Pablo Calvín- PhD
- PostDoc Position at University of Salamanca
Pablo Calvín
- PhD
- PostDoc Position at University of Salamanca
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106
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Introduction
Current institution
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January 2021 - January 2025
November 2018 - present
February 2014 - November 2018
Publications
Publications (106)
The Variscan structure of the Herrera unit (Iberian Chain, NE Spain) is characterized by a system of NNW–SSE-striking, east-verging, foreland-dipping thrusts, generated in a thin-skinned context, whose formation was favoured by the presence of two main detachment levels (Precambrian and Silurian shales). During the formation of the thrust system (f...
The North Pyrenean Zone results from the Late Cretaceous‐Cenozoic inversion of the Mesozoic rift system extending along the Iberia‐Europe plate boundary. The western part of this inverted rift (from the Tardets‐Mauléon basin in the West to the Bigorre basin in the East) is strongly decoupled from the basement along Upper Triassic evaporites and sli...
The anisotropy of magnetic susceptibility (AMS) is a sensitive marker for studying the spatial and temporal evolution of orogens. In weakly deformed rocks deposited in compressive contexts the AMS signal mostly reflects the preferential alignment and deformation of paramagnetic phyllosilicates during early layer parallel shortening (LPS) related to...
Some aspects on the age and correlation of the upper Barremian-lower Aptian stratigraphic units of the NW Maestrat Basin were uncertain prior to this study, due to the differing lithostratigraphy of the marginal Oliete subbasin compared to the more depocentral Galve and Morella subbasins. New magnetostratigraphic, ammonite and sedimentological data...
This paper deals with the detailed analyses of magnetic fabrics, accompanied by stable isotopic composition and microscopic observations, in centimetric and metric scale authigenic carbonate concretions embedded in the Eocene flysch deposits of the Southwestern Pyrenees. Sampling was focused in the carbonate concretions, (in both metric and centime...
Palabras clave: Excursiones geomagnéticas, Cuenca de Villarroya, Plioceno-Pleistoceno. Resumen Porcupine es un corto evento geomagnético de polaridad inversa (edad estimada de 2,737 Ma.) definido cerca de la parte superior del cron de Gauss (dentro de C2An.1n) y sólo descrito en el Sitio IODP U1308 (Atlántico Norte). Por otro lado, la Cuenca de Vil...
En este trabajo se presentan las propiedades magnéticas analizadas en el depósito detrítico de la Cueva del Granito localizada en el valle de Bujaruelo, Zona Surpirenaica. La cueva, con un desarrollo pseudo-horizontal se abre en materiales carbonatados de edad Paleoceno-Eoceno. Dentro, aparecen diversos depósitos internos de origen químico como est...
During the Jurassic, Iberia and western North Africa underwent extensional tectonics conditioned by their position with respect to the African, Eurasian and North American plates and related to the Central and North Atlantic opening and westward expansion of the Tethys. In Iberia, the Jurassic is characterized by the presence of wide shallow marine...
Previous works developed by our research group have shown that the Jurassic rocks of the Central high Atlas (CHA) have recorded a Cretaceous widespread remagnetization. In this chapter, a high resolution paleomagnetic study on 424 new paleomagnetic sites in Mesozoic units of CHA is presented. This work provides new information about the Cretaceous...
This chapter presents the results of numerous rock experiments carried out on Jurassic marine carbonates and red beds from the Central High Atlas, which have been affected by a regional remagnetization related to burial. As in other sedimentary rocks affected by chemical remagnetizations, the analyzed samples show a characteristic magnetic fingerpr...
From the application of the magnetic techniques (Anisotropy of Magnetic Susceptibility and paleomagnetism) it can be seen that to determine the age (and origin) of structures in the Moroccan Central High Atlas is not straightforward from geometrical features only and that similar structures can have different origins, or that the two limbs of a par...
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 so-called Henkel's plot (1976) allows relating density and magnetic susceptibility of rocks. In this work we focused on three paramagnetic Pyrenean granites from the Mont Louis-Andorra, Maladeta and Marimanha granitic plutons. In total, 128 sites with 310 density measurements and > 2600 susceptibility readings cover the main range of variabilit...
This work characterizes for the first time the 500–700 m-thick uppermost Cretaceous continental sedimentary succession of the Allueva Fm recorded in the northeastern margin of the Iberian basin, in the Montalbán subbasin (Maestrazgo domain, Spain). The middle-upper Campanian age of this unit constrained here by new paleomagnetic and biostratigraphi...
![(A) European Variscan belt (Modified after Franke [96]); CZ-Cantabrian...](publication/361216117/figure/fig1/AS:11431281431933899@1746826036583/A-European-Variscan-belt-Modified-after-Franke-96-CZ-Cantabrian-Zone-WALZ-West_Q320.jpg)
In this work we establish reliable correlations between density and magnetic susceptibility in three paramagnetic granites from the Pyrenees. In total, 128 sites (310 density measurements and >2600 susceptibility ones) were studied in the Mont Louis-Andorra, Maladeta and Marimanha granitic plutons covering the main range of variability of magnetic...
