Artículos
Petrogénesis y condiciones de cristalización del domo intracratérico del volcán Cerro Bravo, Colombia
Camilo Pinzón- Juan Felipe Echeverri
- Hugo Murcia
- Dayana Schonwalder-Ángel
Publicado 2018-09-25
Palabras clave
- Anfíbol,
- geotermobarometría,
- cámaras magmática,
- evolución magmática,
- volcán poligenético
Cómo citar
Pinzón, C., Echeverri, J. F., Murcia, H., & Schonwalder-Ángel, D. (2018). Petrogénesis y condiciones de cristalización del domo intracratérico del volcán Cerro Bravo, Colombia. Boletín De Geología, 40(3), 67–84. https://doi.org/10.18273/revbol.v40n3-2018004
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Resumen
El volcán Cerro Bravo (VCB) es un volcán compuesto ubicado en la Cordillera Central de Colombia. Durante los 50 ka de evolución del volcán la actividad eruptiva ha variado entre erupciones plinianas y emisiones efusivas. Actualmente, el cráter se encuentra ocupado por un domo que representa la última fase eruptiva de la erupción más reciente. El domo presenta una mineralogía típica de rocas andesíticas-dacíticas, con cristales de plagioclasa, anfíbol
y piroxeno. La composición del anfíbol evidencia condiciones de cristalización entre 1 y 3,5 kba, de 800 a 950°C, de -5,3 a -6,8 fO2, y de 5,1 a 6,8 H2O wt.% en el fundido, mientras que en el piroxeno evidencia condiciones de 914 ±97°C y 18,5 ±9,2 Kba. Con base en estos resultados y en las relaciones mineralógicas, se puede establecer una historia de cristalización de la siguiente manera: Augita y enstatita fueron los primeros minerales en cristalizar (>20 – 30 km). Posteriormente hubo un ascenso hacia una cámara magmática ubicada entre 4,6 y 13,2 km donde comenzó la cristalización del anfíbol (a la base de la cámara cristalizó pargasita, y al techo edenita y magnesihornblenda). La disminución en la temperatura, presión y el contenido de calcio durante el ascenso del magma favorecieron la cristalización de labradorita, la cual fue variando hasta andesina. Los microlitos que hacen parte de la masa fundamental son evidencia de las últimas fases de cristalización producto de la descompresión magmática. Este estudio muestra las condiciones de cristalización que representan la última fase eruptiva de la erupción más reciente del VCB.
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Referencias
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Bourdon, E., Eissen, J., Gutscher, M., Monzier, M., Hall, M., and Cotten, J. (2003). Magmatic response to early aseismic ridge subduction: the Ecuadorian margin case (South America). Earth and Planetary Science Letters, 205(3-4), 123-138. doi: 10.1016/S0012-821X(02)01024-5.
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Cashman, K. (1993). Relationship between plagioclase crystallization and cooling rate in basaltic melts. Contributions to Mineralogy and Petrology, 113(1), 126-142. doi: 10.1007/BF00320836. CHEC. (1983). Investigación geotérmica Macizo Volcánico del Ruiz. Informe Final. Central Hidroeléctrica de Caldas.
Cortés, J. (2015). CFU-PINGU. Consultado el 15 de junio de 2017. https://vhub.org/resources/cfupingu.2015.
Eggler, D. (1972). Amphibole stability in H2O –undersaturated calc-alkaline melts. Earth and Planetary Science Letters, 15(1), 28-34. doi:10.1016/0012-821X(72)90025-8.
Eggler, D., and Burnham, C. (1973). Crystallization and fractionation trends in the system andesite-H2O-CO2-O2 at pressures to 10 Kb. Geological Society of America Bulletin, 84, 2517-2532.
Ginibre, C., and Wörner, G. (2007). Variable parent magmas and recharge regimes of the Parinacota magma system (N. Chile) revealed by Fe, Mg and Sr zoning in plagioclase. Lithos, 98(1-4), 118-140. doi: 10.1016/j.lithos.2007.03.004.
González, L., y Jaramillo, C. (2002). Estudio neotectónico multidisciplinario aplicado a la falla Villamaría-Termales. Tesis, Departamento de Ciencias Geológicas, Universidad de Caldas, Manizales, Colombia.
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Janoušek, V., Farrow, C., and Erban, V. (2006). Interpretation of whole-rock geochemical data in igneous geochemistry: introducing Geochemical Data Toolkit (GCDkit). Journal of Petrology, 47(6), 1255-1259. doi: 10.1093/petrology/egl013.
Jordan, T., Isacks, B., Allmendinger, R., Brewer, J., Ramos, V., and Ando, C. (1983). Andean tectonics related to geometry of subducted Nazca plate. GSA Bulletin, 94, 341-361.
