Antonio Barnolas

• Retired at Instituto Geológico y Minero de España

We report the structural geometry and facies architecture of a small diapir-related carbonate-dominated basin from the Jurassic rift of the Moroccan High Atlas. The Azag minibasin is a lozenge-shaped depocenter completely enclosed by tectonic boundaries that we interpret as welds after former salt anticlines or salt walls. The exposed ca. 3000 m-th...

The late Pliensbachian–early Toarcian (Early Jurassic) was a time of major environmental changes that culminated with the Early Toarcian Oceanic Anoxic Event (T-OAE, ca. ~183 Ma). This period is marked by significant disturbances in the carbon cycle and rapid climatic changes. To improve the understanding of the expression of these events in wester...

This chapter deals with the two Alpine Foreland Basins of the Iberian Peninsula. The first part of the chapter refers to the South Pyrenean Foreland Basin and its westward prolongation, the Basque–Cantabrian Paleogene Basin. It includes: (1) the introductory concepts about the basin extend, margins, sedimentary systems, basin evolution and segmenta...

The stratigraphic distribution of larger benthic foraminifera and other microfossils, as analysed in thin-sections, has been investigated in three stratigraphic sections from the island of Mallorca (Son Maina, S’Heretat and Cuevas de Artà). These stratigraphic sections represent deposition in a Lower Jurassic shallow-water carbonate platform succes...

The Sr-isotope stratigraphy (SIS) method has been applied to a Middle Jurassic section of Mallorca (Coves d’Artà) to improve its age control. The Middle Jurassic stratigraphy of this section, more than 220 m thick, is unique in the Mallorca island due to the existence of slope mudstones (Sa Talaia mudstones) evolving upward to a shallow oolitic pla...

The record of brachiopods in the Lower Toarcian of the Balearic Islands is described after a reassessment of previous works and new samplings in the Tramuntana Range of Mallorca. The recognized species have been assimilated to the assemblages described in the Iberian Range in the Tenuicostatum and Serpentinum biozones. Moreover, a detailed comparis...

Despite the large number of magnetostratigraphic studies in the South Pyrenean Basin aiming to calibrate the basin chronostratigraphy and the biostratigraphic scales, the South Eastern Jaca Basin remains unexplored from this perspective, and its relation with the Ainsa Basin is not fully understood. In this work we contribute with new magnetostrati...

An integrated study including magnetostratigraphy, larger benthic foraminifera and calcareous nannofossil biostratigraphy is presented herein. This work was performed in shallow marine siliciclastics rich in larger foraminifera, around the Ypresian/Lutetian boundary in the Ésera valley (South-Central Pyrenees). Although the calcareous nannofossil c...

Los nuevos resultados obtenidos en estudios recientes del Sinemuriense-Pliensbachiense inferior (Formación Sóller) en la isla de Mallorca, aconsejan modificar su esquema litoestratigráfico. La nueva propuesta litoestratigráfica para este intervalo elimina la Formación Sóller y eleva sus tres miembros, anteriormente definidos como miembros Es Barrac...

The ~125 m thick lower to lowermost upper Sinemurian peritidal to shallow subtidal platform carbonates in the Llevant Mountains of Mallorca (Spain) have been analysed from four stratigraphic sections, to provide new data on the hierarchical stacking pattern of high-frequency depositional sequences. Due to the fact that in shallow water environments...

The variety of depositional facies of a Lower Jurassic carbonate platform has been investigated on the island of Mallorca along a transect comprising six stratigraphic profiles. Twenty-nine facies and sub-facies have been recognized, grouped into seven facies associations, ranging in depositional environment from supratidal/terrestrial and peritida...

In this paper we present new magnetostratigraphic data performed in the lower part of the Gabardiella section. Sixty-three levels were sampled in 218 m with the aim to determine the Cuisian- Lutetian boundary at this location. Despite the limited quality of the data, we observe normal and reverse primary directions with a mean of (n, D, I, Alfa95 &...

The Jánovas sector presents a pattern of fold superposition as a consequence of non-coaxial folding. Step-bystep bedding correction of paleomagnetic vectors to the original coordinate system has been carried out considering the reverse sequence of tectonic events. Comparison with classical one-step bedding correction indicates better results cluste...

Complex kinematic scenarios in fold-and-thrust belts often produce superposed and non-coaxial folding. Interpretation of primary linear indicators must be based on a careful restoration to the undeformed stage following the reverse order of the deformation events. Therefore, sequential restoration to the ancient coordinate system is of key importan...

A lithostratigraphic description of Middle and Upper Jurassic of the Tor-rent de Sa Jonquera section (Serra de Artà, Majorca) is presented. This sec-tion shows intermediate stratigraphic features between the two palaeogeo-graphic domains defined in the Jurassic of the Majorca Island: Sierra Norteand Sierra de Levant. The Middle Jurassic shows strat...

When two or more magnetic components share the same temperature and/or coercivity spectrum in a rock, the paleomagnetic components are said to be overlapping. Failure to separately identify these components in the laboratory may lead to substantial errors in the declination and inclination of the primary component (including apparent changes in pol...

