Valenti Turu

• Doctor of Philosophy
• Researcher at Marcel Chevalier Earth Sciences Foundation

L'échantillonnage de veines à quartz de différentes surfaces d'érosion ont été faites en 2002 (Fig. 1) pour obtenir du néon et béryllium cosmogénique (21Ne, 10Be). Le but etait de dater les phases du dernier cycle glaciaire qui, du même que pour le reste des vallées des Pyrénées meridionaux (Bordonau, 1992), est censé avoir occupé la vallée andorra...

Paleoenvironments encapsulate climate characteristics and the hydrological, geological, biological & anthropic factors of the past. In a mountain range, paleoenvironments and the landscape overlap, ecosystems and relief hybridizes. The human footprint is relatively recent given the age of the biome in mountain areas, and it is challenging to percev...

El hidrolacolito de Las Calderuelas, situado en pleno corazón del Parque Nacional de Guadarrama (Sistema Central), es una estructura de excepcional valor científico y natural, cuyo comportamiento y evolución están condicionados por las características estratigráficas de su estructura interna y las variaciones climáticas del entorno en el que se ubi...

Permafrost study in the Spanish Central System (�41�N) has remained elusive in past decades. Although numerous periglacial features have been described, none has yielded conclusive information about the existence/distribution of permafrost across these mountains. This work focuses on integrating light detection and ranging and unmanned aerial vehic...

In the Pyrenees, sporadic permafrost also exists at lower altitudes, where several active rock glaciers have been also identified. In this mountain range, the presence of permafrost has been mostly detected through the mapping of geomorphological indicators (rock glaciers, protalus lobes, frost mounds, etc), bottom temperature snow measurements, ge...

Elsevier congratulation for publishing open access articles between 2020-2022 linked to the United Nations Sustainable Development Goals, helping to tackle some of the world's greatest challenges. Paper: Palaeoenvironmental changes in the Iberian central system during the Late-glacial and Holocene as inferred from geochemical data: A case study of...

Permafrost study in the Spanish Central System (~41°N) has remained elusive in past decades. Although numerous periglacial features have been described, none has yielded conclusive information about the existence/distribution of permafrost across these mountains. This work focuses on integrating light detection and ranging and unmanned aerial vehic...

Dynamique glaciaire au Pléistocène moyen‑supérieur dans les vallées de la Valira (principauté d'Andorre). Asymétries au sein des Pyrénées et corrélation entre les chaînes de montagnes européennes les plus occidentales

The area of Prados del Cervunal (PC) is an intra-morainic topographic depression located at 1800 m asl in the divide or interfluve between Garganta de Gredos and Garganta del Pinar valleys (Central Gredos; Iberian Central System, ICS). Both valleys, along with the adjacent Hoya Nevada, were occupied by glaciers during the Upper Pleistocene, leading...

An MIS 2 glaciation type is asserted in the central Iberian Peninsula (W Europe) in which a competition to enlarge their glacier tongues produced the built-up a middle-moraine complex, suited for cosmogenic dating. The glacial evolution of Gredos and Pinar glacier is in this paper exposed and provide the fundamentals for further research in the reg...

Many sediment-covered mountain areas affected by the growth of Pleistocene glaciers are over-consolidated. Palaeoglacial conditions are deduced from glacial consolidation and site investigations. Geomorphological evidence on the glacial extent and history is in this Thesis used as a framework for hydro-mechanical flow simulations in the valley glac...

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This study uses luminescence and 14 C accelerator mass spectrometry procedures to date relevant glaciofluvial and glacial deposits from the south-central and southeastern Pyrenees (Andorra-France-Spain). We distinguish two types of end-moraine complexes: (1) those in which at least a far-flung moraine exists beyond a frequently nested end-moraine c...

RESUMEN El presente trabajo se localiza en el sector central de la Sierra de Guadarrama, coincidiendo con las delimitaciones del Parque Nacional. El objetivo es realizar el inventario, cartografía, cronología e interpretación de la secuencia crono-evolutiva de sus paleoglaciares. La Sierra de Guadarrama es una montaña media mediterránea, estructura...

