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Publications (63)
This study analyzes the mechanical and elemental properties of lunar meteorites DHOFAR 1084, JAH 838, NWA 11444, and HED meteorite NWA 6013. Utilizing microscale rock mechanics experiments, that is, nanoindentation testing, this research reveals significant heterogeneity in both mechanical and elemental attributes across the mineral samples. Olivin...
Iberian lacustrine sediments are a valuable archive to document environmental changes since the last glacial termination, seen as key for anticipating future climate/environmental changes and their far-reaching implications for generations to come. Herein, multi-proxy-based indicators of a mountain lake record from Serra da Estrela were used to rec...
We analysed the petrothermal and petrophysical properties of the Upper Eocene alluvial fan, fluvial fan and lacustrine deposits in the NE Ebro Foreland Basin, South Pyrenean fold belt. The proximal facies located in the Oliana anticline consist of marine marls, transitional sulphates and non-marine alluvial sandstones and conglomerates. Distally, f...
This study aims the characterization of the sequence stratigraphy, the mineralogy and the thermal properties of deltaic deposits. As a case of study, we focused on the transgressive sequence set of the middle Eocene Cal Padró composite sequence of the Sant Llorenç del Munt fan-delta complex in the eastern Ebro foreland basin, related with the growt...
The lithographic limestone of La Pedrera de Meià (LPM) in south-central Pyrenees (NE Spain) is considered one of the best preserved lacustrine-coastal successions of the Early Cretaceous in Europe, hosting a taxonomically diverse record of Barremian biota. While this Konservat-Lagerstätte has been extensively surveyed for paleontological purposes,...
The present work aims to characterize the ephemeral mineral assemblage related to the fumarolic fields of the Tajogaite volcano, formed in 2021 in La Palma Island (Canary Islands, Spain). A set of 73 samples was obtained after two sampling campaigns in different fumarole sectors of the studied area. Mineralization related to these fumaroles formed...
Karstic bauxite deposits are the main resource of aluminum in Europe and are formed through a combination of weathering, leaching, and deposition processes known as bauxitization. Bauxites have recently been proposed as unconventional resources of rare-earth elements (REE) as well. The studied karstic bauxite deposits are located on the salt-detach...
The Traspena meteorite fell on 18 January 2021 about 20 km southeast of the city of Lugo (Galiza, Spain), shortly after a huge and bright fireball crossed the sky for 4.84 seconds. Astrometric measurements obtained from the fireball cameras of the Universidade de Santiago de Compostela (USC) as well as from many casual videos were used to determine...
We present a comprehensive experimental study of the crystal structure of calcium vanadate (Ca3V2O8) under systematic temperature and pressure conditions. The temperature evolution (4 – 1173 K) of the Ca3V2O8...
Les Ferreres range (Gavà, Barcelona, Catalonia) has seen several cultures and empires pass through the millennia. Since the Neolithic, its entrails have been mined in search of the men they hide. In the Neolithic period, variscite was the mineral that moved the miners to open galleries and trenches. Later, those who knew the secret of iron producti...
Understanding the environmental response to the last glacial termination in regions located in transitional climate zones such as the Atlantic Iberian mountains is crucial to estimate potential changes in regions affected by current glacial melting. We present an 8.5‐m‐long, solid last deglaciation and Holocene chronostratigraphic record including...
3 Estudio mineralógico de la mina "San Miguel", Ribes de Freser, el Ripollès, Girona, Cataluña RESUMEN La mina "San Miguel" (después mina "Maura") fue una pequeña mina que se encuentraba en la parte sur del va-lle de Ribes. En principio sería una más de las pequeñas explotaciones mineras que proliferaron a finales del siglo XIX en el valle de Ribes...
As stated in their announcements and accompanying information, Special Issues published in scientific journals are usually aimed at compiling recent progress on highly specialized topics [...]
Cobalt demand is increasing due to its key role in the transition to clean energies. Although the main Co ores are the sediment-hosted stratiform copper deposits of the Democratic Republic of the Congo, Co is also a by-product of Ni–Co laterite deposits, where Co extraction efficiency depends, among other factors, on the correct identification of C...
La Pedrera de Meià (LPM) fossil site, discovered in the 19 th century, is an important Barremian Konservat-Lagerstätte located at the southern slope of the Montsec range (Lleida province, Spain). LPM is comparable in fossil preservation with other European lithographic limestones lagerstätten sites such as Solnhofen (Germany), Cerin (France) or Las...
[This corrects the article DOI: 10.1371/journal.pone.0250776.].
RESUMEN Los estudios realizados en algunos ejemplares procedentes del filón 'rojo' de la cantera de Can Rovira, en Sant Fost de Campsentelles, mostraron la presencia de agregados de as-pecto foliáceo, blanquecinos y brillantes. En función de los re-sultados de los diferentes análisis llevados a cabo, estos agre-gados fueron determinados como surita...
