Examinando por Materia "VULCANISMO"

Mostrando 1 - 14 de 14
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    Aeromagnetic Modelling of the Sudbury Structurre : Precense of a Central Uplift?
    (Universidad EAFIT, 2024) Guardo Cardona, Sebastián; Ugalde, Hernán; Mitacs
    The Sudbury Structure (SS) is an impact crater in Northern Ontario (Canada), known for its significant concentrations of sulfide ores and the complexity of its structural setting. Even after decades of research and exploration, essential questions about its basin structural arrangement remain unresolved. One of these unsolved problems is the existence of the impact crater’s central uplift, a structure that, if recognized, might improve the understanding of the Sudbury Structure's geological history and its mineral deposit arrangement. Here, we evaluated whether the SS’s South Range could house the Structure’s central uplift. A 3D model of the SS's South Range's central zone using magnetic and structural data is presented here to evaluate the presence of the central uplift within this area. We identified a dome-shaped structure on the model's lower noritic surface, accompanied by a horizontalizing behavior on the model's upper overlaying surfaces. By comparing the observed modeled structural disposition with a conceptual model representing a present central uplift scenario, we propose the presence of this structure in the SS’s South Range's central zone. This consideration might help to clarify Sudbury Structure subsurface rocks disposition relating some of its main magnetic and structural characteristics to the final modeled surfaces' magnetic values and geometrical tendencies.
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    Análisis estructural y tectonoestratigráfico de la línea sísmica SPAN-3800 entre las cuencas de Colombia y Guajira Offshore en la región del Caribe colombiano
    (Universidad EAFIT, 2021) Cepeda Posada, Juan Pablo; Redondo Toro, Laura; Beltrán Triviño, Alejandro Iván; Piraquive Bermúdez, Alejandro
    The Guajira Offshore and Colombia basins are located at the boundary between the south of the Caribbean plate and the northwestern corner of the South America plate. The tectonic history of the area has been dominated by an oblique convergence between these two plates. The interactions between the plates from the Paleocene to the Recent have driving the major tectonostratigraphic and structural features of the area, generating accretion prisms and compression belts (Deformed Belt of the South Caribbean) along with major strike-slip elements of transtension and transpression. Taking this into account, the goal of this work was to perform a tectono-stratigraphic and structural analysis of the deformed sedimentary sequences in the northwestern of the Guajira Peninsula recorded in the SPAN 3800 seismic line. Four tectonic events were recognized from the interpretation of the seismic facies and reflector terminations, which show the accumulation trends of the sequences and the structures styles in the study area: 1) Extensional event from the Eocene to the Oligocene, 2) Transpression from the early Miocene to the Pliocene, 3) Transtension from the late Miocene period to the Pliocene and 4) Event of diapirism after the early Pliocene.
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    Aporte al conocimiento de la geología volcánica en las inmediaciones de la población de Río Blanco (Cauca)
    (Universidad EAFIT, 2011) Téllez Arjona, Laura; Toro Villegas, Gloria Elena
    In the western flank of the volcano Sotará, in the vicinity of the population of Rio Blanco, we identified eleven units of volcanic origin. While the observation Window is limited to deposits located in the middle of the volcano, western flank, characteristics petrographics and stratigraphic relationships to define at least two possible stages of evolution in the magma chamber. These steps would relate topossible processes of recharge and magmatic differentiation which are evident. Although complete information is needed to raise an evolutionary history of volcanism of volcano Sotará, here arises a hypothesis about the evolution of the study based on stratigraphic, petrographic and geochemical volcanic deposits located in the Rio Blanco area, that must be confronted with future.
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    Caracterización petrográfica, geoquímica y geocronológica en rocas ígneas intrusivas de la cuenca Cauca-Patía (CCP), Departamento del Cauca, Colombia
    (Universidad EAFIT, 2012) Jerez Heredia, Edith Katherine; Toro Villegas, Gloria Elena
    South of Cauca-Patía basin, in Cauca department, Colombia, was sampled eleven bodies of Neogene intrusive rocks whose composition varies from diorite, granodiorite to granite. According to geochemical analysis, the samples exhibit calc-alkaline high-potassium, calc-alkaline and tholeitic affinity associated to granitoids type I. Geochronological data infer three events that have affected the area during Oligocene-Miocene, Lower Miocene-Middle Miocene and Upper Miocene, the latter correlates with the northern part of Cauca-Patía Basin. Intrusive igneous rocks coexist with Plio-Pleistocene volcanic rocks, that have had undergone several processes, but present chemical and mineralogical similarities. Key words: Cauca Patía Basin, granitoids; intrusive rocks.
