Articles
Petrogenesis and crystallisation conditions of the intra-crater dome of Cerro Bravo volcano, Colombia
Camilo Pinzón- Juan Felipe Echeverri
- Hugo Murcia
- Dayana Schonwalder-Ángel
Published 2018-09-25
Keywords
- Amphibole,
- geothermobarometry,
- magma chamber,
- magmatic evolution,
- polygenetic volcano
How to Cite
Pinzón, C., Echeverri, J. F., Murcia, H., & Schonwalder-Ángel, D. (2018). Petrogenesis and crystallisation conditions of the intra-crater dome of Cerro Bravo volcano, Colombia. Boletín De Geología, 40(3), 67–84. https://doi.org/10.18273/revbol.v40n3-2018004
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Abstract
Cerro Bravo is a composite volcano located in the Central Cordillera of Colombia. Throughout its 50 ka of evolution, this volcano has been characterised by having successive explosive to effusive phases. At present, the crater hosts a dome that represents the last eruptive phase of the last eruption. The dome has a typical mineralogy of andesite-dacite rocks with plagioclase, amphibole and pyroxene crystals. The amphibole composition allow us to constrain the melt
crystallisation conditions at 1 to 3.5 kba, 800 to 950°C, -5.3 to -6.8 fO2, and 5.1 to 6.8 H2O wt.%, while the piroxene composition at 914 ±97°C y 18,5 ±9,2 Kba. Based on these results and the mineralogical configuration, it is possible to establish a crystallisation history as follows: Augite and enstatite were the first formed minerals (>20 – 30 km). After that, the magma ascended up to a magma chamber located between 4.6 and 13.2 km from the surface where
the amphibole crystallisation started (pargasite at the base of the chamber and edenite and magnesiohornblende at the top). The drop in temperature and pressure also promoted the crystallisation of labradorite that transitionally changed to andesine. Plagioclase microlites in the groundmass are evidence of the last crystallisation phase close the surface, as a result of magmatic decompression. This study shows the crystalisation conditions that represent the last
eruptive phase of the last eruption of the Cerro Bravo volcano.
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References
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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.
Rayo-Rocha, L., y Zuluaga, C. (2011). Procesos magmáticos en el volcán Nevado del Ruiz: Un análisis cuantitativo textural. Boletín de Geología, 33(2), 59-72.
Ridolfi, F., Renzulli, A., and Puerini, M. (2010). Stability and chemical equilibrium of amphibole in calc-alkaline magmas: an overview, new thermobarometric formulations and application to subduction-related volcanoes. Contributions to Mineralogy and Petrology, 160(1), 45-66. doi: 10.1007/s00410-009-0465-7.
Rutherford, M., and Devine, J. (1988). The May 18, 1980, eruption of Mount St. Helens, 3, Stability and chemistry of amphibole in the magma chamber. Journal of Geophysical Research: Solid Earth, 93(B10), 11949-11959. doi: 10.1029/JB093iB10p11949.
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