Alejandro Robador

Alejandro Robador
Instituto Geológico y Minero de España | IGME · Department of Geosciences Research and Prospective

PhD

About

52
Publications
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620
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Publications

Publications (52)
Article
The Bay of Biscay-Pyrenean rift system is a world-class example of an inverted hyperextended rift. However, tectonic questions such as the linkage of the extensional system, the magnitude of crustal extension, the interpretation of the syn-rift sequences and the amount of shortening during tectonic inversion remain controversial. This paper present...
Article
Full-text available
A taxonomic study of the Paleocene larger foraminifera from the Pyrenean basin has led to the description of sixty taxa including two new species: Alveolina korresensis and Valvulineria bacetai. In this work, we present a chronostratigraphic recalibration of the Paleocene Shallow Benthic Zones SBZ 1 to SBZ 4 based on correlation with calcareous nan...
Conference Paper
Full-text available
A regional South Portuguese Zone (SPZ) mapping and stratigraphic program in SW Iberia is presented. It is being developed by LNEG and IGME and financed by the GEO_FPI Project (www.geo-fpi.eu). The SPZ is the southwesternmost geotectonic unit of the Variscan Orogeny in Iberia. The following domains are considered: Pulo do Lobo (early Frasnian -late...
Chapter
During the Late Jurassic and Early Cretaceous, Iberia experienced extensional and transtensional stresses leading to a complex rifting time interval. Africa–America–Europe relative motions determined the definition of the Iberian plate boundaries and the generation of rifted sedimentary basins and sub-basins along its continental margins and in the...
Poster
Full-text available
A review of the Hyperextensional model in the Pyrenees highlighting the discrepancies among different proposals, in particular the interpretation of the polarity of the main extensional detachment(s) and the mechanical role of the exhumed mantle during convergence.
Article
Critical gravity and magnetic data suggest the presence of a continuous zigzag exhumed mantle body inside the attenuated crust of the north Iberia continental margin. We propose that this body greatly conditioned the structural domains of the Cantabrian–Pyrenean fold-and-thrust belt during their evolution from hyperextension in Early Cretaceous tim...
Chapter
Critical gravity and magnetic data suggest the presence of a continuous zigzag exhumed mantle body inside the attenuated crust of the North-Iberia continental margin. We propose that this body highly conditioned the structural domains of the Cantabrian-Pyrenean fold-and-thrust belt during their evolution from hyperextension in Early Cretaceous time...
Article
Full-text available
A continuous high-density body is regarded as exhumed mantle rocks beneath the Basque-Cantabrian Basin extending along the Northern Pyrenees • Pedreira et al. (2018) doubts our 3-D gravity model, the view of the high-density body as exhumed mantle, and the proposed geodynamic model • We defend point by point our model that offers important keys t...
Article
Full-text available
Recent models support the view that the Pyrenees were formed after the inversion of a previously highly extended continental crust which included exhumed upper mantle rocks. Mantle rocks remain near to the surface after compression and mountain building, covered by the latest Cretaceous to Paleogene sequences. 3D lithospheric-scale gravity inversio...
Chapter
Full-text available
The geological map is a scientific document which describes the geological configuration of an specific area. The information represented in the geological map allows to the visualization of the tridimensional volumes of the geological objects. This is the only map of the natural realm that permits such an analysis, which makes it a predictive tool...
Article
The La Pardina Formation is a siliciclastic-dominated unit up to 26 m thick intercalated within a 300 m thick Danian–lower Ilerdian succession of shallow marine carbonates in the southern Pyrenees. The unit is composed of four interdigitated facies, three of them of a coarse-grained siliciclastic character (Sf1, Sf2, Sf3), and the fourth one compos...
Book
Full-text available
56 million years ago, a sharp rise in the carbon content of the atmosphere exerted a profound impact on the Earth's environment. The temperature of the surface of the oceans rise between 5º and 8ºC, vast areas of the planet experimented torrential rains, biological evolution of living organisms was strongly modified and the Oceans became acidified....
Conference Paper
Full-text available
The Geological Survey of Spain (IGME) in cooperation with the National Park Authorities has started the edition of a new tourist guidebook series: the National Park Geological Guidebooks. This new series intends to answer the growing social demand of geological guides in natural protected areas. The geological guide of the Ordesa and Monte Perdido...
Book
Full-text available
The geological guide of Ordesa and Monte Perdido National Park (Spain), is a tool to understand the geological processes that shape the landscape of the National Park. Intended to attach a wide range of readers, includes a full set of graphic explanations. The most representative geological itineraries in the Park area, and a simplified geological...
Book
Full-text available
This is the french version of the geological guide of Ordesa and Monte Perdido National Park (Spain). This book is a tool to understand the geological processes that shape the landscape of the National Park. Intended to attach a wide range of readers, includes a full set of graphic explanations. The most representative geological itineraries in the...
Data
Ce guide fournit au lecteur des cartes topographiques et géologiques simplifiées pour une meilleure compréhension dans le dos de couverture. CHAPITRE I: LA CHAÎNE P 10 Dans la première partie on introduit le lecteur aux concepts de base de la géologie à travers le contexte géologique des Pyrénées. De cette manière, on comprendra l'origine des roche...
Book
Full-text available
Geological map 1.50.000, 212 sheet, located in the South-central Pyrenees. Includes a 94 pp. memoir. The mapped area encompases the south-western tip of the Cotiella thrust sheet emplaced over its relative autochtonous: the Gavanie unit. In this later, the transitional area between Lower Eocene platform and talus facies is represented.
Article
Full-text available
This paper focuses on the geometry of the Utrillas (Albian) basal unconformity in the south of Cantabria. It is a sharp angular unconformity, accounting for up to 1300 m of eroded sediments. In map view the unconformity erodes older sedimentary rocks westwards, however, its structural features show a prominent NE-SW to N-S trend, where the substrat...
Chapter
Full-text available
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
The Ilerdian Stage was created by Hottinger and Schaub in 1960 to accommodate a significant phase in the evolution of larger foraminifera not recorded in the northern European basins, and has since been adopted by most researchers working on shallow marine early Paleogene deposits of the Tethys domain. One of the defining criteria of the stage is a...
Article
Full-text available
The Paleocene-Eocene thermal maximun (PETM) had earlier been documented in basinal and continental settings of the Pyrenean basin clastic units. In this work new data are added from comparatively less well-known platform interior successions outcropping at the Ordesa and Monte Perdido National Park. There, the PETM is recorded by comparatively thin...
Chapter
Palaeocene depositional sequences and their constituent systems tracts (ST) have been recognized and studied in the deep-water interplate Basque basin and in the adjacent north Iberian shelf (western Pyrenees, north Spain). In addition, re-examination of the Palaeocene of the north Pyrenean basin strongly suggests that a similar set of sequences al...
Article
Full-text available
Extensive Paleocene carbonate platform deposits in the South western Pyrenees evolve laterally towards the central Pyrenees into transitional and non-marine red beds, known as the Tremp Fm or Tremp Group, which also includes upper Cretaceous and lower Eocene deposits. In the South Pyrenean Central Unit (SPCU), the middle part of the Tremp Fm show a...
Article
Full-text available
This paper focuses in the sedimentary history during the upper Aptian of the distensive Organyá Basin, now preserved in the Boixóls thrust. The upper Aptian succession has been divided in seven parasequences bounded by flooding surfaces, which allow us to interpret them as genetic stratigraphic sequences. One of these surfaces is a hardground recog...
Article
The Geologic Sheet 3169-14 (Castaño Viejo) is the first sheet of the new Geological Map of the Argentine at 1:100.000 escale. This sheet is located in the western part of San Juan Province, in the Calingasta Department. The study area is located at the morphostructural unit known as Cordillera Frontal (Groeber, 1938), although part of the Rodeo-Usp...
Article
Full-text available
An important stratigrafhic break has been recognized in the Paleocene of Navarra and the Basque Country, which is recorded, with different features, both in platform and basinal settings. It has been correlated thorugh paleontological dating with the majar sea-Ievel drop of the Paleocene and is therefore ascribed to eustasy. In many instan ces, thi...
Chapter
Full-text available
This chapter is a complete review of the stratigraphic architecture of the Paleocene series in the south pyrenean realm, including the basque-cantabrian domain. A sequence stratigraphy framework is also provided.