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...
En el subsuelo del barrio de La Almozara (Zaragoza) persisten residuos de la tostación de sulfuros de una antigua planta industrial que finalizó su actividad en la década de 1970. Los residuos generados no fueron retirados y es habitual su aparición en obras y en zonas de parque del barrio. Su aparición en superficie produce la dispersión eólica y...
El barrio de La Almozara (Zaragoza) nació al amparo del desarrollo de la Industrial Química de Zaragoza. Una de las actividades de esta empresa era la tostación de piritas para la obtención de ácido sulfúrico. Durante casi un siglo de actividad, los residuos producidos fueron utilizados para recrecer motas y elevar topográficamente La Almozara que...
The Eastern Galicia Magnetic Anomaly is the best studied anomaly of the Central Iberian Arc. This is due to its location, on the Lugo‐Sanabria gneiss dome, and to the fact that its source rocks crop out in the Xistral Tectonic Window. Multiple studies of this anomaly have been carried out, but still, new results keep on shedding light on its unders...
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...
Pyrite roasting wastes coming from a former industry closed in 1979 are still present at the subsoil of La Almozara neighborhood (Zaragoza, Spain). These granular wastes are mainly composed of Fe-and Fe-Ti-oxides, also having high Tl, As, Mo, Cu, Sb, Ag, Pb, and Be content that far exceed the generic reference levels. When these waste materials int...
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...
The Small Circle (SC) tools analyse the stereographic tracks (small circles) followed by the palaeomagnetic vectors during folding processes. Working with interfolding and synfolding remagnetizations, the Small Circle Intersection (SCI) method allows finding the best solution of grouping that should correspond with the remagnetization direction. On...
Lightning impacts on forests and trees are still understudied from a tree-ring perspective. Lighting causes direct and indirect damages on forests and trees. Trees struck by lightning can show a growth reduction and lightning storms also trigger wildfires in seasonally dry areas such as Mediterranean mountains. Here we combined dendroecological and...
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...
The Atlas system is an ENE-WSW intracontinental chain that extends from Morocco to Tunisia. It is the result of the Cenozoic inversion of a set of intraplate extensional basins that started its development during the Triassic and continued during the Jurassic. The Central High Atlas (CHA) is located at the Moroccan part of the Atlas System, charact...
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...
Resumen: La interacción de los fluidos con las rocas, tanto ígneas como metamórficas o sedimentarias, es responsable de numerosos procesos físico-químicos relacionados, por ejemplo, con transformaciones minerales, concentración de determinados elementos, remagnetizaciones, incrementos de temperatura y gradiente térmico, migración y maduración de hi...
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...
The Atlas system is an intracontinental inverted basin located in North Africa. After being subjected to the extensional stage in the Mesozoic, the basin was inverted during the Cenozoic due to the convergence between Africa and Europe. The Central High Atlas is located in the Moroccan Atlas and it is characterized by thick sequences of Jurassic ca...
The Atlas System comprises a set of intraplate basins inverted during the Cenozoic as a consequence of the Africa-Iberia-Eurasia convergence. These basins were developed during the Mesozoic in two rifting stages (Triassic and Early Jurassic), influenced both by the opening of the Atlantic and the evolution of the Tethys. The study area is located i...
Of the several factors involved in the development of magnetic fabrics in fault zones at shallow crustal levels, lithology and deformation intensity have probably the most important conse- quences for the reconstruction of their kinematic history. The basement-involved Cenozoic thrusts in the Demanda Massif (N Spain) provide the opportunity for tes...
Positive tectonic inversion of sedimentary basins has been recognized as one of the primary mechanisms of mountain building and intraplate deformation. Reconstructing the tectonic history of basins is relatively easy for the inversion stage but becomes more difficult for the basinal stage, especially when strong deformation involving cleavage devel...
Magnetic properties of sedimentary rocks have been commonly exploited to determine the tectonic and chemical evolution of sedimentary basins. We here propose the use of the anisotropy of the anhysteretic remanent magnetization (ARM) to infer the orientation of magnetite grains formed during remagnetization stages, and hence to obtain the tectonic r...
Magnetic fabrics are usually studied to unravel the evolution of sedimentary basins, mainly focusing the attention in paramagnetic minerals. However, since basins are sometimes affected by burial-related chemical remagnetizations, magnetic fabrics can also be carried by authigenic ferromagnetic minerals related to remagnetization processes. Consequ...
The Santo Domingo Anticline (External Sierras, Southern Pyrenees) is a key structure of the Pyrenees separating the Jaca piggyback basin from the Ebro foreland basin. Its geometry has been interpreted both as a detachment fold and as a hangingwall anticline associated with an underlying thrust. In this paper, we present the results from a gravity s...
El embalse de Mularroya (más de 100 hm3 de capacidad), situado sobre el cauce del río Grío, uno
de los afluentes del Jalón (afluente a su vez del Ebro por su margen derecha) es una obra en avanzado estado
de construcción. Desde la fase de estudios previos (mediados de los años 90) hasta la actualidad, se han constatado problemas geológicos que pone...