In the Neolithic Gavà mines, variscite and turquoise were exploited for ornaments manufacturing, although some prospective pits and tunnels were dug on other similar greenish minerals such as smectite or kandite. A 3D study of the distribution of mineral phases allows us to determine the parameters involved in variscite colours. Methods are compris...
The crystal structures of newly found minerals are routinely determined using single-crystal techniques. However, many rare minerals usually form micrometer-sized aggregates that are difficult to study with conventional structural methods. This is the case for numerous platinum-group minerals (PGMs) such as, for instance, zaccariniite (RhNiAs), the...
Despite the paleontological relevance of the terrestrial Early Pleistocene Venta Micena bonebed (Baza Basin, Spain), it lacks a comprehensive geochemical/sedimentological study. Here, we demonstrate that the 1.5-m-thick Venta Micena limestone formed in a relatively small freshwater wetland/pond located at the periphery of the large saline Baza pale...
This study aims to assess the feasibility of delineating and identifying mineral ores from hyperspectral images of tin–tungsten mine excavation faces using machine learning classification. We compiled a set of hand samples of minerals of interest from a tin–tungsten mine and analyzed two types of hyperspectral images: (1) images acquired with a lab...
Calcite crystal morphologies reflect physical parameters of precipitation such as temperature and ion saturation and pressure,
as also CO2 release related to fluid boiling and effervescence (Montcada et al., 2012; Milodowski et al., 2018). We present a study of fracture-filling rose-like clusters of bladed calcites from the Cadí thrust sheet (SE Py...
This study aims to assess the feasibility of delineating and identifying mineral ores from hyperspectral images of tin-tungsten mine excavation faces using machine-learning classification. We compiled a set of hand samples of minerals of interest from a tin-tungsten mine and analyzed two types of hyperspectral images: 1) images acquired with a labo...
Numerous and extensive ‘Stone Walled Sites’ have been identified in southern African Iron Age landscapes. Appearing from around 1200 CE, and showing considerable variability in size and form, these settlements are named after the dry-stone wall structures that characterize them. Stone Walled Sites were occupied by various Bantu-speaking agropastora...
RESUMEN En función de los resultados obtenidos con diversas técni-cas analíticas (sobre todo mediante SEM-EDS y difracción de rayos X) se ha podido caracterizar como fehrita el mineral de la mina de Les Ferreres, en Rocabruna (Campro-don, Girona, Cataluña), que el año 2012 se codificó como uk-252. Se encuentra en las zonas externas de las bolsadas...
RESUMEN
En el término municipal de Sant Fost de Campsentelles, Barcelona, casi en el límite con el de Montcada i Reixac, se ubican las canteras de Can Rovira y de Can Donadéu. Ambas explotan el zócalo granodiorítico de la sierra de Marina.
Durante los últimos seis años hemos podido visitar, con autorización de la empresa PROMSA, la cantera de Can R...
Ladle furnace slag (LFS) has been proposed as partial cement replacement due to its similar chemical composition with Portland cement. However, its mineralogical composition needs to be considered due to problems with expansive reactions and lower cementing activity. The objective of this study is to investigate the effect of particle size and mine...
The sedimentary record of the maar lake succession at Camp dels Ninots (Pliocene, NE Spain) reflects mineralogical shifts that correlate with orbitally forced climate changes. X-ray powder diffraction was obtained from a 47 m-long core collected from a borehole drilled in the centre of the paleolake. The results show compositional variations in ter...
Rhenium disulfide (ReS2), known in nature as the mineral rheniite, is a very interesting compound owing to its remarkable fundamental properties and great potential to develop novel device applications. Here we perform density functional theory (DFT) calculations to investigate the structural properties and compression behavior of this compound and...
The Las Minas Gypsum Unit consists of more than 100 m of alternations of gypsum, carbonates and marls in Las Minas Basin (Betic Cordillera). Although this unit has been previously described as lacustrine, a marine influence in the basin has been suggested. This study provides new geochemical and paleontological data supporting the marine influence...
Fracture-filling rose-like clusters of bladed calcite crystals are found in the northern sector of the Cadí thrust sheet (SE Pyrenees). This unusual calcite crystal morphology has been characterized by using optical and electron microscope, X-ray diffraction, Raman spectroscopy, δ 18 O, δ 13 C, 87 Sr/ 86 Sr, clumped isotopes, and major and rare ear...
Ronchi et al. (in press) comment on the stratigraphic, sedimentological, mineralogical and palaeontological analyses performed in the recently described Coll de Terrers Permian–Triassic terrestrial succession from the Catalan Pyrenees by Mujal et al. (2017a). The comment debates our interpretation of a succession of red-beds as Permian (Upper Red U...
