19 results on '"Dorado García, Olaya"'
Search Results
2. Structured elicitation of expert judgement in real-time eruption scenarios: an exercise for Piton de la Fournaise volcano, La Réunion island
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Agence Nationale de la Recherche (France), European Commission, Dorado García, Olaya [0000-0002-8062-4387], Zafrilla, Silvia [0000-0001-8117-9708], Tadini, Alessandro, Harris, Andrew, Morin, Julie, Bevilacqua, Andrea, Peltier, Aline, Aspinall, Willy, Ciolli, Stefano, Bachèlery, Patrick, Bernard, Benjamin, Biren, Jonas, Brum da Silveira, Antonio, Cayol, Valéry, Chevrel, Oryaëlle, Coppola, Diego, Dietterich, Hannah, Donovan, Amy, Dorado García, Olaya, Drenne, Stéphane, Dupéré, Olivier, Gurioli, Lucia, Kolzenburg, Stephan, Komorowski, Jean-Christophe, Labazuy, Philippe, Mangione, Domenico, Mannini, Stefano, Martel-Asselin, François, Médard, Etienne, Pailot-Bonnétat, Sophie, Rafflin, Victoria, Ramsey, Michael, Richter, Nicole, Vallejo, Silvia, Villeneuve, Nicolas, Zafrilla, Silvia, Agence Nationale de la Recherche (France), European Commission, Dorado García, Olaya [0000-0002-8062-4387], Zafrilla, Silvia [0000-0001-8117-9708], Tadini, Alessandro, Harris, Andrew, Morin, Julie, Bevilacqua, Andrea, Peltier, Aline, Aspinall, Willy, Ciolli, Stefano, Bachèlery, Patrick, Bernard, Benjamin, Biren, Jonas, Brum da Silveira, Antonio, Cayol, Valéry, Chevrel, Oryaëlle, Coppola, Diego, Dietterich, Hannah, Donovan, Amy, Dorado García, Olaya, Drenne, Stéphane, Dupéré, Olivier, Gurioli, Lucia, Kolzenburg, Stephan, Komorowski, Jean-Christophe, Labazuy, Philippe, Mangione, Domenico, Mannini, Stefano, Martel-Asselin, François, Médard, Etienne, Pailot-Bonnétat, Sophie, Rafflin, Victoria, Ramsey, Michael, Richter, Nicole, Vallejo, Silvia, Villeneuve, Nicolas, and Zafrilla, Silvia
- Abstract
Formalised elicitation of expert judgements has been used to help tackle several problematic societal issues, including volcanic crises and pandemic threats. We present an expert elicitation exercise for Piton de la Fournaise volcano, La Réunion island, held remotely in April 2021. This involved 28 experts from nine countries who considered a hypothetical effusive eruption crisis involving a new vent opening in a high-risk area. The tele-elicitation presented several challenges, but is a promising and workable option for application to future volcanic crises. Our exercise considered an “uncommon” eruptive scenario with a vent outside the present caldera and within inhabited areas, and provided uncertainty ranges for several hazard-related questions for such a scenario (e.g. probability of eruption within a defined timeframe; elapsed time until lava flow reaches a critical location, and other hazard management issues). Our exercise indicated that such a scenario would probably present very different characteristics compared to recent eruptions, and that it is fundamental to include well-prepared expert elicitations in updated civil protection evacuation plans to improve disaster response procedures.
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- 2022
3. The Volcanic Geoheritage of El Teide National Park (Tenerife, Canary Islands, Spain)
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CSIC - Unidad de Coordinación de Bibliotecas (UCB), European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Martí Molist, Joan [0000-0003-3930-8603], Dorado García, Olaya [0000-0002-8062-4387], López Saavedra, Marta [0000-0003-0292-6010], Martí Molist, Joan, Dorado García, Olaya, López Saavedra, Marta, CSIC - Unidad de Coordinación de Bibliotecas (UCB), European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Martí Molist, Joan [0000-0003-3930-8603], Dorado García, Olaya [0000-0002-8062-4387], López Saavedra, Marta [0000-0003-0292-6010], Martí Molist, Joan, Dorado García, Olaya, and López Saavedra, Marta
- Abstract
El Teide National Park on the island of Tenerife (Canary Islands) is home to one of the most spectacular volcanic landscapes in the world. Although the conservation of its geodiversity is not a major problem given that it is governed by strict Spanish laws on geoconservation and is, in addition, a UNESCO World Heritage site, the diffusion of its geological values among the general public is more of a challenge due to the lack of any specific program for scientific knowledge transfer to visitors. The volcanological history of this national park needs to be transmitted in a clear and comprehensible fashion. However, the lack of adequate outreach material and of any coherent and consistent narrative regarding the significance of the island’s geological heritage makes it difficult to incorporate its geological history into the minds of visitors. This engenders a perception of its geoheritage that underestimates its importance. To remedy this misconception, the following tasks need to be carried out: (1) a compilation of all current scientific knowledge of the geology and volcanology of the area; (2) the identification of key geosites that offer the best means of understanding the history and evolution of this volcanic area; (3) the production of outreach and diffusion programs specifically designed to transmit this scientific knowledge to the general public; and (4) the establishment of permanent training programs for park and tourist guides that will guarantee the efficacy of this knowledge transmission. This contribution summarizes the main aspects of the geological history of El Teide National Park, identifies the elements that best exhibit its geological heritage, discusses the main problems observed in transmitting these geological values to visitors, and provides some clues as to how to face up to these challenges.
