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Publications (172)
Resumen La capa de oolitos ferruginosos de Arroyofrío (Calloviense-Oxfordiense) representa un periodo de baja sedimentación donde se produjo un nivel condensado de acumulación biológica y otros componentes aloquímicos (ooides ferruginosos). Su distribución a escala regional presenta variaciones del espesor de la unidad y distintos eventos sedimenta...
Resumen La ASM puede permitir identificar distintos procesos genéticos o de deformación a partir del análisis del elipsoide de susceptibilidad y comparar con el elipsoide de deformación finita, al menos, en orientación y forma. En rocas sedimentarias es habitual la presencia de una foliación magnética paralela a la laminación sedimentaria (Kmin per...
En este trabajo se presentan las tres primeras dataciones radiométricas (U-Pb en circón) de las intrusiones subvolcánicas del Anticlinal de Montalbán (Cordillera Ibérica). Los resultados obtenidos indican una edad de 292 ± 2 Ma para un dique andesítico en Segura de Baños, 291 ± 8 para un sill andesítico en Hoz de la Vieja y 293 ± 3 Ma para un sill...
The Herrera Unit of the Iberian Chain (Cantabrian Zone, Iberian Massif) exhibits hundreds of outcrops of calc-alkaline igneous rocks that have been classically attributed to the Upper Carboniferous and the Lower Permian, although only two absolute radiometric ages have been reported. This work, with six new zircon LA-ICP-MS ages obtained from some...
A sill covering an area of more than 15 km2, several dykes up to 5 m thick and a volcanoclastic deposit crop out with similar petrology in the sector of Atienza (NW Iberian Chain, Spain). They consist of calc-alkaline porphyritic andesites with phenocrysts of plagioclase, amphibole, biotite, garnet and orthopyroxene. Based on U–Pb zircon analysis,...
From a 3-D reconstruction based on serial cross-sections, structural observations, and potential field geophysical data we characterize the major structural frame of the Moroccan Central High Atlas. Its overall structure shows two fold-and-thrust systems (each one showing particular features) at the northern and southern borders of the chain, resul...
The anisotropy of magnetic susceptibility provides valuable information on the imprint of the different tectonic processes occurred in the Central High Atlas (CHA), complementing the structural analysis and paleomagnetic information. Different types of magnetic ellipsoids, related with extensional, diapiric or intrusive processes occurred during th...
The interfolding remagnetizations are those acquired between two deformational stages, and they are common in inverted
sedimentary basins. They can be used as a tool to restore the structure at the remagnetization time (Villalaín et al., 2016).
This technique is used in the Central High Atlas (Morocco) in the frame of the CGL2016-77560-C2-P researc...
To deal with magnetic modelling, remanent magnetization as well as susceptibility of the rocks that generate an induced
magnetic field by the interaction with the Earth Magnetic field has to be addressed. In presence of primary and/or secondary
fields, it is essential to consider the total magnetization as the sum of induced and remanent components...
Los procesos de deformación sin-emplazamiento no suelen preservarse en cuerpos ígneos de grandes dimensiones. Sin embargo, la intrusión de Cerro Redondo (Unidad de Badules, Rama Aragonesa de la Cordillera Ibérica), con edad Cisuraliense (285 ± 2Ma), composición dacítica, textura porfídica y afinidad calco-alcalina, muestra unas características de a...
Una amplia distribución de grietas y otras patologías constructivas afectan al casco urbano de la localidad de Perdiguera (Zaragoza). A partir de la información oral se asume que dicho desarrollo es de aparición reciente y que afecta a la práctica totalidad del casco urbano histórico de la localidad. Las grietas indican tanto movimientos verticales...
We introduce a field trip to the southwestern termination of the Pyrenean sole thrust: the Santo Domingo anticline. The field trip is articulated in three main stops with panoramic views. We pursue to emphasize some outstanding characteristics of this structure: (A) the large-scale progressive (laterally angular) unconformity that crops out in its...
Epiglyptic thrusts can be misinterpreted as paleolandslides since they underwent displacement on the Earth surface. The Daroca Thrust has been object of controversial interpretations owing to (i) the particular style of its frontal structure (a thin slab of Cambrian dolostones overthrusting syntectonic Miocene deposits), and (ii) its relatively you...
