Person:
Huertas Coronel, María José

First Name

María José

Last Name

Huertas Coronel

Affiliation

Universidad Complutense de Madrid

Faculty / Institute

Ciencias Geológicas

Department

Mineralogía y Petrología

Area

Petrología y Geoquímica

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Now showing 1 - 10 of 65

Volcanoestratigrafía y evolución geológica de La Gomera
(2008) Ancochea Soto, Eumenio; Herrera, Raquel; Huertas Coronel, María José; Hernán Reguera, Francisco; Brändle, J.L.
La isla de la Gomera (379 km2) esta situada en la parte occidental del archipiélago canario. Sus características geológicas son muy diferentes a las de las otras islas menores (La Palma y Hierro), pues es mucho más antigua y es la única en la que no existe actividad volcánica cuaternaria. La hace también especial el que para los modelos de génesis del archipiélago que suponen la existencia de una migración de la actividad volcánica de este a oeste, representa la excepción, pues se sitúa al oeste a pesar de ser casi tan antigua como otras islas más orientales.
Geometría del enjambre de diques cónicos de Vallehermoso La Gomera (Islas Canarias)
(Sociedad Geológica de España, 2000-05) Hernán, F.; Cubas, C.R.; Huertas Coronel, María José; Brandle, J.L.; Ancochea Soto, Eumenio
A mainly phonolitic, 10 km in diameter, cone-sheet complex crops out on the northern area of La Gomera. The swarm intrudes into the Basal Complex, The Old BasaIts and other rocks of the Trachytic-phonolitic Complex to which they belong. The cone-sheet complex center lies south of Vallehermoso. Most of the dykes in the care of the structure are "conic dome-sheets" which start to be evidenced 400m far from the center and dip over 50°. In the surrounding area the dome-sheets are less frequent while simple canesheets are more abundant and dip more gently towards the periphery. From the analysis of their dips and distribution a single conic structure is deduced. The cane-sheets were originally connected to a hypothetical dome-shaped magmatic body whose uppermost part is at present located 7350m under sea level.
Mecanismos de diferenciación ígnea en diques de pórfido
(Seminario de Estudos Galegos. Area de Xeoloxía e Minería ; Instituto Universitario de Xeoloxía "Isidro Parga Pondal", 1987) Villaseca González, Carlos; Huertas Coronel, María José
Se aborda de manera teórica los principales procesos operativos de diferenciación ígnea en secciones transversales de los conductos filonianos, aplicándolo a los diques de pórfido granítico s. 1. del Sistema Central Español. Para estos magmas se deduce un régimen de flujo marcadamente laminar en el conducto (:s 30 mts, potencia). Estos caracteres impiden tanto la efectividad de franccionamiento cristalino ",in situ», como grados importantes de asimilación o contaminación en ruta hacia la superficie, Los diques simples, de flujos isoviscosos, van a diferenciarse por fenómenos, principalmente, de flujo ígneo, en ocasiones combinado con la presencia de varios magmas fluyendo a la vez en el mismo pulso (conductos gruesos o flujos veloces). Con estos mecanismos se tenderá a generar evoluciones del tipo félsico a máfico, de borde a centro del dique de pórfido. Los diques compuestos se formarán cuando los magmas son suficientemente contrastados en sus caracteres físicos (viscosidad, p_ ej_) y químicos, o cuando son varios pulsos magmáticos a través del mismo conducto. En estos casos podría haber fenómenos de mezcla magmática si la diferencia de viscosidad es alta y uno de esos magmas es poco viscoso (magmas básicos). En estos casos podrían generarse zonas básicas en el borde, o no, de los diques de pórfido. En resumen la diferenciación de flujo, la mezcla magmática y la asociación de varios líquidos fluyendo en el mismo conducto (de manera simultánea o por pulsos magmáticos algo separados en el tiempo), parecen ser los mecanismos de diferenciación ígnea más efectivos de estos magmas graníticos que fluyen en angostos conductos filonianos.
Age and composition of the Amanay Seamount, Canary Islands
(Springer Verlag, 2003) Ancochea Soto, Eumenio; Huertas Coronel, María José