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- 2022
4. Ba, Sr, and Rb feldspar/melt partitioning in recent eruptions from Teide-Pico Viejo volcanic complex, Tenerife: New insights into pre-eruptive processes
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Dorado García, Olaya, Wolff, J. A., Ramos, F. C., Martí Molist, Joan, Dorado García, Olaya, Wolff, J. A., Ramos, F. C., and Martí Molist, Joan
- Abstract
The behaviour of Group I and II elements during the petrogenesis of felsic igneous rocks is largely controlled by feldspar-liquid relationships. Numerous experimental studies have addressed plagioclase/melt element partitioning, with fewer studies devoted to potassium feldspar, and very few to albite-rich ternary-composition feldspar (An ∼ Or < Ab). However, the partition coefficient for Ba is known to increase by at least an order of magnitude through the crystallisation sequence sodic plagioclase–anorthoclase–potassium feldspar that is typical of sodic alkaline suites. Feldspars, glasses, and whole rocks in such suites may exhibit strong enrichments and depletions that can be used to track processes of crystal fractionation, cumulate formation, and cumulate recycling. Here, we review experimental feldspar/melt partitioning data for Ba, Sr, and Rb for all feldspars. Regression of available data provides expressions that appear to adequately model the compositional and temperature dependence of partition coefficients for albite-rich compositions. We have applied this model to feldspar and melt compositions of the products of several Holocene eruptions (Pico Viejo C, Pico Viejo H, Teide J2, Lavas Negras, Arenas Blancas, Montaña Rajada and Montaña Reventada) of the basanitic-phonolitic suite of the Teide-Pico Viejo volcanic system (Tenerife, Spain), using EPMA and LA-ICP-MS analyses. Comparing analysed feldspar/groundmass pairs with predicted partition coefficients obtained with the models provides a way of distinguishing between feldspars that are in or out of equilibrium with their host melt, and of reconstructing feldspar histories. The results demonstrate the existence of a distinct population of feldspars that had undergone accumulation, fusion and recrystallisation events, in Lavas Negras and Arenas Blancas flows. In addition, the anomalous trachytic composition of Montaña Reventada is due to melting of a feldspar-dominated cumulate. Application of these techniq
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- 2023
5. Unleashing alkali feldspar: Ra/Th ages and chemical and isotopic constraints on Holocene phonolite magmatism, Canary Islands
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New Mexico State University, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), European Commission, Brown, Bryce S., Ramos, Frank C., Wolff, J. A., Dorado García, Olaya, Martí Molist, Joan, New Mexico State University, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), European Commission, Brown, Bryce S., Ramos, Frank C., Wolff, J. A., Dorado García, Olaya, and Martí Molist, Joan
- Abstract
Accurately dating phenocrysts in Holocene volcanic rocks poses many challenges but is critical to placing magmatic processes that occur prior to eruption into a temporal frame-work. We dated alkali feldspar (i.e., orthoclase Or10 to Or46) crystals in four young phonolites from the Teide–Pico Viejo volcanic complex, Tenerife (Spain), using (226Ra)/(230Th) isotopes. Partition coefficients of Ra (DRa) and DRa/DBa of feldspars were predicted using an approach based on the lattice strain model, which yielded crystallization ages that overlap or predate known eruption ages for the Lavas Negras (ca. 1 ka), Montaña Blanca (ca. 2 ka), Arenas Blancas (ca. 2–4 ka), and Teide H (ca. 6 ka) phonolites. Crystallization of feldspar may occur up to the time of eruption, with >8 ka crystals also present, possibly suggesting extended magma differentiation times. However, feldspars yielding finite (226Ra)/(230Th) ages are mostly in equilibrium with the groundmass, unlike >8 ka crystals, which were therefore identified as antecrysts/xenocrysts. The 87Sr/86Sr ratios of feldspars indicate that crystallization predated late-stage assimilation, affecting 87Sr/86Sr ratios of some melts. The (226Ra)/(230Th) ages also constrain the tempo of phonolite magma evolution on Tenerife. Integration of (226Ra)/(230Th) ages with feldspar major elements, trace elements, and isotopes provides a powerful means for investigating crystallization histories using a dominant mineral that controls the overall magmatic evolution of phonolites on thousand-year time scales.