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Projects (2)
Project
Most continent-continent collisional zones were built upon former rift systems. In these regions, strength variations inherited from the former rifting processes weakened the lithosphere, making it susceptible to deformation in response to edge forces. Similarly, the geometry of the precursor rift system has a direct impact on active deformation patterns and seismicity distribution in present-day collisional zones. However, the incorporation of rifted domains into collisional orogens is still poorly understood and a number of questions remain open, for instance: (i) how the pre-shortening margin architecture controls the onset of subduction, (ii) what is the role of shallow mantle domains during contractive reactivation, or (iii) how precursor rift-related transfer zones interact with the fold-and-thrust belt. In fact, inherited transfer zones are of capital importance for geological hazard assessment in active mountain belts, since they are often the locus of seismicity and/or abrupt changes in relief. The REViSE-Betics project focuses on these questions in the Betic Cordillera, where remnants of the Mesozoic rifted system were incorporated in the Cenozoic collisional orogen. The basic hypothesis to be tested concerns the mode by which heterogeneities in rifted continental margins control the subsequent tectonic evolution and seismicity distribution, thus how the configuration of conjugate margins controlled the onset of subduction and continental collision dynamics. Research results are expected to contribute to actions on natural and hazard energy by providing new information on stress directions, relative stress magnitudes and topographic response –fundamental to understand the active crustal deformation and seismicity–, and it will advance our knowledge on potential geologic reservoirs for carbon dioxide capture and storage because salt may also provide closure structures for this purpose.