The current available Shallow Benthic Zones (SBZs) calibration based on larger foraminifera is now being improved for the Paleogene Period. In this work, the San Pelegrín section in the External Sierras, shows new magnetostratigraphic and biostratigraphic information from the Southwestern Pyrenean basin, where the larger thickness of the shallow ma...

The Es Barraca Member (Sinemurian) of the Majorca island in the type locality corresponds to a 207 m thick succession of shallow platform car-bonates. A detailed facies analysis of this section has allowed to characterize 9 facies types, which encompass from supratidal to low-energy open shallow subtidal environments. According to the vertical faci...

The Ainsa Basin (south-central Pyrenees) is an exceptional example of a syntectonic foreland basin where structures oblique to the Pyrenean trend are well preserved. The absence of a complete chronostratigraphic frame motivated us to perform a detailed magnetostratigraphic study in the Ainsa Basin, including the shallow-marine–conti-nental transiti...

In this paper, we present a chronostratigraphic calibration of the shallow benthic zones (SBZs) of larger foraminifera during Lutetian times based on new magnetostratigraphic data (Isuela section) and two new densely sampled biostratigraphic sections (Isuela and Gabardiella). These sections are located in the External Sierras (Southern Pyrenees) an...

Despite the large amount of paleomagnetic and structural studies on fold and thrust belts, many key questions about rotational kinematics remain unsolved (pace of rotation, subsequent accommodation of the hanging wall, etc.). Excellent exposure conditions and syntectonic sedimentation related to the growth of oblique structures in the Southern Pyre...

Seven paleomagnetic sites (from Liassic to Eocene ages) have been studied in the Toundout section in the Southern Atlas front aiming to characterize the paleomagnetic signal and its suitability to perform further tectonic studies on the thrust front kinematics. Liassic and Upper Cretaceous rocks show well-defined paleomagnetic (unidirectional and n...

Anisotropic magnetic susceptibility (AMS) analysis of 1454 samples evenly distributed along an 1800 m section in the South Pyrenean Zone is presented. The sampled rocks are pre- and syn-tectonic limestones, marls and sandstones of Ypresian-Lutetian age. They are weakly deformed rocks sampled from both limbs of the N–S trending Boltaña Anticline (ob...

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...

Two magnetostratigraphic profiles (450 samples) have been carried out to constrain the age of synorogenic formations in the southern foreland of the High Atlas of Morocco. The Amekchoud profile covers the Aït Ouglif and Aït Kandoula alluvial formations that form the bulk of the Ouarzazate basin fill, indicating an age between the upper Langhian and...

In this work we present AMS results obtained from several profiles in the Lutetian, carbon-ate-slope sequence located in the eastern limb of the Boltaña anticline. The AMS analyses allow us to define the deformational events related to the formation of the Boltaña anticline and its progressive rotation during Eocene (Late Lutetian) times, acting as...

The Balzes anticline is a complex structure outcropping in the eastern part of the External Sierras (southwestern Pyrenees). It is a representative oblique structure of this area, where many N-S trending anticlines are parallel to the main stretching direction. Paleomagnetic analyses allow a preliminary kinematics model to be proposed for this stru...

Groundwater resources in deltaic aquifers are essential in the Mediterranean region to sustain the socio-economic development of coastal communities and shallow-water ecosystems. Understanding the geological connection between coastal aquifers and the offshore sedimentary record is important to better predict consequences in terms of water manageme...

In this work we present new paleomagnetic data (magnetostratigraphy and vertical axis rotations) from several profiles in the carbonate slope Cuisian-Lutetian sequence located in the Boltaña anticline. AMS analyses were also performed to obtain additional kinematic information. This dataset pretend to unravel the emplacement mode (geometry and kine...

Resumen: En este trabajo se presentan nuevos datos paleomagnéticos tomados en diversos perfiles de la serie Cuisiense-Luteciense de talud carbonatado del flanco E del anticlinal de Boltaña. Las muestras analizadas muestran polaridades normales e invertidas, de acuerdo con su posición en la escala magnetoestratigráfica. A partir de la interpretación...

Resumen: El análisis paleomagnético llevado a cabo sobre 197 muestras de la serie Luteciense, en las inmediaciones del Pico del Aguila, Pirineo Aragonés, ha permitido caracterizar una magnetización primaria (secuencia local de polaridades), así como los valores de rotación asociados a esta estructura DEC, INC, α 95 y k= 030, 36 ,3 y 65 con n=148. L...

Abstract: This paper shows the geological and hydrogeological characterization of the different lithostratigraphic units cropping out around Santa Liestra village (Huesca province), in the middle part of Ésera river. These materials are Eocene aged, and are located in the Tremp-Graus basin of the central south Pyrenean unit. They correspond with 6...

The Ebro Delta is under the influx of drastic changes on the river flow regime induced by humans as a consequence of the river damming. Also, the morphology of its delta plain has been deleted in recent years due to the progression of its cultivated surface. The geomorphologic analysis of an 1:5000 scale ortofoto map obtained in 1927 (CHE), prior t...