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- 2022
6. GEODA: Comisión de Divulgación de la Sociedad Geológica de España
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Schamuells, Stefania, Sanchez, G., Sanchez, O., Sanz-Pérez, D., and Dorado García, Olaya
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asociación ,Ciencias de la Tierra ,Divulgación ,SGE - Abstract
X Congreso Geológico de España, 5-7 Julio 2021, Vitoria - Gasteiz, Una de las tareas más relevantes de la ciencia es transmitir sus conocimientos más allá de lo estrictamente científico. La divulgación en Ciencias de la Tierra sigue siendo una tarea en desarrollo, una disciplina que en los últimos años ha ido ganando relevancia con la figura de las/os divulgadoras/es científicas/os. La Comisión de Divulgación de la Sociedad Geológica de España -GEODA- nace como respuesta a este movimiento en auge. Dentro de los objetivos de la Comisión se establece crear y compartir contenido único y original, con un lenguaje ameno, cercano e inclusivo, así como favorecer el intercambio de experiencias entre divulgadoras/es. Además pretende promover la divulgación geológica responsable y establecer mecanismos de difusión en todos los formatos disponibles que contribuyan a la información, formación, participación y sensibilización en la divulgación geológica y disciplinas afines. Se impulsará la creación y consolidación de un repositorio propio y base de datos web con las páginas de divulgación en Ciencias de la Tierra. A su vez se evaluará el desarrollo de acciones y estrategias de divulgación para crear vías de conexión con las administraciones públicas y demás instituciones sociales, científicas y medios de comunicación. Para todos estos fines se organizarán diversas actividades, como congresos y encuentros, charlas presenciales o virtuales, salidas de campo, actividades abiertas al público y encuentros de divulgadores. El contenido creado y compartido se publicará periódicamente en la web de GEODA y sus redes sociales (Instagram, Twitter y Facebook). Se realizarán reuniones de carácter divulgativo, publicaciones, investigaciones, estudios y artículos de interés general y cualquier otro medio que lleve a un mayor acercamiento y cooperación entre sus colaboradores y público, así como con grupos y asociaciones de características similares., One of the most important tasks of science is to transmit its knowledge beyond the scientific community. Earth Sciences outreach is still a work in progress, a discipline that in recent years has been gaining relevance with the figure of science communicators. The GEODA Outreach Commission of the Geological Society of Spain was born in response to this movement. One of the goals of the Commission is to create and share unique and original content, with a pleasant, friendly and inclusive language, and to promote the interchange of experiences between disseminators. In addition, to promote responsible geological outreach and to establish dissemination mechanisms in all formats that contribute to information, training, participation and awareness-raising in geological outreach and related disciplines. The consolidation and creation of a repository and web database of Earth Sciences outreach pages will be promoted. The development of dissemination actions and strategies will be evaluated in order to create and develop channels of connection with public administrations, social and scientific institutions and the media. For all these purposes, various activities will be organised: congresses and meetings, face-to-face or virtual talks, field trips, activities open to the public and meetings of disseminators. Contents created will be published periodically on the GEODA website and its social media (Instagram, Twitter and Facebook). The Commission will carry out informative meetings, research, scientific publications, studies and articles of general interest, and any other methods to strengthen the cooperation between GEODA’s collaborators and the public or other groups/associations with similar characteristics.
