The Beja Igneous Complex (BIC) is a major geological feature of the SW Iberian Variscides, extending for over 100 km along southern border Ossa-Morena Zone. formation BIC occurred during main collisional stages Variscan Orogeny. Layered Gabbroic Sequence (LGS) corresponds to most primitive member BIC, hosting various occurrences Fe-Ti(-V) oxide mineralization within olivine leucogabbros. early LGS crystallization are recorded by Soberanas troctolites (SB I) and gabbronorites II;...

The Beja Layered Gabbroic Sequence (LGS) was emplaced in the southern border of Ossa Morena Zone Portugal during Variscan orogeny climax. With an area 315 km2 it remains one largest synorogenic intrusions worldwide, being chiefly preserved from postmagmatic tectono-metamorphic events. intrusion hosts potentially economic oxide mineralization and ore showings developed at different evolution stages intrusion. It overlaps time Ni-Cu-PGE Aguablanca deposit (Spain), sharing also similarities...

The Beja Layered Gabbroic Sequence (LGS) is a large mafic layered intrusion, exposed across the southwestern border of Ossa-Morena Zone (Iberian Massif), in southern Portugal. Despite its synorogenic character, this intrusion well-preserved from post-magmatic tectono-metamorphic events. S-SW LGS was intruded by an anorthosite-trondhjemite-tonalite (ATT) suite, locally injected into NW-SE shear zones, which nature and geodynamic significance are here discussed. Dykes forming ATT suite occur...

Mineral prospectivity modelling is a geospatial technique used to predict the likelihood of discovering economically viable mineral deposits in unexplored areas. This method integrates various geoscientific data, such as geological, geophysical, geochemical, and remote sensing using simple mathematical, statistical or artificial intelligence algorithms identify regions with high potential. By expert knowledge by analysing spatial patterns correlations between known occurrences geological...

Inspirado na canção “Mestre-Sala dos Mares” (João Bosco e Aldir Blanc) esse artigo propõe a necessidade de uma leitura crítica decolonial da história oficial brasileira sua decorrente teoria direitos humanos. A partir aportes memória política, Walter Benjamin, tendo como objeto privilegiado análise permanência violência social político-estatal contra população negra no Brasil, pretende chamar atenção para os efeitos perversos construção política memória, do Direito, feitar por aqueles que...

Three of the largest granite porphyries northern Portugal were studied to improve current knowledge on regional felsic vein hypabyssal magmatism. All exhibit microcrystalline groundmasses variable granularity (composed quartz, K-feldspar, and muscovite), plagioclase, biotite, cordierite phenocrysts, antirapakivi rapakivi feldspars, embayments in enrichments rare metal incompatible elements. The veins emplaced along fractures generated during last phase Variscan orogeny. Textural features...

The Permo-Carboniferous magmatism, recorded throughout NW and SW Europe, is related to the late post-tectonic stages of Variscan orogeny constitutes an important period reorganization stress field due transition from a compressive/transpressive extensional/transtensive setting. In northern Portugal, this event manifested through presence numerous dykes, sills, masses subvolcanic lithologies such as granite porphyries, lamprophyres, dolerites. present study focused on geochronological results...

This work is a mineral chemistry study of the pyroxene crystals composing microgabbro dyke found in Vila Nova de Foz Coa (VNFC) region northern Portugal. Several geothermometers and geobarometers have also been employed to infer likeliest thermodynamic conditions crystallization. Following IMA 1988 report for nomenclature minerals, VNFC rich Ca-Mg-Fe species. The studied clinopyroxenes are aluminian, chromian, and/or ferroan diopside augite, whereas existing orthopyroxenes enstatite....

In the Central Iberian Zone, multiple subvolcanic intrusions were emplaced during final stages of Variscan orogeny. The felsic component this magmatic episode is mainly represented by dykes and masses granite porphyries microgranites, which can be commonly found in northern Portugal. Overall, these rocks are more evolved enriched rare incompatible metal elements (such as Li, Be, Rb, Cs, Nb, Ta, Sn, W) when compared to regional granites. data acquired from lithogeochemical study reported...

<p>Several hypabyssal dykes and masses, generated during the Permo-Carboniferous, outcrop throughout southwest Europe. In Portugal, this magmatic event is related to transition from a post-collisional extensional setting that followed Variscan orogeny represented by porphyries, lamprophyres, dolerites which intruded into older metasediments granites. The magnetic mineralogy, susceptibility, fabrics of selected northern Portugal were studied using methodologies such as IRM curve...

<p>The onset of the final stages Variscan orogeny in Central Iberian Zone (CIZ) is marked by emplacement several late to post-tectonic granite melts. The following transition into an extensional regime associated with subvolcanic magmatism, commonly represented veins and masses rhyolitic porphyries, dolerites, lamprophyres. In Portugal Spain, these hypabyssal lithologies are fairly abundant.</p><p>The Lamas de Olo region northern located about 100 km...