Person:
Márquez González, Álvaro

First Name

Álvaro

Last Name

Márquez González

URI

https://hdl.handle.net/20.500.14352/80747

Affiliation

Universidad Complutense de Madrid

Faculty / Institute

Ciencias Geológicas

Department

Mineralogía y Petrología

Area

Petrología y Geoquímica

Identifiers

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Now showing 1 - 10 of 23

Strength of the lithosphere of Mercury
(Eos, Transactions American Geophysical Union. Western Pacific Geophysics Meeting, abstract, 2010) Egea González, Isabel; Ruiz Pérez, Javier; Fernández Rodríguez, Carlos; Márquez González, Álvaro; Lara López, Luisa M.
Forward mechanical modeling of thrust faults on Mercury
(European Planetary Science Congress. Abstracts, 2010) Egea González, Isabel; Ruiz Pérez, Javier; Fernández Rodríguez, Carlos; Márquez González, Álvaro
In this work we use a mechanical dislocation program to analyze the fault geometries and depths associated with a group of prominent lobate scarps in Mercury. We obtain depths of faulting of 30-40 km. This range overlaps with those previously obtained for Discovery Rupes and for two unnamed lobate scarps.
Mineralogical and geochemical evidence of magma mingling/mixing in the Sierra de las Cruces volcanic range, Mexican Volcanic Belt
(Journal of iberian geology, 2013) Velasco Tapia, F.; Rodríguez Saavedra, P.; Márquez González, Álvaro; Navarro de León, I.; Ignacio San José, Cristina de; Marroquín Guerra, S. G.; Quintanilla Garza, J.; Rangel Álvarez, O.M.
Pliocene – Pleistocene lava flows, mainly of dacitic composition, are exposed in the Sierra de las Cruces (SC) volcanic range within the Mexican Volcanic Belt (MVB). SC volcanic rocks are porphyritic, generally containing an assemblage of plagioclase + amphibole + orthopyroxene ± clinopyroxene ± quartz ± Fe-Ti oxides. Most of them exhibit diverse mineralogical and geochemical features that attest a magma mixing and mingling processes with concomitant fractional crystallization in which a small volume of hot andesite magma injects into dacitic magma. Both rock types are probably derived from partial melting of continental crust at different levels. The evidences of magma mixing and mingling include: (a) normal and sieved plagioclases in the same sample, rounded and embayed crystals, and armoured rims over the dissolved crystal surfaces; (b) subrounded, vesicular magmatic enclaves, ranging from a few millimeters to ~20 centimeters in size, with plagioclase + orthopyroxene + amphibole + quartz ± olivine ± Fe-Ti-oxides assemblage; (c) mineral chemistry evidence such as crystals with reaction rims or heterogeneous plagioclase compositions (inverse and oscillatory zoning or normally and inversely zoned crystals) in the same sample; and (d) elemental geochemical variations and trace-element ratio more akin to magma mixing and to some extent diffusion process. These andesitic enclaves could be considered as portions of the intermediate magma that did not mix completely (mingling) with the felsic host lavas, confirming the major role of magma mixing and mingling processes in the overall evolution of the MVB.
Multiple related flank collapses on volcanic oceanic islands: Evidence from the debris avalanche deposits in the Orotava Valley water galleries (Tenerife, Canary Islands)
(Journal of Volcanology and Geothermal Research, 2020) Coello Bravo, Juan Jesús; Márquez González, Álvaro; Herrera, Raquel; Huertas Coronel, María José; Ancochea Soto, Eumenio
Catastrophic flank collapses are common on oceanic islands of volcanic origin and often recognizable from the resulting morphology as large U-shaped embayments. However, post-collapse volcanic activity can infill such features, thereby obscuring them. This study takes advantage of a dense network of long sub-horizontal galleries for groundwater extraction in the flank collapse structure of the Orotava Valley (Tenerife, Canary Islands). This impressive landform is located in the overlapping zone of the NE Rift and the Cañadas Edifice of this volcanic island. Three debris avalanche deposits (DADs) have been identified inside the waterworks bored into the valley's western sector. The deeper layer, the Lower-DAD (L-DAD) was previously described under the local name of mortalón. This deposit lies unconformably over older volcanic rocks, where a prominent shear-zone is developed, here interpreted as the detachment plane of a massive rockslide. The L-DAD was therefore produced during the large failure event, the Orotava Landslide (OL), which carved the depression. Two younger DADs, much smaller in volume and not previously described, were also identified in the underground strata: the Intermediate- (I-DAD) and Upper-DAD (U-DAD). Both correlate well with the thick breccia deposits cropping out at the base of the marine cliff along the western coast