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    Clasificación de las rocas ígneas y su importancia en la interpretación de su origen : ejemplo de las komatiitas y la textura spinifex
    (Universidad EAFIT, 2021) Agudelo Marín, Laura Michell; Bustamante Londoño, Camilo
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    Definición de escenarios de lahares en el volcán de Colima y análisis de susceptibilidad a inundación en la población de San Marcos, Jalisco, México
    (Universidad EAFIT, 2020) Pérez Hernández, Andrea; Pérez Mejía, Natalia Andrea; Capra Pedol, Lucia; Duque Trujillo, Jose Fernando
    Lahars are a mixture of water and sediments associated with volcanic processes, they can be generated by different factors such as melting glaciers, dam’s ruptures and heavy rainfall; this last factor occurs frequently in volcanoes, where rainfall/runoff process enhance erosion on main channels generating lahars that can reach large distances from their source, causing damages on the infrastructure of surrounding populations. The present work presents rain-triggered lahar susceptibility analysis along La Arena ravine and the effect on San Marcos; a village located 14 kilometers southeast of the Colima Volcano, in Mexico, between the limits of the states of Jalisco and Colima. To define the inundation limits, the program FLO-2D was chosen to model lahars, through data of rainfall events in 2018 and 2019. Using this information, a rainfall analysis was conducted and it was possible to identify those associated with the generation of lahars and to identify different scenarios depending on the total rainfall accumulation and its maximum intensity. Three different scenarios (small, intermediate and large) were identified and simulated with the FLO-2D code to analyze the effect on the population of San Marcos. Based on the numeric simulations hazard maps were made, which were used as a tool to study and analyze the area exposed of lahar inundation, considering that the three scenarios can generate an impact to the infrastructure. Aditionally, the study zone can be affected due to events of great magnitude, such as rainfall produced by hurricane events. Likewise, a probabilistic analysis was also conducted; where the large scenario presents low probability of occurrence, since these are events with regional (hurricane) character than those for the intermediate and small scenarios (rainy season). Through the analysis of the maps here presented, the population of San Marcos presents a low-medium hazard level to floods caused by lahars.
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    Inestabilidad volcánica y formación de flancos de colapso en la Zona Volcánica Norte de Suramérica
    (Universidad EAFIT, 2021) Palacios Benavides, Dumar Alexander; Duque Trujillo, José Fernando
    The north of South America is marked by the subduction of the Nazca and Cocos plate under the South American continental plate, this subduction has given rise to the Andes Mountains and has allowed the formation of the Northern Volcanism of the Andes. This volcanic area is formed in a transpressive environment where shear faults have been formed, which are the main source of instability in volcanoes, whose physical response is the collapse flanks, which are large mass movements that completely modify the volcanic building. To determine if there is a direct relationship in the formation of collapse flanks with the direction, location and displacement of the faults in the Northern Volcanic Zone, the directions of the faults and collapse flanks were measured in 37 volcanoes between Colombia and Ecuador. It was found that the faults have a mean direction of 030 ° (NE), the collapse flanks have two formation trends with respect to the direction of the faults, oblique 340 ° (NW) or perpendicular 290 ° (W). This is consistent with data obtained in analogous experiments by Lagmay et al. (2000), Wooler et al (2009) and Andrade et al., (2019). The formation of the flanks in the measured directions confirms that there is a direct relationship with the faults and, therefore, it can be stated that in the northern volcanic zone of the Andes these collapses tend to form mainly towards the WNW or NNW.
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    Interpretación sísmica de volcanes de lodo en la zona occidental del abanico del delta del Rio Magdalena, Caribe colombiano
    (Universidad EAFIT, 2012) Quintero Ramírez, Juan David; Orlando Castillo, Jaime
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    Kinematics and stress field analysis from a major strike-slip fault on the Northern Andes : the Palestina Fault System
    (Universidad EAFIT, 2020) Duque Trujillo, José Fernando; Saldarriaga Echeverri, Mónica; Duque Trujillo, José Fernando; Financiación parcial de la Vicerrectoría de Descubrimiento y creación de la Universidad EAFIT a través del Semillero de Investigación de Vulcanotectónica.
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    Máquina simuladora de fenómenos volcánicos para el Parque Interactivo Explora
    (2010-05) Gómez Palacio, Carolina; Rendón Ocampo, Jineth; Sierra Sierra, Lina María; Toro Ochoa, Sara Luisa; Góez Restrepo, Andrés Felipe
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    Mecanismos focales de sismos volcanotectónicos en el volcán Galeras
    (Universidad EAFIT, 2020) Vergara Herrera, Mariana; Sánchez Aguilar, John Jairo; Duque Trujillo, José Fernando
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    Relación Vp/Vs y heterogeneidad cortical en los Andes colombianos : implicaciones magmáticas y estructurales
    (Universidad EAFIT, 2024) Lizarazo Anaya, Hugo Esleider; Avellaneda Jiménez, David Santiago
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    Variaciones en los volúmenes de magma durante el Meso-Cenozoico a partir del registro de circones detríticos en el Oriente Colombiano
    (Universidad EAFIT, 2021) Chica Castaño, Laura Valentina; Franco Acevedo, Lorena; Bustamante Londoño, Camilo; Duque Trujillo, José Fernando