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THE PAIPA VOLCANO, EASTERN CORDILLERA OF COLOMBIA , SOUTH AMERICA (PART II): PETROGRAPHY AND MAJOR ELEMENTS PETROLOGY

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      Abstract

      Paipa volcano products are mainly pyroclastic pumice and ash flow tuffs, lava domes and pyroclastic block and ash flow tuffs. They are classified as alkaline rhyolites and trachytes and high-K calcalkaline rhyolites . Chemical data show SiO2 values between 68 and 72%, and alkalis (Na2O+K2O) content of 7%-10%. Essential minerals are phenocrysts and glomerocrysts of anorthoclase , sanidine up to 1 ,5 cm and anorthoclase -mantled plagioclase; accessory minerals are red biotite , and hastingsite while trace minerals are augite , zircon, sphene and magnetite. Crystals have disequilibrium textures, such as dissolution embayments , corrosion and reabsortion borders, normal, inverse, oscillating and patchy zonation , together with fibrous borders intercalated with euhedral borders. In correlation with published data of Iza volcanic rocks, Paipa rocks chemical composition confirms that acid and alkaline magmas that have erupted in the Eastern Cordillera of Colombia during the Neogene are strongly different from the calc-alkaline magmas that erupt in the westward active arc (Central Cordillera). Detailed structural, geochemical and geophysical research has to be done in future research to establish the geodynamic framework that governs the volcanism of the Eastern Cordillera .

      Translated abstract

      Los productos del volcán de Paipa (Pardo et al., 2005) son principalmente depósitos de flujos piroclásticos de pómez y ceniza, domos y flujos pirolásticos de bloques y ceniza. Se trata de riolitas alcalinas, traquitas alcalinas y riolitas calcoalcalinas altas en Potasio. Los datos químicos evidencian contenidos de SiO2 entre 68 y 72%, y de álcalis ( Na2O +K2O) entre 7%-10%. Los minerales esenciales son fenocristales y glomerocristales de anortoclasa , sanidina hasta de 1,5 cm y anortoclasas con núcleos de plagiocalasa ; los minerales accesorios son biotita roja y hastingsita , mientras que los traza son augita, circón, esfena y magnetita. Los cristales presentan texturas de desequilibrio, tal como bahías de disolución, bordes de corrosión y reabsorción, zonación normal, inversa, oscilatoria y en parches, así como bordes euhedrales intercalados con bordes fibrosos. En correlación con datos publicados sobre las rocas volcánicas de Iza, la geoquímica de elementos mayors de las rocas volcánicas de Paipa indican que los magmas alcalinos y ácidos que hicieron erupción en la Cordillera Oriental de Colombia durante el Neógeno son distintos a los magmas calcoalcalinos que hacen actualmente erupción en el arco activo de la Cordillera Central de Colombia. Aún hacen falta estudios detallados de la geología structural , geoquímica y geofísica para establecer el ambiente geodinámico que gobierna el vulcanismo Plio -Pleistoceno en la Cordillera Oriental .

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      Most cited references 8

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      A Classification of Igneous Rocks and Glossary of Terms: Recommendations of the International Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks

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        Estratigrafía de las vulcanitas asociadas al volcán de Paipa, municipios de Paipa y Tuta, Departamento de Boyacá, Colombia

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          Classification and nomenclature of volcanic rocks, lamprophyres, carbonatites and melilitic rocks: recommendations and suggestions, IUGS Subcommission on the Systematics of Igneous Rocks

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            Author and article information

            Affiliations
            [1] Universidad Nacional de Colombia Colombia
            [2] Latin America Enterprise Fund Managers L.L.C
            [3] Geological Survey of Colombia Colombia
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Journal
            esrj
            Earth Sciences Research Journal
            Earth Sci. Res. J.
            Universidad Nacional de Colombia (Bogotá)
            1794-6190
            December 2005
            : 9
            : 2
            : 148-164
            S1794-61902005000200008

            http://creativecommons.org/licenses/by/4.0/

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            Product Information: SciELO Colombia
            Categories
            GEOSCIENCES, MULTIDISCIPLINARY
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