A number of samples have been dredged from the upper parts of Amanay and El Banquete Seamounts, yet volcanic materials have been collected only on Amanay Seamount. Based on textural features and the presence or absence of kaersutite, two main types of olivine pyroxene basaltic rocks have been identified. The rocks are basanites with high enrichment in the most incompatible elements, similar to that displayed by Ocean Island Basalts. Samples from Amanay Seamount formed due to a low degree of melting of an enriched mantle, very similar to that which probably caused the Miocene volcanic activity of Fuerteventura. The age of Amanay volcanic rocks, 15.3 ± 0.4 and 13.1 ± 0.3 Ma, is similar to those of the older volcanic units exposed in the nearby islands (Gran Canaria, Fuerteventura and Lanzarote). This proves the formation of a separate submarine volcanic edifice coeval with the other edifices of the Eastern Canarian Volcanic Ridge. Volcanic activity on the submarine edifice is thought to have ceased at about 13 Ma, simultaneous with the adjacent main volcanic construction.
Petrography and provenance of beach sands from volcanic oceanic islands: Cabo Verde, Atlantic Ocean
(SEPM, 2021-03-12) Le Pera, Emilia; Morrone, Consuele; Arribas Mocoroa, José; Arribas Mocoroa, María Eugenia; Ancochea Soto, Eumenio; Huertas Coronel, María José
Volcaniclastic deposits have been extensively analyzed in several settings in the Pacific and circum-Pacific area. Recent volcaniclastic products from Atlantic oceanic islands offer another opportunity to add new data and be an important key to a better understanding of volcanic imprints on the sedimentary record. The Cabo Verde archipelago is an Atlantic Oceanic plateau with late Oligocene to Holocene volcanism. Outcrops consist mainly of mafic and strongly alkaline and ultra-alkaline volcanic (pyroclastic and lava flows) and less abundant intrusive rocks with minor carbonatites and carbonate sedimentary rocks, constituting a multiple-provenance assemblage for the sandy beaches surrounding the islands. Currently, climate is semiarid to hyperarid with ephemeral and intermittent streams. Thirty-six samples of beach sand from six principal Cabo Verde Islands were selected for petrographic inspection. On average, beach sands constitute a volcanolithic petrofacies. A relative increase in carbonate limeclasts and bioclasts dilutes the pure volcaniclastic contribution mainly on the older island beaches (Sao Vicente, Sal, and Boa Vista). The major components of Cabo Verde beach sands are highly variable; in general, composition is a function of island morphological evolution and age. Thus, beaches of the younger islands (Sao Nicolau, Santiago, and Fogo) consist mainly of volcanic lithic fragments, and monomineralic grains of dense minerals such as olivine, pyroxene, and amphibole, and single grains of plagioclase and anorthoclase. By contrast, beaches of older eastern islands (Sal, Boa Vista, and Sao Vicente) contain more calcareous bioclasts, micritic and/or sparitic sedimentary lithic grains. The presence of carbonate grains suggests provenance from shallow carbonate platforms developed during periods of volcanic quiescence. Cabo Verde volcanic sandy fractions are composed mostly of black, brown, and orange glassy volcanic particles exhibiting microlitic, lathwork, and vitric textures. Volcanic particles with lathwork textures are linked to mafic provenance assemblages (nephelinites, basanites, and tephrites). The content of glassy particles is nearly constant in all beaches, and both hydroclastic and epiclastic processes are reflected in these populations of glassy grains. Boa Vista, Sao Vicente, and Santiago beaches contain higher proportions of sideromelane, linked to recent coastal volcanism, and lower proportions of orange and black glassy particles. The concentration of orange glass particles in the beaches of Santiago Island is higher than in the other island beaches. These orange glassy textures have been preserved even if they were sourced from the intensely altered Ancient Eruptive Complex, representing the pre-Miocene seamount stage of Santiago Island. A very small percentage of altered labile monocrystalline grains such as olivine and the paucity of altered volcanic components reflect the weathering-limited erosion regime of the islands. The exposed phonolitic lava flows that occupy only a minor surface part of the inland source produce particles with microlitic texture in sand beaches. Thus, this texture is not exclusive to andesitic, basaltic, and basaltic andesites sources, suggesting the need for a review of these particles as source-sensitive provenance signals.
Geología de la isla de Branco (Cabo Verde)
(Sociedad Geológica de España, 2006-01) Ancochea Soto, Eumenio; Brandle, J.L.; Hernán, F.; Huertas Coronel, María José
