I. Gil-Peña

I. Gil-Peña
Instituto Geológico y Minero de España | IGME

About

81
Publications
17,015
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543
Citations
Citations since 2016
7 Research Items
313 Citations
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050
Additional affiliations
December 1993 - present
Instituto Geológico y Minero de España
Position
  • Jefa de Servicio OTRI
June 1988 - December 1993
University of Zaragoza
Position
  • Colaboradora

Publications

Publications (81)
Article
During the Triassic, Iberia and western North Africa displayed a unique situation in relation with the Central and North Atlantic opening and westward expansion of the Tethys. Unravelling the stretching direction in Triassic deposits of the studied area can help in our understanding of this scenario. The tectonic setting is characterized by localiz...
Conference Paper
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During the Triassic, Iberia and nearby areas of the North-African systems constituted the transition zone between the North Atlantic Ocean opening and the westernmost Tethyan realm. Unravelling the stretching direction (i.e. primary magnetic lineation) during this period can help to understand the tectonic setting of the studied area. In this work,...
Article
Full-text available
Magnetic properties of rocks can be useful for determining paleoenvironmental changes. A dramatic climate change that occurred in the Paleocene-Eocene Thermal Maximum (PETM) modified the environment and, hence, the magnetic properties recorded in the sediments. New paleomagnetic data from marine records of the PETM in the Southern Pyrenean zone dis...
Article
Magnetic fabric allows to unravel the petrofabric of sedimentary rocks and to assess their deformational history. The use of this technique, in addition to classical structural field observations in the limbs of seven asymmetric folds in the Pyrenees, helps to determine the differences of internal deformation as well as the folding kinematics. Thre...
Conference Paper
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...
Article
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...
Article
Full-text available
This work investigates how anisotropy of magnetic susceptibility (AMS) recorded the strain related to the Early Cretaceous extensional processes in synrift sediments of the Maestrat basin (eastern Spain). Forty-two sites, distributed throughout the Lower Cretaceous sequence with dominant gentle dips, were sampled. Minerals contributing to the AMS a...
Article
Anisotropy of magnetic susceptibility (AMS) techniques are applied to Permo-Triassic red beds from the Castilian Branch (Iberian Range, NE Spain) that were deposited in an extensional basin inverted during Cenozoic times. The main goal of this work is to characterize the tectonic evolution of the basinal stage by differentiating synsedimentary to e...
Conference Paper
Full-text available
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...
Article
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...
Article
Full-text available
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...
Article
The present work provides a combined structural and paleothermal (fluid inclusions, illite content in mixed layers illite–smectite, Kübler index and vitrinite reflectance) investigation of the Alpine cleavage domain affecting the western South Pyrenean Zone (Central Pyrenees). Integration of structural and paleothermal data allows us (i) to determi...
Conference Paper
Full-text available
Anisotropy of Magnetic Susceptibility (AMS) is known to be related to the prevailing strain ellipsoid during sedimentation. However, even in weakly deformed sediments, this primary fabric can be modified by subsequent deformational stages. This work is focused in the study of AMS registered in marls and marly limestones from a strongly subsiding ba...
Article
Full-text available
We apply AMS techniques in Triassic red beds from the Castilian Branch (Iberian Range, NE Spain), a tectonically inverted basin (during Tertiary) where no penetrative structures associated to compression were originated. Our goal is to differentiate magnetic fabrics developed during the exten-sional stage and the ones modified during compression. I...
Conference Paper
Full-text available
The analysis of recent volcanic systems can have handicaps in their analysis when the most recent eruptions hide part of the geological historythe geomorphological signals does not have univocal interpretations and when the abrupt topography linked to recent volcanic systems restricts the available places to perform detailed analyses. The study of...
Article
Full-text available
The present study provides new magnetic and microstructural data for the Eaux-Chaudes granodioritic massif (Western Axial Zone, Pyrenees) and contributes to the understanding of its geometry, internal structure and emplacement mechanism. Moreover, the geological cross-sections and field data allow to reconstruct the evolution of the whole area from...
Conference Paper
Full-text available