Supplementary file of Glacial-Interglacial cycles in the south-central and southeastern Pyrenees since ≈ 180 ka (NE Spain - Andorra - S France)

Journal: QUA (Quaternary Research) Manuscript: S0033589422000680jra Q1 The distinction between surnames can be ambiguous, therefore to ensure accurate tagging for indexing purposes online (e.g. for PubMed entries), please check that the highlighted surnames have been correctly identified, that all names are in the correct order and spelt correctly....

The glacial headwaters of the Noguera Pallaresa and the Valira retain the features of the high Pyrenean mountains, namely rounded glacial landforms, such as wide compound cirques, transfluence and glacial diffluence cols, and large overdeepened basins in the main valleys. The Central-Eastern Pyrenees were home to six large glacial collectors with l...

The Iberian Central System (ICS) is a clue region to reveal Mediterranean/Atlantic inferences over Iberia. We present a multidisciplinary study from western Spain conducted in the Navamuño depression (ND), covering the last 16.8 ka (cal BP). A reconstruction of the palaeotemperature from the resulting geochemical data highlights four cold and dry i...

The Roca San Miguel (RSM) archaeological site was occupied during Mousterian times. Here we present a geoarchaeological and paleoenvironmental reconstruction of the site. Five stratigraphic units (A to E) formed by different archaeological levels are identified. Three optically stimulated luminescence (OSL) ages show that Unit A dates to between 16...

Geological and geophysical studies in complex valley troughs provide a key record for the reconstruction of paleoenvironmental conditions during the Quaternary. Here we present a study of the sedimentary infill of the El Cervunal kame complex or El Cervunal trough (Sierra de Gredos, Iberian Central System) by means of a combined interpretation of n...

We present a detailed geomorphological map of the landform assemblages originated by the two major paleoglaciers of the Sierra de Gredos mountain range in the Spanish Iberian Central System. Based on previous works, our map focused on the features formed by Gredos and Pinar paleoglaciers during the last glaciation and subsequent glacial events. Bas...

A lo largo de la historia los grupos humanos han habitado las montañas. En los Pirineos, el sector del alto Segre, los valles de Andorra y el sur de Ariège, han dado testimonios de comunidades totalmente adaptadas al territorio desde la segunda mitad del quinto milenio antes de Cristo. Los estudios recientes de los materiales exhumados en Juberri,...

ABSTRACT. This research describes the finding of a hydro-laccolith in the Sierra de Guadarrama (Central System). The study, based on the combination of Digital Terrain Models (DTM) and geoelectric data, allowed the characterization of the surface morphology and internal structure. The results allow establishing the genesis of this pe-riglacial-rela...

Most of the athalassic saline and hypersaline lakes are located in arid and semiarid regions where water availability drives the hydrological dynamics of the lake itself and the associated ecosystems. This is the case of the Salada de Chiprana Lake, in the Ebro River basin (Spain). It is the only athalassic permanent hypersaline lake in Western Eur...

A new record from a long sediment core (S3) in Navamu~ no (1505 m asl, western Iberian Central System) provides the reconstruction of the vegetation history and environmental changes in the region between 15.6 and 10.6 ka cal BP, namely during the Late Glacial and the early Holocene, using a multiproxy analysis (pollen-based vegetation and climate...

A lo largo de la historia, los grupos humanos han habitado las montañas. En los Pirineos, el sector del alto Segre, los valles de Andorra y el sur de Ariège, han dado testimonios de comunidades, totalmente adaptadas al territorio, desde la segunda mitad del quinto milenio antes de Cristo. Los estudios recientes de los materiales exhumados en Juberr...

New OSL dating from the Southern slope of the Pyrenees are present in this work. Such a datations update the most relevant glacial phases identified by previous authors. From our data two glacial cycles are clearly dated, the penultimate and the last glacial cycle. The last glacial cycle can be divided in four major phases: 1. An early glacier ext...

This book contains four chapters dealing with the investigation of facies analysis and paleoecology, chemostratigraphy, and chronostratigraphy referring to paleoecological and facies analysis techniques and methodologies. The chapters pertain in particular to an Oligo-Miocene carbonate succession of the Persian Gulf (Asmari Formation), the chemostr...

The Azilian culture is found at Balma de la Margineda (Andorra) as early as the end of the Bølling. The study of the industry has shown that the flint source of the early human occupation came from the Ebro basin. However, the harpoons that are characteristic of the Azilian period in the eponymous Mas d’Azil site and also in Aquitaine suddenly appe...

