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EBSD Study of Fe-Ni phases on a L4-L5 ordinary chondrite meteorite
Almeida, B.; Seixas, T. M.; Mendes, M. H.; Ferro, M. C.; Salgueiro da Silva, M. A.; Santos, J. F.; Almeida, F.; Diogo, Z.; Lopes, A. B.; Vieira, J.The research on interplanetary materials such as comets, meteors or meteorites contributes to understand the origin and evolution of our Solar System. They provide highly valuable information on the relation between the conditions of formation and their microstructure, chemical composition and magnetic properties. Orientation relationships of the Fe-Ni system and distribution of body-centered cubic kamacite-α,...
New geochemical and isotopic constraints on the genesis of the Oliveira Azeméis...
Santos, J.; Mendes, M.H.; Gonçalves, A.; Moita, P.The Porto-Tomar Shear Zone (PTSZ) is a very important tectonic structure that separates, in central-western Portugal, two of the major tectonic units of the Iberian Variscan Chain: the Ossa-Morena Zone, to the west, and the Central Iberian Zone, to the east. The Oliveira de Azeméis area lies in the northern sector of the PTZC and it is characterized by the occurrence of strongly deformed granitoids. Country roc...
XRD, SEM and petrologic characterization of stony-iron and metallic meteorites
Seixas, T. M.; Silva, M. A. S.; Almeida, F.; Diogo, Z.; Mendes, M. H.; Santos, J. F.; Vieira, J. M.; Marques, M.Meteorites are remnants of geological processes that occurred in our Solar System. Properly analyzed, the bulk composition, mineralogy, and petrology of meteorites can be used to constrain planet formation processes. Moreover, the laboratorial characterization of meteorite samples plays an important role in the interpretation of asteroid remote observation spectra. In this work, we have characterized three mete...
New petrographic, geochemical and geochronological data for the Reguengos de Mo...
Antunes, A.; Santos, J. F.; Azevedo, M. R.; Mendes, M. H.; Ribeiro, S.The Reguengos de Monsaraz pluton is a late to post-tectonic Variscan intrusion occurring in the Ossa Morena Zone (Iberian Variscan Chain). The dominant lithological types are tonalites and granodiorites, but the internal area of the massif is composed of gabbro-dioritic rocks. Field evidence shows that the intrusion is heterogeneous at mesoscopic scale suggesting that the emplacement of mafic and felsic magmas ...
Petrology of spinel peridotite xenoliths from Santo Antão, Cape Verde Islands
Mendes, M. H.; Caldeira, Rita; Silva, L. Celestino da; Munhá, JoséOs xenólitos ultramáficos, existentes em lavas basálticas alcalinas/nefeliníticas da Ilha de Santo Antão (Cabo Verde), incluem uma série harzburgítica e uma série dunítica/wehrlítica; a série harzburgítica apresenta características texturais/mineralógicas complexas e é mais refractária (Fo = 90-92) do que a série dos dunitos/wehrlitos (Fo = 82-88). Os xenólitos duníticos e wehrlíticos são, essencialmente, ac...
Esclerose lateral amiotrófica variante distal dos membros inferiores apresentaç...
Godoy,J. M.; Skacel,M.; Balassiano,S. L.; Neves,J. R. M.; Goffredo Filho,G. S.; Castro,R. B. de; Nicaretta,D. H.; Souza,R. G. S.; Mendes,M. H. F.Os autores apresentam três casos de pacientes com esclerose lateral amiotrófica, variante de Patrikios, chamando a atenção para a importância do diagnóstico diferencial desta com as neuropatias periféricas.
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