A paleomagnetic and magnetic fabric study is performed in Upper Jurassic gabbros of the Central High Atlas (Morocco). These gabbros were emplaced in the core of pre-existing structures developed during the extensional stage and linked to basement faults. These structures were reactivated as anticlines during the Cenozoic compressional inversion.
Ga...
The Small Circle (SC) methods are founded upon two main starting hypotheses: (i) the analyzed sites were remagnetized contemporarily, acquiring the same paleomagnetic direction. (ii) The deviation of the acquired paleomagnetic signal from its original direction is only due to tilting around the bedding strike and therefore the remagnetization direc...
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...
A useful tool to calculate remagnetization directions and/or to calculate the attitude of the bedding at the remagnetization acquisition time. A difference of incremental fold test, this methods can be used in asymmetric structures
Remagnetizations are common in intraplate basins. When remagnetizations occur at an intermediate stage between different tectonic processes, they can be used for paleo-geometrical reconstructions and relative dating of different structures. This has a particular interest in geological frameworks where other geological time markers are absent. In or...
A paleomagnetic study has been carried out in the boundary between the Folded Middle Atlas and the Tabular Middle Atlas, around Skoura and Tighboula synclines and Boulemane anticline. The goal of this work is to test the existence of a remagnetization affecting the sedimentary rocks in this area. For this purpose different stability tests were done...
Resumen: La Rama Aragonesa de la Cordillera Ibérica está constituida por dos alineaciones de materiales paleozoicos separadas por la cuenca de Calatayud. En el sector norte se encuentra una de las estructuras más importantes de la orogenia Varisca en la Cordillera Ibérica: la falla de Datos, que puede distinguirse únicamente en sus sectores más sep...
Abstract: Since the last 40 years the analysis of remagnetized carbonates is under debate, by studying their magnetic properties and by using electronic microscopy (SEM/TEM). Results obtained from the first analyses allowed to infer that remagnetization is carried generally by nanometric magnetite and generated during the diagenesis, therefore it c...
Las facies continentales de la Cuenca de Tremp contienen uno de los abundantes registros con vertebrados
continentales del final del Cretácico en Europa. Esta área de los Pirineos es un lugar excepcional para estudiar la extinción de los vertebrados continentales en el límite Cretácico-Paleógeno (K-Pg) al ser uno de los pocos lugares de Europa con...
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...
In this work we present the results of the application of Anisotropy of Magnetic Susceptibility (AMS) to structural analysis in a sector of the Central High Atlas (Morocco). The studied sedimentary sequences comprise marly limestones and calcareous marls, having medium to high susceptibility values in most sites. The obtained magnetic fabrics (aver...
We introduce the first map of density data in Northeastern Spain which can help in the interpretation of gravimetric surveying. The background map is a simplified version of the Geode continuous geological cartography (scale 1:200.000) of the Iberian Range and Ebro basin. These maps are synthetic and homogeneous maps based on previous 1:50,000 scal...
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...
This study is based on the comparison of structural analysis and AMS data of Río Grío Fault, associated with the Datos Fault System, in the Iberian Chain (Northeastern Iberian Plate, Spain). The Río Grío Fault, with NW-SE strike, has a tectonic evolution of probably Mesozoic extension and Tertiary transpressive dextral movement, and it is character...
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...
Geological structures can be interpreted in different ways as a function of the available data, and several geometric interpretations may have an equal validity. That is the case of Santo Domingo Anticline, the
westernmost structure of the External Sierras and the South Pyrenean sole thrust. The outcroping structure is well known from field data ;...
The High Atlas is an ENE-WSW intracontinental chain generated during the Cenozoic as the result of the inversion of Mesozoic basins (Mattauer et al, 1977). The extensional stage is characterized by two rifting episodes during the Triassic and Lias-Dogger, both with an important associated igneous activity. Middle Jurassic alkali magmatism igneous r...
Two important reverse dipolar magnetic anomalies in the Iberian Chain (Spain) are located over Permian igneous rocks. A detailed study of one of them, the Loscos magnetic anomaly, where the geological structure is well constrained, reveals that the source of the anomaly must be a reverse remanent magnetisation carried by igneous rocks, acquired dur...
In this work we present an analysis of the applicability of ground penetrating radar (GPR) to karstic hazard evaluation in urban areas by means of several case studies. The main objective is to characterize the origin of pathologies in buildings and other facilities, and of subsidence processes, and to identify their causative phenomena in the subs...
y-gRaph, a user-friendly spreadsheet for reconstructing paleostress fields by means of the y-R diagram is presented. The y-R diagram is based on Bott´s equation and translates the parameters of the stress ellipsoid to a XY plot representing the maximum horizontal stress orientation (σy) and the stress ratio (R), compatible with a given set of stria...
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...
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Dynamically scaled brittle/ductile analogue models have been per-formed. Experiments consisted of the compression of a sand-pack with a basal ductile layer of silicone putty acting as a décollement level. The bound-ary conditions were chosen to analyze the influence of the lateral migration of the ductile level and the strain rate on the deformatio...