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- 2021
7. OhMagmaMia: acercando la Geología a través de las redes sociales
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Dorado García, Olaya and Hopfenblatt, Joaquin
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Divulgación ,Geología ,OhMagmaMia ,Redes sociales - Abstract
X Congreso Geológico de España, 5-7 Julio 2021, Vitoria - Gasteiz, La geología es una ciencia que progresivamente ha ido perdiendo presencia en el sistema educativo español, lo que tiene como consecuencia un interés cada vez menor por los estudios universitarios relacionados con las Ciencias de la Tierra y un nivel muy bajo de los estudiantes que llegan a las mismas (Pedrinaci, 2014). Esto se traduce en una sociedad cada vez menos consciente de la importancia de la geología en el ámbito científico, social y económico. En los últimos años han surgido numerosas iniciativas de divulgación con el objetivo de promover y entregar un mayor conocimiento de la geología a la sociedad. Las redes sociales y el medio digital se han convertido en una herramienta básica para llegar a un público más generalizado y, en especial, a las nuevas generaciones. Un ejemplo de este tipo de iniciativas lo encontramos en el Instagram de divulgación @OhMagmaMia, centrado en la publicación de material fotográfico (paisajes, afloramientos, muestras de mano o de lámina delgada) junto con esquemas geológicos explicativos simples y pequeñas descripciones. Esta forma de hacer divulgación ha sido bien recibida por el público (p.ej., geólogos, estudiantes y profesores de biología/geología), alcanzando más de 3200 seguidores en un año, con una audiencia internacional. Las estadísticas muestran un alcance máximo de unas 9000 impresiones, una tasa de implicación (engagement rate) del 10% y una media de 309 likes por post. La audiencia es predominantemente joven, con el 88,7% de los seguidores entre los 18 y los 34 años y con una mayor presencia femenina (55,4%). Este trabajo ha servido como base para otras actividades de divulgación como, por ejemplo, la realización de webinars y el desarrollo de los contenidos mediante hilos de Twitter, llegando a alcanzar más de 20000 impresiones., Geology is a science that has been progressively losing presence in the Spanish educational system, resulting in a decreasing interest in university studies related to Earth Sciences and a low level of knowledge in the students who reach them (Pedrinaci, 2014). This results in a society less aware of the importance of geology in the scientific, social and economic fields. In recent years, numerous outreach initiatives have emerged with the aim of promoting and delivering a greater knowledge of geology to society. Social networks and digital media have become a basic tool to reach a more generalized public and, especially, the new generations. An example of this type of initiative can be found in the outreach Instagram @OhMagmaMia, focused on publishing photographic material (landscapes, outcrops, hand samples or thin sections) together with simple explanatory geological diagrams and short descriptions. This type of outreach has been well received by the public (e.g., geologists, students and biology/geology teachers), reaching more than 3200 followers in one year, with an international audience. Statistics show a maximum reach of about 9000 impressions, an engagement rate of 10% and an average of 309 likes per post. The audience is predominantly young, with 88.7% of followers being between 18 and 34 years old and a greater female presence (55.4%). This initiative has served as a basis for other dissemination activities, such as webinars and the development of more detailed contents through Twitter threads, reaching more than 20000 impressions.
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- 2021
8. ¿Volverá el volcán Teide a hacer erupción?
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Martí Molist, Joan, Geyer, Adelina, and Dorado García, Olaya
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Tenerife ,riesgo volcánico ,procesos pre-eruptivos ,sistema magmático ,Teide - Abstract
X Congreso Geológico de España, 5-7 Julio 2021, Vitoria - Gasteiz, La cuantificación del peligro en los sistemas volcánicos caracterizados por un largo período de reposo es difícil debido a la falta de conocimiento de la historia volcánica pasada y también porqué en muchos casos el vulcanismo no se percibe como un problema potencial, ya que solo se lo considera una atracción para el turismo o una fuente de beneficio económico, ocultando así la necesidad de realizar una evaluación de riesgos. El Teide, en la isla de Tenerife (Islas Canarias), no es una excepción a esta regla general y, a pesar de ser uno de los volcanes compuestos más grandes del mundo, la población, los visitantes, e incluso algunos científicos lo consideran un volcán no activo. Sin embargo, la evidencia geológica y geofísica, incluida una gran diversidad de señales de monitoreo registradas durante las últimas décadas, así como una simple comparación con volcanes similares que han hecho erupción en los últimos tiempos después de cientos o incluso miles de años de inactividad, recomiendan considerar el Teide como un volcán