Mesolithic and Neolithic paleogeography from Andorra valleys. Three main subjects are here introduced: 1) the former base level at the main valley of Andorra. 2) the footprint of Bond events looking at the dated charcoals from sediments of the valleys. 3) the impact of the different cultures in the origin of paleofires. The conlusions are A) that s...

El coneixement relatiu a les primeres societats de caçadors-recol·lectors del Last Termination en el context dels Pirineus i els seus efectes sobre l'entorn són encara avui discontinus i aproximatius. Històricament, l'escàs nombre de jaciments documentats en espais de muntanya s'ha interpretat com el resultat de les extremes condicions climàtiques...

This work is close beyond the common applicability of the sequence stratigraphy principles. Nevertheless one aim is to demonstrate its validity for a small ice-dammed palaeo-lake. Since base-level variability is smoothly related with an oscillatory motion, the chronostratigraphy chart emerges as a crucial tool to produce enough quantitative data fo...

The geometric and genetic characterization of the Navamuño depression peatland system (Iberian Central System) is presented here using results from a geophysical survey. This depression is a ~30 ha pseudo-endorheic flat basin over granitic bedrock. Three geophysical techniques were used to map the subsurface geology, and identify and describe the i...

The Navamuño peatbog (Sierra de Béjar, western Spain) is a ~14 ha pseudo-endorheic depression with boundaries defined by a lateral moraine of the Cuerpo de Hombre paleoglacier and fault-line scarps on granite bedrock. The stratigraphy of the Navamuño peatbog system is characterized here using borehole data to a depth of 20 m. An integrated interpre...

The Navamuño peatbog (Sierra de Béjar, western Spain) is a ∼14 ha pseudo-endorheic depression with boundaries defined by a lateral moraine of the Cuerpo de Hombre paleoglacier and fault-line scarps on granite bedrock. The stratigraphy of the Navamuño peatbog system is characterized here using borehole data to a depth of 20 m. An integrated interpre...

Autor que presenta la comunicación: Félix Rubio RESUMEN: El complejo lagunar de las Saladas de Chiprana se ubica en el sector suroriental de la provincia de Zaragoza. Para su estudio hidrogeológico, se han efectuado una serie de campañas geofísicas entre agosto y noviembre de 2015. Se midieron 13 perfiles eléctricos en 8 emplazamientos alrededor de...

Existeix una important diversitat litològica dels utensilis i les eines trobats als jaciments de Feixa del Moro, Camp del Colomer i Carrer Llinàs 28. Un 52% corresponen a roques metamòrfiques de diversa duresa, entre les quals destaquen quarsites, esquists i pissarres fosques, bàsicament cornianes. En aquestes últimes són ben visibles els cristalls...

L’elevat nombre d’artefactes macrolítics relacionats amb treballs de mòlta, trituració i abrasió (molts dels quals amortitzats en sitges i fosses d’emmagatzematge) sembla configurar una economia dels grups humans de Juberri basada en l’agricultura cerealística en un grau superior al que s’havia interpretat fins ara, i amb una certa especialització....

En el punt actual del nostre coneixement no podem establir amb seguretat la funcionalitat d’aquests elements, entre altres raons perquè tots els casos s’han trobat fora de context, formant part de nivells d’amortització. Tot i les semblances entre ells, hem d’incidir en una certa varietat morfomètrica, cosa que podria indicar una funció determinada...

The ice-marginal depositional sequence of La Massana provides a chronostratigraphic benchmark for reconstructing the Wu¨rmian glacial evolution of the Valira catchment in Andorra, SE Pyrenees. The sedimentary record of Andorra confirms the asynchronous chronology of glacier fluctuations in different parts of the Pyrenean mountain range. A major ice...

En el punt actual del nostre coneixement no podem establir amb seguretat la funcionalitat d’aquests elements, entre altres raons perquè tots els casos s’han trobat fora de context, formant part de nivells d’amortització. Tot i les semblances entre ells, hem d’incidir en una certa varietat morfomètrica, cosa que podria indicar una funció determinada...

We propose to play attention to the study of primary source and the environmental data of C8 from the La Balma Margineda site (Andorra) to explain sporadic passages from the south or north in the eastern Pyrenees. The massive acid lavas found in C8 are related with a lamellar breackdown of these prismatic materials. Although most of the rhyolite ou...

