000086475 001__ 86475
000086475 005__ 20201022135734.0
000086475 0247_ $$2doi$$a10.3390/min9100580
000086475 0248_ $$2sideral$$a115279
000086475 037__ $$aART-2019-115279
000086475 041__ $$aeng
000086475 100__ $$aGonçalves, Antonio O.
000086475 245__ $$aThe distribution of rare metals in the LCT pegmatites from the Giraúl Field, Angola
000086475 260__ $$c2019
000086475 5060_ $$aAccess copy available to the general public$$fUnrestricted
000086475 5203_ $$aThe Giraúl granitic pegmatite field in Angola is composed of five pegmatite types, the most evolved belong to the beryl-columbite, beryl-columbite-phosphate and spodumene types. Pegmatites are concentrically zoned with increased grain size toward a quartz core; the most evolved pegmatites have well-developed replacement units. These pegmatites are rich in Nb-Ta oxide minerals and the field has a moderate interest for critical elements such as Ta and Hf. Tourmaline, garnet and micas occur as accessory minerals. The abundance of Zr and Nb-Ta minerals increases with the evolution of the pegmatites, as well as the proportions of beryl and Li-rich minerals. The Ta/(Ta + Nb) ratio in Nb-Ta oxide minerals and the Hf/(Hf + Zr) ratio in zircon also increase with the evolution of the pegmatites and within each pegmatite body from border to inner zones, and especially in the late veins and subsolidus replacements. Textural patterns and occurrence of late veins with Ta-rich minerals suggest that Nb and especially Ta can be enriched in late hydrothermal fluids exsolved from the magma, along with Hf and other incompatible elements as Sn, U, Pb, Sb and Bi.
000086475 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000086475 590__ $$a2.38$$b2019
000086475 591__ $$aMINING & MINERAL PROCESSING$$b6 / 21 = 0.286$$c2019$$dQ2$$eT1
000086475 591__ $$aMINERALOGY$$b11 / 30 = 0.367$$c2019$$dQ2$$eT2
000086475 592__ $$a0.494$$b2019
000086475 593__ $$aGeotechnical Engineering and Engineering Geology$$c2019$$dQ2
000086475 593__ $$aGeology$$c2019$$dQ2
000086475 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000086475 700__ $$aMelgarejo, Joan-Carles
000086475 700__ $$aAlfonso, Pura
000086475 700__ $$aAmores, Sandra
000086475 700__ $$aPaniagua, Andrés
000086475 700__ $$aButa Neto, Andrés
000086475 700__ $$aAlves Morais, Eduardo
000086475 700__ $$aCamprubí, Antoni
000086475 773__ $$g9, 10 (2019), 580 [37 pp.]$$pMinerals (Basel)$$tMinerals$$x2075-163X
000086475 8564_ $$s18107104$$uhttps://zaguan.unizar.es/record/86475/files/texto_completo.pdf$$yVersión publicada
000086475 8564_ $$s106507$$uhttps://zaguan.unizar.es/record/86475/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000086475 909CO $$ooai:zaguan.unizar.es:86475$$particulos$$pdriver
000086475 951__ $$a2020-10-22-13:50:24
000086475 980__ $$aARTICLE