activo y tomar las precauciones necesarias en una isla con casi un millón de habitantes permanentes y casi 5 millones de visitantes por año. ¿Cuál es el potencial para que el Teide vuelva a entrar en erupción? es la pregunta que debe responderse primero si asumimos el hecho de considerar al Teide como un volcán activo. Basado en el conocimiento vulcanológico, petrológico y geofísico actual, proponemos un modelo conceptual sobre los mecanismos de recarga de magma, la estructura del sistema magmático, los procesos pre-eruptivos y la dinámica del volcán Teide que ayuda a comprender su comportamiento y anticipar actividades futuras., The quantification of hazard in volcanic systems characterised by long repose period is difficult because the lack of knowledge of the past volcanic history. Also, in many cases, volcanism is not perceived as a potential problem, being only regarded as an attraction for tourism or a source of economic benefit, thus hiding the need to conduct hazard assessment. Teide, in the island of Tenerife (Canary Islands), is not an exception to this general rule and, despite being one of the largest composite volcanoes in the World, it is generally considered as a non-active volcano by population, visitors and even by some scientists. However, geological and geophysical evidence, including a large diversity of monitoring signals recorded during last decades, as well as a simple comparison with similar volcanoes that have erupted in recent times after hundreds or even thousands of years of quiescence, recommend to consider Teide as an active volcano. This implies taking into account the necessary precaution in an island with nearly one million of permanent inhabitants and nearly 5 millions of visitors per year. What is the potential for Teide to erupt again? is the question that relies behind the fact of considering it as active, and that needs to be answered first. Based on the current volcanological, petrological and geophysical knowledge we propose a conceptual model on the magma recharge mechanisms, structure of the plumbing system, and eruption triggers and dynamics of Teide volcano that helps to understand its behaviour and to anticipate future activity., Esta contribución es parte del proyecto EVE (EC-DG ECHO Ref: 826292)
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- 2021
9. Earth Scientist and Social Media: approaching our planet to young people and general public using comics and illustration.
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Schamuells, Stefania, Dorado García, Olaya, Hopfenblatt, Joaquin, Aulinas, M., Geyer, Adelina, Schamuells, Stefania, Dorado García, Olaya, Hopfenblatt, Joaquin, Aulinas, M., and Geyer, Adelina
- Abstract
Earth Sciences are booming in social media, an unexampled scenario a few years ago. In the last year, these numbers have increased because of the COVID-19, citizens are consuming even more digital information, at the same time they are looking for more simplified and easy-understanding scientific concepts. It is very important to remark the value of entertainment, humor, and visual contents, which have a light universal language to approach Earth Sciences to citizens and experts beyond the pure academic frontiers. In this work, we share some successful examples through the use of illustration, comic, and infographic content between two Instagram accounts (@ohmagmamia and @salirconunageologa) which addend more than 13,000 followers and have a potential reach up to 37.1k (based on their account insights). The audience for this content is international although it has gained great popularity among the Spanish-speaking public (the initial target audience), little by little creating an interesting and growing movement. Countries such as Chile, Argentina, Colombia, and Spain have the greatest impact according to statistics. Age range is between 18-34 years for 87% of the audience, with a clearly female predominance (55% in @Ohmagmamia and 60% in @Salirconunageologa). One of the principal goals of these accounts is to develop visual, artistic and easy-understanding content that fits the audience. On one hand @Ohmagmamia uses photographic material (e.g. landscapes, outcrops, hand specimen samples or micro-photographies), simple geological sketches and infographic content along with small descriptions in the post captions. This approach has been well received by both Earth Science students and non-professional enthusiasts, as well as biology-geology teachers and public examination trainers. On the other hand, @Salirconunageologa (Dating a geologist) uses cartoons, humour and comics to approach Earth Sciences to professionals and the general public. Its visual material focuse
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- 2021
10. Pre-eruptive conditions at satellite vent eruptions at Teide-Pico Viejo complex (Tenerife, Canary Islands)
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European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Consejo Superior de Investigaciones Científicas (España), Agence Nationale de la Recherche (France), Labex Voltaire, Dorado García, Olaya, Andújar, Juan, Martí Molist, Joan, Geyer, Adelina, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Consejo Superior de Investigaciones Científicas (España), Agence Nationale de la Recherche (France), Labex Voltaire, Dorado García, Olaya, Andújar, Juan, Martí Molist, Joan, and Geyer, Adelina