Polythermal glaciers, like for Hansbreen calving glacier, motion is mainly ruled by the englacial water content and subglacial drainage regime. In this work GPR and NMR results are compared. Ground Penetration Radar available data from Hansbreen show that englacial water content is close to 4% and 2% while the range of the NMR data is between 0,12%...

La cubeta glaciar de Andorra la Vella y Escaldes Engordany se caracteriza por presentar dos acuíferos independientes alimentados por el macizo rocoso que le rodea. El más superficial es de tipo multicapa y está separado del inferior, que estaría confinado, por una capa impermeable. El objetivo de este trabajo es aportar nuevos datos hidroquímicos e...

El aporte de nuevos datos hidroquímicos e hidrodinámicos, junto con los datos piezométricos han ayudado a aumentar el conocimiento sobre el funcionamiento del sistema hídrico que existe en la cubeta de Andorra. El objetivo principal ha sido poder establecer un modelo matemático básico, en régimen permanente, que englobe la totalidad de la cubeta pa...

Title: Geochemistry analysis from glaciolacustrine sediments from La Massana and Ordino –Andorra, Southeastern Pyrenees-: Paleoenvironmental interpretation of the sedimentary influx between glacially constrained paleolakes) Geochemistry of glaciolacustrine deposits in the Pyrenean range is poorly studied. In that sense we have investigated the fin...

En Febrero del 2004 tuvo lugar un deslizamiento en el sector conocido como " El Mollà " en la zona de " Els Cortals d'Encamp ". Aunque el sector presenta una dinámica activa, el frente de infiltración de una rotura de la red de agua potable 62 días antes, actuó como detonante de la inestabilidad en incrementar la presión intersticial y reducir la c...

This paper analyses the glacial evolution of the Pas Mountains, in the Eastern Cantabrian Mountains, the glacial landforms and deposits by geomorphological mapping, electric and seismic surveys, and dating intramorainic peat bog and till deposits. The external morainic complex (S-I) shows a glacial extension maximum before 29.150-28.570 cal a BP. A...

At the north-western limit of the Mediterranean basin, in the Mediterranean–Oceanic transition zone, the multidisciplinary study of two palaeolakes: Villaseca and La Mata (Province of Leon), provides data on the last deglaciation. The juxtaglacial lakes were formed during a deglaciation phase of the last cold stage (Weichselian/Würm) estimated, fro...

This paper analyses the glacial evolution of the Pas Mountains, in the Eastern Cantabrian Mountains, the glacial landforms and deposits by geomorphological mapping, electric and seismic surveys, and dating intramorainic peat bog and till deposits. The external morainic complex (S-I) shows a glacial extension maximum before29.150-28.570 cal a BP. A...

Glaciers are widely spread on polar and sub-polar regions but also on middle latitude mountains, where cold-dry type glaciers, polythermal glaciers and temperate-wet glaciers are respectively present. Polythermal glaciers have a cold-ice layer (temperature below the pressure melting point) overriding a temperate-ice layer. Nineteen magnetic resonan...

Glaciers are widely spread on polar and sub-polar regions but also on middle latitude mountains, where cold-dry type glaciers, polythermal glaciers and temperate-wet glaciers are respectively present. Polythermal glaciers have a cold-ice layer (temperature below the pressure melting point) overriding a temperate-ice layer. Nineteen magnetic resonan...

Without representative data of the whole family of subglacial sediments (EVANS et al., 2006) the rheological study of them is almost impossible, but some light can be found using in situ geotechnical tests. Pressuremeter tests that permit elements of consolidation history to be deduced have been obtained from glacial sediments in the Valley of Ando...

Terminal morainic complexes from the main Valira valley The glaciarism of the Andorra valleys has been studied by several geologists and geomorphologists since the last century. The glacial front during the last glacial maximum was located near Pont Trencat, at about 760 m asl. Northward on, at Sant Julià de Lòria (900 m. asl.), two generation of g...

Dels resultats de l'isòtop cosmogènic 21Ne hom pot observar la diferència entre cicles d'englaçament per la mostra del circ de Tristaina (2.460 m) ha estat englaçat més sovint (menys exposició) que al fons de vall d’Ordino (1.730 m). Però també permet donar-se compte que el valor de T és superiors al cicle l’orbital de 100.000 anys. Els estudis clà...