Chert from the limestones and marly limestones of Castelltallat Formation (Ebro Basin) was widely used throughout prehistoric times in north-eastern Iberia to produce stone tools due to its properties and accessibility. A rough estimate indicates that this rock -either as raw material or as lithic products- was distributed mainly to the north of th...
maar, silicification, silica, opal, hydrothermal system
The most severe biotic crisis on Earth history occurred during the Permian–Triassic (PT) transition around 252 Ma. Whereas in the marine realm such extinction event is well-constrained, in terrestrial settings it is still poorly known, mainly due to the lack of suitable complete sections. This is utterly the case along the Western Tethys region, lo...
Figure S1. The lower URU. A. Overview of the mudstones with fine-grained sandstone channels. B, C. Lateral accretions within sandstone channels. D. Small carbonate edaphic nodules. E. Vertical invertebrate burrow. F. Root trace fossils (whitish) in a medium- to coarse-grained sandstone.
Figure S2. Lower/upper URU boundary. A. Overview of the transition with three levels of nodules (white dashed lines); note the colour change between the lower and upper URU mudstones. B, C. Close view of the nodular levels (C squared in B), including septarian nodules (N) and root traces (Rt). D. Example of septarian nodules squared in C.
Figure S5. Tetrapod footprints of Morphotype I from cycle 38. A. General view of the trackway with the different manus-pes sets (RM-RP and LM-LP). B. Trackway in cross section. C. Well-preserved manus and partial pes, including 3D model and ichnites outline (as in Fig. 6B).
Figure S6. Tetrapod footprints of Morphotype II from cycle 39. A. Manus-pes set. B, C. Pes impressions.
Figure S7. Tetrapod footprints of Morphotype III from cycle 27. A-F. Footprints in surface G. H, I. Footprints from surface J. Note the different shapes of the heel (A-F, H, I) and the rough alignments of the footprints, possibly from the same trackways (G, J).
Figure S8. Slab with tetrapod footprints from Morphotype IV, close to cycle 49 (specimen IPS-99097). Squares are those of Fig. 6.
Figure S9. Invertebrate trace fossils from the upper URU. A. Abundant vertical burrows. B. Vertical burrows located in mud-cracks (arrow). C. Ramified horizontal burrow and vertical burrow (arrow). D, E. Horizontal burrows in cross section. G-J. Ichnites of notostracan arthropods (triopsids), including resting traces (Rusophycus, F-H) and locomotio...
Figure S4. Tetrapod footprints of Morphotype I. A. Manus-pes set from cycle 9. B-I. Trackway from cycle 23, with track in cross section (B), the manus-pes sets with partial overstepping of pes to manus impressions (C-H) and general view of the trackway with manus paces in white dashed line (I).
Figure S3. Element intensities obtained by XRF. Black and white circles correspond to mudstone and sandstone samples, respectively. Red lines and grey interval as in Fig. 4.
It is shown that portable X-ray fluorescence (pXRF) is a powerful tool for the identification and geochemical characterization of prospective Cretaceous–Paleogene (K–Pg) boundary sites. Field measurements in two well-known K–Pg boundary sequences, located at Agost and Caravaca, SE Spain, have been performed. A sizable enrichment around the K–Pg hor...
The Pliocene Camp dels Ninots maar volcanic lake (La Selva Basin, NE Spain) was filled with lacustrine freshwater sediments. A drilling campaign from 2015 permitted to study the lacustrine succession as well as the associated abundant silica nodules (menilitic opals). The goals of this work are: (i) to characterize the composition, mineralogy and t...
The new mineral abellaite (IMA 2014-111), ideally NaPb2(CO3)2(OH), is a supergene mineral that was found in one of the galleries of the long-disused Eureka mine, in the southern Pyrenees (Lleida province), Catalonia, Spain. Abellaite is found as sparse coatings on the surface of the primary mineralization, it forms subhedral crystals not larger tha...
Flint from Montmaneu's Limestones Formation of Rupelian age (Oligocene) is being here characterized. The analysis of the compositional texture, mineralogy and geochemical features has revealed this flint is highly
pure and of microcrystalline texture, with a significant content of moganite. This flint is product of an early diagenetic replacement o...
Chert nodule samples from three different well cores (CC, CP1 & CA) from the lacustrine infill of the Camp dels Ninot maar-diatreme (La Selva Basin) have been studied by means of X-ray diffraction, and optical and electron microscope technique. The chert nodules replace diatomites and carbonates layers, and varies in mineralogy between opal-A to op...
Técnicas de imagen de sondeo aplicadas a la identificación de intervalos chert y dolomita en sedimentos lacustres Abstract: Geophysical logging tools, particularly ultrasonic acoustic borehole image techniques, are applied on two different wells (CP1 and CP2) to identify and characterize the lacustrine interval (40m) of the Camp dels Ninots maar-di...
Sodium chloride transforms into exotic compounds such as NaCl3 or Na3Cl with compression, laser heating, and excess of Cl or Na.
The altar frontal from the church of Sant Llorenç de Morunys is a late thirteenth-century or early fourteenth-century polychrome wooden structure. At present, the altar frontal is in a precarious condition that neither allows the iconographical identification of its figures, nor its exhibition. However, a more in-depth study, together with contempo...