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...

Multichannel and high resolution seismic profiles from the central Scotia Sea and northern Weddell Sea show a sequence of seismic units interpreted to be the result of high-energy bottom currents. The seismic character of the units is indicative of active bottom flows, which developed extensive drifts under the influence of the Weddell Sea Bottom W...

http://www.ub.edu/paleomag/magiber4_Vigo.htm

http://www.ub.edu/paleomag/magiber4_Vigo.htm

Multichannel and high-resolution seismic profiles complemented with swath bathymetry show a variety of contourite deposits in the northern Weddell Sea resulting from the interaction between bottom currents and the seafloor physiography. Seven types of contourite drifts are identified based on the seismic signature, reflector configuration and geome...

Middle to Upper Pleistocene fluvial sediments of the Cádiz Bay occur fifling partly two disconnected sub-basins excavated into shallow marine deposits of Pliocene to Lower Pleistocene age, and are buried under fluvial and estuarine Hofocene deposits. Subsurface, drill cores, and surface informatio indicate that the area of the Bay was occupied by a...

The Tor-Casamanya Synclinorium is made up of silurian and devonian rocks. Every devonian formations, except Fonchanina Fm., of the Sierra Negra subfacies area are recognized in this syncline. The cartographie of this unit has allowed us to observe the Civis Fm. outcropping in the synclinorium central area and the Castanesa Fm. outcropping in whole...

The following values have no corresponding Zotero field: ID - 297

In the southeastern Ebro Foreland Basin, the marine deposits of Lutetian and Bartonian age show excellent outcrop conditions, with a great lateral and horizontal continuity of lithostratigraphic units. In addition, the rich fossil record -mainly larger foraminifers-, provides iostratigraphic data of regional relevance for the whole Paleogene Pyrene...

The development of the Scotia Sea resulted from the plate motions of South America and the Antarctic Peninsula since the Oligocene. During the SCAN 2001 cruise we investigated a sector of the central and southern Scotia Sea using swath bathymetry, multichannel and high resolution seismic profiles, together with magnetic field measurements. The obje...

The present study describes the seismic characteristics, sequence stratigraphy and stacking pattern of several relict contouritic drifts which achieve the Quaternary paleoceanographic and tectonic influences of the Contourite Depositional System of the Gulf of Cadiz. This study has been carried out using a broad database (bathymetric, side-scan son...

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...

The lateral ending of the South Shetland Trench is analysed on the basis of swath bathymetry and multichannel seismic profiles in order to establish the tectonic and stratigraphic features of the transition from an northeastward active to a southwestward passive margin style. This trench is associated with a lithospheric-scale thrust accommodating...

New swath bathymetry with multichannel and high resolution seismic profiles shows a variety of contourite drift, sediment wave morphologies, and seismic facies in the central Scotia Sea. The deposits are to be found at the confluence between the two most important bottom current flows in the southern ocean: the eastward flowing Antarctic Circumpola...

A new morphosedimentary map of the Gulf of Cadiz is presented, showing the contourite depositional system on the gulf's middle slope. This map is constructed from a broad database provided by the Spanish Research Council and the U.S. Naval Research Laboratory. Our map shows that this contourite depositional system comprises five morphosedimentary s...

In the Ebro Delta, NE Spain, small- to large-scale synsedimentary deformation has been observed by means of high- and low-resolution seismics correlated with a network of wells. Lithoseismic units involved are middle–upper Pleistocene clays and gravels and Holocene deltaic sequence. Gassy sediments and large river-floor pockmarks are identified fro...

The development of the Scotia Sea resulted from the plate motions of South America and the Antarctic Peninsula since the Oligocene. During the SCAN 2001 cruise we investigated a sector of the central and southern Scotia Sea using swath bathymetry, multichannel and high resolution seismic profiles, together with magnetic field measurements. The obje...

The Geosites Project, initiated by the IUGS Global Geosites Working Group and supported by UNESCO, aims to produce a global inventory of the Earth's geo-logical heritage. This global inventory requires a sys-tematic methodology, based on the selection of geologi-cal frameworks of international significance in each country. These frameworks are topi...

This paper reports a comparative study of the use of palaeohydrological and hydrological techniques to estimate magnitude and frequency of floods applied to two high-gradient, small catchments located in the Spanish Central Pyrenees: the Arás basin, 18.6km2; the Montardit basin, 15.2km2. Palaeohydrological (palaeoflood) techniques, based on palaeos...

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...

The Geosites project, initiated by the IUGS Global Geosites Working Group and also supported by UNESCO, aims to produce a global inventory of the Earth's geological heritage. This global inventory requires a systematic methodology, which is based on the selection of geological frameworks with international significance, in every country. These fram...

Detailed geological mapping of the Areta River zone shows that the Upper Lutetian marls and limestones lay unconformably over the Sierra de Illón fore- and backthrust (SITh). Illerdian- Middle Lutetian marls and limestones have been deformed by the SITh, which have been eroded in the hangingwall of the fore- and backthrust. Only Illerdian- Middle L...