6 documents found, page 1 of 1
Mineração nos Fundos Marinhos e Protecção Ambiental: Comentário
Barriga, Fernando J A S
Ocean-Floor Sediments as a Resource of Rare Earth Elements: An Overview of Rece...
Milinovic, Jelena; Rodrigues, Francisco J. L.; Barriga, Fernando J A S; Murton, Bramley J.The rare earth elements (REE), comprising 15 elements of the lanthanum series (La-Lu) together with yttrium (Y) and scandium (Sc), have become of particular interest because of their use, for example, in modern communications, renewable energy generation, and the electrification of transport. However, the security of supply of REE is considered to be at risk due to the limited number of sources, with dependence...
XRD Identification of Ore Minerals during Cruises: Refinement of Extraction Pro...
Milinovic, Jelena; Dias, Ágata Alveirinho; Janeiro, Ana I.; Pereira, Manuel F. C.; Martins, Sofia; Petersen, Sven; Barriga, Fernando J A SThe on-board identification of ore minerals during a cruise is often postponed until long after the cruise is over. During the M127 cruise, 21 cores with deep-seafloor sediments were recovered in the Trans-Atlantic Geotraverse (TAG) field along the Mid Atlantic Ridge (MAR). Sediments were analyzed on-board for physicochemical properties such as lightness (L*), pH and Eh. Selected samples were studied for minera...
Mineração sustentável e responsável em ambiente marinho profundo
Barriga, Fernando J A SVerifica-se presentemente um aumento acelerado da procura e consumo de recursos metálicos, muitos deles críticos, incluindo terras raras, cobalto, níquel, tungsténio, molibdénio, cobre, titânio, nióbio, platinídeos, índio, gálio, telúrio e muitos outros. A sociedade em geral mal se apercebe deste facto, alimentado pelo crescimento da população e sobretudo pelo aumento generalizado do poder de compra, e o concom...
Deep-Sea Mining: a Manageable Necessity or a Curse?
Barriga, Fernando J A SThe dependence of modern societies upon critical raw materials (nearly all metals) is overwhelming. Some believe that demand is growing faster than offer, not only because of geological availability but also for political and economic reasons. For these reasons it is imperative to consider new sources for raw materials.The seafloor stands as a likely candidate. We must create readiness now to be prepared when t...
Contact metamorphism associated to the Penamacor–Monsanto granitic intrusion (C...
Ribeiro da Costa, Isabel; Antunes, Isabel Margarida H. R.; Mourão, Cyntia; Recio, Clemente; Guimarães, Fernanda; Ramos, João FarinhaContact metamorphism related to Variscan and late-Variscan granitic plutons in the Iberian Peninsula is superimposed on medium-grade regional metamorphism, making it often difficult to evaluate per se the thermal effects due to those intrusions and explaining the paucity of scientific literature on the subject. An exhaustive set of geochemical, isotopic and mineralogical data on the contact-zone metasediments h...