Resumen En este trabajo se presenta una secuencia didáctica donde el alumnado analiza e interpreta datos con el objetivo de construir explicaciones científicas en un contexto de gamificación. Se utilizan las variaciones climáticas del pasado como eje central de la secuencia aprovechando la gran repercusión mediática que tiene el problema del cambio...
Shear zones, or their counterparts in near-surface conditions, the brittle fault zones, constitute crustal-scale, narrow, planar domains where deformation is strongly localized. The variation with depth of deformation conditions (P-T), rheology and strain rates entails a wide range of fault rock types, characterized by different petrofabrics and cl...
The Jurassic carbonates of the Central High Atlas (CHA) are affected by a widespread and homogeneous chemical remagnetization. This is an interfolding remagnetization (dated in ca. 100 Ma by comparison with the GAPWP of the African plate) that separates two deformational events; the first one is related to the basinal period in the Atlas (Triassic...
The Atlas system, an ENE-WSW intracontinental chain in the NW of Africa, grew because of the inversion of Mesozoic extensional basins during the Cenozoic convergence between the African and European plates. The Central High Atlas (CHA) is located in the mid-western sector of the chain and is characterized by (i) the presence of an Upper Triassic dé...
New residual magnetic map is presented to help decipher the magnetic imprints in the Central High Atlas (CHA) fold-and-thrust belt. The total intensity map shows a main direction mimicking the N070 trend which features the Atlas range. Detailed structural and paleomagnetic studies performed in the selected area demonstrate that similar shortening f...
Multiple constraints, including poorly known parameters, determine along-strike changes of frontal thrust structures in fold-and-thrust belts. Along the 400 km long, continuous Central Moroccan Atlas belt, structural style shows significant changes, preserving similar figures of shortening. This implies the absence of large-scale vertical-axes rota...
Resumen: En este trabajo se aplica el análisis de la anisotropía de la susceptibilidad magnética (ASM) con la finalidad de ayudar a descifrar la evolución mesozoica y cenozoica de un sector del Alto Atlas Central. El Atlas es la cadena intraplaca más importante del norte de África, resultado de una compleja evolución durante el Mesozoico y Cenozoic...
Resumen: Las cuencas sedimentarias invertidas con un importante apilamiento de sedimentos presentan frecuentemente remagnetizaciones muy intensas y ubicuas que, en la mayoría de los casos, sustituyen la magnetización primaria en áreas muy extensas. El Atlas es una cadena intracontinental generada por la inversión de cuencas extensionales mesozoicas...
En este artículo se discute la evolución sedimentaria del relleno neógeno de un área situada en la parte Noroeste de la Cordillera Ibérica que presenta depósitos fluviales y lacustres, y su relación con la tectónica alpina compresiva que afectó a una falla anteriormente extensional. Los análisis estratigráficos permiten caracterizar tres unidades t...
Twenty chain-scale cross-sections (between 50 and 100 km long) in the Central High Atlas (between Demnate and Rich, Morocco) considering potential field data and constrained by means of paleomagnetism (paleodips for cross-section reconstruction) and AMS (anisotropy of magnetic susceptibility as an indicator of internal deformation) reveal the inter...
Fault zones constitute areas of high permeability where fluids and minerals interactions are frequent, involving the neoformation and alteration of protolith-inherited, ferromagnetic and paramagnetic minerals. This fact entails that fault zones are in most cases characterized by a heterogeneous mineralogy which hinders their study through magnetic...
In this work we present the preliminary paleomagnetic results in the framework of an ambitious research project that is being carried out in the Central High Atlas (CHA). The Atlas is an intracontinental chain generated by the inversion of extensional Mesozoic basins due to the convergence between Africa and Europe during the Cenozoic. The deposits...
In this work the analysis of the anisotropy of magnetic susceptibility (AMS) has been applied to decipher the Mesozoic and Cenozoic evolution of the Central High Atlas. The Atlas is the most important intraplate mountain range in North Africa, resulting from a complex evolution during the Mesozoic and the Cenozoic. Its evolution during the Mesozoic...
Ceramic (brick) production requires detailed control of the source materials and the production conditions to obtain high quality and homogeneous products. In some cases, their color depends on the characteristics of the raw materials and the manufacturing process (temperature and oxidation conditions during heating), the stability of temperatures...