Deception Island shows a volcanism related to passive subduction of the Phoenix Plate and roll-back at the South Shetlands Trench in the present. The rocks of Deception Island can be subdivided into two main groups: the pre-(and syn-) caldera unit and the post-caldera unit. The pre-caldera unit includes the oldest rocks exposed on the island and is...
Conference Paper
Full-text available
Paleomagnetic techniques are useful to detect tectonic deformations that might overprint the primary magnetization. When it is possible to bracket the age of a remagnetization in an inverted basin after deposition and before its compressional stage, paleomagnetic data can be used to determine the geometry of the basin at the moment of acquisition o...
Conference Paper
Full-text available
A relationship between the orientation of the magnetic susceptibility ellipsoid and the strain ellipsoid has been demonstrated by using the anisotropy of magnetic susceptibility (AMS) in sedimentary rocks. Studies also interpret an early development of the magnetic fabric, which registers the stress pattern acting during deposition. But this primar...
Conference Paper
Full-text available
La isla Decepción está situada en la prolongación del eje de expansión de la Cuenca de Bransfield, que ha sido interpretada como una cuenca de trasarco asociada al arco volcánico del archipiélago de las Shetland del Sur. Se trata de la parte superior de un volcán en escudo constituido por lavas basálticas y aglomerados de piroclastos. Las rocas est...
Conference Paper
Full-text available
In Deception Island (South Shetland Islands), basaltic lava flows and pyroclastic agglomerates with ages ranging from 350 ky to present have been sampled in 21 sites (411 samples). Anisotropy of Magnetic Susceptibility (AMS) along the different sampled units allows to describe three main groups of fabric patterns: i) oblate fabrics with magnetic fo...
Chapter
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In addition to the mapping, a comprehensive stratigraphic study of outcropping Late Cretaceous, Paleocene, and Early Eocene series was carried out. This study was supported by analyses of the larger foraminifera faunas included in these series as dating and correlation tools and by magnetostratigraphic studies. Special attention was paid to the Pal...
Article
Full-text available
Deception Island shows the most recent active volcanism, evidence of several eruptions since the late 18th century, and well-known eruptions in 1967, 1969, and 1970 at the western end of the volcanic ridge of the Bransfield Trough, between the South Shetland Islands and the Antarctic Peninsula. The recent tectonic activity of the Bransfield Trough...
Article
The Castan ̃ar Cave (central western Spain) formed in mixed carbonate–siliciclastic rocks of Neoproterozoic age. The host rock is finely bedded and shows a complex network of folds and fractures, with a prevalent N150E strike. This structure controlled the development and the maze pattern of the cave, as well as its main water routes. The cave form...
Article
This paper presents new geochronological, geochemical and isotopic data for Late Ordovician magmatism (455 ± 2 Ma) from the Variscan massifs in the northeastern Iberian Peninsula. This magmatism is mainly composed of aluminous and metaluminous plutonic rocks and a sequence of calc-alkaline ignimbrites and epiclastic volcanic rocks, which were defor...
Article
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This work deals with the magnetic fabric (AMS technique) of different lithotypes related to quaternary volcanism of Deception Island (South Shetland Islands). The studied rocks include lava flows from basaltic to basaltic-andesitic composition, mafic dykes and several types of pyroclastic deposits. By combining the analysis of parametric aspects of...
Conference Paper
We report Anisotropy of the Magnetic Susceptibility results (AMS) from Plio-Quaternary lava flows exposed on Deception Island. It is located in the Bransfield Strait marginal basin that separates the South Shetland Islands from the Antarctic Peninsula and was generated by the collapse of the central part of a stratovolcano. The magnetic fabric of t...
Article
Full-text available
Muchos de los estudios realizados en los últimos años indican que la sensación de invisibilidad y discriminación que sentimos las mujeres dedicadas a la ciencia, y específicamente a la Geología, no es una mera percepción subjetiva, sino que las cifras están ahí corroborando estas sensaciones. Los datos de distintos organismos y elaborados por disti...
Article
Full-text available
The structural and magnetic fabric study of the Marimanha granite, Axial Zone of the Pyrenees, provides new data to characterize the zonation and the internal structure of the pluton. The Marimanha granite intrudes Cambro–Ordovician clastic rocks and Silurian–Devonian limestones and slates. The zonation of the low field mag-netic susceptibility, co...
Conference Paper
Full-text available
The abundant paleomagnetic and AMS information in the Pyrenees (and their foreland basins; Aquitaine and Ebro) motivated the development of databases in 2003 in the frame of an INTERREG III project (Pyrenean Network, CTP). In this paper we describe the different databases, the methodology used (sources, layers, display) and future developments. The...
Conference Paper
Full-text available
