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Publications (51)
Testing and research centres for offshore renewable energy, exemplified by facilities like BIMEP (Biscay Marine Energy Platform) on the Basque coast of Spain, play a crucial role in driving the energy transition. This study utilises pre-existing data at the facility site, such as high-resolution bathymetry and granulometric information from sedimen...
We present new radiometric ages and full-vector paleomagnetic data from São Vicente Island, Cape Verde. Samples were obtained from a sequence of 11 nephelinitic flows. A K-Ar age determination was performed on the lowermost flow of the sequence, yielding an upper Miocene age of 6.07 ± 0.16 (2σ) Ma. Considering the normal polarity observed in all fl...
We present new radiometric ages and full-vector paleomagnetic data from São Vicente Island, Cape Verde. Samples were obtained from a sequence of 11 nephelinitic flows. A K-Ar age determination was performed on the lowermost flow of the sequence, yielding an upper Miocene age of 6.07 ± 0.16 (2σ) Ma. Considering the normal polarity observed in all fl...
We report paleointensity results obtained with the multispecimen method (MSP) over the Pliocene sequence of Apnia (Georgia) which records a polarity reversal. Paleointensity determinations with the multispecimen technique were performed on 12 flows with the original (MSP‐DB) and the domain‐state corrected (MSP‐DSC) protocol. Eight MSP‐DSC determina...
In this paper, the evolution of the fabric and 3D geometry of the Calmayo trondhjemitic pluton (512.1 ± 3.4 Ma; Sierra Chica, Córdoba, Argentina) is analyzed using Anisotropy of Magnetic Susceptibility (AMS) measurements combined with structural and microstructural data. Gravity data reveal that the pluton is a funnel-shaped body resting on one mai...
In this paper we report on a compilation of more than 2,200 sites (more than 10,000 individual measurements) where anisotropy of magnetic susceptibility (AMS) was studied in granite from the Variscan Pyrenees. The standardization and homogenization of this information has allowed us to produce three maps that synthesize all the information related...
We report 28 successful Thellier type absolute geomagnetic paleointensity determinations from a Pleistocene lava sequence composed of 39 successive flows in the Djavakheti Highland (Lesser Caucasus, Georgia). Additionally, multispecimen technique provided the estimation of geomagnetic field strength for 12 independent cooling units. Paleointensity...
RESUMEN Reportamos cuarenta y seis determinaciones de paleointensidad absoluta, en una secuencia pleistocena de 39 flujos de lava consecutivos ubicados en la Meseta de Djavakheti, en el Cáucaso Menor, en Georgia. Las edades radiométricas y los datos paleomagnéticos existentes, sugieren dos posibilidades. Los 36 flujos de la parte inferior de la sec...
A detailed palaeomagnetic, rock-magnetic and palaeointensity study has been carried out on
a Miocene volcanic sequence which consists of 39 consecutive lava flows recording a polar-
ity transition in La Gomera (Canary Islands, Spain). In addition, new 40Ar/39Ar ages were
obtained in two flows, yielding 9.63±0.06 Ma in the lower and 9.72±0.08 Ma in...
The Cachi mountain ranges, located in Salta (NW Argentina), form an inlier where Neoproterozoic and Paleozoic materials of the Andes crop out in a plutono-metamorphic dome surrounded by Mesozoic and Cenozoic sedimentary rocks. The pre-Mesozoic rocks record a regional metamorphism of low pressure and high temperature conditions, which reached partia...
A palaeomagnetic and rock-magnetic investigation has been carried out on a Pliocene lava flow sequence in the Djavakheti Highland in the central Lesser Caucasus in the Republic of Georgia. In addition, a 40Ar/39Ar dating and electronic microscopic studies were performed on samples of this sequence, named the Saro section, which consists of 39 succe...
We present here preliminary results about the magnetic fabric of the Punta Negra pluton (Iquique, Chile), based on the anlysis of the anisotropy of the magnetic susceptibility (ASM) of 59 oriented specimens from 8 sampling sites distributed in a N-S cross-section along the cliffs nearby the Iquique town. We have also carried petrographic studies of...
This study deals with the structure and emplacement of the Calmayo and El Hongo trondhjemite plutons (Famatinian belt of Córdoba, Argentina). It provides structural data from the granites and the country rocks and a study of the magnetic fabric in the plutons. New U/Pb geochronological data yield intrusion ages of 512.1 ± 3.4 Ma and 500.6 ± 4.5 Ma...
Resumen: Se presentan resultados preliminares de magnetismo de rocas y paleomagnetismo realizados en luna secuencia de coladas basálticas (Saro), en el sur de Georgia. Se cuenta con 39 coladas con una edad de 2.2 Ma (Lebedev et al., 2008). Los análisis de las curvas termomagnéticas permiten distinguir cuatro tipos de muestras: a) Tipo H, muestras c...
The Tastil batholith, located in the Eastern Cordillera of the Andes,
spreads over more than 500 square kilometers and is mainly emplaced in
the Puncoviscana Formation, of Neoproterozoic to Eopaleozoic age. The
main structures in the country rocks are tight folds with angular
geometry, which only locally develop a spaced axial-planar cleavage.