of the valley. The I-DAD and U-DAD are conformably intercalated between the lava flows and other volcanics infilling the depression, and their bases are erosive/depositional features without structural deformation zones below them. Their stratigraphic setting and geometrical reconstruction indicate that both deposits were emplaced after the valley was formed by the OL event, in two successive failures here called Western Orotava Landslides (WOLs). The younger, called WOL-2, was dated at 494 ± 22 ka using the 40Ar/39Ar method. These two subaerial failures affected the upper eastern flank of the Cañadas III Edifice, previously destabilized when the OL failure event carved a steep wall at its foot, the western lateral escarpment of the Orotava Valley.
Depth of faulting and ancien theat flows in the Kuiper region of Mercury from lobate scarp topography
(Planetary and Space Science, 2012) Egea González, Isabel; Ruiz Pérez, Javier; Fernández Rodríguez, Carlos; Williams, Jean-Pierre; Márquez González, Álvaro; Lara López, Luisa M.
Mercurian lobate scarp sare interpreted to be the surface expressions of thrust faults formed by planetary cooling and contraction, which deformed the crust downto the brittle–ductile transition (BDT) dep that the time of faulting. In this work we have used a for ward modeling procedure in order to analyze the relation be tweens carptopography and fault geometrie sand dep thsas sociated with a group of prominent lobate scarps (Santa Maria Rupes and twoun named scarps) located inthe Kuiper region of Mercury for which Earth-based radar altimetry is available. Also aback thrust associated with one of the lobate scarps has been included in this study. We have obtained best fits for depthsof faul ting between 30 and 39 km; the results are consistent with the previous results for o ther lobate scarps on Mercury. The so-derived fault depths have been used to calculate surface heat flows for the time of faulting, taking into account crustal heat source sand a heterogeneous surface temperature due to the variable in solation pattern. Deduced surface heat flow sare be tween 19 and 39m Wm-2 for the Kuiper region, and between 22 and 43 mWm-2 for Discovery Rupes. Both BDT depth sand heat flows are consistent with the predictions of thermal history models for the range of time relevant for scarp formation.
Inventario de Lugares de Interés Geológico de las Islas Canarias
(Geotemas, 2022) Galindo, Inés; Martín González, E.; Sánchez, N.; Vegas, J.; Romero, C.; Lozano, G.; Márquez González, Álvaro; Coello Bravo, Juan Jesús; Casillas, Ramón; Martín Luis, C.; León Buendía, Ricardo; Vázquez, J. T.; Yepes Temiño, Jorge; Mangas, J.
En el marco de proyecto de investigación LIGCANARIAS (2018-2021) se ha realizado el Inventario de Lugares de Interés Geológico de las Islas Canarias, que forma parte del Inventario Español de Lugares de Interés Geológico (IELIG) para el dominio de este archipiélago. El inventario ha empleado la metodología del IELIG adaptada a un dominio geológico eminentemente volcánico, partiendo de los contextos geológicos regionales. Consta de 300 LIG: 53 en Gran Canaria, 47 en Tenerife, 54 en Lanzarote y Archipiélago Chinijo, 40 en Fuerteventura, 29 en La Palma, 23 en La Gomera y 21 en El Hierro. La principal novedad con respecto a los inventarios en otros dominios geológicos es la identificación de 33 LIG submarinos.
Monitoring Volcanic and Tectonic Sandbox Analogue Models Using the Kinect v2 Sensor
(Earth and Space Science, 2022) Rincón, Marta; Márquez González, Álvaro; Herrera, Raquel; Galland, O.; Sánchez Oro, J.; Concha, D.; Montemayor, A. S.
The measurement of surface deformation in analogue models of volcanic and tectonic processes is an area in continuous development. Properly quantifying topography change in analogue models is key for a useful comparison between experiment results and nature. The aim of this work is to evaluate the capabilities of the simple and cheap Microsoft® Kinect v2 sensor for monitoring analogue models made of granular materials. Microsoft® Kinect v2 is a video-gaming RedGreenBlue-Depth device combining an optical camera and an infrared distance measurement sensor. The precision of the device for model topography measurements has been quantified using 64 experiments, with variable granular materials materials and distance to the model. Additionally, we tested the capabilities of averaging several distance images to increase the precision. We have developed a specific software to facilitate the acquisition and processing of the Kinect v2 data in experiment monitoring. Our results show that measurement precision is material dependent: with clear-colored and fine-grained materials, a precision ∼1.0 mm for digital elevation models with a 1.6 mm pixel size can be obtained. We show that by averaging ≥5 consecutive images the distance precision can reach values as low as 0.5 mm. To show the Kinect v2 capabilities, we present monitoring results from case study experiments modeling tectonics and volcano deformation. The Kinect v2 achieves lower spatial resolutions and precision than more sophisticated techniques such as photogrammetry. However, Kinect v2 provides a cheap, straightforward and powerful tool for monitoring the topography changes in sandbox analogue models.