The abundant paleomagnetic and AMS information in the Pyrenees (and their foreland basins; Aquitaine and Ebro) motivated the development of databases in 2003 in the frame of an INTERREG III project (Pyrenean Network, CTP). In this paper we describe the different databases, the methodology used (sources, layers, display) and future developments. The...
Article
Magnetostratigraphy has been extensively applied in the southern Pyrenees (Spain). At the moment there are more than 50 km of series most of them in continental and transitional facies and only a few in marine sediments. Seeing that Lutetian age has received very little attention and Ypresian - Lutetian transit in marine series has been rarely stud...
Article
Full-text available
In this work we apply the study of fracturing to the characterisation of Mesozoic extensional processes in the easternmost part of the Iberian Basin (Maestrazgo basin). Faults at the macroestructural scale (many of them related with Early Cretaceous basin formation) show dominant N-S to NE-SW and E-W to NW-SE orientations. These main orientations a...
Conference Paper
Full-text available
http://www.ub.edu/paleomag/magiber4_Vigo.htm
Article
Full-text available
The structural and magnetic fabric study of the Marimanha granite (Axial zone of the Pyrenees, Catalonia), provides new data to characterize the zonation and the internal structure of the pluton. The Marimanha granite intrudes Cambro-Devonian metasediments of the Axial zone of the Pyrenees. The zonation of low field magnetic susceptibility is consi...
Conference Paper
Full-text available
The structural and magnetic fabric study of the Marimanha granite, Axial Zone of the Pyrenees provides new data to characterize the zonation and the internal structure of the pluton. The Marimanha granite intrudes Cambro-Devonian metasediments of the Axial Zone of the Pyrenees. The zonation of the low field magnetic susceptibility, consistent with...
Chapter
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Conference Paper
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The overall sedimentary architecture of the Ebro delta is been studied. It includes: (i) the Holocene high-resolution sequence stratigraphy, analysed in terms of relative mean sea-level variation and (ii) the sin/post- sedimentary deformation processes. The sea-level variations are assumed as the sum of sediment supply, eustatism and subsidence rat...
Chapter
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A general description is given of the sedimentary and tectonic history affecting the Variscan Pyrenees. Special attention is devoted to the main Alpine structural units of the Pyrenean chain. Geodynamic processes, such as the Variscan deformation, the relative lateral movement between the European and Iberian plates and the Mesozoic crustal thinnin...
Chapter
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A synthetic stratigraphic succession of the upper Silurian Llessui Formation is established according to partial sections and conodont sampling. The lower part of the formation is considered Ludlow, while the uppermost Přídolí conodont O. e. detortus Zone is recognised at the top. Above, the shales, with some limestones of the Aneto Formation, rang...
Chapter
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The lower Palaeozoic stratigraphic succession of the Pyrenees is described. A metamorphic lowermost part lies above metagranitic orthogneisses, which are interpreted as a Precambrian basement and/or as intrusive igneous rocks. Precambrian? to Lower Ordovician slates, greywackes, sandstones and limestones form a succession affected by metamorphism a...
Article
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The main structural characteristic in the Pallassos Dome consists of the superposition of two non-coaxial synschistose Hercynian folding systems with associated thrusts. Subsequent late Hercynian and/or Alpine deformations are coaxial with the second fold system. The contact between the Pallassos Dome and the Durro-Llessui unit shows a subtractive...
Article
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The South-Pyrenean basin is a good Place to study the relationship between orogenic growth and foreland basin evolution. The good exposure of the synorogenic sedimentary sequence, due to the present erosion level, its sparse vegetation cover, and the relative small dimensions of the basin, allows an outcrop based accurate study of the basin archite...
Article
Full-text available
The Upper Ordovician stratigraphic sequence from the Pyrenean Axial Zone starts at a basal conglomerate, known as the Rabassa Fm in the Central and Eastern Pyrenees, that overlays unconformably an undated siliciclastic sequence. The vertical stacked facies of that sequence include, over the basal conglomerate layer, greywackes, siltstones and clays...
Article
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The Upper Ordovician sedimentary record of the western Orri dome (central Pyrenees), shows a thin succession including a thinning upwards sequence of matrix supported conglomerates in the lower part (Rabassa Fm.), fine-grained sandy and silty slates (Cava Fm.), two or three shoaling upward sequences of crinoidal limestones (Estana Fm.) and finally...