Deception island is one of the three most relevant Quaternary volcanic edifices in the northern Antarctic Peninsula region. The growth of the island is controlled by a main eruptive centre which configured a complete volcanostratigraphic sequence (Pre-, Syn- and Post-caldera stages). The final stages (historic eruptions) produced small cinder cones...
Structural analysis and Anisotropy of Magnetic Susceptibility are here applied to the fault zone (several hundreds of meters thick) associated with an E-W striking, 20 km-long segment of the Vallès-Penedès Fault (Catalan Coastal Ranges). The results obtained indicate a complex structure, mainly resulting from the imprint of Paleogene compressional...
El análisis de la interacción entre los procesos asociados a plumas mantélicas
y el contexto geodinámico sobre el que se encuentran ha propiciado
debates sobre su influencia y el desarrollo del vulcanismo insular. En el caso
del archipiélago de las Azores, el modelo de alineamiento de promontorios
insulares asociado a una pluma estática ha dado pas...
The Quaternary volcanism in the Bransfield Basin, northern Antarctic Peninsula region is related to the extension of the back-arc basin and the former Phoenix Plate subduction and roll-back under the South Shetlands Block, combined with the eastward motion of the Scotia Plate along the South Scotia Ridge. The main and more active volcanic edifices...
We perform a multidisciplinary study of biotite porphyroblasts and veinlet infills hosted in Cambrian strata of the hanging walls from the NW-SE-trending Datos, Jarque and Daroca thrusts (Iberian Chains). Stratigraphic and microstructural crosscutting features indicate that a biotite isograd runs parallel to the southeastern transects of the three...
La discordancia sintectónica de “El Calvario” es una estructura geológica resultante de esfuerzos tectónicos coetáneos con sedimentación. Se empezó a formar hace unos 30 millones de años (Ma) y cesó hace unos 15 Ma, más tarde que en otros lugares de la Cordillera Ibérica.
Anisotropy of magnetic susceptibility (AMS) has been applied to the study of shallow fault zones, although interpretation of the results requires establishing clear relationships between petrofabric and magnetic features, magnetic behaviour of fault rocks, and an extensive knowledge of P-T conditions. In this work, we demonstrate that magnetic meth...
The subvolcanic Cerro Redondo intrusion (Iberian Chain, Zaragoza), Lower Permian in age, show a dacitic composition and a calk-alcaline affi-nity. It is characterized by an internal structure defined by a subvertical la-yering with a variable spacing (1-25 cm) and it is affected by several magmatic folds.
The cartographic study and AMS (Anisotropy...
Major discontinuities in the Earth’s crust are expressed by faults that often cut across its whole thickness favoring, for example, the emplacement of magmas of mantelic origin. These long-lived faults are common in intra-plate environments and show multi-episodic activity that spans for hundred of million years and constitute first-order controls...
Resumen: La combinación de 20 nuevas estaciones de paleomagnetismo, con 17 estaciones previas y un modelo geomagnético ha permitido establecer la evolución multiepisódica del edificio volcánico cuaternario de la Isla Decepción (Antártida). Se han analizado tres estaciones en brechas volcánicas y dos estaciones en lavas pertenecientes a los material...
Resumen: El estudio de fábricas magnéticas (mediante la Anisotropía de la Susceptibilidad Magnética, ASM) es un método rápido y eficaz de determinar la petrofábrica de las rocas, pudiendo ser utilizada como indicador de la deformación. En este trabajo relacionamos, desde un punto de vista metodológico, la orientación de la ASM con la dirección de t...
Deception Island shows the most recent exposed active volcanism in the northern boundary of the Bransfield Trough. The succession of the volcanic sequence in the island is broadly divided into pre- and post-caldera collapse units although a well-constrained chronological identification of the well-defined successive volcanic episodes is still neede...
The Cambrian–lower Ordovician volcanic units of the South Armorican and Occitan Domains are analysed in a tectonostratigraphic survey of the French Variscan Belt. The South Armorican lavas consist of continental tholeiites in middle Cambrian–Furongian sequences related to continental break-up. A significant volcanic activity occurred in the Tremado...