The glacial geomorphology of the Coma de Burg and the lowermost part of the Vall Farrera valley, Noguera Pallaresa basin: Coma de Burg is characterized by an unusual history due to its reduced dimensions. This work aims to propose an interpretation for the geomorphologic evolution of Coma de Burg, and to relate that with the glacial evolution in th...

Glacial Geomorphology of the final section of the Noguera Pallaresa and Flamicell Rivers (The Pallars): Some sedimentary deposits associated with frontal moraines have been analyzed in the valley of the Noguera Pallaresa river. In this valley all fronts moraine have not been preserved. However, in the Flamicell river valley have been identified two...

The fluvial terraces from the Segre bassin: ourcroups and cotrelarion. In Segre bassin can be disfinguished up to 10 total levels of fluvial terraces. A first correlation for the main Segre tributarles has been done regarding the complete and well dated Cinca river terraces sequences. We observe in such correlation a general amalgamation tendency o...

Soil cartography of the Madriu valley, Principality of Andorra, Southeastern Pyrenees: Since 2004 the Madriu valley is on the UNESCO World Heritage List. This cartography was included on lhe candidature documentation amd has been unpublished since now. In essence 31 Km2 has been mapped following the FAO soil legend (the 6.5% of Andorra), supported...

Geophysic and geomechanical survey of the Biescas glaciated valley, Central Southern Pyrenees, sedimentary infill structure and slope sediments): The large glaciated valleys of the Iberian Peninsula are located in the southern part of the Pyreneean-cantabric range, mostly in northern part of the Ebro basin. A common geomorphological feature in thes...

A l'engorjat de la Margineda s'estén, en un penya-segat a la riba dreta del riu Valira, una vasta balma oberta cap a l'est. El jaciment arqueológic el van donar a conéixer Pere Canturri i Joan Maluquer de Motes, que van publicar les troballes a la revista Zephyrus el 1962. Més tard, entre el 1979 i el 1991 , Jean Guilaine va dirigir les excavacions...

Pont Trencat: The 1427-1428 earthquake sequence at the Valira Valley, Southeastern Pyrenees): Geological evidences from a landslide at " Pont Trencat " locality dated from the fifteenth century, could be linked to the 1427-1428 catastrophic earthquake documented in the Spanish Garrotxa and Ripolles regions. Since now no notices were repported about...

Mesolithic palaeoenvironment in the Ordino Valley-NW Andorra, Southeastern Pyrenees: Landscape changes in the Early Holocene : Flooding sediments at Sornas (1300 m a.s. l) provide new information about geomorphological changes since the Last Termination and the Holocene in a high Mediterranean valley. The sedimentary record had several charcoal lay...

Mesolithic palaeoenvironment in the Ordino Valley -NW Andorra, Southeastern Pyrenees-: Landscape changes in the Early Holocene): Flooding sediments at Sornàs (1300 m a.s.l.) provide new information about geomorphological changes since the Last Termination and the Holocene in a high Mediterranean valley. The sedimentary record had several charcoal l...

La presente comunicación pretende dar a conocer el estado de conocimiento sobre las localidades fosilíferas del Principado de Andorra, encargado por el Área de Investigaciones Históricas del Departamento de Patrimonio Cultural y Política Lingüística del Gobierno del Principado de Andorra a la empresa Igeotest SL, con el asesoramiento del Instituto...

STRUCTURE OF THE LARGE GLACIAL BASINS IN THE NORTHERN IBERIAN PENINSULA, A COMPARISON STUDY: ANDORRA (EASTERN PYRENEES), GÁLLEGO (CENTRAL PYRENEES) AND TRUEBA VALLEY (CANTABRIC RANGE) Valley glaciers between 16 and 50 km in length developed during Pleistocene glacial maxima in the southern part of the Pyrenean-Cantabric range (Iberian Peninsula)....

Intensive investigations of the architecture and character of valley floor sediments have been undertaken in the main Valley, in association with site investigations for major constructions until 1995 (see TURU et al. 2007) with up to 900 geotechnical surveys in the country. The conclusion of all those surveying years is that the best geotechnical...

Meltwaters generally follow various paths until arriving at the snout, but significant amount enters through glacier crevasses and moulins as well as through lateral moraines, until saturating the subglacial aquifer (MENZIES, 1995). Eventually poor drainage of the system may accumulate water under the ice until a certain piezometrical height result...