Aránzazu Luzón

University of Zaragoza | UNIZAR · Department of Earth Sciences

La Formación Villanueva de Huerva en la subcuenca de Aguilón (NE de España) es una unidad sinrift Valanginiense Hauteriviense inferior que incluye un intervalo cíclico con 88 secuencias de profundización-somerización lacustre controladas por el ciclo de precesión. Las facies carbonatadas tienen como componente mayoritario dolomita. Sus característi...

The Cretaceous is widely considered to have been a period subjected to super-greenhouse conditions. Here, we provide multiscale sedimentologic evidence of glaciers developing at mid-paleolatitudes (∼45°N) in continental Iberia during the Hauterivian cold snap. Striated and faceted ice-rafted glacial dropstones (cobble to boulder size) and striated...

The Calamocha fault is an 18-km-long, NNW–SSE striking pure normal fault that moves down the northern sector of the Jiloca graben with respect to the Neogene infill of the Calatayud basin (central Iberian Chain). Its structure and kinematics are characterized by means of detailed geological mapping, morphotectonic analysis and data recording at the...

The northern sector of the Teruel Basin (Spain) houses a dense and continuous record of late Neogene mammal fossil sites, as well as numerous biostratigraphic and magnetostratigraphic information making it a reference basin to define and refine the European mammal biostratigraphy from the Vallesian to the Villafranchian. The Neogene mammal chronolo...

The Ebro Basin (Spain) is one of the few worldwide areas where Palaeogene avian and mammal tracksites have been found. A new unpublished tracksite known as La Sagarreta is here described. The tracksite is located in a sandstone-dominated outcrop from the Early Oligocene Peralta Formation in the northern-central sector of the basin. Six different ic...

Paleoclimate reconstructions are mostly based on continuous oceanic records, but continental records, controlled by global and regional conditions, are paramount in identifying long- and short-term climatic variability between regions and investigating forcing mechanisms. Here we present a high-resolution lacustrine log from a western Mediterranean...

The NNW-SSE trending Sierra Palomera fault is characterized as an active, nearly pure extensional fault with mean transport direction towards N230°E, consistent with the ENE-WSW extension trajectories of the recent to present-day regional stress field. Its macrostructure is described from surface geology and magnetometric and electromagnetic survey...

The South Pyrenean triangle zone represents the southernmost front of the Pyrenees at its central portion deforming the Upper Eocene‐Miocene Ebro Basin deposits. Two main structures characterize its western termination, the Barbastro anticline and the San Román backthrust, which detached on the Barbastro Formation (and lateral equivalents), an Uppe...

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...

The NNW-SSE trending Teruel Basin rift is the largest Late Miocene-Quaternary extensional intracontinental structure located within the central-eastern Iberian Chain (Spain). The structural and morphotectonic study carried out in the central-northern part of this half graben basin (north of Teruel city) has allowed us to analyse rift segmentation,...

Abstract The northern part of the eastern margin of the extensional Neogene Teruel Basin (central-eastern Spain) consists of a non-linear, zigzag fault zone made of alternating ca. 2 km long, NNW-SSE trending segments and shorter NNE-SSW ones. Good outcrop conditions made possible a comprehensive integrated stratigraphic and structural study, espec...

The E–W trending, nearly pure extensional Valdecebro fault zone is a transverse structure at the central sector of the N–S Teruel graben. It was activated by the Late Ruscinian (Early Pliocene, ca. 3.7 Ma), giving rise to structural rearrangement of the graben margin. Until the Late Pleistocene, it has accommodated a net slip ca. 205 m, with slip r...

Three iron oxides-rich microsphere types (Type I to III) were detected in an Holocene 17 m-thick stratigraphic succession located in the Iberian Range (NE Spain). Lithofacies features indicate that the studied materials were generated in an alluvial-dominated setting, with a channeled area fringed by floodplain zones. During high water levels and h...

The Teruel Basin is a NNE-SSW trending intracontinental extensional basin located in central-eastern Iberia. It is asymmetrically bounded to the east by a major fault zone, but intrabasinal faults with diverse orientation (NNE-SSW to NE-SW, E-W, or NW-SE) also appear. Offsets of the successive sedimentary units and of two planation surfaces reveal...