El sector de Atienza se localiza en el enlace entre la Cordillera Ibérica y el Sistema Central (Fig. 1). Presenta un extenso sill subvolcánico de edad Pérmico inferior (Hernando et al., 1980, Lago et al., 2004), emplazado en la discordancia angular existente entre el Pérmico y las unidades infrayacentes.
La individualización actual de los afloramie...
El sector de Atienza se localiza en el enlace entre la Cordillera Ibérica y el Sistema Central (Fig. 1). Presenta un extenso sill subvolcánico de edad Pérmico inferior (Hernando et al., 1980, Lago et al., 2004), emplazado en la discordancia angular existente entre el Pérmico y las unidades infrayacentes. La individualización actual de los afloramie...
In Atienza area (W part of Iberian Chain) a set of Lower Permian andesitic hypovolcanic and volcanic outcrops occur. The hypovolcanic outcrops belong to a single sill of kilometer-scale and very variable thickness (up to several hundred meters), emplaced over the Lower Permian discontinuity. Their emplacement is related to the activity of the Borno...
Anisotropy of Magnetic susceptibility (AMS) has been traditionally used as an indirect approach for the characterization of mineral preferred orientation and rock petrofabric. In the Southern Central Pyrenees, a robust data set of magnetic fabrics covering a wide range of ages, structural context, and lithologies has been used for an assessment at...
Paleomagnetic studies have been conducted in the Pyrenees (and in its foreland basins) since the earlier sixties and have continued duringthe next decades, particularly increasing in the nineties. At the moment, the research interest is still growing as regards of the increasing in number of publications. This vast amount of data is due to several...
In the Western Central-Pyrenees numerous investigations during the past years have yielded an exceptional high density of localities (more than 700 sites) where the AMS and rock magnetic properties have been determined. This unique AMS dataset helps in understanding the orogenic evolution of the Pyrenees and its foreland basins. Processes related t...
The northern Montagne Noire possesses one of the most complete Cambrian-Lower Ordovician successions of West Gondwana. The strata are poorly fossiliferous, metamorphized and disturbed by Variscan tectonism, and their stratigraphic nomencla-ture dramatically multiplied by the designation of numerous informal units exclusively identifiable in their o...
The analyses of recent volcanic systems can encounter limitations due to recent eruptions hiding part of the geological history, where the geomorphological expression can present non-univocal interpretations or where modern relief and abrupt cliffs can decrease the accessibility to places that are suitable for detailed analysis. In the case of Dece...
The faults chosen for this study belong to the Iberian Chain (Northeastern Iberian Plate) and include two kine-matically different kinds of structures (thrusts and strike-slip), with well-developed fault gouges several tens or hundreds of meters thick (Datos Fault System and Daroca Fault) and thinner clayey layers linked to thrust surfaces (Cameros...
Deception Island shows a volcanism related to the Phoenix Plate subduction and roll-back under South Shetland Block in the present times. The development of the island is related to the evolution and collapse of a volcanic caldera, and this study is focused on the petrology, mineralogy and geochemistry of the post-caldera rocks. Lava flows, dikes a...
A detailed stratigraphic study based on the igneous outcrops located in the Tramuntana chain (Mallorca, Spain) and the observed magma-sediment interaction structures, show a main magmatic unit emplaced within Carnian-Norian sediments (in Keuper facies) which share common lithostratigraphic features with contemporary outcrops located on the NW margi...
We analyse paramagnetic, ferrimagnetic and frequency-dependent susceptibility in the southern Pyrenees and northern Ebro basin. The analyzed rocks show a wide range of values for the three parameters within the different lithological groups. Sandstones, shales and marls exhibit middle to high values of paramagnetic susceptibility while mudstones us...
Abstract: Brick production requires detailed control of the source materials and the production conditions in order to obtain high quality products both for strength and appearance. In some cases, their color depends on the characteristics of the raw materials and the manufacturing process (temperature and oxidation conditions during burning), stab...
Magnetic susceptibility in rocks is the sum of the contributions of different magnetic particles (paramagnetic, diamagnetic and ferromagnetic s.l.). These contributions can be measured at variable temperatures or at variable fields (hysteresis loops). Both are time-consuming techniques that cannot
be routinely used in magnetic fabrics analysis. In...