Laeger, K., Halama, R., Hansteen, T., Savov, I.P., Murcia, H.F., Cortés, G.P., and Garbe-Schönberg, D. (2013). Crystallization conditions and petrogenesis of the lava dome from the ∼900 years BP eruption of Cerro Machín Volcano, Colombia. Journal of South American Earth Sciences, 48, 193-208. doi: 10.1016/j.jsames.2013.09.009.
Leake, B., Woolley, A., Arps, C., Birch, W., Gilbert, M., Grice, J., Hawthorne, E., Kato, A., Kisch, H.J., Krivovichev, V.G., Linthout, K., Laird, J., Mandarino, J., Maresch, W.V., Nickel, E.H., Rock, N.M.S., Schumacher, J.C., Smith, D.C., Stephenson, N.C.N., Ungaretti, L., Whittaker, E.J.W., and Youzhi, G. (1997). Nomenclature of amphiboles: Report of the Subcommittee on Amphiboles of the International Mineralogical Association Commission on New Minerals and Mineral Names. European Journal of
Mineralogy, 9(3), 623-651. doi: 10.1127/ejm/9/3/0623.
Lescinsky, D. (1990). Geology, volcanology and petrology of Cerro Bravo, a young dacitic stratovolcano in west–central Colombia. MSc Thesis, Lousiana State University, Baton Rouge, USA.
Londoño, J. (2016). Evidence of recent deep magmatic activity at Cerro Bravo-Cerro Machín volcanic complex, central Colombia. Implications for future volcanic activity at Nevado del Ruiz, Cerro Machín and other volcanoes. Journal of Volcanology and Geothermal Research, 324, 156-168. doi: 10.1016/j.jvolgeores.2016.06.003.
Maksimov, A. (2009). The influence of water on the temperature of amphibole stability in melts. Journal of Volcanology and Seismology, 3(1), 27-33. doi: 10.1134/S0742046309010035.
Martel, C., Pichavant, M., Holtz, F., Scaillet, B., Bourdier, J., and Traineau, H. (1999). Effects of fO2 and H2O on andesite phase relations between 2 and 4 kbar. Journal
of Geophysical Research: Solid Earth, 104(B12), 29453-29470. doi: 10.1029/1999JB900191.
Martínez, T., Valencia, R., Ceballos, H., Narváez, M., Pulgarín, A., Correa, T., Navarro, A., Murcia, A., Zuluaga, M., Rueda, G., y Pardo, V. (2014). Geología y estratigrafía del Complejo Volcánico Nevado del Ruiz. Informe final, Bogotá – Manizales – Popayán. Servicio Geológico Colombiano.
Mejía, E., Velandia, F., Zuluaga, C., López, J., y Cramer, T. (2012). Análisis estructural al noreste del volcán Nevado del Ruíz, Colombia - Aporte a la exploración geotérmica. Boletín de Geología, 34(1), 27-41.
Monsalve, M.L. (1991). Mapa preliminar de amenaza volcánica del volcán Cerro Bravo. INGEOMINAS. Manizales.
Monsalve, M.L., y Nuñez, A. (1992). El volcán Cerro Bravo, geología y amenaza volcánica. Revista INGEOMINAS, 1, 2-9. Morimoto, N. (1989). Nomenclature of pyroxenes.
Mineralogical Journal, 14(5), 198-221. doi: 10.2465/minerj.14.198.
Murcia, H., Borrero, C., and Németh, K. (in press). Overview and plumbing system implications of the monogenetic volcanism in the northernmost Andes’ volcanic province. Journal of Volcanology and Geothermal Research. doi: 10.1016/j.jvolgeores.2018.06.013.
O’Neill, H., and Pownceby, M. (1993). Thermodynamic data from redox reactions at high temperatures. I. An experimental and theoretical assessment of the electrochemical method using stabilized zirconia electrolytes, with revised values for the Fe-“FeO”, Co-CoO, Ni-NiO and Cu-Cu2O oxygen buffers,and new data for the W-WO2 buffer. Contributions to Mineralogy and Petrology, 114(3), 296-314. doi: 10.1007/BF01046533.
Putirka, K.D. (2008). Thermometers and barometers for volcanic systems. Reviews in Mineralogy and Geochemistry, 69(1), 61-120.
Rahman, S., and MacKenzie, W. (1969). The crystallization of ternary feldspars: a study from natural rocks. American Journal of Science, 267, 391-406.
Rayo-Rocha, L. (2012). Evolución geoquímica y térmica del volcán Nevado del Ruiz, Colombia. Tesis de Magister, Universidad Nacional de Colombia, Bogotá, Colombia.
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