- Abstract
The Teide-Pico Viejo (T-PV) stratovolcanoes constitute one of the most potentially active volcanic complexes in Europe. T-PV was traditionally considered as a non-explosive system, but recent studies have pointed out the explosive character of their phonolitic magmas, including plinian and subplinian eruptions and the generation of pyroclastic density currents, as is evidenced in the volcanological record of the last 30 kyr. This explosive activity is mostly associated with satellite dome-like vents, which are characterised by presenting progressive transitions between explosive and effusive activity. In order to improve our understanding of these types of eruptions and their controlling mechanisms, we conducted a petrological and mineral characterisation of the products from the different eruptive phases of Pico Cabras dome. This permitted us to constrain the pre-eruptive conditions of the magma and to infer the potential factors that control the changes in the volcanic activity of dome-forming eruptions at T-PV and, in particular, the transition between explosive and effusive phases. Feldspar (anorthoclase and sanidine), clinopyroxene (diopside and augite), biotite, amphibole (kaersutite), magnetite, ilmenite, sodalite, and glass samples were analysed using EPMA and Micro-XRF. Our results suggest the presence of a compositionally, thermally, and volatile stratified magma chamber at 100 ± 50 MPa prior to the Pico Cabras eruption (between 9210 and 5911 years BP), which was characterised by a progressive change in the style of activity, from an efficiently fragmented magma dispersed by a sustained plume, to a poorly-fragmented, low-height, non-convective fountain (forming the fountain-fed lava dome) to a glass-bearing lava flow activity. The transition in the eruptive style was controlled by changes in temperature and amount of volatiles dissolved in the phonolitic melt (i.e., differences in magma rheology). The initial explosive phase was related to the emission of
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- 2021
11. ¿Se han vuelto locos los volcanes? Entrevista a Helga Kristin Torfadottir
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Dorado García, Olaya and Dorado García, Olaya
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Hace unos días mi madre me preguntó si era normal que de repente hubiera tantos volcanes en erupción, ya que en este último mes incluso los medios generalistas se han hecho eco de las erupciones de Etna (Italia), La Soufrière (San Vicente y las Granadinas), Pacaya (Guatemala) y por supuesto el nuevo volcán Islandés al que aún no se ponen de acuerdo en ponerle nombre (Fagradalsfjall, Geldingadalur, Krysuvik-Trolladyng ja¿ a cada cual más impronunciable).
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- 2021
12. Estudio de los mecanismos que controlan la transición explosiva a efusiva de las erupciones de domo del Complejo Teide-Pico Viejo (Tenerife, España)
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Dorado García, Olaya
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Teide-Pico Viejo ,volcanology ,volcanología - Abstract
VI Congreso Internacional de Geología del Perú, 16-20 noviembre, 2020, San Agustín de Arequipa, Perú
- Published
- 2020
13. Charla Hablemos de Geoquímica: ¿Qué nos dice sobre los procesos magmáticos?
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Dorado García, Olaya and Dorado García, Olaya
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Charla Hablemos de Geoquímica: ¿Qué nos dice sobre los procesos magmáticos? - por Olaya Dorado García. Organizado por GAGEOQ Grupo de Apoyo en Geoquímica
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- 2020
14. Mechanisms controlling explosive-effusive transition of Teide-Pico Viejo complex dome eruptions
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Dorado García, Olaya, Andújar, Juan, Martí Molist, Joan, Geyer, Adelina, Dorado García, Olaya, Andújar, Juan, Martí Molist, Joan, and Geyer, Adelina
- Abstract
The Teide-Pico Viejo (PT-PV) stratovolcanoes constitute one of the major potentially active volcanic complexes in Europe. PT-PV was traditionally considered as non-explosive system however, recent studies (ie. García et al. 2014) have pointed out that the explosive character of phonolitic magmas, including plinian and subplinian eruptions and generation of pyroclastic density currents, have also been significant within the last 30 kyr volcanological record. This explosive activity is mostly associated to satellite dome vents, like the one studied in this work, Pico Cabras. Dome-forming eruptions usually present sudden transitions between explosive and effusive activity. A better knowledge of this type of eruptions and about the main mechanisms controlling the changes in eruptive dynamics is required to undertake a comprehensive volcanic hazard assessment of Tenerife Island. In this study, we conduct a petrological and mineral characterization of the different eruption phases of Pico Cabras (pumice and lava flow samples