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Vol. X, Fasc. 3/4 (1955-1956)

Vol. X, Fasc. 3/4 (1955-1956)


Vol. X, Fasc. 3/4 (1955-1956)Categoria: Publicações, Estudos, Notas e Trabalhos, 1950 a 1959

15.90

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Descrição

Artigos

1. A Ferraria da Foz de Alge – Período de Joaquim Pedro Fragoso da Mota Sequeira (1829-1833).
J. Silva Carvalho (54 páginas)
Resumo: In this article, which is the continuation of three others already published, the author deals with the main facts which occurred between June 1829 and March 1833 at the Foz de Alge iron factory where pig iron was manufactured from iron ores of that region. During this period with which we are dealing, the manager of the Portuguese mines was Intendent Joaquim Pedro Fragoso da Mota Sequeira who tried his hardest to find means to support this unprotected industry. It was with great sacrifices that he was able to get two foundrys running: one in 1830 and another in 1832.The government could see no use for the existence of the iron factory of Foz de Alge as its products were saleable. The factory ran the risk to being closed down. The civil war, however, which mercilessly divided the Portuguese Nation, maintained its life as it contributed with bullets for the governmental artillery.

2. Estudo Espectrográfico de Cinzas de Antracites Portuguesas.
A. Carlos de Brito (15 páginas)
Resumo: In this work 101 ashes of Portuguese were analysed spectrographically. They were incinerated at 550° C and the spectra were obtained with a Littrow quartz spectrograph. Forty elements were investigated, having been found 26 and detemined semi-quantitatively 23. Sixteen of the 26 elements found were present in all the antracites and the other 10 only in some of them.

3. Estudo Espectrográfico de Cinzas de Lignites Portuguesas.
A. Carlos de Brito (12 páginas)
Resumo: In this work 64 ashes Portuguese lignites were analysed spectrographically. Samples were taken from the top, the bottom and the middle of several seams. The temperature of incineration was 550° C., and the spectra were obtained with a Littrow quartz spectrograph.Forty elements were looked for, of which 26 were detected and 22 determined semi-quantitatively. Sixteen of the detected elements were found in all ashes and the other 10 in some of them only. Germanium was found in 24 ashes, its percentage varying between 0,1% and 0,01% in 6 samples, and 0,001% in the other 18.

4. Estudo Geológico-mineiro da Região de Rates.
A. Cândido de Medeiros (13 páginas)
Resumo: La présente étude comprend la reconnaissance géologique de la région de Rates et insiste, surtout, sur les formations en rapport avec la présence des mineraux limonitiques qui ont donné lieu à quelques exploitations. Outre la carte géologique à l’échelle de 1:25 000 qui couvre toute la région de Rates-Laundos, nous joignons 3 coupes géologiques qui rendent plus compréhensible la structure del’aire étudiée.Les concentrations ferrifères qui constituent le «gisement de Rates», se trouvent sur le versant Est de la montagne du même nom, sur les territoires des «concellhos» de Póvoa do Vazim et de Vila do Conde. La Serra de Rates, de forme allongée, est constituée par une série de collines alignées qui se dressent au dessus de la grande plaine littorale; la plus haute de ces collines est le mont de S. Félix (202 m).
Ces reliefs correspondent à une étroite bande de quartzites du Silurien, qui se trouve dans le prolongement de celle de Valongo et qui s’étend depuis les rives du Rio d’Este, jusqu’à Apulia et Fão, où elle pénètre dans la mer. Sur le littoral les quartzites ont été nivelés par l’abrasion marine plio-pleistocène. Outre le Silurien et le Dévonien, la région possède encore des affleurements du complexe schistes-grauwackien anté-silurien, du carbonifère (westfhalien), des granites et des formations de couverture.
Les concentrations ferrifères qui forment le gisement de Rates, aparaissent, surtout, en rapport avec les formations gréseuses de la bande du Dévonien inférieur (Gédinien). Il s’agit de petites masses limonitiques d’origine supergénique, qui sont le résultat de la migration vers la surface des composés de fer existant dans les schistes dévoniens et grâce au movement des eaux d’infiltration, dû à des conditions climatiques spéciales, pendant le Pliocène supérieur et pendant le Quaternaire.
Au point de vue économique, ce gisement, n’a, dans son état actuel, aucune valeur, car les principales masses limonitiques ont été totalement exploitées.

5. Relatório do Serviço de Fomento Mineiro do Ano de 1954.
J. L. Guimarães dos Santos (64 páginas)


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