In the central Ebro Basin, solution of Neogene evaporites creates mantled karst on the Quaternary alluvial deposits. Karst has been active at least since Early Pleistocene, as remains of deformation paleostructures prove, being a very active process at present. Sediments involved in paleodolines helps to determine its geometry, genetic processes an...

The relationship of independence, interaction or linkage between two neighbouring intraplate active extensional faults, the Teruel and Concud faults, are investigated from structural and paleoseismological data, and the results are discussed to improve seismic hazard assessment for the region. This paper provides the structural and paleoseismologic...

This work aims to bring to light the great wealth of mammal and avian tracksites of the Cenozoic of the southern margin of the Pyrenees and the northern Ebro Basin (Aragon, northeast Spain) by designing a palaeoichnological itinerary that includes the main tracksites. Scientific research in these fields is currently being carried out with very inte...

Pleistocene detrital deposits in the central Ebro Basin frequently show deformation features due mainly to karstification in the underlying Neogene evaporites. In 123 cases, estimation of parameters of shape and minimum volume of materials involved was accomplished. Six of them were analysed in more detail to establish the main processes involved i...

The uppermost Pleistocene and Holocene palaeoenvironmental evolution of the A~namaza river valley (Iberian Range, NE Spain) is deduced using multidisciplinary approach including stratigraphical, mineralogical, palynological, geochemical, geophysical methods and drilling. Main changes were registered in distinct subenvironments of a carbonate fluvia...

RESUMEN Se pretende poner en valor la gran riqueza de yacimientos de icnitas de mamíferos y aves del Cenozoico del Prepirineo y del Valle del Ebro de Aragón diseñando un itinerario paleoicnológico que incluya los principales yacimientos. Además de la importancia científica, se quiere destacar el valor de este patrimonio paleontológico como recurso...

The Barbastro-Balaguer anticline is located in the central sector of the south pyrenean front. In this work we introduce the first paleomagnetic data in this structure seeking to shed light on whether there are vertical axis rotations related to its emplacement. 19 stations were sampled evenly distributed along the anticline, mostly focused on the...

In this work we present a structural study of the western end of the Barbastro-Balaguer anticline. We elaborated two new cross sections based on a geological map synthesis, new structural data, seismic reflection profiles and the reinterpretation of well log data. These two cross sections together with an already published one allow to describe the...

his work describes soft-sediment deformation structures (clastic dykes, load structures, diapirs, slumps, nodulizations or mudcracks) identified in three sections (Concud, Ramblillas and Masada Cociero) in the Iberian Range, Spain. These sections were logged from boreholes and outcrops in Upper Pliocene-Lower Pleistocene deposits of the Teruel-Conc...

The Quaternary Añavieja-Dévanos tufa system is located in the northern sector of the Iberian Chain. It has been previously tackled by means sedimentological studies focused on the available outcrops and some boreholes. They have permitted the proposal of a sedimentary scenario that fits with a pool-barrage fluvial tufa model. However a better knowl...

A new trench excavated at the southern sector of the Concud Fault provided evidence of three palaeoseismic events dated to ca. 21, 18 and 13–3 ka BP, respectively. The two youngest ones had not been detected in previous studies. The results extend the total recorded palaeoseismic succession for the fault: eleven events since ca. 74 ka BP to the pre...

Environmental magnetic proxies were analyzed in a relatively monotonous, ~25.3m thick alluvial sedimentary sequence drilled in the Añavieja Basin (NE Spain). Results from the core AÑ2 suggest that the concentration dependent magnetic parameters mainly reflect variations in the content of detrital magnetite, sourced in the catchment rocks and soils...

The Olvena area (Sierras Marginales, southern Pyrenees) provides an outstanding example for studying the relationships between tectonics and sedimentation related to fold-and-thrust systems having shallow decollements. Stratigraphic and sedimentological features allow infer i) the relationship between Oligocene-Miocene locally-sourced alluvial fans...

Ground penetrating radar surveys (GPR) present numerous application fields due to its high resolution and depth range depending upon the used central frequency antennas. Both penetration and resolution permits the study at scales between milimetric to decametric range. The evaluation of research objectives permits the choosing of high to low freque...

A complex sedimentary system developed in the Añavieja‒Dévanos Basin (NE Spain) during the Holocene. Alluvial fans spread into a shallow lake that connected downstream with a tufa barrage fluvial system with sparse vegetated areas. Sedimentological model is the most common information extracted from the study of tufa fluvial deposits, but if preser...