for the explosive and effusive activity, respectively) with the aim of determining the factors that control these changes in the volcanic activity. Products were characterized with Scanning Electrom Microscope, and mineral phases, glass and volatile species (F, Cl) were analysed with electron microprobe and micro-XRF. The pre-eruptive conditions of the magma (pressure, temperature and water dissolved in the magma) were determined first by using available geothermobarometers, geohygrometers (Masotta et al., 2013; Mollo et al., 2015) and compared to those retrieved by using available phase equilibria experiments from the literature (ie. Andújar and Scaillet, 2012). Our results suggest the presence of a compositionally stratified magma chamber at 1 kbar±0.5kbar prior to Pico Cabras eruption in which the differences in the eruptive styles are controlled by the temperature and the amount of volatiles dissolved in the melt. The explosive phase is related to
- Published
- 2020
15. Estudio de los mecanismos que controlan la transición explosiva a efusiva de las erupciones de domo del complejo Teide-Pico Viejo
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Dorado García, Olaya, Martí i Molist, Joan, 1957, Geyer Traver, Adelina, Geyer, Adelina, Andújar Fernández, Juan Francisco, and Martí Molist, Joan
- Subjects
Master's theses ,Teide (Canàries) ,Erupcions volcàniques ,Teide, Pico del (Canary Islands) ,Volcanic eruptions ,Master's thesis ,Treballs de fi de màster - Abstract
Màster Oficial en Recursos Minerals i Riscos Geològics, Universitat de Barcelona - Universitat Autònoma de Barcelona, Facultat de Geologia. Curso: 2018-2019. Tutors: Joan Martí Molist y Adelina Geyer Traver, The Teide-Pico Viejo (PT-PV) stratovolcanoes constitute one of the major potentially active volcanic complexes in Europe. Traditionally, they have been considered to be non-explosive but recent studies have revealed that explosive activity of phonolitic magmas, including plinian and subplinian eruptions and generation of pyroclastic density currents, have also been significant. This explosive activity is mostly related to satellite dome vents, like the one studied in this work, Pico Cabras. Dome-forming eruptions usually present sudden transitions between explosive and effusive activity. A better knowledge of this type of eruptions and the main factors that controls these changes in eruptive styles are required to undertake a comprehensive volcanic hazard assessment of Tenerife Island. In this study, we conduct a petrological and mineral characterization of the different eruption phases of Pico Cabras with the aim of identifying the factors that control these changes in the volcanic activity. Using geothermobarometers, geohygrometers and comparing the results with experimental petrology data we present a model of a compositionally stratified magma chamber at 1 kbar±0.5kbar in which the differences in the eruptive styles are controled by the temperature and the amount of volatiles dissolved in the melt. The explosive phase is related to the upper part of the magma chamber at 725ºC±25ºC and 3,5-5 wt% H2O and the effusive phase with the main body of the chamber at 880ºC±30ºC and 2,5-3 wt% H2O. Also, we report for the first time the present of sodalite, a Cl-rich mineral, in recent PT-PV magmas. This mineral is an indicator of a significant amount of halogen gases within the fluid phase. The release of this kind of volatiles into the atmosphere (specially Cl and Br) have a direct impact on the ozone layer depletion.
- Published
- 2019
16. ICTJA-CSIC PhD Student Presentation Award 2019. Posters and Oral presentations
- Author
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Schamuells, Stefania, Dorado García, Olaya, Fernández-Prieto, Luis, Bach-Oller, Nuria, Jimenez-Munt, Ivone, Heida, Hanneke, Ibáñez Insa, Jordi, DeFelipe, Irene, and Kumar, Ajay
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PhD Student Presentation Award ,ICTJA - Abstract
Participación en la VIIª edición del ICTJA PhD Student Presentation Award (PSPA 2019). Presentaciones orales "Opposite polarity subduction zone architecture in the Alboran and Algerian Basins, Western Mediterranean", Ajay Kumar "Numerical modeling of flexural isostasy in the Western Mediterranean during the Messinian Salinity Crisis: implications for sea level and connectivity between sub-basins", Hanneke Heida Pósteres "First approximation to the petrography and mineral chemistry of the Maladeta and Andorra-Mont-Louis plutons (SIMPROP project)", Núria Bach "Mechanisms controlling explosive-effusive transition of Teide-Pico Viejo complex dome eruption", Olaya Dorado "About SIMPROP project. what is geochronology?", Stefania Schamuells
- Published
- 2019
17. Estudio de los mecanismos que controlan la transición explosiva a efusiva de las erupciones de domo del complejo Teide-Pico Viejo
- Author
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Geyer, Adelina, Andújar Fernández, Juan Francisco, Martí Molist, Joan, Dorado García, Olaya, Geyer, Adelina, Andújar Fernández, Juan Francisco, Martí Molist, Joan, and Dorado García, Olaya
- Published
- 2019
18. A radiography of Teide-Pico Viejo active volcanic complex, Tenerife, Canary Islands
- Author