Fold...
The Sierra de Cachi is a mountain range located in NW Argentina, near
Salta; it spreads along 50 km in a N-S direction across the pre-Andean
basement of the Calchaqui Valley. This window of pre-Andean consists of:
1) greywacke and slates of the uppermost Neoproterozoic to Early
Cambrian Puncoviscana Formation, 2) schists, gneissic rocks and
migmati...
The main orogenic reworking of the Betic Cordillera, in southern Spain, is a consequence of a short but severe Alpine event of Aquitanian to Burdigalian age that almost erased any evidence of pre-Mesozoic orogenies. New SHRIMP analyses on zircons from high-grade metamorphic rocks of tectonic units underlying the Ronda peridotites (Alpujarride Compl...
The recorded data from: the late Caledonian Galway Granite, Connemara, Ireland, and the Variscan Ribadelago Pluton, NW Iberian Massif Spain, reflects a protracted evolution of the sphene-centred ocellar texture, from its origin by dilatancy in highly crystallised magma mushes to its subsequent disappearance by mechanical disaggregation. This mingli...
The sphene-centered ocellar texture consists of leucocratic ocelli with sphene (titanite) crystals at the center, enclosed in a biotite-rich matrix. This texture has been recognized worldwide in hybrid intermediate rocks. On the basis of structural, petrological, and geochronological data from selected outcrops of the Variscan Ribadelago pluton (NW...
Resumen Este trabajo presenta resultados preliminares sobre los experimentos de magnetismo de rocas y paleomagnetismo realizados en una secuencia de coladas basálticas (Saro) con una edad estimada en 2,0 a 2,2 Ma mediante dataciones radiométricas con el método K-Ar (Lebedev et al, 2008), localizada en la meseta de Dzavakheti, en el sur de Georgia....
The Tastil batholith (Eastern Cordillera, NW Argentina) holds relevant keys for interpreting the tectonic evolution of the Central Andes basement since it has always been interpreted as the subcrop of the Cambrian and Lower Ordovician basins in the Eastern Cordillera. However, in the Angosto de la Quesera section, the batholith intrudes sandstones...
A paleomagnetic, rock-magnetic and paleointensity study was carried out on 21 basaltic lava flows belonging to four different sequences of late Pliocene age from southern Georgia (Caucasus): Diliska (5 flows), Kvemo Orozmani (5 flows), Dmanisi (11 flows) and Zemo Karabulaki (3 flows). Paleomagnetic analysis generally showed the presence of a single...
Thirteen middle-Miocene to Pliocene volcanic sites, belonging to four
different types of volcanism (calc-alkaline volcanism, potassic
calc-alkaline and shoshonitic volcanism, lamproitic volcanism and
basaltic alkaline volcanism), have been sampled in south-eastern Spain
for paleointensity determinations. Rock-magnetic studies yield low-Ti
titanomag...
The Fada N′Gourma area in Burkina Faso is underlain by Paleoproterozoic rocks that make the northeastern West-African Craton.
This region is composed of NE-trending volcano-sedimentary belts and foliated tonalites, affected by several shear zones.
A generation of younger, ∼2100Ma-old, non-foliated biotite-bearing granites intrudes the former rock u...
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...
This work deals with the structural evolution and kinematics of the basal dynamothermal aureole of the Ronda peridotites, located in the Sierra Bermeja massif of the Western Betic Cordilleras, in southern Spain. This aureole is characterized by: 1) a marked strain gradient towards the contact with the overlying peridotites; 2) the great angular dis...
This work analyzes the structural features of the Sopelana Fault, developed in extensional conditions during Cretaceous and Tertiary times, and inverted during the Alpine orogeny. The study area is located on the NE limb of the Biscay Synclinorium, a major structure in the Basque Arc. The Sopelana Fault bounds the northern outcrops of the Cenozoic...
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...
This study deals with the structure of the El Hongo trondhjemite, a ENE–WSW elongate pluton belonging to the Famatinian magmatic arc that developed from Late Cambrian to Silurian times in the Sierras Pampeanas (Argentina). Anisotropy of magnetic susceptibility (AMS) measurements combined with structural and microstructural data permit the correlati...
Magnetic fabric patterns and microstructures of granitic rocks provide evidence of structural modifications as a result of the coalescence of two plutons, Alpa Corral and Talita, during the construction of a large granitic batholith, Cerro Aspero, in the Sierras Pampeanas of Córdoba (Argentina). The Alpa Corral granite is a small and nearly circula...
The Sanabria region (Central Iberian Zone, Variscan belt of Spain) shows an asymmetric thermal dome marked by migmatites accompanied by the Ribadelago and the Sotillo plutons. These small plutons display pronounced mineralogical variations. Biotite granodiorites and tonalites prevail, and granites and gabbros are common. Both plutons are confined i...
The Ollo de Sapo Domain (OSD), a large antiform that delineates the Ibero-Armorican Arc within the northern part of the Iberian Massif in NW Spain, is pierced by several granitic plutons. The pre-, syn- or post-kinematic emplacement of such plutons is a current issue of debate. Here, we report the structural study, based on field and anisotropy of...