The Concud Fault is located at the junction between the Jiloca and Teruel grabens (central-eastern Iberian Chain, Spain). The Late Pleistocene activity of this fault has been well logged from structural and palaeoseismological trench studies, but only scattered data of the Late Pliocene seismic activity exist. The Late Pliocene-Early Pleistocene sy...

In palaeoseismological trench studies, precise correlation of sedimentary units between fault blocks has an unquestionable value for accurately inferring the amounts of coseismic displacement and hence for assessing seismic hazard. A methodology based on laser analysis of particle size and mineralogic composition by X-ray diffraction is proposed in...

During Early, as proposed by the International commission on stratigraphy Pleistocene times, interacting fluvial and aeolian processes constructed wide alluvial plains over an evaporite-dominated Miocene substratum in the central Ebro Basin. An exceptional site where these deposits show faults, folds, diapirs, karst structures and unconformities ha...

An integrated analysis was carried out in a selected quarry of the oldest terrace of the Ebro River, where a wide gravel unit characterized by large-scale cross bedding outcrops. This unit has been interpreted as a lake with marginal deltas. Previous sedimentological studies have pointed out that braided rivers dominated in the area during the Earl...

Alluvial fans and shallow carbonate lakes interfered in the Teruel half-graben during the Late Miocene-Pliocene. Tectonic influence is recorded in alluvial and lacustrine-palustrine successions, with long-term climate changes being recorded in detail in the isotopic signatures of carbonates. Episodes of tectonic activity induced alluvial fan progra...

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In this work we carry out a preliminary paleomagnetic analysis focused in the oldest fluvial terrace (198-220 m) of the Ebro River, in the central sector of the Ebro Basin. We have also conducted a combined analysis of anisotropy of magnetic susceptibility (ASM) and paleocurrent data in the area. The paleomagnetic record shows a clear high temperat...

Terra Nova, 24, 407–416, 2012 Lacustrine sedimentation is very sensitive to climate changes and its cyclicity analysis allows a better quantitation of the time of sedimentation than other methods. Climate and tectonic influence on sedimentation in a synrift basin is interpreted from the spectral analysis of a 49-m-thick series, which includes 88 de...

The central Ebro Basin is an exceptional region for studying karstification through time and under different environmental conditions, as sinkholes have been developing since the Early Pleistocene. Knowledge of active sinkholes is complemented with research on paleosinkholes and contemporary deposits. Sedimentological, mineralogical, geomorphologic...

Meltwater flows emanating from the Pyrenees during the Pleistocene constructed a braided outwash plain in the Ebro Basin and led to the karstification of the Neogene gypsum bedrock. Synsedimentary evaporite dissolution locally increased subsidence rates and generated dolines and collapses that enabled the accumulation and preservation of outwash gr...

Resumen: Las medidas de las propiedades magnéticas estándar como susceptibilidad, remanencia anhisterética y magnetización remanente isotérmica se utilizan en magnetismo ambiental para detectar cambios climáticos. En el caso de la cuenca de Añavieja se ha medido la susceptibilidad magnética en 610 puntos localizados en los sedimentos pleistocenos d...

geophysical survey (using GPR) has been developed in a sector of the Holocene fluvio-lacustrine system in the Añamaza river valley and the results have been contrasted with two new cores. Prospected area includes tufa barriers and pools between them. The integration of the results with nearby outcrops permits the internal structure of the system to...

In this work several examples of karst morphologies and their associated deposits in the T3 terrace level of the Ebro River are described and characterized. The study was carried out from a multiproxy approach (geomorphological, sedimentological, structural and geophysical). Three examples of palaeodolines (some of them synsedimentary) generated wi...

El análisis geométrico de los cambios de las propiedades electromagnéticas en el subsuelo mediante georradar es de amplia aplicación en la caracterización de riesgos kársticos por dolinas en medios de karst aluvial. La identificación de secciones con geometría plano-cóncava es un criterio para la identificación de colapsos o dolinas de subsidencia...

This paper focuses on the clay mineralogy (using XRD, SEM and TEM methods) of the lacustrine “Calizas de Torrente de Cinca” unit that represents the Oligocene-Miocene transition in the central part of the Ebro Basin (NE Spain). Phyllosilicates are mainly detrital although Mg-smectites could have been generated in the lake. Although a temperate, rel...

