 107°C). Sericita y sericita-clorita son las alteraciones dominantes al interior de la veta. Los fluidos hidrotermales fueron de naturaleza neutra a ligeramente alcalina, como lo indica los ensambles minerales y de condiciones relativamente reducidas de acuerdo a la ausencia de hematita y la coexistencia de pirita-clorita. En consecuencia, el complejo Au(HS)2- fue probablemente el medio de trasporte del oro. El depósito vetiforme de Cordero presenta características similares a los depósitos de oro orogénico. | spa |
dc.description.abstract | eng: Cordero lode type deposit is located within the El Bagre Mining District to the East of the Otú Pericos fault system, in the Bajo Cauca region of Antioquia department, Colombia Lode gold type mineralization is hosted within Carboniferous granite rocks from the El Carmen stock. Three mineralization stages were defined: Stage I is dominated by massive quartz (Qz1), course-grained pyrite (Py1), arsenic-pyrite (PyA), sericite (Ser1) and minor content of free gold (Au1). Stage II is the main mineralization stage and is characterized by recrystallization of massive quartz (Qz2) and comb quartz (Qz3), chalcopyrite (Ccp), galena (Gn), gold (Au2), Au and Ag tellurides (Clv, Kre, Syl and Hess), Pb-tellurides (Alt), Hg-tellurides (Cld), calcite (Cal1), sericite (Ser2), chlorite (Chl) and minor content of anatase (Ant) and fine-grained pyrite (Py2). Late mineralization stage III, is dominated by cross cutting quartz (Qz4) – calcite (Cal2) veins. Geochemical analysis allowed to define Au-Te, Au Ag, Au-Ag-Te (Bi) and Au-Te-Pb as the main metals associations within the vein. Microthermometric analysis revealed the presence of three types of fluid inclusions. Primary H2O-NaCl±CH4±N2 fluid inclusion (type I,) reported for the first time for lode gold type mineralization within the El Bagre Mining District, trapped in massive quartz (Qz1), and characterized by the presence of clathrates (CH4 ±N2), salinities between 0.57 and 5.23 % wt NaCl equiv. and homogenization (to liquid) between 300 and 363°C. Primary aqueous-saline (type IIA) inclusions trapped in reactivated quartz (Qz2) with salinities ranging between 1.7 and 7.8% wt NaCl equiv. and homogenization (to liquid) between 145 and 203°C. Cross-graining secondary aqueous saline (type IIB) inclusions trapped in massive quartz (Qz1) with salinities between 0.7 and 8.1 %wt NaCl equiv. and homogenization (to liquid) between 148 and 257°C. Primary aqueous-saline (type IIC) inclusions trapped in massive calcite (Cal1) with salinities between 2.5 and 6.45 %wt NaCl equiv. and homogenization temperatures (to liquid) ranging between 147 and 220°C. Cross-graining secondary aqueous-saline (type IID) inclusions trapped in massive calcite (Cal1) with salinities between 1.7 and 6.1 %wt NaCl equiv. and homogenization (to liquid) between 120 and 127°C. Late cross-graining primary fluid inclusion trapped in calcite veins (Cal2) with low salinities (4.8 %wt NaCl equiv.) and low homogenization temperatures (105 to 107°C). Sericite and sericite-chlorite are the main hydrothermal alteration within the vein. The ore-forming fluid were neutral to slightly alkaline, as indicated by the mineral assemblages and relatively reduced according to absence of hematite and the coexistence of pyrite and chlorite. In consequence, Au (HS)2- was likely the gold transporting complex. Cordero lode gold type deposits share similar characteristics with orogenic gold deposits. | eng |
dc.description.tableofcontents | 1. Introducción / 2. Antecedentes / 3. Justificación / 4. Objetivos / 4.1 General / 4.2 Específicos / 5. Metodología / 5.1 Etapa de Campo / 5.2 Petrografía y Metalografía / 5.3 Litogeoquímica / 5.4 Geoquímica Multielemental / 5.5 Microtermometría / 5.6 Espectroscopía Raman / 6. Marco Geológico / 7. Geología Local / 8. Mineralización / 9. Alteraciones Hidrotermales / 9.1 Petrografía / 9.2 Litogeoquímica de Alteración Hidrotermal / 10. Texturas de Cuarzo y Texturas de Mena / 10.1 Texturas de Cuarzo / 10.2 Texturas de Mena / 11. Secuencia Paragenética / 12. Caracterización y Ocurrencia del Oro / 12.1 Tamaño y Morfología / 12.2 Ocurrencia / 13. Geoquímica Multielemental / 14. Inclusiones Fluidas / 14.1 Petrografía de las Inclusiones Fluidas / 14.2 Microtermometría de las Inclusiones Fluidas / 15. Discusión / 15.1 Naturaleza y Evolución del Fluido Hidrotermal / 15.2 Transporte y Depositación del Oro / 15.3 Modelo Genético para el depósito / 16. Conclusiones / 17. Referencias | eng |
dc.format.mimetype | application/pdf | spa |
dc.language.iso | eng | spa |
dc.language.iso | spa | spa |
dc.title | Análisis metalográfico, petrográfico y microtermométrico de la mineralización vetiforme presente en el el proyecto Cordero, Distrito Minero El Bagre, Antioquia-Colombia | spa |
dc.type | Trabajo de grado - Pregrado | spa |
dc.description.degreelevel | Universitario | spa |
dc.identifier.instname | Universidad de Caldas | spa |
dc.identifier.reponame | Repositorio Institucional Universidad de Caldas | spa |
dc.identifier.repourl | https://repositorio.ucaldas.edu.co/ | spa |
dc.publisher.faculty | Facultad de Ciencias Exactas y Naturales | spa |
dc.publisher.place | Manizales | spa |
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dc.rights.accessrights | info:eu-repo/semantics/closedAccess | spa |
dc.rights.accessrights | info:eu-repo/semantics/closedAccess | spa |
dc.rights.accessrights | info:eu-repo/semantics/closedAccess | spa |
dc.rights.accessrights | info:eu-repo/semantics/closedAccess | spa |
dc.subject.proposal | Metalografía | spa |
dc.subject.proposal | Distrito Minero El Bagre | spa |
dc.subject.proposal | Proyecto Cordero | spa |
dc.subject.proposal | Microtermometría | spa |
dc.subject.proposal | Petrografía | spa |
dc.subject.proposal | Inclusiones fluidas | spa |
dc.subject.unesco | Ciencias de la tierra | |
dc.type.coar | http://purl.org/coar/resource_type/c_7a1f | spa |
dc.type.content | Text | spa |
dc.type.driver | info:eu-repo/semantics/bachelorThesis | spa |
dc.type.version | info:eu-repo/semantics/publishedVersion | spa |
oaire.version | http://purl.org/coar/version/c_ab4af688f83e57aa | spa |
oaire.accessrights | http://purl.org/coar/access_right/c_14cb | spa |
dc.description.degreename | Geólogo(a) | spa |
dc.publisher.program | Geología | spa |
dc.description.researchgroup | Yacimientos Minerales | spa |
dc.rights.coar | http://purl.org/coar/access_right/c_14cb | spa |
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