Frederico Borges

• University of Porto

Neste livro faz-se um estudo multidisciplinar do manuscrito BPMP 1127, anónimo e não-datado, originalmente pertencente à livraria de Luís Pinto de Sousa Coutinho, que permaneceu por estudar na Biblioteca Pública Municipal do Porto durante quase dois séculos, até um dos autores do presente trabalho o ter descoberto há alguns anos. O estudo debruça-s...

Neste livro faz-se um estudo multidisciplinar do manuscrito BPMP1127, anónimo e não-datado, originalmente pertencente à livraria de Luís Pinto de Sousa Coutinho, que permaneceu por estudar na Biblioteca Pública Municipal do Porto durante quase dois séculos, até um dos autores do presente trabalho o ter descoberto há alguns anos. O estudo debruç...

Hydrogeologist EurGeol José Martins Carvalho (BSc, PhD, DSc) gave his last lecture at the School of Engineering of Polytechnic of Porto in January 2014, bringing to a formal close an outstanding career in multidisciplinary hydrogeology teaching and practice (in Europe, Africa, Middle-East, Asia, South America) and in applied research. Nowadays, he...

O distrito auri-antimonífero Dúrico- Beirão, localiza-se nas proximidades do Porto, estendendo-se por uma faixa de cerca de 90km, com orientação NW-SE que se inicia em Lagoa Negra (proximidades de Esposende) e se prolonga até próximo de Castro Daire. A maioria dos jazigos concentra-se entre Valongo e a margem sul do rio Douro. As minerali- zações o...

Mountains are often considered as the world's water towers. This paper presents a critical review on the research con-cerning the integrated assessment of groundwater resources of the mountain hydrogeologic system of Serra da Estrela Natural Park (central Portugal). The study area is the Zêzere river basin upstream of Manteigas village located at t...

High-mountain basins provide a source of valuable water resources. This paper presents hydrological models for the evaluation of water resources in the high-mountain Zêzere river basin in Serra da Estrela, Central Portugal. Models are solved with VISUAL BALAN v2.0, a code which performs daily water balances in the root zone, the unsaturated zone an...

The application of cathodoluminescence microscopy to the study of quartz from different sources aims to show the importance of this technique to distinguish different generations of quartz, and to identify geochemical signatures with different origins. This study was applied to quartz of hydrothermal origin associated with gold mineralization, with...

Understanding the role of the vadose zone is essential to accurately assess hydrogeological systems and the respective groundwater resources. The study area (Manteigas - Nave de Santo António - Torre sector, serra da Estrela Mountain, Central Portugal) presents specific geological, morphotectonical and climatic characteristics with significant infl...

Understanding the role of the vadose zone is essential to accurately assess hydrogeo- logical systems and their respective groundwater resources. The study area (Manteigas - Nave de Santo António - Torre sector, Serra da Estrela Mountain, Central Portugal), presents specific geological, morphotectonic and climatic characteristics which influence th...

The gold mineralizations of the Dúrico-Beirão mining district (North Portugal) are separated into two types: Sb-Au and Au-As , and two gold-poor types: Pb-Zn-(Ag) and W-Sn. The Au-As type deposits underwent an important litostratigraphical control by Lower Ordovician alternances along the eastern limb of the Valongo anticline. They are characterize...

In this paper, we characterize the composition and flow paths of the low-temperature geothermal waters that discharge in the Manteigas-Nave de Santo António-Torre region, situated in the mountainous terrain of Serra da Estrela (Central Portugal, Iberian Massif). Geologic, geomorphic, structural, hydrogeochemical, isotopic (18O, 2H and 3H) and clima...

Numerical models are needed to evaluate complex hydrological systems. VISUAL BALAN v2.0 is a lumped hydrological code which performs daily water balances in the soil, the unsaturated zone and the aquifer requiring a small number of parameters. VISUAL BALAN has been used to model the river Zêzere catchment upstream of Manteigas (Serra da Estrela, Ce...

Preceeding the main Hercynian Au-As-Sb metallogenic hydrothermal event, metallic preconcentrations (Au, Sb, Pb) occurred during the sedimentation of the Paleozoic, namely in the Precambrian (?) and/or Cambrian layers bearing volcanic prints, in the volcano-sedimentary lower Ordovician and in the basal Carboniferous breccia. The most evident lithost...

The results of a preliminary hydrogeological study of the river Zêzere catchment upstream of Manteigas (Serra da Estrela Natural Park, Central Portugal) are presented. In this mountain region, different types of groundwater and surface water (used in several economic activities) occur. The methodology adopted in this study emphasizes the way how Ge...

A hydrogeological conceptual model of the Caldas do Moledo geothermal site is proposed that shows mixing between geothermal waters and local shallow groundwaters. Stable isotope values of Caldas do Moledo geothermal waters indicate recharge areas located at relatively high altitudes (850–1250 m a.s.l.). The NW–SE Vigo–Régua shear zone plays an impo...

ABSTRACT The study of a garnet-bearing quartzite from a major suture zone in Iberia reports an unusual high-T fabric. Quartz c-axis patterns were plotted using shaped garnet as reference axis for the finite stretch (X-axis). The pole figures are characterized by a dominant single maximum around X together with other point maxima along the XY plane...

Pseudotachylyte is regarded as a friction melt developed during brittle faulting at depths within the crust that approximate the seismogenic zone. It is a dark, very fine-grained fault rock, which may intrude as thin veinlets the surrounding gneissic rocks. Our work aims at studying pseudotachylytes identified in three main sectors of the portugues...

The results of multidisciplinary studies concerning the Po̧co Quente thermal (T_e7≈22.9°C) spring waters, located at the Granj̃ao-Caldas do Moledo sector (Peso da Ŕegua, Northern Portugal), are presented. The hydrogeological and geotectonic studies indicate that the location of Po̧co Quente spring is mainly conditioned by the local structural geolo...

The results of studies concerning the geologic, geomorphologic, tectonic and hydrogeologic features of Caldas do Moledo (Peso da Ŕegua, Northern Portugal) hydromineral system are presented. The geological and structural study included the survey of structural discontinuities and tectonic lineaments. A major granitic outcrop was identified and mappe...

A method is described which eliminates most – if not all – spurious solutions usually obtained when indexing an electron diffraction pattern from a substance having a structure with low symmetry. The proposed method is applicable when the diffraction pattern includes non-zero Laue zones, or when crystallographic planar features are recognized in th...

Microstructural and chemical variations accompanying the mylonitisation of the Roneval anorthosites were studied. The plagioclase in the anorthosite studied has compositions of ca. An65 or of An48 if garnet is present. Huttenlocher and Boggild lamellae are present in undeformed grains of both compositions. The mylonites developed by syntectonic rec...

Some deformed aplitic veins in the Serra do Barroso and Vila Real areas of N Portugal were studied. They are rich in cassiterite and related to coarse-grained granites (Serra do Barroso) and two-mica granites (Vila Real). The deformation of the veins is related to late Hercynian activity and must be of Intra-Westphalian age. - L.A.B.

The modelling of a hydrogeological system should start with the elaboration of a conceptual model, which consists of a mental construction — expressed by ideas, words and figures — resulting from the available informa - tion at a certain moment. The definition of a conceptual model is one of the first, and most important, steps of the modelling pro...