24 documents found, page 1 of 3

Strain partitioning in transpression; a major feature in the evolution of the I...

As the wavy pattern of fold belts is a common feature, since its recognition, the transpressive regimes were expected to be a pervasive mechanism on their evolution. Nevertheless, even in regions where oblique shortening is inferred, typical structures of transpression (e.g. transected cleavage and en echelon folds, shear or veins) are often absent. Instead, what is frequently observed is the juxtaposition of n...

Evaluation of pXRF as an exploration tool in soil analysis to detect antimony m...

ABSTRACT: A portable X-ray fluorescence (pXRF) is a tool that enables qualitative and semi-quantitative elemental analysis in real-time. In this study, the accuracy of the method for the quantitative analysis of antimony in the ancient mining areas of Ribeiro da Serra and Tapada was evaluated using soil samples. The obtained results were favourable regarding the ability to identify and quantify antimony (Sb) in...

M13 phage grafted with peptide motifs as a tool to detect amyloid- oligomers in...

Oligomeric clusters of amyloid- (A) are one of the major biomarkers for Alzheimers disease (AD). However, proficient methods to detect A-oligomers in brain tissue are lacking. Here we show that synthetic M13 bacteriophages displaying A-derived peptides on their surface preferentially interact with A-oligomers. When exposed to brain tissue isolated from APP/PS1-transgenic mice, these bacteriophages detect small-...

Later prehistoric tin mining in the Ervedosa mine (Vinhais, Portugal): evidence...

This paper presents a comprehensive study of the evidence for ancient tin mining at the Ervedosa mine (Vinhais, Portugal). The geological context of the site indicates a rich cassiterite (SnO2) deposit, which was subject to mining in the twentieth century. Some ancient mining and ore processing stone tools were recovered during the twentieth century mining operations, namely one hammer, one pounder, one flat an...

Aplicação de cartografia LiDAR aéreo no controlo estrutural de filões aplitopeg...

The Alvão region in northern Portugal hosts a significant field of aplite-pegmatite dykes enriched in lithium, tin, niobium, and tantalum. These aplite-pegmatite dykes from the Alvão region are emplaced within the parautochthonous succession of the Galicia-Trás-os-Montes Zone, deformed during the Variscan orogeny. Throughout the deformation process, a series of developed structures may have served as preferenti...

Lithium: a crucial non-toxic metal for the energy transition

Lithium is a strategic metal globally. The expanding market for lithium (Li) batteries, utilized in a diverse range of products from electric vehicles and renewable energy storage and backup to smartphones and laptops, is driving a growing demand for lithium, amplifying the risk of supply shortages and surging prices. With the ongoing energy transition, advanced geological exploration technologies are essential...

Segurança energética

Spectral library of European pegmatites, pegmatite minerals and pegmatite host-...

The New Exploration Tools for European Pegmatite Green-Tech Resources (GREENPEG) spectral database contains the spectral signature, obtained through reflectance spectroscopy studies, of European pegmatites and minerals as well as their host rocks. Samples include pegmatites of the Nb–Y–F (NYF) and Li–Cs–Ta (LCT) chemical types and host rocks from pegmatite locations in Austria, Ireland, Norway, Portugal, and Sp...

The INOVMineral project’s contribution to mineral exploration - a WebGIS integr...

Due to the current energetic transition, new geological exploration technologies are needed to discover mineral deposits containing critical materials such as lithium (Li). The vast majority of European Li deposits are related to Li–Cs–Ta (LCT) pegmatites. A review of the literature indicates that conventional exploration campaigns are dominated by geochemical surveys and related exploration tools. However, oth...

A LCT pegmatite spectral library of the aldeia spodumene deposit: contributes t...

Several methodologies can be employed in the prospection of Lithium (Li) in hard-rock (pegmatites). Spectrometry analysis, a Remote Sensing (RS) technique, can be applied to understand the surface spectral response of a sample, both to identify the rock-forming or alteration minerals in its composition and to validate the data collected in situ (by sensors onboard satellites/drones, for example). This paper aim...