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European Commission, Martí Molist, Joan, Geyer, Adelina, Pedrazzi, Dario, Dorado García, Olaya, Andújar, Juan, Jimenez, María, Scaillet, Bruno, European Commission, Martí Molist, Joan, Geyer, Adelina, Pedrazzi, Dario, Dorado García, Olaya, Andújar, Juan, Jimenez, María, and Scaillet, Bruno
- Abstract
The Teide-Pico Viejo active volcanic complex (TPV) started to grow up about 180 ka ago at the interior of the Las Cañadas caldera, in the island of Tenerife. This volcanic depression originated by several vertical collapses of the former Tenerife central volcanic edifice (Las Cañadas edifice) following explosive emptying of high-level magma chambers. Occasional lateral collapses of the volcano flanks also occurred and modified the northern side of the caldera depression. These twin stratovolcanoes derive from the interaction of two different shallow magma systems that evolved simultaneously, giving rise to a complete series from basalt to phonolite The structure and volcanic stratigraphy of the TPV was initially established based on a detailed field and petrological studies. However, this volcanic complex has also been the focus of a number of geophysical studies that have provided a detailed imaging of its interior, including its plumbing system. The combination of these geophysical results with those from the previous stratigraphic and petrological studies, as well as the information gathered from the geology of the subhorizontal water galleries drilled on different sector of Tenerife, and from recent experimental petrology studies, offers a unique set of data that permits to construct a detailed 3D model of one of the largest intraplate oceanic volcanoes of the World. In this contribution we present the first 3D model of the TPV complex obtained by combining the available geological and geophysical data and discuss about the implications of the resulting model on volcano evolution, eruption dynamics, and potential for future activity.
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- 2019
19. The Volcanic Geoheritage of El Teide National Park (Tenerife, Canary Islands, Spain)
- Author
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Joan Martí-Molist, Olaya Dorado-García, Marta López-Saavedra, CSIC - Unidad de Coordinación de Bibliotecas (UCB), European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Martí Molist, Joan, Dorado García, Olaya, López Saavedra, Marta, Martí Molist, Joan [0000-0003-3930-8603], Dorado García, Olaya [0000-0002-8062-4387], and López Saavedra, Marta [0000-0003-0292-6010]
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Geodiversity ,Tenerife ,El Teide National Park ,Geography, Planning and Development ,Earth and Planetary Sciences (miscellaneous) ,Conservation ,Volcanic geoheritage ,Nature and Landscape Conservation - Abstract
El Teide National Park on the island of Tenerife (Canary Islands) is home to one of the most spectacular volcanic landscapes in the world. Although the conservation of its geodiversity is not a major problem given that it is governed by strict Spanish laws on geoconservation and is, in addition, a UNESCO World Heritage site, the diffusion of its geological values among the general public is more of a challenge due to the lack of any specific program for scientific knowledge transfer to visitors. The volcanological history of this national park needs to be transmitted in a clear and comprehensible fashion. However, the lack of adequate outreach material and of any coherent and consistent narrative regarding the significance of the island’s geological heritage makes it difficult to incorporate its geological history into the minds of visitors. This engenders a perception of its geoheritage that underestimates its importance. To remedy this misconception, the following tasks need to be carried out: (1) a compilation of all current scientific knowledge of the geology and volcanology of the area; (2) the identification of key geosites that offer the best means of understanding the history and evolution of this volcanic area; (3) the production of outreach and diffusion programs specifically designed to transmit this scientific knowledge to the general public; and (4) the establishment of permanent training programs for park and tourist guides that will guarantee the efficacy of this knowledge transmission. This contribution summarizes the main aspects of the geological history of El Teide National Park, identifies the elements that best exhibit its geological heritage, discusses the main problems observed in transmitting these geological values to visitors, and provides some clues as to how to face up to these challenges., Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. Partial support was provided by funding from different EC and national grants (TEIDE: European Laboratory Volcano, ERUPT, EXPLORIS (EVR1-CT-2002–40026), and VUELCO (FP7-ENV-2011 282729), MCyT TECTOTENE, MCyT FONOTEN, MEC TEGETEIDE (CGL2004-21643-E), MEC TENERISK (CGL-2006–13830), MEC PR-2006–0499, MICINN (CGL2010-11983-E), EXPLOTEI MICINN (CGL2008-04264), MEC (CGL-2004–21247), and EVE (EC DG ECHO H2020_826292).
- Published
- 2022
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