Contrasting catastrophic eruptions predicted by different intrusion and collapse scenarios
(Scientific Reports, 2018) Rincón, Marta; Márquez González, Álvaro; Herrera, Raquel; Alonso Torres, A.; Granja Bruña, José Luis; Wyk de Vries, Benjamin van
Catastrophic volcanic eruptions triggered by landslide collapses can jet upwards or blast sideways. Magma intrusion is related to both landslide-triggered eruptive scenarios (lateral or vertical), but it is not clear how such different responses are produced, nor if any precursor can be used for forecasting them. We approach this problem with physical analogue modelling enhanced with X-ray Multiple Detector Computed Tomography scanning, used to track evolution of internal intrusion, and its related faulting and surface deformation. We find that intrusions produce three different volcano deformation patterns, one of them involving asymmetric intrusion and deformation, with the early development of a listric slump fault producing pronounced slippage of one sector. This previously undescribed early deep potential slip surface provides a unified explanation for the two different eruptive scenarios (lateral vs. vertical). Lateral blast only occurs in flank collapse when the intrusion has risen into the sliding block. Otherwise, vertical rather than lateral expansion of magma is promoted by summit dilatation and flank buttressing. The distinctive surface deformation evolution detected opens the possibility to forecast the possible eruptive scenarios: laterally directed blast should only be expected when surface deformation begins to develop oblique to the first major fault.
Composición de las lavas asociadas a los colapsos de flanco del sector occidental del Valle de La Orotava (Tenerife)
(Geogaceta, 2022) Ancochea Soto, Eumenio; Huertas Coronel, María José; Márquez González, Álvaro; Herrera, Raquel; Coello Bravo, Juan Jesús
Se han analizado las lavas de dos galerías de agua excavadas en el valle de La Orotava que cortan la secuencia de relleno de la depresión generada tras el gran colapso de flanco de La Orotava (OL) y los dos colapsos de flancos menores (WOL-1 y WOL-2). Especialmente las lavas situadas inmediatamente encima y debajo de lo depósitos de avalancha asociados al WOL-2 (el U-DAD). Se trata mayoritariamente de basanitas, con algunos términos algo más evolucionados (traquibasaltos y traquiandesitas basálticas). Por sus características químicas parecen pertenecer todas a un mismo sistema magmático y ligadas entre sí por procesos sencillos de fraccionación de clinopiroxeno y, en menor medida, de olivino.Tras el colapso de flanco WOL-2 se aprecia que las rocas son, en general, menos evolucionadas, algo más alcalinas y, con frecuencia, muy ricas en fenocristales máficos.
El proyecto IVRIPARC: metodología para estimar el impacto del cambio globalsobre el patrimonio geológico de los parques nacionales de Canarias
(Geotemas, 2022) Vegas, J.; Baeza, E.; Díez Herrero, Andrés; Ferrer, N.; Galindo, Inés; Garrote Revilla, Julio; González Laguna, R.; Herrera, Raquel; Lario, Javier; Lozano, G.; Márquez González, Álvaro; Martín González, E.; Mayer, Pablo L.; Perucha, M.A.; Rodríguez Pascua, Miguel Angel; Romero, C.; Sánchez, N.
El patrimonio geológico y la geodiversidad de los parques nacionales contribuyen, junto con la biodiversidad, para que sean espacios naturales protegidos únicos en el país, pero también únicos a nivel mundial. El patrimonio geológico es de carácter no renovable, de tal forma que, si se pierden o degradan, lo hacen para siempre. Ante el escenario del cambio global, el patrimonio geológico de los parques nacionales canarios es muy vulnerable a los impactos rovocados por los cambios en la temperatura, avenidas torrenciales, tormentas extremas, sequías, desertificación y ascenso del nivel del mar, fundamentalmente, y a los impactos derivados de la actividad humana. Estos fenómenos provocan la activación de procesos geológicos que afectan directamente a su conservación, de tal forma que es necesario identificar los Lugares de Interés Geológico más amenazados, evaluar su incidencia y establecer los indicadores a escala de cada parque nacional para realizar su seguimiento. Conocer el estado de conservación actual, su vulnerabilidad y sus amenazas directas contribuirá a la gestión de los parques para el proceso de adaptación y mitigación del cambio global.