The morphological, structural and volcanological aspects of Branco, an island of the Cape Verde Archipelago, are described and interpreted in this work. The isle consists of a 700 m thick pile of basalt lava flows and scarce pyroclastics crossed by several families of dikes. The structure of the island could correspond to the remaining fragment of a primitive large shield volcano. The main hypothetical emission centre could once be situated between the present islands of Santa Luzia and Branco.
Mecanismos de evolución magmática en los diques microdioríticos de la sierra de Guadarrama
(Sociedad Geológica de España, 1991-11) Huertas Coronel, María José; Ancochea Soto, Eumenio
In the Central System of Spain outcrop se vera I dyke swarms of late-hercynian age. They are mainly composed by granitic porphyry and microdioritic dykes. The last one, when globaly considered, show scattering in the contents of most of the major and trace elements. When we study the individual microdioritic swarms, it can be observed that they exhibit more defined compositional and evolutionary trends. These trends are different from one microdioritic swarm to another. The variations can be justified by different crystal fractionation models and reflect heterogeneities in the source or differences on the melting process.
Los anfíboles de los volcanes de las islas Columbretes (Mediterráneo occidental)
(Sociedad Geológica de España, 2021) Ancochea Soto, Eumenio; Huertas Coronel, María José
In all the Columbretes islands there are rocks with amphiboles, in many cases in accidental fragments within the tuffs. All of them are magnesium-hastingsites, more or less zoned and reabsorbed. The amphiboles of the central islands of the main N-S alignment have formed at lower temperature and pressure than the rest. The calculated formation depths are approximately the Moho depth for the area.
Nuevas edades K-Ar de las rocas volcánicas de la isla de Tenerife
(Sociedad Geológica de España., 2000) Bellido Mulas, Félix; Cueto, L.A.; Ancochea Soto, Eumenio; Huertas Coronel, María José; Brändle Matesanz, José Luis
Six new isotopic age determinations were established in volcanic rocks of Tenerife. These data belong to different units of the main volcanic edifices and the results allow us to get a more accurate knowledge of the eruptive history of the island. One of these ages corresponds to a trachyandesitic flow of the Upper Unit of the Anaga Old Edifice (Old Basaltic Series) and the result, 3,38 ±0,19 Ma matches with the age interval established by previous authors for this unit (3,70 - 3,28 Ma). Three ages belong to units of the Cañadas Edifice and the results are 1,59 ± 0,19 Ma, 2,94 ± 0,15 Ma and 4,0 ± 0,2 Ma. This shows that the felsic volcanic activity started in the very early stages of the Cañadas Edifice evolution and it shows also that there are a partial overlap with the youngest episodes of the Old Tenerife Edifices. The age determination on a phonolitic plug that intrudes on basaltic flows of the Dorsal Edifice gives a result of 1,16 ± 0,09 Ma. The last age data of this work belongs to a mafic phonolite flow of a peripherial volcano (Taco Mountain). The result, 0,55 ± 0,06 Ma reinforces the evidence of felsic-intermediate volcanic activity in several peripherial volcanoes contemporary with the Cañadas Edifice lifespan.
Características composicionales y procesos de evolución magmática en el Complejo Volcánico Central (I y II) de Fuerteventura (Islas Canarias)
(Sociedad Geológica de España, 1997-05) Ancochea Soto, Eumenio; Brandle, J.L.; Huertas Coronel, María José; Hernán, F.; Cubas, C.R.
The Central Vólcanic Complex I (CVC-I) consists maihly of mildly alkaline basalts, many of them ankaramitic. The compositional differences observed are explained by fractíonation and extraction (rates between 20% and 30%) of clinopyroxene (60%), olivine (20-25%) and titanomagnetite. The CVC-II shows two different stages. The lower one of mildly alkaline affiníty has an age comprised between 20 and 22 Ma, the more alkalic: upper orle has a mote recent age about 18Ma. The crystallization models for the lower stage are different depending on the composition considered to be the most primary or less differentiated magma. The crystallization rates are comprised between 20 and 30%. The compositional variation observed in the basalts from the upper stage may be due to crystallization rates from 20-25%, mainly olivine (50c70%) and clinopyroxene. The transition to trachyandesites, both in the CVC-I and the CVC-II¡ supposes a change in crystallization which is then dominated by cilinopyroxene and plagioclase. The further transition to trachytes is a process controlled by plagioclase extraction.