A complex Holocene system in the central Iberian Range (NE Spain) has been reconstructed on the basis of sediments recovered from cores and in situ observations. Small alluvial fans graded into a wide shallow lacustrine area (Añavieja Lake) that connected downstream with a carbonate fluvial system with associated vegetated zones. The fluvial system...

Karst processes and landforms are very common in the surroundings of Zaragoza (central part of the Ebro Basin, Spain) and related economic losses very important. Karst in this area is associated with the dissolution of the Neogene evaporites and the process is more active in the zones where they are covered by Pleistocene gravels (mantled karst) th...

In this work a detrital (gravels, sands and minor lutites) unit characterised by high scale cross-strata enclosed in Pleistocene braided fluvial gravels is described and interpreted. The studied succession, located in the central area of the Ebro Basin, overly Neogene evaporites. Sedimentological analysis supported by georadar survey, that reveal s...

High porosity carbonate rocks are excellent hydrocarbon reservoirs and aquifers explored and exploited wide world. They accumulate in a wide variety of depositional settings but those related with carbonate marine platforms are the best studied. Among continental settings, fluvial carbonates could be important reservoirs. The primary porosity of fl...

Karstification is a very active process in the central Ebro Basin (NE Spain). In this zone a thick series of evaporites deposited in wide lacustrine systems during the Miocene. Lately in the Quaternary those evaporites were partially eroded and covered by detrital deposits (mainly fluvial). In this context, dissolution of Tertiary beds generates nu...

Presence of dolines in Zaragoza region causes high economic losses. For delimiting dolines a methodology is proposed. This considers the spatial and temporal scale of this phenomenon. Methodology includes: geomorphological mapping, studies of urban damages, of paleodolines, interviews, characteristics of the subsoil and different geophysical prospe...

The sedimentary succession of Gallocanta lake, a closed saline lake located in the Iberian Range (NE Spain), documents two successive lacustrine stages: (1) brackish lake stage and (2) shallow saline lake stage. The saline stage corresponds to the present-day situation in which the lake water properties are mainly controlled by a strongly negative...

Pleistocene fluvial deposits of the Ebro River, in NE Spain, are widely affected by faults, fractures and tilting of beds. Based on the lithological, geometrical and textural features of these deposits, seven architectural elements have been differentiated. Gravel Bars (GB), Gravel-filled Channels (CH), Sheets and Channel-fill Sands (SB), are the m...

The sedimentological and palynological study of the Gallocanta lake sediments, in the NE of Spain, has allowed the Holocene environmental evolution of this lacustrine basin to be established, and several changes in the hydrological balance to be interpreted. The chronology of the sequence is based on new radiocarbon datings and 210Pb radiometric te...

Sedimentological and hydrogeological studies are combined in order to investigate the environmental conditions of the lacustrine sedimentation during the Holocene in Gallocanta Lake in Spain. Six units have been identified in the sedimentary succession, based on sedimentological facies and mineralogy, and three depositional stages have been defined...

Three sedimentary subenvironments, palustrine (GP), marginal lacustrine (GML) and central lacustrine (GCL), were compared regarding water chemistry and microbial activity in order to explain the differences in the carbonate mineralogical composition of the upper sediment layer in Gallocanta Lake, a shallow hypersaline environment in Northeastern Sp...

The Oligocene–Early Miocene rocks cropping out in the northern Ebro Basin (central sector) comprise conglomerates at the margin of the basin gradually passing into sandstones and mudstones towards more central areas. These rocks belong to the Peraltilla and Sariñena Formations and originated in both small monogenic-conglomerate alluvial fans that f...

This paper combines stratigraphic and sedimentological data with XRD, petrographic and SEM techniques in order to investigate the fluvial and alluvial fans that were developed during the Oligocene and the Lower Miocene in the central area of the northern Ebro Basin (Spain), and their respective source areas. The proximal sectors of the coeval depos...

The study focuses on the Holocene sedimentary infill of the Gallocanta lacustrine basin in the Iberian Chain, NE Spain. The Gallocanta lake is a saline wetland with a maximum length of 7.5 km and a maximum width of 2.85 km. The water depth varies significantly, from a maximum depth of 2 m to completely dry. In the central areas (central subenvironm...