Gonçalves, Antonio Olimpio; Melgarejo, Joan-Carles; Alfonso, Pura; Amores, Sandra; Paniagua, Andrés; Neto, Andrés Buta; Morais, Eduardo Alves; Camprubí, Antoni (2019) The Distribution of Rare Metals in the LCT Pegmatites from the Giraúl Field, Angola. Minerals, 9 (10). 580 doi:10.3390/min9100580
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | The Distribution of Rare Metals in the LCT Pegmatites from the Giraúl Field, Angola | ||
| Journal | Minerals | ||
| Authors | Gonçalves, Antonio Olimpio | Author | |
| Melgarejo, Joan-Carles | Author | ||
| Alfonso, Pura | Author | ||
| Amores, Sandra | Author | ||
| Paniagua, Andrés | Author | ||
| Neto, Andrés Buta | Author | ||
| Morais, Eduardo Alves | Author | ||
| Camprubí, Antoni | Author | ||
| Year | 2019 (September 24) | Volume | 9 |
| Page(s) | 580 | Issue | 10 |
| Publisher | MDPI AG | ||
| URL | |||
| Download URL | https://www.mdpi.com/2075-163X/9/10/580/pdf?version=1571645467 | ||
| DOI | doi:10.3390/min9100580Search in ResearchGate | ||
| Generate Citation Formats | |||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 7735516 | Long-form Identifier | mindat:1:5:7735516:4 |
| GUID | 0 | ||
| Full Reference | Gonçalves, Antonio Olimpio; Melgarejo, Joan-Carles; Alfonso, Pura; Amores, Sandra; Paniagua, Andrés; Neto, Andrés Buta; Morais, Eduardo Alves; Camprubí, Antoni (2019) The Distribution of Rare Metals in the LCT Pegmatites from the Giraúl Field, Angola. Minerals, 9 (10). 580 doi:10.3390/min9100580 | ||
| Plain Text | Gonçalves, Antonio Olimpio; Melgarejo, Joan-Carles; Alfonso, Pura; Amores, Sandra; Paniagua, Andrés; Neto, Andrés Buta; Morais, Eduardo Alves; Camprubí, Antoni (2019) The Distribution of Rare Metals in the LCT Pegmatites from the Giraúl Field, Angola. Minerals, 9 (10). 580 doi:10.3390/min9100580 | ||
| In | (2019, September) Minerals Vol. 9 (10) MDPI AG | ||
| Abstract/Notes | The 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. | ||
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